Design of a Shearing Interferometry Measurement System Based on OCT and Grating Alignment

A rapid thermal processing system is described incorporating features that enable in situ optical measurements. In particular, a system incorporating an in situ spectroscopic ellipsometer is described highlighting some of the unusual features necessary for ellipsometry measurements. These features include independent optical, vacuum, and heating modules, optical and heating window design, reflector design, and sample manipulation to enable proper positioning for measurement. Although specifically designed with ellipsometry in mind, many of the same principles used in the design of this system will apply to systems for other optical measurements.

The authors report on the design of a system which will enable real time measurements of (therapeutic) drug concentrations in the anterior chamber of the eye. Currently the concentration of therapeutic drugs in the anterior chamber is determined by analyzing samples which have been removed from the aqueous humor of laboratory animal eyes. This sampling via paracentesis can be painful and does not provide a continuous measurement. Our system will be far less invasive, removing the need for sampling via paracentesis, and also providing a continuous measurement, enabling a more complete understanding of the kinetics of ophthalmic drugs. A key component in our novel system is a specially constructed contact lens. We report on the design, optimization and manufacture of such a contact lens system capable of directing UV/VIS light in, across and out of the anterior chamber of the eye, thereby enabling absorption spectroscopy measurements of the aqueous humor to be undertaken. Design of the one piece contact lens/mirror system was achieved using the Zemax optical design software package and the lens was fabricated from synthetic fused silica. Results from modeling of the lens and experimental measurements on light propagation across the anterior chamber of animal eyes assisted by the lens will be reported.

The spray is one of the important processes in the metal smelting industry that uses die casting machines to make aluminium products. This spraying process serves to prevent the problem of stamps (products attached to the dies/mold) due to overheating (overheating) on ​​the surface of the dies. The main device in this spraying process is the nozzle that is driven by a coil from the solenoid valve. To maintain the quality of the output spray to remain standard, routine maintenance is carried out manually by two operators. Operator one is outside the machine area to see the digital flow sensor display and the second operator is inside the machine area to operate the solenoid valve nozzle spray. Communication between operators plays an important role when carrying out the process of flow spray measurement. This treatment takes 7 hours. The problems found are the lack of security for operators inside the engine area due to the potential for accidents, inaccurate measurements because there is always a pause when communicating between operators inside and outside the engine area and inefficient maintenance time. The purpose of this study is to make a flow nozzle spray measurement system that is safe, accurate, and efficient. This research method uses literature and descriptive methods. The design of this system is done by creating a new display that contains a measurement menu and a record of flow spray measurement data through a Human Machine Interface (HMI) device in the form of an NS-8 Series Omron touch screen that is integrated with a Q-Series Programmable Logic Controller (PLC) type device. Mitsubishi as a controller. From the results of this study, it can be concluded that the flow nozzle spray measurement system display is safer and displays accurate and efficient measurement results because the measurement process is carried out automatically and is operated by one operator outside the machine area.

Aiming at the special conditions that it is very difficult to measure precisely and continuously by the traditional level measurement. This paper designed the linear frequency modulation continuous wave radar level measurement system base on SOPC. The paper introduced the overall design of the system, and elaborated on the function of hardware and software implementation of SOPC system . T Keywords-Level measurement, SOPC, Linear Frequency Modulated Continuous Wave Rada I. INTRODUCTION In the smelting and chemical production processes we often encounter in a large number of solid and liquid materials. Level is a very important process parameter. Through the accurate measurement of the material level, the operator can take response measures on the production based on changes of material level. In the complex modern technology production process, especially in the dicky measurement conditions such as the mixing tank, high temperature, large steam, corrosive medium, easy scarring, and the operator is far away from the scene, the real-time accurate measurement of the material level is particularly important for the optimal control and the safety of the production process. It can become the key to automatic production of the enterprises(1). Linear frequency modulation continuous wave (LFMW) radar measures the distance through modulating the continuous wave emitted and using the frequency and the phase of the echo information.It is a more advanced level measurement method because of the prominent advantages such as high accuracy, free from environmental restrictions. The current study just emerged in the field of level measurement at home and abroad, it will has a broad application prospects(2). II. OVERALL SYSTEM DESIGN The radar level measurement system includes two parts:data acquisition and SOPC system . Data acquisition is using the antenna of radar to transmit and receive the echoe of the material level. It exports mixing frequency signal through the integrate front part of radar. After pretreating it forms digital signal through A / D converter. And it controls the linearity of VCO by using the correction of the sawtooth wave voltage signal exported through the A / D converter. SOPC system includes 3 parts: FPGA, memory, and the external interface. FPGA is built on the FPGA chip, and the core is the Nios processor . The design uses the chip EP1C12Q240C8 of series Cyclone. In FPGA, the A / D and D / A conversion and control modules are achieved by writing VHDL program; DSP module is designed by DSP Builder in Matlab; the remaining parts are designed in the SOPC Builder(3). According to the functions and the determined programs of system, the overall structure of system is shown in figure 1:

The paper describes a control and measurement system for controlling and analysing operation of a stepper motor. The system design is based on the concept of virtual instrument, where data acquisition and transmission use standard solutions, whereas software serves both as a generator and a measurement system – an oscilloscope. The generator allows efficient control of motor operation in the following control modes: wave, full-step and half-step control. There were no winding powering sequence errors observed. The measurement system allows presenting and analysing voltage waveforms in individual windings with possibility to detect couplings and overvoltages. It was also shown that it is possible to detect locking of rotor rotation.The proposed virtual instruments have open structure, which enables extended analysis based on available measurements or expand range of measurements as long as measurement and control system instrumentation allows that.

Parametric analysis and of system design is the basic issue of torsion thrust measurement system. Based on parametric analysis of thruster size, weight and maximum thrust, as well as torsion damping ratio, vibration frequency and the torsional stiffness coefficient, the thesis proposes a method for parametric analysis and system design. Due to consideration of the key issues of thruster parameters, system parameter calibration and measurement time, the method proposed in this thesis is a practical method for engineering analysis and design and provides the basis for torsion system analysis and design.

As part of the requirements in a junior-level measurements & instrumentation course (for an Electrical and Computer Engineering Technology program), students are required to complete an end-of-semester team design project. One possible project is the design and implementation of an automated test & measurement system for a power supply and control board (PSCB). For this project, students design and build the PSCB to meet these requirements: one DC output voltage, one function generator output with user selectable waveform type (sinusoidal, triangular, square waveform) and user selectable amplitude and frequency adjustments, four simultaneous TTL outputs, and four simultaneous TTL inputs. The function generator is implemented using a Cypress Semiconductor Programmable System-On-Chip (PSoC) prototyping kit. Using a National Instruments data acquisition device with analog I/O and digital I/O capability, students design an automated test & measurement system for testing the PSCB. Software is implemented with a state machine using LabVIEW. The program provides instructions to the user, using pop-up windows and/or text indicators, during the test. The program also prompts the user for adjustments (pots, switches, etc.) during the test. Additionally, the program writes test data to a file on disk. The file contains the user name, time & date stamp, and the serial number of the PSCB. This paper provides a detailed listing of the engineering requirements for the project. For the software design, functional requirements and operating sequence are provided. A summary of the contents of student reference materials and the lab handout are also included. Assessment results showing grading statistics, lab report format, and grading rubric, are provided. An example of student work is included, along with a project assessment. Recommendations are shown to help ensure student success on the project.

In this paper, system design and simulation to develop a novel wide-band (WB) measurement system for ac partial discharge (PD) pulse current signals are introduced. The acquisition unit of the measurement system contains four channels, one used as synchronization and the three WB for PD measurement with adjustable sampling rate up to 1 GS/s and bandwidth of 10 kHz ∼ 300 MHz, which record the pulses current with their whole waveforms and the occurrence time or phase information. Grouping and separation technology used in the system resorting to the measured pulse waveform sequence is described, which can deal with the de-nosing and multi-PD sources problems before the classification to the PRPD pattern. So it makes a huge difference between those conventional ac PD detection systems only with peak value time series. Results of simulation research proves the feasibility and practicability of the designed ac PD measurement system.

This paper presents the design and realization of pressure measurement system used in FPGA processors with pressure sensor temperature drift compensation by software. This paper discusses in detail the realization of measurement system circuit, the internal structure design of FPGA software, the compensation algorithm analysis and design, and the simulation of FPGA. Finally through the test results validate the design of pressure measurement system with temperature compensation is feasible and effective.

The article presents the first attempt for design of an autonomous measurement system to aid assessment and to determine the psychological profile of soldiers. A method for ascertaining the psychological profile is presented including the physiological signals being generated by the monitored subject as an important element thereof. The measurement system used in the preliminary experiments and the design of a new, extended-functionality system, are presented. The new version of the measurement system facilitates determination of physiological parameters, environmental conditions and physical activity. In addition, it allows introduction of data on the psychological profile of the soldier to determine the degree of a soldier's adaptation to task-related situation at given point in time. The main element of the measurement system has been designed using an application-specific integrated circuit.

Due to the coming of the digital age as a result of the increasing convenience of the Internet and wireless data transmission networks, local area measurement systems are gradually being extended to wide area measurement systems. In this paper, we propose a design and implementation of a wireless remote measurement system, which is an integration of a client-server remote Windows-based signal generator, a digital storage oscilloscope, and a transmission channel of an Internet and wireless network. The experimental results show that the transmission rate of the remote measurement system can reach 1.2 K samples per second that can cause some dine delay in the whole system operation. However, due to the batching scanning mechanism in the waveform reconstruction, the overall bandwidth limitation of the measurement system is limited by the characteristics of the interface circuits. The primary results from the test circuit measured by a local oscilloscope and our experimental system agree with each other.

The traditional temperature measurement and control system of chemical instruments can not accurately grasp the basic condition of temperature data, resulting in low efficiency of measurement and control. Therefore, a temperature measurement and control system of chemical instruments based on the Internet of things is designed. According to the relevant performance of the hardware components of the system, the system information of the control center is studied, and the correlation of the internal system is studied. Based on this, the command of hardware mode transformation is executed. After the hardware design is realized, the system software design is realized on the premise of hardware data. Combined with the measurement and control algorithm, the measurement and control mode of the center is continuously studied, the data difference between the systems is adjusted, and the contradiction between the measurement and control data is avoided. The experimental results show that the design of chemical instrument temperature measurement and control system based on Internet of things has higher measurement and control efficiency, shorter measurement and control time, and improves the accuracy of measurement and control.KeywordsInternet of thingsTemperature measurement and control of chemical instrumentsTemperature measurement and control systemDesign of measurement and control system

Design of Security Monitoring System for Geological Data Library of Hainan Province

Accurate and reliable measurement of rotational speed is desirable in many industrial processes. A novel method for rotational speed measurement using a low-cost camera and image processing techniques is presented in this paper. Firstly, sequential images are continuously processed using a similarity evaluation method to obtain the periodic similarity level of captured images. Subsequently, the rotational speed is determined from the periodicity of a restructured signal through Chirp-Z transform and parabolic interpolation based auto-correlation, respectively. The measurement principle and system design are presented. The advantages of the proposed measurement system include non-contact measurement, low cost, no markers required and high accuracy. Experimental investigations into the effects of the periodicity detection algorithm, frame rate and image resolution on the accuracy and reliability of the measurement system are conducted on a purpose-built test rig. Experimental results demonstrate that the system with the frame rate of 100 fps yields a measurement error within ±0.6% over a speed range from 100 to 3000 RPM (Revolutions Per Minute). More accurate and reliable speed measurements over a wider speed range are achievable with higher frame rates.

With the miniaturization and increased efficiency of electronic devices, near-field radiative heat transfer (NFRHT) has become a crucial factor in thermal management studies. In recent studies, the strong suppression of NFRHT through superconducting transition offers a novel approach to thermal management technology, which the comprehensive understanding of the NFRHT behaviour between the superconductors is needed. Therefore, it is necessary to develop a reliable NFRHT measurement system for superconducting films in cryogenic temperature. In this work, a cryogenic NFRHT measurement system based on LN2 was been introduced. We present a theoretical investigation of a pre-designed device, including its measurement principles, system design and temperature simulations. The accuracy verification experiment of gap measurement has been carried. Combined with the theoretical simulation and the experimental result, the combined unaccuracy of the home-built device is 1.166%, with the maximum error in the measured gap size was 1.156% and the temperature measurement error was 0.039%.