Multichannel Data Logger Research Articles

Optimizing Air Ventilation Cooling With Earth-Water Heat Exchangers in Residential Buildings

This study investigated the cooling effect of an Earth Water-Air Heat Exchanger (EWAHE) device for ventilation applications. To address the lack of data on EWAHE performance in moderate climates, we measured temperature parameters (inlet-outlet, indoor-outdoor, water, and soil) continuously for three days. Air temperatures, air flowrate, light intensity are measured using a multi-channel data logger with several sensors. Results showed that the EWAHE effectively reduced indoor air temperature by an average of 7.5°C with a maximum reduction of 9.3°C, offering a promising passive cooling solution for buildings. The primary limitation of this study is that it requires open space around the building to place the device, so this method is inappropriate for building in a dense urban area. Future studies could investigate the association between ground-water cooling effect and natural ventilation without using energy for air circulation.

Anthropogenic noise predicts sea turtle behavioural responses

Anthropogenic noise is a pollutant of global concern. While the effects of underwater noise pollution have been frequently studied in fish and mammals, our understanding of how this anthropogenic stressor affects marine reptiles is scant. Using a multichannel data logger equipped with a camera and hydrophone, we quantified behavioural responses of a free-ranging green turtle (Chelonia mydas) to vessel noise in the Galapagos Archipelago, an important nesting site in the eastern Pacific. We found that while travelling the turtle increased its vigilance with increasing vessel noise. However, when on the seabed the turtle did not increase its vigilance with increasing noise levels. Our findings illustrate that noise pollution has the potential to alter overall time budgets of animals. Identifying real-time responses of wild animals illustrate how in situ approaches allow to assess the effects of human activities on marine systems.

Experimental investigation of water to air heat exchanger performance as passive cooling strategy on ventilation system in tropical region

This experimental study aims to investigate and analyze the performance of a Water-Air Heat Exchanger that functions as passive cooling in a building ventilation system in the tropics. Before being blown into the room, the high-temperature outdoor air will be passively cooled by the lower-temperature water. Air driven by an Inline Duct Fan with a constant mass flow rate of 4.68 cubic meters per minute flows through a PVC hose as a heat exchanger inserted into a full water reservoir with a diameter of 100 cm and a height of 110 cm. A heat exchanger hose with a diameter of 6.35 cm and a length of 4130 cm is installed in a spiral-circular manner with a total of 16 coils with a diameter of 80 cm to increase the heat transfer effectiveness between water and air. The passive cooling effectiveness is analyzed by decreasing the air temperature between the inlet and outlet of the ventilator after passing through the heat exchanger. The temperature, humidity, and daylight measurement data were carried out for 36 consecutive hours using a multichannel data logger at several locations; ventilator inlet, ventilator outlet, water in the tub, and outside air. The measurement results show that the designed water-to-air heat exchanger provides a significant passive cooling effect and can reduce air temperature to 6.88 °C. By utilizing the passive cooling effect, the cooling energy gain obtained during the measurement period in the ventilation system of this building is 8.3 kWh. The methodology and results of this research are expected to make a positive contribution to the development of the concept of energy-efficient buildings by using passive cooling techniques

A Low-cost Automatic System for Long-term Observations of Soil Temperature

The description of the physical parameters characterizing heat transport in the soil medium, especially on a regional scale, requires long-term and high frequency observations of temperature changes in soil profiles. This paper presents a project for a multi-channel, modular and universal data logger for temperature distribution data collecting in the soil profile, based on open electronic components, such as Arduino microcontroller systems and DS18B20 thermometers. The data logger tests were carried out in two profiles. The seven-month tests did not show any errors in the functioning of the measurement set. The presented device requires an average current of 320 µA, which allows for its stable operation on one battery set for about 300 days in temperate climate conditions. The DS18B20 thermometers allow for accurate and stable temperature measurement (the mean absolute error after laboratory calibration was 0.02°C). The cost of a single measurement-registration device was approximately 76 EUR, representing a competitive price in comparison with commercial data loggers. This allows, with relatively low expenditure, the creation of extensive observation networks for the analysis of the heat flow process in high temporal and spatial resolution.

Pendulum-Based River Current Energy Converter for Hydrometric Monitoring Systems

Energy harvesting from flowing water is important for supplying hydrometric monitoring systems. Nevertheless, it is challenging due to the chaotic water flow in only one main direction and the relatively weak energy profile. In this paper, a novel energy harvester has been proposed, designed, and validated. The converter consists of a pendulum, a gearbox, two overrunning clutches, a spiral spring, and a generator. By coupling the kinetic energy via an oscillating mass equipped with a magnetic spring, it is possible to accommodate the power supply, electronics, and sensors with data transmission in a completely closed, encapsulated, stable housing without an interface to the outside. In addition, an energy management circuit and a battery charging circuit were developed that could be housed in the sealed enclosure. The pendulum transducer prototype was tested with the developed online hydrometric measurement station, which consists of a multi-channel data logger with a cellular modem and a tipping bucket rain gauge sensor. The overall system was successfully validated by experimental studies in a river.

Microstrain Analysis of Selective Pressure Techniques for Mandibular Complete Denture Impression: An In Vivo Study.

AimThe present in vivo study was undertaken for microstrain analysis of the selective pressure impression technique using strain gauges in mandibular complete denture impression.MethodologyTen completely edentulous patients undergoing complete denture treatment were selected for the study. For each patient, mandibular casts were made, and two custom trays were fabricated on the mandibular cast. These mandibular trays were divided into two groups: those with mandibular impressions made in the custom tray with the use of a spacer (MST) and those without a spacer (MWS). For each patient, a primary impression was made by using an impression compound. After that, the primary cast was obtained, and the custom tray was fabricated by using auto polymerizing resin. Then strain gauges were attached to the particular areas of the tray. The customized tray with zinc oxide eugenol impression material was seated in the patient's mouth for the final impression. The strain produced during impression making at different areas was recorded by a multi-channel (six) strain amplifier and data logger (8-channel digital strain indicator NIC, Jaipur, India). The data obtained were subjected to statistical analysis using an independent t-test (for quantitative data within two groups). The level of significance was set at p=0.05 (p<0.05-significant, p<0.01-highly significant, p<0.0001-very highly significant).ResultsThe comparison of the percentage of microstrain produced at the relief area with and without spacer tray design showed a statistically significant (p=0.001) result with a greater number of percentages of microstrain among those without spacers (94.19) than with spacer (72.09) tray design.ConclusionThe use of a tray with relief for selective pressure impression of an edentulous mandible resulted in a desirable pressure distribution at the alveolar crests and buccal shelves.

Multichannel Data Logger for Combat Vehicle

The multichannel data logger is the one of the prominent component in any instrumentation system, the control process to give a high resolution to store accurate data from the sensing elements which varies depends on the different applications. In this point of view there are many developed data loggers are customized and general purpose data logger are available in the market with typical sampling frequency of 100 KHZ. Although the general purpose data logger with many of the time is suitable for laboratory level purpose when it comes to the defense, very special testing procedure based manufacturing process, larger channel sensing methods with a well-designed and adapted to specific application based customized data logger always been the under development. Proposed data logger is enabled with 8 channels IoT (Internet of things).

Multichannel Data Logger for Combat Vehicle

The multichannel data logger is the one of the prominent component in any instrumentation system, the control process to give a high resolution to store accurate data from the sensing elements which varies depends on the different applications. In this point of view there are many developed data loggers are customized and general purpose data logger are available in the market with typical sampling frequency of 100 KHZ. Although the general purpose data logger with many of the time is suitable for laboratory level purpose when it comes to the defense, very special testing procedure based manufacturing process, larger channel sensing methods with a well-designed and adapted to specific application based customized data logger always been the under development. Proposed data logger is enabled with 8 channels IoT (Internet of things).

Investigation of the so-called Magnetic North Immeasurable Area in the South Sea of Korea by a newly assembled three axis Magnetometer

An area exists on the South Sea of Korea where the magnetic compass is said to turn round and round not giving a fixed direction to the navigator.We newly assembled a three axis magnetometer system composed of a three axis fluxgate magnetometer, a GNSS compass, a two axis clinometer, and a multi-channel data logger, to investigate if there really exists such an area.We supposed that the horizontal component of the vectorially measured magnetic field on such an area will be too small to maintain the magnetic compass’s needle to one fixed direction. We processed the measured data mainly through two steps. Firstly we transformed the random coordinate system into a fixed coordinate system, i. e., into the geographical coordinate system. Secondly we performed an inversion to eliminate the effect of the ship itself from the measured data.On the finally achieved anomaly map we could not find such an area where the horizontal component is so small that it could not maintain the magnetic compass’s needle to a fixed direction.We conclude that such statement about the existence of the so-called magnetic north immeasurable area on the South Sea of Korea does not have a strict scientific base.

Design and Development of a Multi-Channel Plug-in Type Wireless Data Logger for Energy Measurement

Increasing demand of electrical energy and its rising prices have enforced the need of managing usage of electrical energy more efficiently. This requires regular monitoring of electrical appliances to timely identify inefficient energy consumption due to faulty conditions, inefficient designs, user negligence, etc. In this paper, design and development of a multi-channel wireless data logger is presented that aims to accurately measure the value of energy and related parameters like VRMS, IRMS and instantaneous power from more than one single phase application in real time. The proposed data logger is aimed to be low cost and to be a plug and play type device that can easily be introduced between mains and the appliance for energy monitoring. Data collected from various appliances are communicated to a central computer over a Bluetooth wireless link. The computer hosts a simple graphical user interface (GUI) based application that allows user to log the data as and when required. The proposed data logger is designed using CS5460A single phase bi-directional power/energy IC from Cirrus logic interfaced with AVR ATmega32 microcontroller. A wireless link between is established using AUBTM-20 Bluetooth modules from Austar Technology. Serial EEPROM is also included in the proposed design to store the data locally on the board for later use. GUI for the data logger has been designed using MATLAB. The works presented is a part of on going research towards development of a low cost Home Energy Management (HEM) system. 

Designed non-fired clay mixes for sustainable and low carbon use

This paper reports on designed non-fired clay mixes for sustainability and low carbon use. Ground Granulated Blastfurnace Slag (GGBS), an industrial by-product, was used as a partial substitute for conventional stabiliser (Lime or Portland cement) to stabilise Kaolinite Clay (KC) and Lower Oxford Clay (LOC), for sustainable and low carbon non-fired clay building material production. Although GGBS has been used extensively in concretes to reduce the carbon footprint, there is an unexplored potential for its use as a cement replacement for stabilised soil production. The benefits of using GGBS in non-fired clay building material development include lower emissions of greenhouse gases and improved durability. The parameters considered under this study are: (1) material characterisation, (2) unconfined compressive and (3) durability. For the assessment of durability, a MX 2000VJ Tech multi-channel data logger equipped with a digital displacement transducer and computer device was employed to monitor the linear expansion behaviour of the stabilised test specimens. The 90-day unconfined compressive results for the test specimens showed that there is significant strength gain (up to 5N/mm2) for all the stabilised mixtures. The lime-activated GGBS stabiliser has significantly higher influence in the strength gain compared to the equivalent PC-based system. These results suggest that there is potential in using Lime or Portland cement activated GGBS blend for the stabilisation of natural clay soil for sustainable and low carbon building materials production.

A Maximum Power Point Tracker for Long-Term Logging of PV Module Performance

We present a monitoring system for the field test of photovoltaic modules. The system is designed for the monitoring of individual modules under maximum power point (MPP) conditions that allow the extraction of the energy yield of different modules under optimum conditions. It can also be used to monitor the performance and long-term stability of modules under realistic field conditions. The monitoring system consists of an individual MPP tracker attached to each module under test. The measurement data are transmitted to a central multichannel data logger by means of analog voltages proportional to the current at MPP, i.e., <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mp</sub> , and voltage at MPP, i.e., <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mp</sub> , of the modules.

An improved datalogger and novel probes for continuous redox measurements in wetlands

In soils and sediments, the redox potential (Eh) is an important parameter controlling the persistence of many organic and inorganic compounds. Especially in wetlands, fluctuations in redox potential values can be very large and depth dependent. For this reason, field deployable logging systems have previously been developed, yet these systems were limited in several aspects. Here we report the development of an improved multichannel datalogger (HYPNOS) and two novel probes for continuous monitoring of Eh profiles, and briefly illustrate the potential applications. The combination of a multichannel logger with different types of probes allows characterisation of spatial and temporal variability of redox potential in relation to environmental and ecological parameters, and we expect this will greatly enhance our knowledge of the functioning of wetlands.

Geophysical Prospection in the Southern Harz Mountains, Germany: Settlement History and Landscape Archaeology Along the Interface of the Latène and Przeworsk Cultures

The southern Harz Mountains are located on the northern periphery of the Latène culture, which was organized around central sites. Here, towards the end of the second century bc, settlements of the Przeworsk culture appear that provide evidence of a process of migration into a limited ‘cultural island’. In this archaeological context we have used large-scale magnetic mapping and electrical resistivity tomography to determine localities where subsequently archaeological excavations were carried out. Magnetic prospecting has been performed with a multisensor gradiometer array mounted on a cart. Using a newly developed multichannel data logger LEA-D2 supporting a GPS unit for accurate real-time positioning, high-resolution measurements with a rate of more than 1 ha h−1 became possible. Electrical resistivity tomography has been carried out over selected sites to gain additional information on the subsurface from a different perspective. Copyright © 2011 John Wiley & Sons, Ltd.

Development of Multi-Channel Data Logger for Indoor Environment

Environment monitoring has become a necessity because of global warming and climate change. All across the globe researchers are trying to monitor the environmental parameters of temperature, humidity and pollutants gases mere precisely in real time. Sensing system using sensor arrays has been developed to monitor indoor environment, however, these systems are costly and have not gained wide acceptance. Precise monitoring of building environment has a huge potential in terms of energy savings. In this paper, an effort has been made to develop a 4-channel energy efficient and low cost data logger for indoor environment. The Data logger is proposed to be developed with the use of PIC 18F4458. Real Time Clock and EEPROM are interfaced for sampled data with the instance of sampling time and month/date/year; these sampled data will be stored in the EEPROM to the note pad tabular form with the help of graphical user interface (GUI).

Development of Multi-Channel Data Logger for Indoor Environment

Environment monitoring has become a necessity because of global warming and climate change. All across the globe researchers are trying to monitor the environmental parameters of temperature, humidity and pollutants gases mere precisely in real time. Sensing system using sensor arrays has been developed to monitor indoor environment, however, these systems are costly and have not gained wide acceptance. Precise monitoring of building environment has a huge potential in terms of energy savings. In this paper, an effort has been made to develop a 4-channel energy efficient and low cost data logger for indoor environment. The Data logger is proposed to be developed with the use of PIC 18F4458. Real Time Clock and EEPROM are interfaced for sampled data with the instance of sampling time and month/date/year; these sampled data will be stored in the EEPROM to the note pad tabular form with the help of graphical user interface (GUI).

重粘土壌におけるトラクタ作業の所要動力測定システムの開発

A measurement system that measures the power requirement of a work machine was developed to clarify the conditions of applicability of pan breakers and trenchers. These implements are used for the improvement of field drainage in the Jahgaru soil region. This measurement system is composed of a multi-channel data logger, a notebook computer, a clinometer, an ultrasonic distance meter that measures the depth of work, a three-point linkage type traction resistance meter, and a torque meter that measures the power requirement. The traction resistance meter that was prepared for a trail product had an error rate within 5%; the range of the maximum vertical load was 5kN, and the maximum moment 20kN·m in the horizontal load was in the range 0-30kN. The time series of the traction resistance, PTO axis torque, work depth, and inclination (pitching) could be measured simultaneously, which facilitated the understanding of the local change in the state of work and the power requirement since this measurement system was used in measuring the work of trenchers.

Analysis of the environmental sensitivities of a typical dynamic epikarst system at the Nongla monitoring site, Guangxi, China

Nongla, a typical karst dynamic system (KDS) monitoring site, is located at Nongla Village, Mashan County, Guangxi, China. The data from a Greenspan CTDP300 multichannel data logger indicates that the KDS is highly sensitive to environmental changes. Multi-day and diurnal physico-chemical composition of epikarst spring water is quite different under different climatic conditions. During a day with no rainfall, water temperature and air temperature have similar variations. Electrical conductivity (EC) has good positive correlation with pH value and water temperature. During rainstorms, the physico-chemical composition of the spring water is initially strongly effected by dilution, pH and EC drop rapidly. However, half to one hour later, EC returns to normal and the CO2 effects will be the dominant physical effect. This is due to the high fissure rates and high permeability in the epikarst zone. Dilution effects were observed during the entire rainstorm event,whereas, it only acts during the earliest period of light rain. Therefore, it is necessary to examine the water–rock–CO2 combination as a whole system to explain the hydrochemical behavior of epikarst processes.

Model Identification of a Micro Air Vehicle in Loitering Flight Based on Attitude Performance Evaluation

This paper presents a model identification of a micro air vehicle in loitering flight, based on the input-output data collected from flight experiments on a homemade 1-m-sized aircraft. A miniature flight-control system, which consists of the onboard and the ground sections, is equipped with a multichannel data logger associated with the data acquisition software. Modeling and performance analysis are carried out, based on the flight-test data using a system identification technique. Two fourth-order autoregressive with exogenous input (ARX) models are identified to present the attitude characteristics of the longitudinal (pitch) and the lateral (roll) control channels, respectively. The validity of the identified model is verified by both time-domain model prediction and frequency-domain spectral analysis. Based on the proposed ARX models, two compensators are further designed using a frequency-domain method, and then added to the closed-loop control systems to improve the transient performance of the pitch- and roll-control channels. Simulations and experiments demonstrate that the flight performance obtained by the proposed ARX model-based compensation control can be improved.

2417 ウェアラブル多チャンネルデータロガーの開発とバイオエンジニアリングへの応用

2417 ウェアラブル多チャンネルデータロガーの開発とバイオエンジニアリングへの応用