เซนเซอร์วัดอุณหภูมิชนิด 2 - Color Sensors, Ratio Pyrometer, radiation signal, emissivity

Two-Color- or Ratio- Pyrometers are typical names for pyrometers which measure temperatures from the ratio of radiation signals of two adjacent wavelengths as opposed to measuring the absolute intensity like single wavelength units do. The advantages for customers are the following:

• Gray bodies, i.e., targets with the same emissivity on both wavelengths, can be measured without emissivity setting.
• There is automatic compensation for dust, smoke or a dirty viewing window between pyrometer and target.
• Temperature errors are minimized if the target is too small or moving and the field of measurement can’t be completely covered.

Two Color, Ratio, Dual Wavelength THERMOMETERS

• Measure the weighted peak temperature in the field of view.
  • Tolerate up to 99% blockage of the IR Sensor’s cone of vision
  • Unaffected by dust and other contaminants in the field of view
  • Unaffected by moving targets within the field of view
  • Unaffected by dirty viewing windows
• Independent of target emissivity (generally)
• Low temperature measurements starting at 300° C 

ตารางเปรียบเทียบการทำงานของเซนเซอร์ตรวจจับความร้อนทั้งสองแบบ