New fast pyrometers for non-contact temperature measurement in the mid-infrared spectral range

Fast pyrometers PYROSPOT DA 44G and DA 44F
Fast pyrometers PYROSPOT DA 44G and DA 44F

The mid-infrared spectral range (MWIR, wavelength between 3 µm and 5 µm) is of particular interest for applications in industrial non-contact temperature measurement. Examples are narrow band pyrometers around 5 µm wavelength for glass temperature measurement, around 3.9 µm (measurements through flames) and around 3.4 µm (measurements on thin plastic films). Broadband MWIR pyrometers are suitable for example for measurements on metals and ceramics (3 µm to 5 µm) or semiconductors (3.5 µm to 4.0 µm). Among others, thermopile infrared detectors have been used in these pyrometers. Consequently, due to the thermal time constants, only relatively slow pyrometers (response time between 10 ms and 100 ms) are possible.

Faster response times

DIAS Infrared is now expanding its range of PYROSPOT pyrometers, which are faster and more sensitive in the mid-infrared spectral range. This is possible through the use of new MWIR detectors. The first devices to come onto the market are the pyrometers PYROSPOT DA 44G for glass temperature measurement (around 5 µm, measurement temperatures from 50 °C to 2500 °C) and DA 44F for measurements through flames (around 3.9 µm, 100 °C to 2500 °C), DA 44M for general measurements in the MWIR spectral range (3 µm to 5 µm, 20 °C to 1000 °C) and DA 44MF as a special device for the semiconductor industry (3.5 µm to 4.0 µm, 50 °C to 1000 °C). The response time (t95) is only 5 ms.

These new PYROSPOT pyrometers have been presented for the first time in 2019 at the trade fairs Sensor+Test (Nuremberg) and Thermprocess (Düsseldorf). The new pyrometer DA 10G with a response time (t95) of just 1 ms is here also shown for very fast temperature measurements on glass (around 5 µm, 75 °C to 2500 °C).

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