scholarly journals Design and uncertainty analysis of field service gas flow standard device based on standard meter method

2021 ◽  
Vol 257 ◽  
pp. 01060
Author(s):  
Xueqing Hou ◽  
Bin Li ◽  
Mi Yao
Keyword(s):  
Uncertainty Analysis ◽  
Gas Flow ◽  
Field Service ◽  
Standard Device ◽  
Measurement Results ◽  
Working Principle

This paper introduces the composition and working principle of field service gas flow standard device based on standard meter. Through the analysis of the uncertainty of the device and the verification of the measurement results, it is confirmed that the field service standard meter method gas flow standard device can be applied to the verification of the field gas flowmeter.

scholarly journals Laser scanning–based straightness measurement of precision bright steel rods at one point

2021 ◽  
Author(s):  
Tobias Schmid-Schirling ◽  
Lea Kraft ◽  
Daniel Carl
Keyword(s):  
Laser Scanning ◽  
Optical Measurement ◽  
Sample Surface ◽  
Homogeneous Sample ◽  
Industrial Manufacturing ◽  
Continuous Quality ◽  
Accuracy And Precision ◽  
Measurement Results ◽  
Important Quality ◽  
Working Principle

AbstractIn industrial manufacturing of bright steel rods, one important quality factor is the straightness or straightness deviation. Depending on the application, deviations of less than 0.1 mm per meter rod length are desired and can be reached with state-of-the-art manufacturing equipment. Such high-quality requirements can only be guaranteed with continuous quality control. Manual straightness measurements conducted offline using a dial gauge provide accurate results on single positions of the rod. We propose a contactless, optical measurement technique based on laser scanning which has the potential to be used inline during production to inspect all rods over the entire length. Only for calibration of the system the rod needs to be turned around its axis. For the measurement of straightness deviation, it is not required to turn the rod. The method is based on evaluating the intensity signal of the reflected laser radiation against the scan angle. It is shown that in combination with an accurate calibration, this signal can be used to determine the rod’s deviation from a straight rod. We explain the measurement and calibration principle as well as data evaluation. We present the experimental setup and first measurement results on a single position on several samples. For a homogeneous sample surface and neglecting laser drift, accuracy and precision were determined to be in the range of 10–20 μm. We discuss the working principle of a potential inline system.

scholarly journals Research on collaborative control of double-plunger gas prover based on EtherCAT

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2667-2687
Author(s):  
Zhipeng Xu ◽  
Feipeng Xu ◽  
Dailiang Xie
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Gas Flow ◽  
Control Unit ◽  
External Diameter ◽  
Piston Cylinder ◽  
Collaborative Control ◽  
Critical Nozzles ◽  
Parallel Mode ◽  
Working Principle

Piston prover has been widely used as a gas flow standard for its advantages of high accuracy in standard volume, flow stability and repeatability. It has also been employed as the primary gas flow standard in many countries to calibrate meters. However, it is difficult to ensure the uniformity of the inside dimension of the piston, thus the application of conventional piston provers are limited by the maximum calibration flow generated by the piston cylinder volume. In this paper, an improved piston gas prover that mainly consists of two uniform plungers was proposed. Their external diameter constitutes the flow standard. The plungers are driven by servo motor, and the high speed fieldbus EtherCAT has been introduced as the control unit. Hence the two pistons could work collaboratively and operate in three modes: single-piston mode, double-pistons parallel mode, and double-pistons reciprocating mode. Besides generating steady-flow rate, the double-plunger prover can even produce an unsteady-flow rate which could be used to research the dynamic characteristics of flow meters. The structure and working principle of the three modes were carefully introduced. Then experiments for calibrating critical nozzles were carried out, and the results show that the repeatability of the discharge coefficient could be better than 0.06%, and the pressure fluctuation during the process was less than 50 Pa.

scholarly journals Experimental and Numerical Study of a Thermal Expansion Gyroscope for Different Gases

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 360 ◽  
Author(s):  
Guillaume Kock ◽  
Philippe Combette ◽  
Marwan Tedjini ◽  
Markus Schneider ◽  
Caroline Gauthier-Blum ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Gas Flow ◽  
Numerical Study ◽  
Rotational Velocity ◽  
Measurement Range ◽  
Gas Temperature ◽  
Hot Air ◽  
Working Principle ◽  
Set Up ◽  
Different Gases

A new single-axis gas thermal gyroscope without proof mass is presented in this paper. The device was designed, manufactured and experimentally characterized. The obtained results were compared to numerical simulation. The working principle of the gyroscope is based on the deflection of a laminar gas flow caused by the Coriolis effect. A bidirectional hot air flow is generated by alternating activation of two suspended resistive micro-heaters. The heated gas is encapsulated in a semi-open cavity and the gas expands primarily inside the cavity. The thermal expansion gyroscope has a simple structure. Indeed, the device is composed of a micromachined cavity on which three bridges are suspended. The central bridge is electrically separated into two segments enabling to set up two heaters which may be supplied independently from each other. The two other bridges, placed symmetrically on each side of the central bridge, are equipped with temperature detectors which measure variations in gas temperature. The differential temperature depends on the rotational velocity applied to the system. Various parameters such as the heating duty cycle, the type of the gas and the power injected into the heaters have been studied to define the optimal working conditions required to obtain the highest level of sensitivity over a measurement range of around 1000°/s. The robustness of the device has also been tested and validated for a shock resistance of 10,000 g for a duration of 400 µs.

Investigation on the chipless RFID tag with a UWB pulse using a UWB IR-based reader

2021 ◽  
pp. 1-10
Author(s):  
Kawther Mekki ◽  
Omrane Necibi ◽  
Hugo Dinis ◽  
Paulo Mendes ◽  
Ali Gharsallah
Keyword(s):  
Radio Frequency Identification ◽  
Ultra Wideband ◽  
Rfid Tag ◽  
Triangular Patch ◽  
Chipless Rfid ◽  
Frequency Domains ◽  
Measurement Results ◽  
Reader Antenna ◽  
Frequency Identification ◽  
Working Principle

Abstract In order to encrypt/encode data based on the magnitude level of the radar cross-section (RCS), we propose an approach with a precise estimation considering the resonant characteristics of a multipatch backscatter-based chipless radio frequency identification (RFID) dedicated for chipless tags depolarization. The working principle is based on the polarization mismatch between the tag and the reader antenna to control the magnitude of the backscatter, which allows a reliable detection in real environments. We introduce in this paper a new 4-bit chipless RFID tag with an enhanced RCS, based on a triangular patch antenna with multiple resonators. Additionally, we propose an ultra-wideband impulse radar (UWB-IR)-based reader that interrogates the chipless tag with a UWB pulse, and the received backscatter was studied in both time- and frequency-domains. The antenna was operating from 4.7 to 6.1 GHz, a band allocated for RFID systems. The obtained experimental measurement results in the environment of anechoic chamber were exceptionally relevant to validate the simulation results.

Laser scanning based straightness measurement of precision bright steel rods

2021 ◽  
Author(s):  
Tobias Schmid-Schirling ◽  
Lea Kraft ◽  
Daniel Carl
Keyword(s):  
Laser Scanning ◽  
Sample Surface ◽  
Homogeneous Sample ◽  
Industrial Manufacturing ◽  
Accuracy And Precision ◽  
Measurement Results ◽  
Important Quality ◽  
Working Principle ◽  
Dial Gauge ◽  
Straight Rod

Abstract In industrial manufacturing of bright steel rods one important quality factor is the straightness or straightness deviation. Depending on the application, deviations of less than 0.1 mm per meter rod length are desired and can be reached with state of the art manufacturing equipment. Such high quality requirements can only be guaranteed with continuos quality control. Manual straightness measurements conducted offline using a dial gauge provide accurate results on single positions of the rod. We propose a contactless, optical measurment technique based on laser scanning which has the potential to be used inline during production to inspect all rods over the entire length. The method is based on evaluating the intensity signal of the reflected laser radiation against the scan angle. It is shown, that in combination with an accurate calibration this signal can be used to determine the rod’s deviation from a straight rod. We explain the measurement and calibration principle as well as data evaluation. We present the experimental setup and first measurement results on a single position on several samples. For a homogeneous sample surface and neglecting laser drift, accuracy and precision were determined to be in the range of 10 - 20 µm. We discuss the working principle of a potential inline system.

Calibration of Thermostatic Bath Used on Electronic Thermometer Verification

2014 ◽  
Vol 635-637 ◽  
pp. 819-823
Author(s):  
Qin Qing Zeng ◽  
Le Chen ◽  
Min Xie ◽  
Ya Qiong Fu ◽  
Zhen Zhou
Keyword(s):  
Uncertainty Analysis ◽  
Measurement Uncertainty ◽  
Technical Performance ◽  
Standard Device ◽  
Experiment Method ◽  
Performance Specifications ◽  
Calibration Device ◽  
Electronic Thermometer

In order to research the uniformity and volatility of thermostatic bath used on electronic thermometer verification, a method based on thermostat technical performance specifications is presented. Including the introduction of calibration device, the choice of standard device and experiment method. In the end the uncertainty analysis on the measurement of thermostatic bath uniformity and volatility is made. Experiment results show that the uniformity and volatility of this thermostatic bath are 0.0091°C and 0.0087°C/10min with the measurement uncertainty of 0.018°C, The results meet the requirements of electronic thermometer verification. It provides guarantee for the next electronic thermometer verification.

The Design of Ultrasonic Distance Measurement System for Auto Reversing Anti-Collision

2014 ◽  
Vol 602-605 ◽  
pp. 1546-1549 ◽  
Author(s):  
Hai Qin Feng
Keyword(s):  
Liquid Crystal ◽  
Measurement System ◽  
Liquid Crystal Display ◽  
High Accuracy ◽  
Distance Measurement ◽  
Alarm System ◽  
Display Module ◽  
Measurement Results ◽  
Working Principle ◽  
And Function

This paper introduces the working principle, hardware and software designs of ultrasonic distance measurement based on STC89C52RD MCU. The hardware mainly consists of ultrasonic module, liquid crystal display module, alarm module and function key circuit. The system can clearly display the measurement results with high accuracy and can be applied to auto reverse anti-collision alarm system.

Auxiliary power system technology using a hydrodynamic clutch

2003 ◽  
Vol 217 (3) ◽  
pp. 143-148
Author(s):  
N Hirtz ◽  
J Althaus
Keyword(s):  
Power Unit ◽  
General Function ◽  
System Technology ◽  
Typical Application ◽  
Auxiliary Power Unit ◽  
Auxiliary Power ◽  
Measurement Results ◽  
Oil Flow ◽  
Working Principle ◽  
System Requirements

A hydraulic clutch used for Auxiliary Power Unit (APU) drives provides a flexibility in adapting its characteristic to the requirements of the typical application. In comparison to a mechanical clutch, the hydrodynamic clutch is able to engage dynamically both unloaded and loaded. In particular, the dynamic engagement can be varied very easily by controlling the oil flow into the clutch. This paper describes the general function of the APU system and explains the advantages of the hydrodynamic clutch with respect to the system requirements. The clutch working principle and its design for the special application are presented. Measurement results illustrate the clutch performance in engaged and disengaged mode. The optimization of the APU starting procedure, which benefits significantly from the smooth clutch behaviour, is explained in detail.

Microthermocouples Sensors for Velocity and Temperature Measurements in Gas Flow

2012 ◽  
Author(s):  
François Lanzetta ◽  
Eric Gavignet ◽  
Sofiane Amrane ◽  
Philippe Baucour
Keyword(s):  
Gas Flow ◽  
Phase Method ◽  
Measurement Point ◽  
Hot Wire ◽  
Oscillating Flows ◽  
Frequency Method ◽  
Weak Response ◽  
Working Principle ◽  
Small Channels ◽  
Time Of Flight Method

This paper presents the development of two classes of sensors based on microthermocouples with different wire diameters (from 7.6 μm to 25.4 μm). The first one uses the pulsed-wire technique for the couple velocity/temperature measurement. These sensors are used with three different techniques we developed in our laboratory: the time of flight method, the oscillation frequency method and the phase method. Because the purpose of this kind of sensor is to be introduced in different microdevices, it is realized with two thermocouple wires and does not use the micromachining technologies. Its working principle is close to that of the hot wire anemometer and it presents the same advantages such as very small dimensions and weak response time. The sensor is developed in order to measure flows and temperatures in microsystems like small channels (width < 500 μm), microtubes (diameter < 53 μm) and small structures (volume < 100 μm3). The second class of sensors are based on the multi-wire thermocouple technique. In this paper we present a probe using two wires of same nature but different in diameter located close together at the measurement point. This probe is used to measure simultaneously the temperature and the velocity of flowing gas. Results will focus on oscillating flows of gas.

scholarly journals Testing of a torque sensor used to measure the parameters of the briquetting process of lignocellulosic materials

2019 ◽  
Vol 254 ◽  
pp. 05013 ◽  
Author(s):  
Krzysztof Talaśka ◽  
Dominik Wojtkowiak ◽  
Ireneusz Malujda ◽  
Krzysztof Wałęsa
Keyword(s):  
Calibration Method ◽  
Thermomechanical Properties ◽  
Measuring System ◽  
Torque Sensor ◽  
Study Results ◽  
Measurement Results ◽  
Rye Straw ◽  
Working Principle ◽  
Oat Straw ◽  
Open Working

The study presents a control and measurement system for the drive parameters of screw compactor machine with open working chamber for shredded materials. The study demonstrates the construction and working principle of the torque sensor for measuring the torque of the motor driving the compacting screw. The calibration method for the measuring system was presented together with example measurement results for compaction of broken up rye straw, oat straw and hay. The study results were analyzed for feasibility of use for the compaction of materials with specific thermomechanical properties. The conclusion presents the possible forms of application of the established solution in mass production.

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