Physics digital measuring method based on figure

A measurement method and physical quantity technology, applied in the direction of measurement devices, measurement value indication, image data processing, etc., can solve the problems of increasing device complexity, analog voltage signal interference, and affecting test accuracy, so as to avoid environmental electromagnetic field interference and highlight the essence Sexual improvement, overcoming the effect of no signal output

Inactive Publication Date: 2006-12-27
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, the disadvantage of this technology is that it is necessary to design and manufacture sensors that convert different field quantities into standard electrical signals, and the design and manufacture of sensing elements and sensors are more complicated and costly, and the performance of sensing elements is affected by the use process. It will gradually change (the so-called "aging" phenomenon) to cause the output value to drift, and the analog voltage signal output by the sensor is easily disturbed by the external electric field, which affects the test accuracy
However, the complexity of the device is increased, and the measurement error is increased by using the principle of geometric optics. In addition, the distance between the camera and the measured object is relatively long, so the proportion of the marker in the pixel matrix is ​​very small, and the resolution of the reading is low.

Method used

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  • Physics digital measuring method based on figure
  • Physics digital measuring method based on figure
  • Physics digital measuring method based on figure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Rotameter, used in gas flow measurement in carburizing / nitrogen furnaces, has obvious scale mark lines, and the indicator float can be easily captured by the camera. The maximum range value of this flowmeter is 1.2, roughly divided The number of scale lines is n=7, and the number of subdivision lines is m=3. When the float stays at a certain position and stabilizes, the number of times the float passes is recorded according to the coarse scale line and is reduced by 1 to A=2. Start to record the number of times B=2 that the subdivision line has passed, and use the interpolation method to determine the position C=0.6 of the float between B and B+1 subdivision line, according to V = [ A + ( B + C ) 1 m + 1 ] V ma...

Embodiment 2

[0024] Embodiment 2: pressure gauge, measuring the disc instrument on the cooling rate test platform, the maximum range of the pressure gauge is 0.6, the number of coarse scale lines n=7, the number of fine scale lines m=4, when the pointer is stable staying at At a certain point within the range, the number of times passed by the pointer is recorded as A=4 according to the number of times the pointer has been recorded by the coarse division line, and the number of times passed by the fine division line is recorded from A=3, and the pointer is determined by interpolation at B The position C=0.4 between the graduation line and B+1, according to V = [ A + ( B + C ) 1 m + 1 ] V max n - ...

Embodiment 3

[0025] Embodiment 3: pressure gauge, disc type measuring device outside the vacuum furnace, the maximum range of the pressure gauge is 1.6, the number of coarse graduation lines n=5, the number of fine division lines m=7, the pointer is stable when measuring exist At a certain point within the range, record the number of times the pointer passes according to the coarse division line as A=1, start recording the number of times the fine division line passes B=4 from A, and use the interpolation method to determine that the pointer is between B and B+ 1 The position between the graduation lines C=0.2, according to V = [ A + ( B + C ) 1 m + 1 ] V max n - 1 ...

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Abstract

A digital measuring method of physical quantity based on picture includes connecting digital camera to computer for shooting scale and measuring mark pictures of visual measuring instrument and processing obtained pictures, determining relative positions of pointer, floater flag and scale of instrument to calculate out data of measured physical quantity, inputting obtained picture to computer in digital form of lattice data; and identifying pictures of mark line and scale so as to solve out measuring value with numerical calculation.

Description

technical field [0001] The invention relates to a method for measuring physical quantities, in particular to a graph-based digital measurement method for physical quantities. Used in the field of automatic testing technology. Background technique [0002] In industrial production, it is often necessary to automatically measure, record and control physical quantities such as weight, stress, strain, liquid level, fluid pressure, flow rate, and vacuum degree. Many visual indicator instruments and meters that are widely used now are used by people to read the measured value of the measured physical quantity with the naked eye according to the indicated position and the scale of the scale on the dial. Its advantage is that it directly reflects the change of the measured physical quantity, has long-term manufacturing and use experience, low cost, avoids the interference of electromagnetic field in the use environment, and has good reliability and stability. Its biggest disadvant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D7/00G01D9/00G01D21/00G06T3/00G01D5/26G01D21/02
Inventor 潘健生王婧张伟民刘占仓胡明娟
Owner SHANGHAI JIAOTONG UNIV
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