1. Sensor Division
  2. Pyroelectric Detectors
  3. PYROMID® Multi Channel Detectors
Miniaturised Detectors for Gas Analysis and Flame Detection

PYROMID® Multi Channel Detectors

The PYROMID® brand stands for infrared detectors with compact stack design, the LRM detector family, as well as multi channel detectors with internal beam splitters, in particular for gas analysis and flame detection.

Features of PYROMID® multi channel detectors from InfraTec

  • Multi channel detectors with up to eight channels

  • Integrated beam splitter or micromechanical frame

  • Easy integration into measurement devices

  • For use in gas analysis and flame detection

PYROMID® Multi Channel Detectors
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PYROMID detectors
Type
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Number of measuring channels
Number of Channels
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TO18, TO46: 5.4 mm in diameter
TO5, TO39: 9.2 mm in diameter
TO8: 15.2 mm in diameter

Housing
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Size of the circular or rectangular aperture through which radiation hits the sensitive elements.
Aperture (mm)
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Voltage Mode: The pyroelectric current is initially converted into a voltage by an RC network followed by a conversion to lower impedance.

Current Mode: The pyroelectric current is permanently compensated by an OpAmp. The current required for this generates a voltage drop across an RC network in the feedback path which serves as the measurement signal.

Operating Mode
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Integrated signal condition like integrated junction field effect transistors (JFET) for detectors in voltage mode or integrated operational amplifiers (OpAmp) for detectors in current mode.

Amplifier
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A pyroelectric detector is sensitive to changes in temperature. Changes in ambient temperature have an influence on the measurement signal and shifts the operating point. This effect reduces a thermal compensation. Therefore, each pyroelectric element gets an additional optically inactive element, which compensates for unwanted currents.

Thermal Compensation
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Patented micromechanical chip attachment (LowMicro) by InfraTec to reduce the effects of interfering impact sounds.

Low Micro
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As a key parameter, the specific detectivity D* characterizes the signal-to-noise ratio of infrared detectors.

Specific Detectivity*
LRM-274
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Single supply operation

4TO8

8.5 × 8.5

Current ModeOpAmp

4.0

LRM-278
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single supply operation

8TO8

8.5 x 8.5

Current ModeOpAmp

4.5

LIM-032
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Integrated Beam Splitter

2TO39

2.8 x 2.8

Voltage ModeJFET

2.9

LIM-011
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Integrated Beam Splitter

4TO8

2.8 x 2.8

Voltage ModeJFET

0.8

LIM-054
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Integrated Beam Splitter

4TO8

2.8 x 2.8

Current ModeOpAmp

0.42

2TO18 / TO46

3.0 x 2.0

Voltage ModeJFET

4.0

2TO18 / TO46

3.0 x 2.0

Voltage ModeJFET

2.0

4TO39

5.0 x 5.0

Voltage ModeJFET

4.7

LRM-284
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Single supply operation

4TO39

5.0 x 5.0

Current ModeOpAmp

4.5

LRM-244
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single supply operation

4TO8

8.5 x 8.5

Current ModeOpAmp

6.0

2TO18 / TO46

3.0 x 2.0

Current ModeOpAmp

3.0

LIM-082
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Integrated Beam Splitter

2TO39

2.8 x 2.8

Current ModeOpAmp

1.9

* in 108 cm√Hz/W (500 K, 10 Hz, 1 Hz BW, 25°C, without window)

** in 108 cm√Hz/W (500 K, 1 kHz, 1 Hz BW, 25°C, without window)

*** bei Rfb = 128 GΩ, Cfb=200 fF

**** in 108 cm√Hz/W (500 K, 1 kHz, 1 Hz BW, 30 °C, without window)

LRM Detectors

Miniaturised Multi Channel Detectors with Compact Stack Design

Cutting Edge Tech­no­logy in Most Confined Spaces

LRM detectors by InfraTec, a series of miniaturised multi channel detectors, offer an extremely wide field of view (FOV) in combination with a compact design and attractive pricing. Their most obvious hallmark is a robust central window in the cap, e.g. made of silicon. It offers reliable protection against environmental influences such as penetrating moisture. Optionally soldered to the housing this central window enables complete hermetic sealing.

Innov­ative Modular Stack Design

The channel filters are placed inside the detectors. Shielded from mechanical stress as well as from other strains from harsh environments they are located close to the pyroelectric elements. The reduced distance and the central window integrated into the detector caps are two of the factors that ensure a wide FOV. At the same time, all elements are placed close together inside the detectors. This allows more radiation to reach the pyroelectric element and therefore a higher signal. In addition, since the optical crosstalk of the individual channels is suppressed very effectively, the entire detector series proves to be extremely powerful. The compact, miniaturised construction allows for more analysis channels with unchanged package size. Or, the same number of channels can be integrated into significantly smaller packages.

PYROMID® multi channel detectors from InfraTec
PYROMID® multi channel detectors from InfraTec

High-tech in the Smal­lest Space

The LRM-292 pyroelectric detector from InfraTec is, next to the LRM-202, the world‘s smallest multi-channel detector with integrated operational amplifier and thermal compensation. With a diameter of only 4.7 mm, the LRM-292 is predestined for measuring low gas concentrations at small measurement volumes. Fast gas changes, low gas concentrations, and short gas exchange times are not a challenge for the pyroelectric detector in a compact TO46 housing.

The LRM-292 and LRM-202 owe their compact design to the tried-and-tested stacked construction method. Its unique design means that both detectors have a field of view (FOV) of 60°, exposing a very large proportion of the radiation to the pyroelectric elements. This generates high amplitudes of the output signal, which supports external signal amplification.

LRM-292 - Small Multi Channel Detector with Current Oper­a­tion

In the LRM-292, two integrated operational amplifiers are connected as transimpedance amplifiers. The current mode produces higher output signals than the LRM-202 in voltage mode. This simplifies signal processing and provides an excellent signal-to-noise ratio even at frequencies above 10 Hz. Additionally, the LRM-292 has been designed to use only one supply voltage, thereby reducing the amount of circuitry required.

Further details about LRM-292

LRM Detectors at a Glance

  • Assortment of two, four and eight channel detectors

  • Operation in voltage mode or current mode

  • Extremely wide FOV provides powerful performance

  • TO46, TO39 and TO8 housings available

  • Robust central window for protection against penetrating moisture

  • Option for complete hermetic sealing

  • Available with thermal compensation

Technical Article

Compact Pyro­elec­tric Detectors Based on Micro-machined Chip Carriers

A miniaturized multi channel detector differs in many ways from a more conventional multi-channel detector. For example, it features special chip carriers. The influence of such elements on the performance of these special detectors is clearly illustrated in this technical article.

Planar multi channel pyroelectric detectors from InfraTec

Beam Splitter Detectors

Precise and Stable Measurements for Long-term Applications

Uncon­ven­tional Solu­tion for Precise Meas­ure­ments

Beam splitter detectors are perfectly suited for measurement tasks that demand accurate and stable measurement results over the long term. These multi channel detectors are equipped with only a single aperture. They contain an array of micro mirror surfaces working as an internal beam splitter. Due to the detector’s single aperture opening, major parts of the incoming radiation impinges reflectively to the pyroelectric crystal. This allows for very precise NDIR gas analysis particularly in gas detection technology. To solve such measurement tasks, a gas cell with an effective diameter of just 2.5 mm is sufficient. Apart from an accelerated exchange of gas, this results in very low dead volumes of the measuring system. Measurement devices equipped with the detector can be correspondingly smaller. The permanently stable signal ratio between the individual channels ensures a high degree of measurement accuracy.

One of a Kind – Reflec­tion Beam Splitter

The beam splitters used by InfraTec are solely reflection beam splitters and consist of highly reflective gold plated microstructures. The division of the beam into two or four spectral channels is done only within the detector.

The radiation entering through the aperture opening of the detector is split into several radiation beams of equal intensity but in different, predefined directions within the detector based on the architecture of the innovative microstructure inside. Each of the beams impinges on a corresponding pyroelectric sensor element with an upstream optical filter.

Mechanical expansions in the optical system of the measurement device, ageing effects or any possible contamination of these detectors are already accounted for before the beam is split and thus affect all channels equally. This minimises differences between the measurement channels and the required beam diameter. The microstructures vary according to the detector type. In quad channel detectors these resemble four-sided micro-pyramids, whereas in dual channel detectors these are V-shaped grooves.

PYROMID® multi channel detectors from InfraTec
PYROMID® multi channel detectors from InfraTec

Advant­ages of Beam Splitter Detectors

  • Multi channel detectors with a single aperture

  • High degree of measurement accuracy due to a permanently stable signal ratio between the individual channels

  • Simple constructive solutions allow exact same reflected intensities of the individual radiation beams

  • Very low dead volumes of the measurement systems

  • Small gas cells enable easy integration into measurement devices

Miniaturised Detectors for Gas Analysis and Flame Detection

PYROMID® Brochure

Get further information about miniaturised detectors for gas analysis and flame detection.

InfraTec PYROMID Flyer
PYROMID® multi channel detectors from InfraTec

How Does a Pyro­elec­tric Detector Work?

Pyroelectric crystals have a rare asymmetry due to their single polar axis. This causes their polarisation to change with temperature. This so-called pyroelectric effect is used in sensor technology. For this, a thin pyroelectric crystal is coated perpendicular to the polar axis with electrodes. On the upper electrode of the crystal, an absorbing layer (black layer) is applied. When this layer interacts with infrared radiation, the pyroelectric layer heats up and surface charge arises. If the radiation is switched off, a charge of the opposite polarity originates. However, the charge is very low. Before the finite internal resistance of the crystal can equalise the charges, extremely low-noise and low leakage current field-effect transistors (JFET) or operational amplifier (OpAmp) convert the charges into a signal voltage.

Contact to sensir division of InfraTec

Would You Like to Know More?

It is not unusual for tasks to be associated with special requirements. Discuss your specific application needs with our experienced engineers, receive further technical information or learn more about our additional services.

United Kingdom & Irland
InfraTec GmbH Infrarotsensorik und MesstechnikGostritzer Straße 61 - 6301217 DresdenGERMANY

Further Details about PYROMID® Multi Channel Detectors

LIM‐082 - beam splitter detector in current mode

The LIM‐082 – A Detector That Sets New Standards

With the LIM‐082, for the first time InfraTec offers a beam splitter detector in a TO39 housing in current mode. In addition to the internal beam splitter, the latest model in the PYROMID® series also has an integrated operational amplifier.

PYROMID® multi channel detector LRM-254 from InfraTec

LRM-254

As the first representative of the LRM series, the LRM-254 marks the starting point for all other models. The miniaturized four channel detector in a TO39 housing with an square aperture opening of 5 mm has the typical features of this product series: cap with central window, channel filters inside the detector, miniaturized stack design, large FOV.

PYROMID® multi channel detector LRM-292 from InfraTec

LRM-292

The LRM-292 pyroelectric detector from InfraTec is, next to the LRM-102 and the LRM-202, the world‘s smallest multi-channel detector with integrated operational amplifier and thermal compensation. With a diameter of only 4.7 mm, he is predestined for measuring low gas concentrations at small measurement volumes. Fast gas changes, low gas concentrations, and short gas exchange times are not a challenge for the LRM-292 in a compact TO46 housing.

PYROMID® multi channel detector LRM-202 from InfraTec

LRM-102 and LRM-202

In the range of the miniaturised LRM series, the LRM-102 and the LRM-202 are two detectors with compact design. Both dual channel detectors are integrated in TO46 housings. Their aperture opening has a size of approximately 6 mm2 each. As a solution e.g. for gas analysis and leakage detection, they can be used in stationary and mobile devices ranging from medicine to safety technology.

PYROMID® multi channel detector LRM-244 from InfraTec

LRM-244

An enormous field of view (FOV) distinguishes the LRM 244 from other detectors of the LRM series. The extremely large, symmetrical field of view of the detector of more than 90 degrees enables flames to be detected within the greatest possible angular range. In addition to this, pyroelements, each with a particularly large sensitive surface of 2 × 2 mm2, ensure an ideal signal-to-noise ratio.

PYROMID® multi channel detector LRM-284 from InfraTec

LRM-284

On the market there are only a few miniaturized multi-channel detectors operating in current mode. Therefore the LRM-284 is definitely something special. The current mode of the single supply detector is enabled by two double-operational amplifiers. This detector allows the design of an analyser with low power consumption – a fact which particularly speaks for the operation of the detector in portable devices.

PYROMID® multi channel detector LRM-278 from InfraTec

LRM-278

The LRM-278 is the world's first detector of its kind to combine eight measurement channels in a TO8 housing with a diameter of 15.2 millimetres and operates in current mode. It also incorporates a temperature sensor. Measuring the temperature inside the detector, for example, provides the option of compensating the typical temperature drift of the filters very accurately by means of a calibration.

PYROMID® multi channel detector LRM-274 from InfraTec

LRM-274

As a specialist in flame detection technology the LRM-274 expands the range of detectors, that are characterized by a field of view wider than 90˚. The low-power detector requires only one unipolar supply voltage and is particularly suitable for operation in industrial fire protection and early fire detection devices. Due to its integrated heating resistors users themselves can test the detector if necessary.

LIM‐082 - beam splitter detector in current mode

The LIM‐082 – A Detector That Sets New Standards

With the LIM‐082, for the first time InfraTec offers a beam splitter detector in a TO39 housing in current mode. In addition to the internal beam splitter, the latest model in the PYROMID® series also has an integrated operational amplifier.

PYROMID® multi channel detector LRM-254 from InfraTec

LRM-254

As the first representative of the LRM series, the LRM-254 marks the starting point for all other models. The miniaturized four channel detector in a TO39 housing with an square aperture opening of 5 mm has the typical features of this product series: cap with central window, channel filters inside the detector, miniaturized stack design, large FOV.

PYROMID® multi channel detector LRM-292 from InfraTec

LRM-292

The LRM-292 pyroelectric detector from InfraTec is, next to the LRM-102 and the LRM-202, the world‘s smallest multi-channel detector with integrated operational amplifier and thermal compensation. With a diameter of only 4.7 mm, he is predestined for measuring low gas concentrations at small measurement volumes. Fast gas changes, low gas concentrations, and short gas exchange times are not a challenge for the LRM-292 in a compact TO46 housing.

PYROMID® multi channel detector LRM-202 from InfraTec

LRM-102 and LRM-202

In the range of the miniaturised LRM series, the LRM-102 and the LRM-202 are two detectors with compact design. Both dual channel detectors are integrated in TO46 housings. Their aperture opening has a size of approximately 6 mm2 each. As a solution e.g. for gas analysis and leakage detection, they can be used in stationary and mobile devices ranging from medicine to safety technology.

PYROMID® multi channel detector LRM-244 from InfraTec

LRM-244

An enormous field of view (FOV) distinguishes the LRM 244 from other detectors of the LRM series. The extremely large, symmetrical field of view of the detector of more than 90 degrees enables flames to be detected within the greatest possible angular range. In addition to this, pyroelements, each with a particularly large sensitive surface of 2 × 2 mm2, ensure an ideal signal-to-noise ratio.

PYROMID® multi channel detector LRM-284 from InfraTec

LRM-284

On the market there are only a few miniaturized multi-channel detectors operating in current mode. Therefore the LRM-284 is definitely something special. The current mode of the single supply detector is enabled by two double-operational amplifiers. This detector allows the design of an analyser with low power consumption – a fact which particularly speaks for the operation of the detector in portable devices.

PYROMID® multi channel detector LRM-278 from InfraTec

LRM-278

The LRM-278 is the world's first detector of its kind to combine eight measurement channels in a TO8 housing with a diameter of 15.2 millimetres and operates in current mode. It also incorporates a temperature sensor. Measuring the temperature inside the detector, for example, provides the option of compensating the typical temperature drift of the filters very accurately by means of a calibration.

PYROMID® multi channel detector LRM-274 from InfraTec

LRM-274

As a specialist in flame detection technology the LRM-274 expands the range of detectors, that are characterized by a field of view wider than 90˚. The low-power detector requires only one unipolar supply voltage and is particularly suitable for operation in industrial fire protection and early fire detection devices. Due to its integrated heating resistors users themselves can test the detector if necessary.

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

Further Pyroelectric Detectors from InfraTec

PyrIQ infrared detector

PyrIQ - Digital Detectors

We are introducing PyRIQ: our digital detectors for easy system integration with variable signal processing and improved electromagnetic compatibility (EMC).

Planar multi channel pyroelectric detectors from InfraTec

Planar Multi Channel Detectors

Choice between different standard planar multi channel detectors

  • Two, three or four spectral channels in one housing

  • Individually customizable, e.g. with option for JFET, operational amplifier etc.

PYRONEER-High-Performance-Detectors - Group

PYRONEER – High-Performance Detectors

Detectors based on LiTaO3 or DLaTGS for analytical instruments and spectroscopy.

  • High performance

  • Flat spectral response

  • Precious metal black coating

Single channel detectors from InfraTec

Single Channel Detectors

Single-channel for gas analysis, flame detection and radiometry.

  • TO18 or TO39 housing

  • Thermal compensation

  • JFET or CMOS amplifier