Principle and operation of laser-type high-temperature probes
Laser high-temperature probe principle and mode of operation: in accordance with the physical form can be divided into two categories, one for the split online infrared thermometer, an integrated online infrared thermometer. On-line pyrometer and fibre-optic infrared thermometer is the most advantageous (split), and easy to install, the use of low-cost.
Infrared temperature measurement principle
Any object will emit infrared radiation to the outside according to its surface temperature, the intensity of the radiation changes with the temperature of the object. For different target temperatures, different infrared thermometer to choose a different measurement wavelength for temperature measurement. Usually 1.6um wavelength is used to measure the target temperature from 600℃ to 1400℃. Non-contact temperature measurement is the biggest advantage of infrared thermometers, so that users can easily and quickly measure difficult to access or moving objects.
Installation Distance and Measurement Dimensions
For example: JTCSG1400 optical resolution is 100:1, the corresponding measurement field of view can be approximated by referring to the attached optical path diagram. In order to improve the measurement accuracy, the measurement should ensure that the size of the target to be measured is larger than the measurement field of view, especially when the target or the thermometer has a wobbly site.
High temperature radiation
Try to avoid aiming the infrared pyrometer directly at high-temperature targets far beyond the measurement temperature range, such as the sun, high-temperature hearths, etc., during installation. Also pay attention to avoid high temperature sources in the vicinity of the target generated by the reflection of the impact on the measurement accuracy.
On-line pyrometer, mostly used in industrial production site online temperature measurement, the production line of a certain part of the real-time temperature measurement and transmission / display in the control room, or even directly involved in closed-loop control. Such thermometers are generally required to have long-term stability and reliability.
Principle of operation: the infrared radiation emitted by the target object is collected by the optical probe, and focused by the probe to the head of the infrared fibre optic, which transmits the infrared signal to the sensor, which is converted into an electrical signal, processed by the subsequent processing circuit and displayed on the instrument box, and at the same time, it can be involved in the closed-loop control of the production through digital communication or 4-20mA output. Current intelligent instruments can set their own upper and lower limit alarms, generate action signals, and participate directly in the control.
