LID-2322 – The new digital detector from InfraTec Two channels with digital interface – for easy integration and precise measurements Envirotech Online

InfraTec’s analog pyroelectric detectors have been used in a number of different customer applications for over 30 years. These have now been joined by a new range of digital pyroelectric detectors called PyrIQ. In addition to the 4-channel detector, InfraTec has also developed the LID-2322: a compensated 2-channel detector in the TO39 housing which is primarily intended for gas analysis devices.

Compact Design – Versatile Applications

The two-channel LID-2322 is ideal for mobile devices thanks to its small and compact housing and can also be operated on batteries. It is suitable for use in different applications, for example in harsh environments, as the optional thermal compensation reduces the effect of external fluctuations. The integrated I²C communication interface up to 1 MHz makes it possible to immediately read the measured values ​​via a PC or a microcontroller in a reliable and standardized way. In addition to the power supply connections, only two additional connections are necessary for the operation of the detector to allow its configuration and its reading. This minimizes external hardware requirements and greatly facilitates the integration of the detector into the application. The use of the additional clock input makes it possible to synchronize the clock of the radiator and that of the detector, which allows a very precise evaluation of the signal with a stable frequency.

Special features of the digital detector

Like all detectors from InfraTec, the digital detector is based on lithium tantalate (LiTaO3) as the sensor material. Unlike other materials, LiTaO3 offers good signal-to-noise ratio and high sensitivity without additional cooling or temperature stabilization. All internal signal processing is performed by an ASIC (Application Specific Integrated Circuit). The signal generated by the pyroelectric elements is amplified in this circuit and then digitized with a
16-bit A/D converter. Unlike analog detectors, this allows flexible configuration of detector parameters to optimize signal processing. Spatial concentration and shielding of the entire detector signal conversion provides better electromagnetic compatibility (EMC). Another special feature is the “fast recovery after saturation” function. This function detects the override due to a faulty operating state or an external override and automatically resets the analog input stage within milliseconds. This significantly reduces the time it takes for a measuring system to be ready for use again after start-up or after temperature changes.

Overall, the LID-2322 offers excellent flexibility and functionality combined with easy system integration into the standard TO39 package.