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Measuring instrument calibration method

A technology for calibrating and measuring instruments. It is used in test/calibration devices, test/calibration volume flow, instruments, etc., and can solve problems such as large deviation of measurement results.

Inactive Publication Date: 2018-12-11
王在彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the medium flow rate greatly deviates from 100m 3 / h, for example, the flow rate is 200m 3 / h or 10m 3 / h, the measurement results have a large deviation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0024] Embodiment 1: Calibration and calibration of a spectrophotometer.

[0025] According to the Lambert-Beer law, there is a linear relationship between the measured solution concentration and the logarithm of the solution light transmittance. Within the linear interval, two concentration points X1 and X2 are selected. The principles for selecting the concentration values ​​X1 and X2 are: 1. The logarithm of the light transmittance of the solution with the concentration values ​​of X1 and CX has a linear relationship with the solution concentration; 2. The difference between the concentration values ​​X1 and X2 is relatively large, and the larger the difference is , the higher the calibration accuracy.

[0026] Prepare standard colorimetric solution with concentration X1 and concentration X2 respectively.

[0027] Measure the light transmittance of the two standard colorimetric solutions with a spectrophotometer. The standard colorimetric solution with a concentration of...

specific Embodiment approach 2

[0029] Embodiment 2: Calibration and calibration of ultrasonic flowmeters.

[0030] The measurement principle of the ultrasonic flowmeter is: select two points on the pipeline of the fluid to be measured, and the distance between these two points is L. The ultrasonic flowmeter measures and calculates the flow velocity v when the fluid flows through these two measuring points. The cross-sectional area of ​​​​is known as the D value, then the flow of the medium is: medium flow = flow rate * pipe cross-sectional area = D * flow rate. Therefore, there is a linear relationship between the measured value (medium flow rate) and the measured characteristic value (medium flow rate).

[0031] Assume that the range of the ultrasonic flowmeter to be calibrated is 0-L.

[0032] Pick two different operating points. At the first operating point, the flow rate is v1, the measured value of the standard instrument is Y1, and the measured value of the instrument to be calibrated is X1; at the ...

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PUM

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Abstract

The invention relates to a measuring instrument calibration method. For a measuring instrument with a linear relation between measured values and measured characteristic values, a two-point calibration method is adopted to calibrate the instrument according to the mathematical principle that two points determine a straight line, that is, two different measured characteristic values are selected and corresponding measured values are measured respectively, then, according to the two groups of data and based on the given mathematical formula, a linear function between the measured values and realvalues (measured characteristic values) can be calculated to finish calibration of the measuring instrument.

Description

technical field [0001] The invention relates to a calibration and calibration method of a measuring instrument, in particular to a two-point calibration and calibration method of the measuring instrument. Background technique [0002] There are many factors in the manufacturing process and use of measuring instruments that lead to deviations in the measurement results. In order to ensure the measurement accuracy of the instrument, it is necessary to calibrate and calibrate before leaving the factory, and periodically during use. [0003] For example, the spectrophotometer measures the concentration of the solution by measuring the light transmittance of the solution according to the Lambert-Beer law. A beam of parallel monochromatic light (I o ) when passing through a colored transparent solution, part of the light can pass through the solution (I t ), the other part is absorbed by the solution (I a ), and part of it is reflected by the surface of the vessel (I r ), then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00G01N21/31G01F25/00G01F1/66
CPCG01D18/00G01F1/66G01N21/31G01N2201/12784G01F25/10
Inventor 陈爱美
Owner 王在彬
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