LabVIEW Virtual Instrument Research Articles

Development and Validation of RoboCap, a Robotic Capillary Platform to Automate Capillary Electrophoresis Mass Spectrometry En Route to High-Throughput Single-Cell Proteomics.

Current developments in single-cell mass spectrometry (MS) aim to deepen proteome coverage while enhancing analytical speed to study entire cell populations, one cell at a time. Custom-built microanalytical capillary electrophoresis (μCE) played a critical role in the foundation of discovery single-cell MS proteomics. However, requirements for manual operation, substantial expertise, and low measurement throughput have so far hindered μCE-based single-cell studies on large numbers of cells. Here, we design and construct a robotic capillary (RoboCap) platform that grants single-cell CE-MS with automation for proteomes limited to less than ∼100 nL. RoboCap remotely controls precision actuators to translate the sample to the fused silica separation capillary, using vials in this work. The platform is hermetically enclosed and actively pressurized to inject ∼1-250 nL of the sample into a CE separation capillary, with errors below ∼5% relative standard deviation (RSD). The platform and supporting equipment were operated and monitored remotely on a custom-written Virtual Instrument (LabView). Detection performance was validated empirically on ∼5-250 nL portions of the HeLa proteome digest using a trapped ion mobility mass spectrometer (timsTOF PRO). RoboCap improved CE-ESI sample utilization to ∼20% from ∼3% on the manual μCE, the closest reference technology. Proof-of-principle experiments found proteome identification and quantification to robustly return ∼1,800 proteins (∼13% RSD) from ∼20 ng of the HeLa proteome digest on this earlier-generation detector. RoboCap automates CE-MS for limited sample amounts, paving the way to electrophoresis-based high-throughput single-cell proteomics.

ПРОЕКТИРОВАНИЕ И РАСЧЕТ ИНФОРМАЦИОННО-ИЗМЕРИТЕЛЬНОГО КОМПЛЕКСА НА БАЗЕ LabVIEW

The article deals with the problem of developing a set of devices designed for continuous collection of measurement information, its visualization and archiving based on LabVIEW. In the course of the work, an analysis of the conditions in which the developed system is used was carried out. Possible adverse factors affecting the health of the working personnel working with the created device are considered, and ways of their limitation and exclusion are proposed. The system will operate in an infinite loop mode until the execution of the LabVIEW virtual instrument program is forcibly stopped. Both a full stop and a temporary suspension of the system is possible. The paper examines the principles of building such systems, selects the scope of the device and justifies the means of solving the technical tasks. A prototype of the device has been created.

Intelligent Mechatronics in the Measurement, Identification, and Control of Water Level Systems: A Review and Experiment

In this paper, a unique overview of intelligent machines and mathematical methods designed and developed to measure and to control the water level in industrial or laboratory setups of coupled and cascaded configurations of tanks is made. A systematized and concise overview is made of the mechatronic systems used in the measurement, identification, and control of the water level enumerates, the software used in the associated scientific research, modern techniques and sensors, and mathematical models, as well as analysis and control strategies. The broad overview of applications of the last decade is finalized by a proposition of a control system that is based on a parameter estimation of a new experimental setup, an integral dynamic model of the system, a modern mechatronic machine such as the Watson-Marlow peristaltic pump, the Anderson Negele sensor of level, the NI cRIO-9074 controller, and LabVIEW virtual instrumentation. The results of real experimental tests, exploiting a hybrid proportional control, being improved by a numerically predicted water level, are obtained using a few tools, i.e., the static characteristics, the classical step response, and a new pyramid-shaped step function of a discontinuous path-following reference input, being introduced to evaluate the effectiveness and robustness of the regulation of the level height.

Motion Velocity Detection of Circuit Breaker Operating Mechanism

The movement speed of the operating mechanism is one of the main factors affecting the breaking performance of the circuit breaker. To accurately detect the movement speed, this paper proposes an image processing method based on LabVIEW virtual instrument and designs a set of software and hardware systems for real-time movement speed detection of the operating mechanism. On the basis of the movement images of the operating mechanism collected by the high-speed camera, it uses the image processing module in LabVIEW to pre-process the images. The paper adopts the Laplacian edge detection operators to detect the edges and extract the edge feature information for straight line fitting and data processing. The experimental results show that the detection system can effectively detect the motion state of the operating mechanism, realize the real-time detection of the motion state of the operating mechanism, and provide technical support for the detection of the motion characteristics of the circuit breaker.

Real-time fuzzy-pid synchronization of memristor-based chaotic circuit using graphical coded algorithm in secure communication applications

The main goal of this study is to implement real-time synchronization of a memristor-based chaotic circuit for secure communication on LabVIEW virtual instrument environments. Memristors can be used in chaotic circuits because of their nonlinear behavior. In this paper, an application for secure communication systems is proposed by using the chaotic property of the memristor. Phase portraits, Lyapunov exponential spectrum, and bifurcation diagrams of the memristor-based chaotic circuit were investigated. A Fuzzy-PID controller was used for master-slave synchronization of memristive chaotic circuit and in secure communication application, three images were also used for encryption and decryption. NI 6251 DAQ card was used to obtain real-time results. Information entropy values, correlation coefficients (CC), peak signal to noise ratio (PSNR), structural similarity index (SSIM), correlation coefficients for the horizontal, vertical and diagonal directions from the three encrypted images, number of pixels change rate (NPCR) and unified average changing intensity (UACI) are calculated to test encryption/decryption performance in the designed system. The results obtained from real-time applications and simulations prove that memristor-based chaotic circuits can be used in secure communication systems where privacy is important.

Real-time Acquisition and Analysis Test Data of Commercial Vehicle Handling Stability Based on LABVIEW Virtual Instrument

Aiming at the problems of complex time-consuming and heavy data processing workload in the field test of commercial vehicle handling stability, a vehicle handling stability test solution based on virtual instrument technology is proposed. This solution is based on the existing test equipment and conditions, using LABVIEW virtual instrument, integrated application of GPS, AHRS and steering force angle tester to form a set of road test system solutions that can realize vehicle handling and stability. The system can meet the requirements of the national standard Controllability and Stability Test Procedure for Automobile (GB / T 6323-2014) to realize the vehicle handling stability test, and the system test is verified by the real vehicle test data, which provides a more efficient and convenient test method for the study of vehicle handling stability test.

Power Sharing Control in a Grid-Tied DC Microgrid: Controller Hardware in the Loop Validation

This article presents the development of a low-cost control hardware in the loop platform for the validation and analysis of controllers used for the management of power sharing between the main grid and a DC microgrid. The platform is made up of two parts: a main grid interconnection system emulator (MGISE) and a controller under test (CUT). The MGISE operates on a 260 V DC bus and includes a 1000 W photovoltaic array, a DC variable load and a single H full bridge converter (HFBC). The CUT includes a phase locked loop and a main cascade control structure composed of two PI controllers. Both the MGISE and the CUT were embedded on an NI myRIO-1900 development board and programmed using LabVIEW virtual instrumentation software. These devices communicate with each other using analog signals representing the AC side current, the DC side voltage, and the HFBC control signal. The MGISE operates with an integration time of 6 µs and its performance is validated by comparing it with a simulation in PSIM. The integration time of the MGISE, the development boards used, as well as its programming environment, and the results obtained from the comparison with PSIM simulation, show that the proposed platform is useful for the validation of controllers for power sharing, with a simple implementation process compared to other hardware description methods and with a low-cost platform.

Versatile semi-batch apparatus for manometric measurement of gas-solid reaction rates.

We describe the design, construction, operation, and performance of a simple and versatile semi-batch reactor that is especially useful for measurement of gas/solid reaction rates at pressures in the range of 1mTorr to 1500 Torr. The reactor operates by repeatedly imposing small AC modulations of reactant gas pressure on top of a much larger DC pressure background. Based on the rate of pressure relaxation following each AC pulse, the reaction rate is determined. Our designis characterized by modular construction from off-the-shelf, ultra-high-vacuum-compatible components, which facilitate easy retrofitting and adaptation to a range of experimental conditions. Automated experiment control and data acquisition is accomplished via a custom National Instruments© LabView virtual instrument. Data analysis is automated using a custom series of Mathworks© Matlab scripts. We demonstrate reactor performance through measurements of hydrogenation kinetics for a composite H2 getter material consisting of 1,4-bis(phenylethynyl)benzene mixed with a palladium/carbon catalyst.

A novel 3D video oculography system for measuring cross-axis vestibulo-ocular reflex

We present a video oculography (VOG) system with 6-degree-of-freedom (6-DOF) mobility for real-time measurements of the binocular 3D eye position of a small animal. A hybrid hexapod that allowed for multi-axis complex motions with the resolution of the microscopic level was used to control the motion of the animal. The instantaneous eyeball movement of the animal was determined based on two approaches: (1) tracking of marker arrays affixed to the cornea; and (2) tracking the pupil outline. The tracking of the eyeball movement and the motion control of the hexapod were implemented with the LabVIEW virtual instruments. Compared with our previous measurements using a servo-motor-based single-axis VOG system, positional error reduced from more than 4% to less than 0.7%. Validation showed that the tracking errors in three rotational axes are less than 2% for the magnitude and less than 5° for the direction angle. The present VOG system is an effective tool for cross-axis 3D vestibulo-ocular reflex study on small animals.

Study on the Laser Beam Polarization Based on LabVIEW

With the wide application of laser technology in laser processing and photoelectric detection, the measurement and display of the laser beam polarization has become an extremely important prerequisite. In this paper, we realize the laser polarization measurement tool based on the virtual instrument LabVIEW software platform. The set-up is designated to measure the Stokes parameters for an arbitrarily polarized beam, using the rotating waveplate method provided by the stepper motor, drive circuit, photodetector, and computer processing of the digitized electrical signal in the PCI expansion card. The Poincare sphere is used for the interpretation of the state of polarization (SOP) and degree of polarization (DOP). The working wavelength range is declared to be 400 – 1100 nm, the accuracy of DOP, azimuth measurement, and ellipticity are ±2%, 0.4°, and 0.4°, respectively.

Bedsore and strategies for preventing and treating the bedsore

The best recognized and also the most widespread example of tissue necrosis is bedsore. A bedsore is localized damage to the skin and other underlying tissue, usually over a bony prominence, as a result of prolonged, unrelieved pressure. The cause of bedsore is shearing forces; friction, moisture, and constant pressure contribute to the development of bedsore. Hospital research shows that bedsores develop from 3% to 4.5% of patients during prolonged hospitalization and Sores develop from 25% to 85% of patients with spinal cord injury. The doctor and nurses will regularly examine the patient who is at risk of developing bedsore and inspect each pressure sites at least twice a day. Doctors and nurses are important warriors who manage bedsore treatment effectively. This review describes the new strategies have been used to prevent and management of bedsore such as inexpensive foam devices, anti-pressure devices, air-filled equipment, a sheet of hydrogels, wound vacuum-assisted closer, skin bioprinting, and Lab VIEW virtual instrument.

LabVIEW virtual instrument for zone penetration studies in flow-based analytical systems

In the flow method development, zone penetration studies are usually conducted as a part of the initial screening phase. A lack of an appropriate tool can keep these studies on the level of rough estimations. The developed LabVIEW virtual instrument (VI) which processes peak signals and calculates the overlapping area and fundamental peak-related parameters was used for the calculations in experiments that are modelling sample and reagent plug interaction within liquid conduits. The reliability of the predictions was initially confirmed on the artificial data set based on thirty-six files covering all the different types of cases that can be foreseen. To continue, the volumes of model solutions, propelling flow rate, and the coil length in the sequential injection analysis system, were varied by following the Box?Behnken response surface design. In three examples, it is demonstrated how the VI can help the planning of further experiments in the range which ensures the efficient zone overlapping, the economic exploitation of reagent plug and the adequate dispersion. The application of the VI is not limited just to the flow-based chemistry, it can also be used in spectroscopy and chromatography. In order to use the graphical user interface, it is not necessary to have the LabVIEW program installed.

Real time exploited BLDC motor drive BLDC motor drive in lab view virtual instrumentation environment

Abstract The brushless dc motor motors (BLDCMs) have an exceptional increasing demand in low powered electrical vehicle and commercial applications as their speed-torque performance, size and cost matters quite improvise than other motors. However the control of BLDCM motor is quiet complex and fitting of it into the application is very specific and challenging. The multi-motoring interface and control system and on-line turning are other challenges in the multi-motor drives as many control parameters are involved. In industrial applications, the demand of single-phase BLDCM multi-motoring real time control is expected technology in industry 4.0 based new era. The data acquisition card (DAQ), control and measurements are the ideal requirements of the real time multi-motor controls. The Lab View based centralized DAQ speed control is a possible solution for multi motor drive. With this interest, this paper deals about the real time single-phase BLDCM control by the use of Lab View DAQ NI USB 6008. In this paper the BLDCM control is created in the LABVIEW simulation with the option of varying the DC motor input voltage controlled by means of a virtual knob in lab view software. Output of DAQ has voltage varying reference which the voltage is giving the control reference voltage to the BLDCM to match the speed requirement. The current measurement of the proposed motor control has done with dedicated current shunt which accurate measures the current rating and given to DAQ. The different operating conditions of the motor performance is simulated in real time and verified with motor drive outputs. The proposed Lab VIEW based low power BLDCM control can be extended for multi-BLDCM drive system which offers the flexibility of integration of data acquisition.

Remote laboratory trends for Distance Vocational Education and Training (D-VET): A real-time lighting application

This research presents a web-based lighting laboratory infrastructure that allows students to access and control application tools in lighting technology education through online real-time equipment. Designed for Distance Vocational Training and Education, this system uses the LabVIEW Virtual Instrumentation Program to control lighting levels. In this program, the interface developed allows students to control and monitor applications online using cameras, sensors, and controllers. In the modeled system, the lighting levels of LED lamps are controlled through PID controllers. Furthermore, a web page was designed that provides synchronized (simultaneous) access to application instrumentation for the students. Each user can run applications in a specific period through this website. Students can also monitor the lighting level of the laboratory in real-time with a webcam. Individual storage of the data obtained in the model also supports conducting necessary analyses. Students can strengthen their theoretical knowledge by running lighting technique experiment applications with real equipment in the Distance Vocational Training and Education. In the evaluation part of the research, the answers are given by the students (95%) also stated that they increased the theoretical knowledge of doing remote experiments. In total 98.5% of students believe that the ability to repeat experiments anywhere in this system will accelerate the learning process.

Neutrosophic Theory Applied in the Multi Objectives Optimization of the Robot’s Joints Accelerations with the Virtual LabVIEW Instrumentation

Neutrosophic Theory Applied in the Multi Objectives Optimization of the Robot’s Joints Accelerations with the Virtual LabVIEW Instrumentation

Investigation of Photovoltaic System Parameters Using LabView in Solar Irradiance Peak Condition

The monitoring of electrical and system parameters such as current, voltage, power, intensity of light, battery, and load in photovoltaic panel is shown in this paper. The system was monitored using LabView Virtual Instrument and NI-DAQ 6008 hardware which are both developed by National Instrument. The parameters of photovoltaic was monitored under solar irradiance peak condition in local area. The system of photovoltaic panel with using monocrystalline and polycrystalline material, each PV have 50 Wp maximal output which is installed as parallel. The PV system is using battery charge regulator to reduce and control the over voltage to the battery. The analysist of the monitoring result is very useful to optimize the parameters and the efficiency of the system. Moreover, it could check the charge controller performance to reduce the over cost which is known as environmental protection. This project will be useful for continuos real time monitoring of solar power plant.

LabVIEW-Based Automated Setup for Interferometric Refractive Index Probing.

In the paper, we explain an automated LabVIEW-controlled setup that enables interferometric measurement of refractive indices in crystalline materials using a laser light source. The setup combines a mechanical system, a microcomputer-controlled gearless drive, a Michelson interferometer, an optical detector, a data acquisition system, and a LabVIEW virtual instrument for an accurate nondestructive determination of the refractive index of given plane-parallel samples. We explain the concept, implementation, and hardware/software peculiarities of the developed system. Test experiments on different crystals yielded results that are in good agreement with available reference data. The range of potential applications of the proposed setup extends from fundamental optical research to biophotonics instrumentation, where efficient delivery of light is of crucial importance and reliable automated probing tools are needed for optical component characterization.

Design of seed respiration measurement system using virtual instrument

In the seed breathing CO2 detection system, the traditional method cannot measure the concentration of CO2 in the seed breathing in real time. According to the characteristics of seed breathing CO2, a seed breathing detection system based on virtual instrument LabVIEW is designed based on tunable diode laser absorption spectroscopy (TDLAS). The system mainly includes laser light source and its controller, seed breathing container based on multiple reflecting pool structure. The upper computer software is mainly set with data acquisition, signal processing, concentration inversion and other functional modules, in which the concentration inversion uses the orthogonal vector phase-locked amplification algorithm to avoid the error caused by the phase difference between the reference signal and the signal to be measured. The experimental results show that the CO2 detection system for seed respiration implemented by virtual instrument software can effectively detect the change of seed respiration, and has good anti-interference and stability, which lays a foundation for the subsequent experimental research and development.

A Study on Developing Cardiac Signals Recording Framework (CARDIF) Using a Reconfigurable Real-Time Embedded Processor

Due to recent developments in technology, there is a significant growth in healthcare monitoring systems. The most widely monitored human physiological parameters is electrocardiogram (ECG) which is useful for inferring the physiological state of humans. Most of the existing multi-channel ECG acquisition systems were not accessible in resource-constrained settings. This research study proposes a cardiac signal recording framework (CARDIF) using a reconfigurable input-output real-time embedded processor by employing a virtual instrumentation platform. The signal acquisition was configured using Lab VIEW virtual instrumentation block sets. A graphical user interface (GUI) was developed for real-time data acquisition and visualization. The time domain heart rate variability (HRV) statistics were calculated using CARDIF, and the same were compared with a clinical grade 12-channel ECG system. The quality of the acquired signals obtained from the proposed and standard systems was measured and compared by calculating signal-to-noise ratio (SNR). The proposed CARDIF was evaluated qualitatively by visual inspection by a clinician and quantitatively by fidelity measures and vital parameters estimation. The results are quite promising and can be extended for clinical validations.

Vacuum Switch Contact Position Detection Based on Labview

Arc shape of vacuum switch is one of the main influencing factors of the breaking performance of vacuum switch. The contact opening distance directly affects the development of arc shape. How to accurately detect the real-time position of the contact and calculate the contact distance is of great significance. Therefore, based on Labview virtual instrument technology, a software and hardware system for real-time position detection of contacts for vacuum interrupter is designed. The system collects the arc image during the vacuum switch opening process by high-speed camera, and then uses the virtual instrument development platform Labview as the programming software to process the arc image and analyze the edge features. Finally, the edge information detected is used for fitting, to realize pinpoint of the moving and static contacts. The experimental results show that the detection system can accurately detect the real-time position of the contact. It has the characteristics of high detection efficiency, stable operation and easy operation. The detection results provide technical support for analyzing the vacuum switch arc shape.