How to Determine Handheld Infrared Thermometer Optical Resolution and Signal Processing
Determine optical resolution
The optical resolution is determined by the ratio of D to S, which is the ratio of the distance D between the thermometer and the target to the diameter of the measurement spot S. For example, the handheld infrared thermometer Ti213 in the infrared era has a distance coefficient of 80:1. If it is 80 cm away from the target, the diameter of the measurement range is 1 cm. If the thermometer must be installed far away from the target due to environmental conditions, and small targets need to be measured, a thermometer with high optical resolution should be selected. The higher the optical resolution, that is, the higher the D:S ratio, the higher the cost of the thermometer.
Signal processing functions:
In view of the difference between discrete processes (such as parts production) and continuous processes, infrared thermometers are required to have multiple signal processing functions (such as peak hold, valley hold, average value) for selection, such as when measuring the temperature of bottles on a conveyor belt. To use peak hold, the temperature output signal is sent to the controller. Otherwise the thermometer reads a lower temperature value between bottles. If using peak hold, set the thermometer response time slightly longer than the time interval between bottles so that at least one bottle is always being measured.
Choosing an infrared thermometer can be divided into three aspects:
(1) Performance indicators, such as temperature range, spot size, working wavelength, measurement accuracy, window, display and output, response time, protective accessories, etc.;
(2) Environmental and working conditions, such as ambient temperature, windows, display and output, protective accessories, etc.;
(3) Other aspects of selection, such as ease of use, maintenance and calibration performance, and price, also have a certain impact on the choice of thermometer.
