Inter­fer­ence Filter

Interference filters are components, which can be specified well for this filter capacity.

The wavelength selectivity of an interference filter is generated by elimination in numerous thin dielectric layers (often lambda/4-layers). Common designs are the bandpass, longpass and antireflection coating. Typical characteristics of an in interference filter are the transmission, central shaft length, bandwidth and blocking.

Interference filter from InfraTec

Inter­fer­ence Filters for Gas Analysis and Flame Detec­tion

Gas analysis identifies and quantifies the components of gas mixtures. It uses narrow-band (100 ... 200 nm bandwidth) interference filters (narrow band pass – NBP). Flame sensor technology uses wider band passes (band pass – BP; bandwidth up to 600 nm) than the gas analysis, to induce higher signal voltages when measuring flames from greater distances, with the compromise of losing selectivity. Analytic measuring procedures use external optical elements for spectral selection. These infrared detectors are often equipped with a crystal window, for instance a potassium bromide window. Alternatively, the application of significantly more environmentally resistant silicon- and germanium substrate is possible. However, they have to be furnished with an antireflection coating (ARC) on both sides.

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Wide-Ranging Applic­a­tions of Inter­fer­ence Filters

Contact-free temperature measuring (pyrometry) commonly uses the so-called first 3 … 5 µm and second 8 … 14 µm atmospheric windows for their spectral range, since environmental impacts, such as atmospheric water vapour, can lead to signal attenuation and therefore to measuring errors, especially at longer measuring distances. Interference filters in bandpass-design with a width of several micrometers (wide band pass – WBP) are generally used.

Infrared filters from InfraTec

Detector Search

InfraTec offers different product groups including approximately 50 standard pyroelectric detectors. Detectors with reduced microphone technology and integrated operational amplifier as well as digital detectors are part of our product range.

Choose your suitable infrared detectors with the help of our detailed detector search.

Sensor division InfraTec detectors overview

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Infrared Detector – IR Detector

Infrared detectors (also called infrared sensors or pyroelectric detectors) are optoelectronic components and represent the core element of gas analyzers, flame sensors, devices of spectral analysis, as well as non-contact temperature measurement.

Infrared sensors from InfraTec

Infrared Sensor – IR Sensor

An infrared sensor (IR sensor) is a radiation-sensitive optoelectronic component with a spectral sensitivity in the infrared wavelength range 780 nm … 50 µm. IR sensors are now widely used in motion detectors, which are used in building services to switch on lamps or in alarm systems to detect unwelcome guests.

InfraTec prism - Picture Credits: © iStock.com / ktsimage

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Sensor division InfraTec detectors overview

Infrared Detector – IR Detector

Infrared detectors (also called infrared sensors or pyroelectric detectors) are optoelectronic components and represent the core element of gas analyzers, flame sensors, devices of spectral analysis, as well as non-contact temperature measurement.

Infrared sensors from InfraTec

Infrared Sensor – IR Sensor

An infrared sensor (IR sensor) is a radiation-sensitive optoelectronic component with a spectral sensitivity in the infrared wavelength range 780 nm … 50 µm. IR sensors are now widely used in motion detectors, which are used in building services to switch on lamps or in alarm systems to detect unwelcome guests.

InfraTec prism - Picture Credits: © iStock.com / ktsimage

Infrared Radiation – IR Radiation

Infrared radiation describes electromagnetic waves in the spectral range between visible red light and longer-wave microwave radiation.