Gas analysis is used in many fields including environmental monitoring, process control, energy, and healthcare. Compared to other methods, gas analysis based on the absorption of gases at specific near- and mid-infrared wavelengths has advantages such as non-contact measurement, higher sensitivity, and long product lifetimes. Absorption-based gas analyzers require an infrared detector, of which we offer many choices including RoHS-compliant InAsSb photovoltaic detectors.
Hamamatsu offers many infrared detector choices for absorption-based gas analyzers, including RoHS-compliant InAsSb photovoltaic detectors. When selecting an appropriate detector, it is important to match the gases’ absorption bands to the detector’s spectral sensitivity. Other detector characteristics to consider include:
There are detectors optimized for room temperature operation, but in highly analytical applications, cooling may be required. There are two methods to cool infrared detectors: 1) using a built-in thermoelectric (TE) cooler, and 2) adding liquid nitrogen. While TE-cooling is more convenient and requires less frequent replacement, liquid nitrogen’s deeper cooling gives a detector higher D* values, indicating better performance.
We offer a diverse lineup of IR detectors. Their cutoff wavelength and D* values are shown in the table below.
|D* values at peak wavelength (cm·Hz1/2/W)|
|Cutoff wavelength||Detector||Uncooled||Thermoelectric cooling||Liquid nitrogen cooling|
|14 µm||Type II Superlattice||--||--||Up to 1.6 x 1010|
|11 µm||InAsSb photovoltaic (RoHS compliant)||Up to 1 x 109||Up to 6 x 109||--|
|6.7 µm||InSb photoconductive||--||Up to 1 x 1010||--|
|5.5 µm||InSb photovoltaic||--||--||Up to 1.6 x 1011|
|20 µm||Thermopiles||Up to 1.3 x 108||--||--|
|3.6 µm||InAs photovoltaic||Up to 4.5 x 109||Up to 3.2 x 1010||Up to 6 x 1011|
|2.6 µm||InGaAs PIN photodiodes||Up to 1 x 1012||Up to 8.5 x 1012||--|
Unfortunately, many detectors in the MIR space rely on hazardous materials outlined by RoHS standards. These materials are also prone to high variance at high volumes. Hamamatsu's product line is fully RoHS compliant, relying on indium arsenide antimonide (InAsSb) material. Mercury, cadmium, or lead are not used. Our InAsSb detectors’ cutoff wavelengths span from 5.3 µm up to 11 µm. Customizations for these detectors include built-in filters and window material.
With so much information in the longer wavelengths, the boundaries needed to be pushed. Hence the development of Type II Superlattice, a new innovation for InAsSb material. Our proprietary layering design presents new characteristics that yield high sensitivity out to 14 microns. Currently available with liquid nitrogen cooling with TEC versions under development.
Our indium antimonide (InSb) photoconductive detectors are sensitive to IR wavelengths up to 6.7 µm, and all are TE-cooled.
Sensitive up to 5.5 µm, indium antimonide (InSb) photovoltaic detectors can be used to detect gases below the 5 µm wavelength band. All of our InSb detectors are cooled with liquid nitrogen.
Our thermopiles have a spectral range of 3-20 micron, and we also offer a two-stage thermopile with filters catered to CO2 measurements. Although they are less expensive than photovoltaic or photoconductive detectors, they have lower D* values and much slower response speed.
Sensitive up to 3.6 µm, indium arsenide (InAs) photovoltaic detectors feature low noise, high sensitivity, high-speed response, and high reliability. They are available in uncooled, TE-cooled, or liquid-nitrogen-cooled models.
Indium gallium arsenide (InGaAs) PIN photodiodes are suitable for gas sensors operating in the near-infrared region. They feature high D* values, low noise, high-speed response, and high reliability.
High-sensitivity and high-speed infrared detector with 14 um cutoff wavelength.
InAsSb photovoltaic detectors deliver high sensitivity in the 5 μm, 8 μm, and 11 μm band due to our unique crystal growth technology.
It looks like you’re in the . If this is not your location, please select the correct region and country below.
You're headed to Hamamatsu Photonics website for U.K. (English). If you want to view an other country's site, the optimized information will be provided by selecting options below.
For modern websites to work according to visitor’s expectations, they need to collect certain basic information about visitors. To do this, a site will create small text files which are placed on visitor’s devices (computer or mobile) - these files are known as cookies when you access a website. Cookies are used in order to make websites function and work efficiently. Cookies are uniquely assigned to each visitor and can only be read by a web server in the domain that issued the cookie to the visitor. Cookies cannot be used to run programs or deliver viruses to a visitor’s device.
Cookies do various jobs which make the visitor’s experience of the internet much smoother and more interactive. For instance, cookies are used to remember the visitor’s preferences on sites they visit often, to remember language preference and to help navigate between pages more efficiently. Much, though not all, of the data collected is anonymous, though some of it is designed to detect browsing patterns and approximate geographical location to improve the visitor experience.
Certain type of cookies may require the data subject’s consent before storing them on the computer.
This website uses two types of cookies:
There are two ways to manage cookie preferences.
If you wish to restrict or block web browser cookies which are set on your device then you can do this through your browser settings; the Help function within your browser should tell you how. Alternatively, you may wish to visit www.aboutcookies.org, which contains comprehensive information on how to do this on a wide variety of desktop browsers.
Occasionally, we may use internet tags (also known as action tags, single-pixel GIFs, clear GIFs, invisible GIFs and 1-by-1 GIFs) at this site and may deploy these tags/cookies through a third-party advertising partner or a web analytical service partner which may be located and store the respective information (including your IP-address) in a foreign country. These tags/cookies are placed on both online advertisements that bring users to this site and on different pages of this site. We use this technology to measure the visitors' responses to our sites and the effectiveness of our advertising campaigns (including how many times a page is opened and which information is consulted) as well as to evaluate your use of this website. The third-party partner or the web analytical service partner may be able to collect data about visitors to our and other sites because of these internet tags/cookies, may compose reports regarding the website’s activity for us and may provide further services which are related to the use of the website and the internet. They may provide such information to other parties if there is a legal requirement that they do so, or if they hire the other parties to process information on their behalf.
If you would like more information about web tags and cookies associated with on-line advertising or to opt-out of third-party collection of this information, please visit the Network Advertising Initiative website http://www.networkadvertising.org.
We use third-party cookies (such as Google Analytics) to track visitors on our website, to get reports about how visitors use the website and to inform, optimize and serve ads based on someone's past visits to our website.
You may opt-out of Google Analytics cookies by the websites provided by Google:
We inform you that in such case you will not be able to wholly use all functions of our website.