The most important factor in ensuring the accuracy of temperature measurement is the emissivity, the distance to the spot, the location of the spot, and the field of view. Through the communication and consultation with the infrared temperature measurement experts and equipment manufacturers' technicians, through a variety of methods and repeated practice, a set of calibration equipment was self-made with reference to the principle of the blackbody furnace, and the self-calibration comparison of the method was verified by comparison. Practically feasible. Since the calibration is complete the basic alignment error, variations affect the distance measurement, and determining the range of emissivity, infrared thermometer prior to testing and then adjusted to the best condition for field testing.
The self-calibration method of the infrared thermometer is now described as follows:
2.1 made simple blackbody blackbody furnace tank <br> <br> reference to the principles and practical experience in the use of self-calibration than the standard black body is simple homemade water tank, water tank specifications for 450mmx300mm, from metal production, internal equipped Electric heaters. Use a well-stabilized 1.5-stage pressure thermometer (available with an assayed glass liquid thermometer instead) as a standard to measure the temperature in the tank, taking into account the measurement of the surface temperature of most organic materials, paints or oxidized surfaces. When black plastic cloth or plain black paint is applied to the surface to be measured to compensate to make the black cloth or black paint reach the same temperature as the base material, the temperature of the surface of the tape or paint is measured, which is the working experience of true temperature. At the same time consider the spot positioning test, with 80mmx80mm black adhesive paste at the same depth as the pressure thermometer probe liquid level, after the water in the tank boils 5min, the temperature field in the tank when the infrared instrument is used to target the center point of the black tape Comparison.
2.2 Origin <br> <br> value transfer in order to ensure effective work carried out by the self-calibration, as compared to the standard is BWY-803 temperature controller, the second traceable to the enterprise standard mercury thermometer device.
2.3 technical requirements <br> <br> infrared thermometer affect the basic measurement error and change in the distance of not more than a predetermined table.
2.4 Determination of calibration items <br> <br> The field experience and usage, calibration items mainly to complete the visual inspection, the measurement of the basic error, affect the distance measuring range of the assay and varying emissivity.
2.5 Calibration Method 2.5.1 Visual Inspection 1) All parts are assembled well and no defect is found;
2) Characters, signs, and scales should be clear;
3) Appearance and parts should be well treated and there should be no corrosion and mildew.
4) If there is a "BAT" prompt, replace the battery in time;
5) The objective lens and eyepiece are free of damage and aiming should be clear. If the environment is dusty, the lens surface should be cleaned, the surface dust should be blown with clean air, or the dust should be brushed off with a soft brush.
2.5.2 Determination of the basic error <br> <br> attention to environmental conditions, is not water vapor, dust, smoke, carbon dioxide and other intermediate medium, otherwise blocks the optical instrument affect self-calibration results. The infrared thermometer to be tested is placed at (20+2)°C room temperature and preheated for 20 minutes before being self-calibrated. This method calibrates the 100°C point's basic error, the influence of measuring distance change and the range of emissivity, and makes a qualitative test analysis on the equipment. Heat the water tank until the water is boiled for 5 min. The temperature field is constant and tested. Adjust the emissivity of the infrared thermometer to 0.94 with a distance of 2 m. Measure the center point of the black cloth on the water tank and calculate the error based on the measurement result:
γ=[(EBC-EB)/EB]×100%
In the formula:
γ is the basic error;
EBC is the measured infrared thermometer (°C);
EB is the corrected standard thermometer indication (°C);
2.5.3 Effect of change in the distance measurement <br> <br> holding predetermined basic error measurement conditions, the measurement distance is changed by one 4m, 6m, 8m, 10m, 12m measured sequentially recorded measurements, the measurement error of the basic The values ​​are compared and the error caused by the change in the measurement distance does not exceed the requirements of Table 1.
2.5.4 emissivity determine the scope of <br> <br> emission rate is an important indicator of the impact of the measurement results, select the appropriate transmission rate is essential. Since long-term field tests may cause changes in the emissivity measurement range of the infrared thermometer, determining the range of emissivity before use directly affects the measurement results. Adjust the measurement distance to 2m, keep the indicating value (°C) of the infrared thermometer consistent with the indicated value of the standard thermometer (°C), and repeatedly adjust the emissivity of the infrared thermometer to be measured. At this time, the infrared thermometer to be tested is launched. The rate of change is the normal range of its work.
2.6 Calibration conditions 1) When measuring the infrared thermometer, the required temperature is (20 ± 2) °C, humidity ≤ 85%;
2) The environment is clean, no vibration, no vapor, dust, smoke, carbon dioxide and other intermediate media.
3) The water in the tank is self-calibrated after the temperature is stable for 5 minutes after boiling.
4) Self-calibration should be directed to the center of the black plastic cloth in the self-made heating water tank. When the measurement is repeated, the measurement azimuth and distance should be kept the same.
2.7 calibration interval <br> <br> infrared thermometer intervals for the first field use, calibration at any time.
2.8 Processing of test results 1) infrared thermometer is a measurement error repair intervals about 0.1, retains the right number of digital bits of a reserved bit is 1, if it exceeds 0.5, plus 1 bit Reserved If less than 0.5, the reserved bits remain unchanged; if it is equal to 0.5, the reserved bits are invariable when even numbers (0, 2, 4, 6, 8) are odd (1, 3, 5, 7, 9) When it is, the reserved bit is incremented by one. And to determine whether the qualified after the amendment.
2) After the verification, a calibration record will be issued to facilitate data collection and archiving. Records include calibration address, number of the infrared thermometer to be tested, load, calibration distance, calibration results, ambient temperature, humidity, calibration date, time, and calibration personnel.
The self-calibration method of the infrared thermometer is now described as follows:
2.1 made simple blackbody blackbody furnace tank <br> <br> reference to the principles and practical experience in the use of self-calibration than the standard black body is simple homemade water tank, water tank specifications for 450mmx300mm, from metal production, internal equipped Electric heaters. Use a well-stabilized 1.5-stage pressure thermometer (available with an assayed glass liquid thermometer instead) as a standard to measure the temperature in the tank, taking into account the measurement of the surface temperature of most organic materials, paints or oxidized surfaces. When black plastic cloth or plain black paint is applied to the surface to be measured to compensate to make the black cloth or black paint reach the same temperature as the base material, the temperature of the surface of the tape or paint is measured, which is the working experience of true temperature. At the same time consider the spot positioning test, with 80mmx80mm black adhesive paste at the same depth as the pressure thermometer probe liquid level, after the water in the tank boils 5min, the temperature field in the tank when the infrared instrument is used to target the center point of the black tape Comparison.
2.2 Origin <br> <br> value transfer in order to ensure effective work carried out by the self-calibration, as compared to the standard is BWY-803 temperature controller, the second traceable to the enterprise standard mercury thermometer device.
2.3 technical requirements <br> <br> infrared thermometer affect the basic measurement error and change in the distance of not more than a predetermined table.
2.4 Determination of calibration items <br> <br> The field experience and usage, calibration items mainly to complete the visual inspection, the measurement of the basic error, affect the distance measuring range of the assay and varying emissivity.
2.5 Calibration Method 2.5.1 Visual Inspection 1) All parts are assembled well and no defect is found;
2) Characters, signs, and scales should be clear;
3) Appearance and parts should be well treated and there should be no corrosion and mildew.
4) If there is a "BAT" prompt, replace the battery in time;
5) The objective lens and eyepiece are free of damage and aiming should be clear. If the environment is dusty, the lens surface should be cleaned, the surface dust should be blown with clean air, or the dust should be brushed off with a soft brush.
2.5.2 Determination of the basic error <br> <br> attention to environmental conditions, is not water vapor, dust, smoke, carbon dioxide and other intermediate medium, otherwise blocks the optical instrument affect self-calibration results. The infrared thermometer to be tested is placed at (20+2)°C room temperature and preheated for 20 minutes before being self-calibrated. This method calibrates the 100°C point's basic error, the influence of measuring distance change and the range of emissivity, and makes a qualitative test analysis on the equipment. Heat the water tank until the water is boiled for 5 min. The temperature field is constant and tested. Adjust the emissivity of the infrared thermometer to 0.94 with a distance of 2 m. Measure the center point of the black cloth on the water tank and calculate the error based on the measurement result:
γ=[(EBC-EB)/EB]×100%
In the formula:
γ is the basic error;
EBC is the measured infrared thermometer (°C);
EB is the corrected standard thermometer indication (°C);
2.5.3 Effect of change in the distance measurement <br> <br> holding predetermined basic error measurement conditions, the measurement distance is changed by one 4m, 6m, 8m, 10m, 12m measured sequentially recorded measurements, the measurement error of the basic The values ​​are compared and the error caused by the change in the measurement distance does not exceed the requirements of Table 1.
2.5.4 emissivity determine the scope of <br> <br> emission rate is an important indicator of the impact of the measurement results, select the appropriate transmission rate is essential. Since long-term field tests may cause changes in the emissivity measurement range of the infrared thermometer, determining the range of emissivity before use directly affects the measurement results. Adjust the measurement distance to 2m, keep the indicating value (°C) of the infrared thermometer consistent with the indicated value of the standard thermometer (°C), and repeatedly adjust the emissivity of the infrared thermometer to be measured. At this time, the infrared thermometer to be tested is launched. The rate of change is the normal range of its work.
2.6 Calibration conditions 1) When measuring the infrared thermometer, the required temperature is (20 ± 2) °C, humidity ≤ 85%;
2) The environment is clean, no vibration, no vapor, dust, smoke, carbon dioxide and other intermediate media.
3) The water in the tank is self-calibrated after the temperature is stable for 5 minutes after boiling.
4) Self-calibration should be directed to the center of the black plastic cloth in the self-made heating water tank. When the measurement is repeated, the measurement azimuth and distance should be kept the same.
2.7 calibration interval <br> <br> infrared thermometer intervals for the first field use, calibration at any time.
2.8 Processing of test results 1) infrared thermometer is a measurement error repair intervals about 0.1, retains the right number of digital bits of a reserved bit is 1, if it exceeds 0.5, plus 1 bit Reserved If less than 0.5, the reserved bits remain unchanged; if it is equal to 0.5, the reserved bits are invariable when even numbers (0, 2, 4, 6, 8) are odd (1, 3, 5, 7, 9) When it is, the reserved bit is incremented by one. And to determine whether the qualified after the amendment.
2) After the verification, a calibration record will be issued to facilitate data collection and archiving. Records include calibration address, number of the infrared thermometer to be tested, load, calibration distance, calibration results, ambient temperature, humidity, calibration date, time, and calibration personnel.
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