Introduction to the determination of the response time of infrared thermometers
The response time represents the response speed of the infrared thermometer to changes in the measured temperature. It is defined as the time required to reach 95% of the energy of the final reading. It is related to the time constants of the photodetector, signal processing circuit and display system. The response time of some infrared thermometers can be up to 1ms, which is much faster than contact temperature measurement methods. If the target moves very fast or when measuring a rapidly heated target, a fast-response infrared thermometer should be used. Otherwise, sufficient signal response will not be achieved and the measurement accuracy will be reduced. However, not all applications require a fast-responding infrared thermometer. When there is thermal inertia for stationary or target thermal processes, the response time of the thermometer can be relaxed. Therefore, the choice of the response time of the infrared thermometer must be adapted to the conditions of the target being measured. The response time is determined mainly based on the target's movement speed and the target's temperature change speed. For stationary targets or targets subject to thermal inertia, or the speed of existing control equipment is limited, the response time of the thermometer can be relaxed.
Proper use of portable infrared thermometer
When measuring the temperature of an object to be measured with a portable infrared thermometer, the infrared thermometer should be pointed at the object to be measured, and ensure that the ratio of the measurement distance to the spot size meets the field of view requirements, not too close or too far. Then press the trigger button to read the measured temperature data on the instrument's LCD display. There are five important things to remember when using a portable infrared thermometer.
1Ambient temperature. If the infrared thermometer is suddenly exposed to an ambient temperature difference of 20°C or higher, allow the instrument to adjust to the new ambient temperature within 20 minutes.
2. Only measure the surface temperature of the object. Portable infrared thermometer cannot measure the internal temperature of an object
3. Pay attention to environmental conditions. Steam, dust, smoke, etc. will block the optical system of the instrument and affect accurate temperature measurement.
4. Locate hot spots. To find hot spots, first aim the instrument at the target, and then scan the target up and down until the hot spots are determined.
5. Portable infrared thermometer cannot measure temperature through glass. Glass has very special reflection and transmission characteristics and cannot provide accurate temperature readings, but it can measure temperature through the infrared window. It is best not to use infrared thermometers for temperature measurement on bright or polished metal surfaces (stainless steel, aluminum, etc.).
