Multi-channel LiTaO3 Pyroelectric Detectors

Multi-Color Detectors

Multi-channel pyroelectric detectors (multi-color detectors) are mostly used for gas analysis. Aside from a reference filter, each measurement channel is tuned to a gas absorption line by integrating a bandpass filter. The gas concentration is calculated by applying the Beer-Lambert law. A reference channel improves the long-term stability of the measurement.

Laser Components offers a wide variety of standard bandpass filters for gas analysis (e.g., CO₂, CO, NO₂, SO₂, and hydrocarbons) and reference purposes.
In our datasheet on filters you will find the corresponding filters. Additional filters are available upon request.

Current Mode Pyrodetectors - CM Mode

The same fundamental principles apply to both multi-channel and one-channel detectors in current mode. The detectors in current mode are particularly easy to integrate into systems; in fact, it is almost identical to Plug&Play integration.

The most compact detector is the three-channel version in a TO-39 housing!

The following product lines are available:

Two-channel detectors with filters
L12 and L22 series
Three-channel detectors with filters
L13 and L23 series
Four-channel detectors with filters
L14 and L24 series

Fields of Application

Pyroelectric detectors can be used for:

Medical gas analysis such as breath gas analysis
Industrial gas analysis
Flame detection
Hydrogen flame detection

Datasheets

Supplier

Chapter Navigation

Our IR Detectors

Panchromatic, photoconductive and thermal detectors

InGaAs PIN Photodiodes

Modern InGaAs PIN photodiodes are panchromatic and convert broadband light to photocurrents in the Vis-NIR range. Concretely speaking, this means a sensitivity range from 500 nm to 1700 nm for regular InGaAs and – in increments – up to 2600 nm for extended InGaAs. Variations for data transmission are not panchromatic.

PbS and PbSe Detectors

PbS is a standard SWIR semiconductor detector (1 - 3.3 µm) whereas PbSe is used in the MWIR range (1 - 4.7 µm when uncooled; up to 5.2 µm when cooled). Our lead salt detectors are photoconductive; the detector resistance is reduced during illumination. The crystal structure is polycrystalline and is produced via chemical deposition.

Pyroelectric IR Detectors

A pyroelectric IR detector is a thermal detector in that it responds to the change in heat (IR) absorbed on its surface. Thermal detectors are polychromatic with a very wide spectral bandwidth.

The nature of the pyroelectric effect is that in a highly-ordered crystal (or ceramic), a temperature change in the element causes its atoms to move slightly out of position. This rearranges its electrical charge, which is measured in the electrodes on its surface.

The pyroelectric effect is found in many materials. The most commonly-used materials are deuterated lanthanum α alanine-doped triglycine sulfate (DLaTGS) and lithium tantalate (LTO).