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Automatic mercury thermometer calibration method based on machine vision

A mercury thermometer and machine vision technology, used in thermometers, thermometer testing/calibration, instruments, etc., can solve problems such as large estimation error, human eye fatigue failure, slow speed, etc., to improve production efficiency and quality, and improve product competition. power and reduce production costs

Inactive Publication Date: 2015-01-28
LIAOCHENG UNIV
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AI Technical Summary

Problems solved by technology

In China, manufacturers of mercury thermometers are still using manual testing methods to check whether the thermometer is qualified (that is, whether the displayed temperature value is consistent with the actual temperature value). This method has low efficiency, slow speed, large estimation error, and human eye fatigue failure. It is difficult to meet the requirements of modern production in terms of accuracy, efficiency and automation, and it is easy to cause scald accidents when the detection temperature is high, so the verification level of mercury thermometers needs to be improved urgently

Method used

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  • Automatic mercury thermometer calibration method based on machine vision
  • Automatic mercury thermometer calibration method based on machine vision
  • Automatic mercury thermometer calibration method based on machine vision

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Embodiment 1

[0024] Embodiment 1 A kind of automatic verification method of mercury thermometer based on machine vision, flow process is as follows figure 1 as shown, figure 2 It is a schematic diagram of the automatic verification system for mercury thermometers based on machine vision of the present invention.

[0025] The specific steps are:

[0026] 1) Put the thermometer to be verified in the constant temperature tank until the mercury column is stable, and the temperature of the constant temperature tank is the verification temperature .

[0027] 2) Use the CMOS line array camera to collect the image of the mercury thermometer processed in step 1, and transfer the image to the computer and use the HALCON machine vision software to perform preprocessing such as contrast enhancement and bottom hat transformation on the obtained image. The bottom hat transformation (bot-hat) is an algorithm that subtracts the original image from the closed operation image. Assume is the inpu...

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Abstract

The invention disclose an automatic mercury thermometer calibration method based on machine vision. The method comprises the following steps for a selected calibration temperature: 1) a thermometer to be calibrated is put into a thermostatic bath until the mercury column of the thermometer has no change, and the temperature of the thermostatic bath is set to the selected calibration temperature; 2) a CMOS line-scan digital camera is used for obtaining a thermometer image which comprises the scale marks and numbers on the thermometer and the height of the mercury column; 3) the obtained image is processed and the reading of the thermometer is identified, the error range is set from -0.05 to +0.05, and the products of which the errors exceed the range are unsatisfied. The automatic mercury thermometer calibration method based on the machine vision is capable of completing automatic calibration quickly and accurately, and is capable of taking the place of labor and saving a large amount of labor; as a result, the production cost is reduced, and meanwhile, the production efficiency and the production quality are improved, and the product competitiveness is improved.

Description

technical field [0001] The invention relates to the technical field of thermometer verification, in particular to an automatic verification method for mercury thermometers. Background technique [0002] Mercury thermometer is a medical and sanitary device that is always available in medical treatment and household, so the market demand is relatively large. In China, manufacturers of mercury thermometers are still using manual testing methods to check whether the thermometer is qualified (that is, whether the displayed temperature value is consistent with the actual temperature value). This method has low efficiency, slow speed, large estimation error, and human eye fatigue failure. Insufficient, etc., it is difficult to meet the requirements of modern production in terms of accuracy, efficiency and automation, and it is easy to cause scald accidents when the detection temperature is high, so the verification level of mercury thermometers needs to be improved urgently. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K15/00
Inventor 葛广英张银苹葛菁
Owner LIAOCHENG UNIV
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