Signal-to-Noise Ratio Significantly Increased - Pyroelectric Detectors with a Differential Amplifier

06 Jun 2017

At Sensor+Test 2017, LASER COMPONENTS will introduce a new and improved

pyroelectric detector, the LD2100 series with differential outputs.

Pyroelectric crystals simultaneously generate positive and negative charges on

opposite faces, and our LD2100 detectors exploit this with a new amplification

scheme.

The LD2100 series is based on our best-selling L2100 series CM current mode

detector, and we plan to bring other differential versions of our detectors to market in

due course.

The R&D team at LASER COMPONENTS Pyro Group reached deep into their bag

of tricks to produce a pyroelectric detector that not only gives you double the signal

compared to a single ended detector when used with a differential amplifier, but the

noise only increases by √2. This produces an improvement in signal to noise ratio of

around 1.4.

Pyroelectric detectors with a differential amplifier have two additional advantages:

External interference signals are eliminated by signal subtraction. Thus, they can

be used in critical environments with electric fields. Furthermore, the LD2100 series

makes simple wiring possible, with which the signal outputs are connected directly to

the inputs of the differential AD converter.

Pyroelectric detectors are used in NDIR and FTIR spectroscopy, IR laser-based

measurement technology, pyrometry, and in flame and fire detection: The components

are inexpensive, reliable, robust, and are highly sensitive from short to long IR

wavelengths as thermal detectors.

More Information http://www.lasercomponents.com/uk/product/differential-pyroelectric-detector/