Pyreos MIR sensors

Introduction

Pyreos, a company founded on an original patent by Siemens for thin film MIR sensing, offers both analog and digital uncooled sensors in the Mid Infra Red (MIR) wavelengths between 2.5 and 12 micro meters. This post summarises the Pyros sensors and links to online resources. Note that Pyreos does not offer any emitters. MIR emitters are listed in the posts on Thermal emitters and Microhybrid IR.

Filters

The actual sensor is, I think, the same in all Pyreos products. It is the filter that differs. The list below summarises the filters available in March 2022.

CWL µm	(HPB nm)	Use
2.55	90	-
2.9	300	-
3.3	160	CH4
3.33	160	H-C
3.38	190	H-C
3.7	110	Reference
3.9	200	N2O
3.91	90	Reference
4.26	180	CO2
4.43	60	CO2 (Special)
4.64	90	CO
4.64	180	CO (Narrow)
4.85	90	-
4.9	130	Reference
5.3	180	NO
5.6	80	Milk, Reference
5.73	80	Milk, Fat
6.2	200	NO2
6.46	130	Milk, Protein
6.7	120	Milk, Reference
7.3	200	SO2
8.01	440	-
8.42	180	Refrigerants, Anaesthetics
8.55	180	Anaesthetics
8.75	220	Anaesthetics
8.95	330	Refrigerants
9.5	400	Sugar, Ethanol
9.61	150	Milk, Lactose, Sugar
9.65	220	Anaesthetics
10.27	210	-
12.23	210	Anaesthetics

Analog sensors

The analog sensors are packages as TO39 single, dual and quad channel uncooled precision IR detectors. Available filters are listed by application and wavelength. Some of the filters, and filter combinations, are offered as pre-configured standard products. For example via Mouser, also available in Mouser Sweden. The figure below illustrates the design of the Pyreos single, dual and quad IR detectors.

Pyreos single, dual and quad cell MIR sensors.

Digital Sensors

The digital sensor units are available as smaller size (5.6 x 3.7 x 2.8 mm) surface mount devices (SMDs). They are available as single or dual SMD units.

Pyreos single and dual analog SMD MIR sensors.

Linear arrays

Pyreos also offers linear element line sensor arrays including a metal casing and integrated read-out electronics. When writing this, March 2022, the following arrays and filters are offered:

Array	filter	range
128	LVF	2.5 - 5
128	LVF	5.5 - 11
255	custom	custom
510	custom	custom

Applications

Applications and case studies of the Pyroes family of sensors.. A more practical Do-It-Yourself guide, including links to different products is the Pyreos article Guide to building mid-infrared spectral analysis system using Pyreos technology (milk example).