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Find out more about our custom infrared gas cells
Call +44 (0)1622 859444 Call +1 401 583 7846Knight Optical is the go-to supplier for an array of gas cells and infrared gas cells that serve as wavelength references or are used in chemical analysis.
These cells are essential components in spectroscopic instruments, including Fourier transform infrared (FTIR) spectroscopy and laser absorption spectroscopy (LAS).
At Knight Optical we can offer both complete gas cells as well as the individual components, including the transmission windows. Our gas cells can be provided unfilled, alternatively, if you require a reference gas cell, filled with a desired gas or gas mixture, we require information such as:
- Gas mixture and the desired concentration(s). Commonly used gases for reference cells include methane (CH4), ammonia (NH3), hydrogen cyanide (HCN), and acetylene (C2H2). We can provide other reference gases so please enquire for further information.
- Pathlength and whether this is fixed or variable.
- Substrate for the transmission windows, though we can work with you to determine which material would be suitable.
Speak to our experts about your Custom IR Gas Cell needs today
Call +44 (0)1622 859444 Call +1 401 583 7846Make a quick enquiry about Custom IR Gas Cells Now
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Typical Gas Cell Components
A gas cell generally comprises two principal optical components: the cylinder and the transmission windows. We offer these components in a variety of substrates to meet your custom gas cell requirements, making us your reliable infrared gas analyser component supplier. We can provide cylinders manufactured from substrates such as sodalime glass, whilst our transmission windows can be manufactured from more specialised materials such as magnesium fluoride MgF2 and calcium fluoride CaF2.
Below are some typical substrates used for these components.
The materials used in our gas cells are designed to transmit over a broad wavelength range. Specifically, the transmission windows are engineered to transmit into the infrared waveband. Knight Optical can supply these crucial components separately and can even introduce a slight wedge to the windows to minimise interference. This makes us a versatile provider for your custom gas cell and infrared gas analyser needs.
Cylinder substrate | Pyrex |
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Cylinder substrate | Borosilicate |
Cylinder substrate | Fused quartz |
Cylinder substrate | Soda lime float |
Cylinder substrate | Other materials: aluminium |
Transmission window substrate | Potassium bromide (KBr) |
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Transmission window substrate | Sodium chloride (NaCl) |
Transmission window substrate | Calcium fluoride (CaF2) |
Transmission window substrate | Zinc selenide (ZnSe) |
Frequently Asked Questions
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What is the Function of Gas Cells in Infrared (IR) Spectroscopy?
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Gas cells are used in infrared (IR) spectroscopy to contain the gas sample being analysed. Infrared radiation is transmitted through the gas sample to the detector. Depending on the material being analysed, different intensities of the transmitted wavelengths will reach the detector, as some is absorbed by the gas sample, and produce a unique spectrum.
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What are the Components of a Gas Cell?
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Knight Optical provides gas cells made up of two key components; the cylinder and the transmission window. The cylinder holds the gas that is used as for reference or to be analysed, typically there are gas inlet and outlet ports for the introduction and removal of the sample gas. The transmission window is manufactured from a material that transmits the desired wavelength range, often calcium fluoride (CaF2) or potassium bromide (KBr).
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Can I Get a Custom IR Gas Cell for My Specific Needs?
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Yes, by working closely with Knight Optical we can provide a custom IR gas cell that has been tailored to your specific requirements.
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How is an Infrared Gas Analyzer Different from an Infrared Gas Cell?
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An infrared gas analyzer is a set of equipment that is used to measure gases in a sample by passing infrared radiation through it. An infrared gas cell is a key component in instrumentation such as this and will contain either a reference gas or the sample itself.
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What are the Typical Applications of Infrared Gas Cells?
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Infrared gas cells are used in a variety of applications including systems such as emission, environmental, and safety monitoring. They are widely used in gas analysis and detection equipment for industries including medical, astronomy, research, defence, and laboratory.
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Additional Information
Pathlength
The pathlength describes the distance the incident beam traverses through the gas within the infrared gas cell. These are commonly categorised as short, long, or variable pathlengths, providing flexibility for your custom gas cell and infrared gas analyzer applications.
High-Concentration Cells
A short pathlength is ideal for high-concentration mixtures, such as a custom gas cell filled with 100% methane. This makes it a suitable choice for certain infrared gas analyzer applications.
Low-Concentration Cells
A long pathlength is required for low-concentration gases, often expressed in parts-per-billion (ppb), making it apt for measuring greenhouse gases in an air sample. This is particularly relevant for infrared gas analzser applications.
Fixed vs Variable Cells
Knight Optical offers both fixed and variable pathlength gas cells. The variable types utilise mirrors to extend the pathlength by reflecting the beam within the IR gas cell, rather than directing it straight through. This feature enhances the versatility of our custom gas cell offerings, making us a comprehensive solution.
Vapour & Liquid Cells
In addition to gas cells, Knight Optical also provides cell types suitable for holding vapours and liquids. For instance, our drilled cell windows can be integrated into demountable cell holders, which are generally used for holding liquid samples. This broadens our range of custom gas cell and infrared gas analyser solutions to meet your diverse analytical requirements.
Quality Assurance
Rigorous Window Testing
The flatness and irregularity of our transmission windows are rigorously tested using our Zygo Verifire XPZ interferometer. This advanced equipment also allows us to test the transmitted wavefront error of the window, ensuring the highest quality for your custom gas cell applications.
Precision in Parallelism
We assess the parallelism of our transmission windows using our Trioptics PrismMaster, which boasts an accuracy of up to 3 arc seconds. This meticulous testing ensures the utmost precision for your custom gas cell and infrared gas analyser components.
Advanced Spectral Scans
Transmission and reflection scans are diligently carried out on our Agilent Cary 7000 Spectrophotometer. This advanced instrument is capable of performing spectral scans at multiple angles of incidence and various polarisations, offering exceptional versatility for your needs.
Additional IR Testing
Further testing of infrared transmission is conducted on our Agilent Cary 660 FTIR spectrometer. This adds an additional layer of verification, ensuring the highest quality for your custom gas cell components.
Quality Control Standards
All optics undergo a 100% visual inspection prior to packaging. Our staff are trained to ISO 10110 and MIL-O-13830A standards and are capable of inspecting down to a 10/5 scratch/dig level. This rigorous quality control is particularly crucial for infrared gas analysers and custom gas cell components, especially in laser applications.
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With our in-house state-of-the-art metrology laboratory you can be confident that your optical components will meet your requirements. You can find out more about our testing facilities here.
Operating for over 30 years
Knight Optical has been operating for over 30 years, with our managing director Colin Overton at the helm. Over this time, we have become a global leader in the production and distribution of scientific optical components and bringing quality into focus for all of our products and services that we provide.
Our Catalogue
Inside Knight Optical’s catalogue you’ll find details of the industries we serve as well as the many other services we can offer. It also showcases hundreds of our most popular products, supported by useful technical information, to help you choose the right part for your application.
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