Pyroelectric detector uses a differential mode of operation

Posted By : Enaie Azambuja
Pyroelectric detector uses a differential mode of operation

Pyroelectric detectors are susceptible to line interference and other sources of electromagnetic interference from non-detector related noise. Several manufacturers of OEM sensor devices use EMI filters to prevent these noise sources interfering with the operation of the device but for many gas detection applications a higher level of noise immunity is required.

LASER COMPONENTS has developed a new pyroelectric detector using a differential mode of operation ensuring that external pick up is eliminated greatly improving the electromagnetic immunity of the device. Pyroelectric crystals generate positive and negative charges on opposite faces of the crystal and using appropriate amplifi cation can generate a differential signal.

Differential operation results in a significant increase of the signal to noise ratio, this is because the output signal is doubled with this configuration while the noise only grows as the square root, the improvement in signal to noise is approximately 1.41 over a standard single ended pyroelectric detector.

The R&D team at LASER COMPONENTS designed our LD2100 with its use in electrically noisy environments in mind. These devices are used in NDIR and FTIR spectroscopy as well as flame and fire detection. The devices are inexpensive, robust and highly sensitive in the IR region of the spectrum.


You must be logged in to comment

Write a comment

No comments

Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

Southern Manufacturing & Electronics 2019
5th February 2019
United Kingdom Farnborough
embedded world 2019
26th February 2019
Germany Nuremberg
Wearable Tech Show 2019
12th March 2019
United Kingdom London
AMPER 2019
19th March 2019
Czech Republic Brno Exhibition Centre