Laser Liquid Level Measuring Instrument Design

To improve the dimension accuracy of integral stereolithography (SL) system, the resin liquid level in SL system need controlled. Based on the measuring principle of laser triangulation, a laser liquid level detection system for SL system has been developed. The laser liquid level detection system consists of light source, Position Sensitive Detectors (PSD), PSD signal processing circuit and data acquisition system. According to the principle that electrical signal of PSD changes when resin liquid level vary, a PSD is employed to detect the liquid level height in the liquid level detection system. Confirmation experiment is conduct to test the accuracy of the detection system, and the experiment results indicated that deviation is 0.34% in the range of 6mm, and satisfy the accuracy requirement of integral SL system.

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POSTGRADUATE TEACHING OF MEASURING INSTRUMENT DESIGN

Trends in Control and Measurement Education ◽

10.1016/b978-0-08-035736-2.50021-9 ◽

1989 ◽

pp. 81-83

Author(s):

H.R. Taylor ◽

M.M. Przybylski ◽

E. Cohen

Keyword(s):

Instrument Design ◽

Measuring Instrument ◽

Postgraduate Teaching

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Postgraduate Teaching of Measuring Instrument Design

IFAC Proceedings Volumes ◽

10.1016/s1474-6670(17)53843-4 ◽

1988 ◽

Vol 21 (6) ◽

pp. 81-83

Author(s):

H.R. Taylor ◽

M.M. Przybylski ◽

E. Cohen

Keyword(s):

Instrument Design ◽

Measuring Instrument ◽

Postgraduate Teaching

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Hydrostatic Fiber Optic Liquid Level Sensor with position sensitive detector

Metrologiya ◽

10.32446/0132-4713.2020-4-38-51 ◽

2020 ◽

pp. 38-51

Author(s):

V. N. Astapov ◽

I. N. Kozlova

Keyword(s):

Fiber Optic ◽

Effective Area ◽

Raw Material ◽

Position Sensitive Detector ◽

Fiber Optic Sensor ◽

Liquid Level ◽

Problem Solution ◽

Sensitive Detector ◽

Position Sensitive ◽

Triangulation Sensor

This article presents the rationale and methodology for developing an intrinsically safe device, namely, a hydrostatic fiber optic sensor with a position-sensitive detector for monitoring the level of oil products in large-capacity tanks at oil depots and during pumping in a raw material warehouses. This device suitable for continuous monitoring of the liquid level, based on the measurement of a hydrostatic column of liquid with automatic offset of changes in the density of the liquid. Offset is carried out by means of a displacer (a fully submerged float), inside which a housing with a position-sensitive detector (PSD) is integrated. Theoretical validation of the bellows suspension usage for a displacer is given. During filling a container with a liquid whose level is measured, liquid bellows, the movement of which is recorded by an optical triangulation sensor using the reflected infrared ray incident on the bottom of the bellows. The principle of the triangulation sensor operation is based on the geometric properties of the triangles. The pulses of infrared radiation come through a fiber optic cable. In order to measure the movement of the surface (the bottom of the bellows) by measuring the movement of the reflected beam, a position-sensitive detector is used, which is located in a remote controller. In this device for the intrinsic safety problem solution, optical inputs of a fiber optic flat cable are located in the active zone of the sensor, which is connected to the optical inputs of a position-sensitive detector, operated on the principles of photoelectric effect. The light spot moving along the sensitive zone and converted by the detector into a one-dimensional signal proportional to the distance to the object. hydrostatically applies pressure over the entire effective area of the measuring

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The Software «MMI–calibration 3.0»

Metrologiya ◽

10.32446/0132-4713.2020-3-16-24 ◽

2020 ◽

pp. 16-24

Author(s):

Alexandr D. Chikmarev

Keyword(s):

Power Series ◽

Data Processing ◽

Statistical Treatment ◽

Correction Function ◽

Calibration Function ◽

Measuring Instrument ◽

Working Standard ◽

Calibration Protocol ◽

Error Probabilities ◽

Continuous Power

A single program has been developed to ensure that the final result of the data processing of the measurement calibration protocol is obtained under normal conditions. The calibration result contains a calibration function or a correction function in the form of a continuous sedate series and a calibration chart based on typical additive error probabilities. Solved the problem of the statistical treatment of the calibration protocol measuring in normal conditions within a single program “MMI–calibration 3.0” that includes identification of the calibration function in a continuous power series of indications of a measuring instrument and chart calibration. An example of solving the problem of calibration of the thermometer by the working standard of the 3rd grade with the help of the “MMI-calibration 3.0” program.

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