Two-Channel Digital Detector Provides Precise Measurements

InfraTec's compact, ruggedized LID-2322 digital detector offers excellent flexibility and functionality combined with easy system integration in the standard TO39 housing. By DA Editor / 20 May 2022

InfraTec has announced the development of a new pyroelectric detector; the LID-2322.

Analogue pyroelectric detectors from InfraTec have been used in a number of different applications for over 30 years. Alongside 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 run on batteries. It is suitable for use in harsh environments, as the optional thermal compensation reduces the effect of external fluctuations. The integrated I²C communication interface with up to 1 MHz (fast mode plus – FM+) enables the measured values to be read out immediately via a PC or microcontroller in a reliable, standardized manner.

Apart from the power supply connections, only two additional connections are required for operation of the detector to allow it to be parameterized and read out. This keeps the external hardware requirements to a minimum and makes it much easier to integrate the detector into the application. Using the additional clock input makes it possible to synchronize the radiator and the detector clock, allowing highly precise signal evaluation 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 sensor material. In contrast to other materials, LiTaO3 offers a good signal-to-noise ratio and high sensitivity without additional cooling or temperature stabilization. All of the internal signal processing is carried out 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. In contrast to analog detectors, this allows the detector parameters to be flexibly configured in order to optimize the signal processing.

The spatial concentration and shielding of the entire signal conversion and, in particular, the interference-prone analogue lines of the detector offer improved electromagnetic compatibility (EMC). Another special feature is the “fast recovery after saturation” function. This function detects the override due to a defective operating status or external override and automatically resets the analog input stage within a few milliseconds. This significantly reduces the time it takes for a measuring system to be ready for use again after starting or after temperature changes.

Posted by DA Editor Connect & Contact

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