Infrared (IR) spectroscopy is an umbrella term for spectroscopic techniques that involve probing of matter with infrared radiation. Typically, the aim of this investigation is the identification of a specific compound and its concentration. In the simplest absorption IR spectroscopy, a broadband IR source illuminates a sample. A molecule absorbs radiation of specific wavelengths depending on the allowed transitions between its quantum mechanical vibrational and rotational states. The configuration of states is unique to a molecule. The spectrum of the transmitted light contains absorption features whose distribution and intensity depend on the chemical composition of the sample. A typical setup for dispersive absorption IR spectroscopy consists, apart from mirrors and lenses, of an IR source, reflection or transmission grating, and image sensor. The technique can be used to analyze solid, liquid, and gaseous samples. Gas emission monitoring and quality control for the presence of impurities are two application examples of IR absorption spectroscopy.
Hamamatsu is a leading manufacturer of essential components for IR spectroscopy. These include InGaAs image sensors covering the 0.9-2.55 μm range and single-element detectors (photovoltaic, photoconductive, and pyroelectric types) covering the wavelength range from visible up to ~20 μm. Hamamatsu also manufactures complete compact spectrometers and FTIR engines with a Michelson-Morley interferometer, an InGaAs PIN photodiode, and a calibration laser inside.
Fourier-transform infrared (FTIR) spectroscopy is a popular alternative to the dispersive technique described above. Here, the incident radiation from a broadband IR source, after passing through the sample, is directed to the Michelson-Morley interferometer, and then to a single-element IR detector. The detector produces an interferogram: light level measured by the detector as a function of the mirror position in the interferometer. Applying fast Fourier transform to the interferogram produces the spectrum of the sample and the source. Subtracting the spectrum of the source yields the spectrum of the sample. Compared to dispersive techniques, FTIR offers three advantages that improve signal-to-noise ratio: multiplexing, higher throughput, and higher wavelength accuracy. FTIR can be employed – as an alternative – in all applications where a dispersive technique is used. Because FTIR offers a higher sensitivity and a shorter data acquisition time, additional applications become feasible, for example, hyperimaging, studies of proteins in biological samples, or in-situ 13C/12C ratio analysis in water carbonates.
FTIR remains an extremely popular technique for analytical chemistry. Hamamatsu's infrared detectors have the wide coverage, sensitivity, and price point necessary to give instruments a competitive edge.
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 is proud to showcase a fully RoHS-compliant product line relying on indium arsenide antimonide (InAsSb) material. No mercury, cadmium, or lead are used.
InAsSb detectors are RoHS compliant, unlike mercury cadmium telluride (MCT) detectors. They also have highly stable characteristics and minimal variations from one detector to another. The cutoff wavelength of our InAsSb detectors ranges from 3 µm up to 14 µm.
When selecting an InAsSb detector, consider these characteristics:
QCLs have an extremely narrow emission band in the mid-infrared region, making them suitable for high-accuracy measurements. When selecting QCLs, consider these characteristics:
We offer continuous wave (CW HHL package) and pulsed QCLs with emission wavelengths within the 4 – 10 µm band. They feature high output, high-speed response, and high reliability.
FTIR engine with a Michelson optical interferometer and control circuit are built into a palm-sized enclosure.
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.
Quantum cascade lasers are semiconductor lasers that offer peak emission in the mid-IR range (4 μm to 10 μm). They have gained considerable attention as a new light source for mid-IR applications such as molecular gas analysis used in environmental measurement.
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.