Multichannel Spectral Pyrometer
MultiChannelSpectral Pyrometer (MC‐SP) is designed to replace traditional temperature sensors as thermocouples, thermoresistorsetc. for high(> 600 oC) temperature areas in presence of strong electromagnetic fields; application examples are: microwave heating, high voltage equipment, intensive electromagnetic interference (EMI) environment and so on.
Optical system of Spectral Pyrometer collects light irradiation from the bottom of standard Ceramic Thermocouple Protection Tube, transfers it by fiber optics to MEMS (microelectromechanicalsystems) –based multichannel optical switch and then into a spectrophotometer. The temperature is defined as a parameter of the detected spectral distribution in visible/near‐infrared range by direct fitting the data of the spectrophotometer to Planck's law.
This design of MC‐SP allows measured the temperature profiles (up to 24 or more measurement points) in the temperature range 600 oC‐2300 oCwith accuracy of 1%, to keep the calibration parameters over long time of operation.
Key distinctive features/advantages of MC‐SP are:
- Be able to work where others cannot –at microwave oven, under high voltage potential etc.
- Long‐term stability, the reading does not depend of optical signal amplitude and then from contamination/degradation/misalignment of optical parts.
- High temperature operation, upper bond is limited by protection tube material.
Technical and economical advantages:
- Be able to work where others can not –at microwave oven, under high voltage potential etc.
- Has the identical with industry standard dimensions/fittings of sensors.
- Long‐term stability, the reading does not depend of optical signal amplitude and then from contamination/degradation/misalignment of optical parts.
- High temperature operation, upper bond is limited by protection tube material.
- Not subject to erosion –ceramic only immersed part.
- Multichannel PID (proportional‐integral‐derivative)–regulator could be included easily.
- At the same conditions, the cost of MC‐SP may be compared with advanced thermocouple equipment.
