Product news

The mid-infrared spectral range (MWIR, wavelengths between 3 µm and 5 µm) is of great interest for applications in industrial non-contact temperature measurement technology. Examples include measurements on ceramics and metals (spectral range 3 µm to 5 µm) or semiconductors (3.5 µm to 4.0 µm). Narrowband devices around 5 µm wavelength for temperature measurements on glass surfaces, around 4.6 µm (hot CO2), around 3.9 µm (measurements through flames) and around 3.4 µm (measurements on thin plastic films) are also important. Until now, thermopile infrared sensors were mainly used for these pyrometers, which only allowed relatively slow pyrometers (response times of 10 ms to 100 ms) due to their thermal time constant. The existing signal-to-noise ratio (specific detectivity D*) of the thermopile sensors also limits the achievable lower measuring temperature and the distance ratio (measuring distance/measuring field diameter) of the pyrometers.
Compared to thermopiles, current MWIR semiconductor photodiodes are significantly faster and more sensitive (higher D*). The devices developed with these detectors within the proven PYROSPOT series 10 achieve response times t95 of 1 ms at distance ratios of up to 130:1 and measuring temperature ranges between 30 °C and 1400 °C (3 µm to 5 µm), 75 °C to 1800 °C (3.5 µm to 4.0 µm), 75 °C to 2500 °C (around 5.0 µm) and 200 °C to 2500 °C (around 3.9 µm). The pyrometers of the series 10, with their aiming (laser/LED aiming light, through-lens sighting, color video module), a temperature linear output 0/4…20 mA, an RS-485 interface as well as a display and control buttons for display and parameterization, can be used universally for both industrial measuring tasks and in the R&D area.
For stationary use in harsh industrial environments, pyrometers in the PYROSPOT series 44 and 47 were also developed with the new MWIR photodiodes. They enable response times t95 from 5 ms at a distance ratio of 50:1 and temperature measurements from 20 °C to 1000 °C (3 µm to 5 µm), 50 °C to 1000 °C (3.5 µm to 4.0 µm), 50 °C to 2500 °C (around 5.0 µm) and 100 °C to 2500 °C (around 3,9 µm). These pyrometers are housed in robust stainless steel round housings and, in addition to the temperature linear output 0/4…20 mA, have a digital interface (Series 44: RS-485, Series 47: Ethernet) for data transmission and parameterization. All pyrometers with the new MWIR photodiodes begin with the type designation “DA”.

More information: https://dias-infrared.com/products/pyrometers