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  • Concave-Grating Spectrometer
Jul 2007
StellarNet Inc.Request Info
TAMPA, Fla., July 27, 2007 -- StellarNet Inc. has developed what it said is a "super range" concave-grating spectrometer for the UV-VIS-NIR (ultraviolet/visible/near-infrared) range from 200-1100 nm.

An aberration-corrected concave grating provides superb imaging and top spectral efficiency with unique dual blaze technology for UV and NIR wavelengths, the company said.

The spectrograph contains no mirrors to minimize stray light while the flat field grating delivers a uniform focus on the detector for ~1-nm resolution, according to the company. The instrument connects directly to a PC’s USB port and includes SpectraWiz software.

StellarNet.jpgA 2048-element CCD detector is standard with 3600-element PDA optional. The optical input is via fiber-optic cable with SMA-905 termination. The instrument is designed to be vibration tolerant with no moving parts or detector sockets, suitable for portable or industrial process stream applications including remote sensing or standard test and analysis, according to StellarNet. Up to eight units may be daisy-chained via USB-2.0 hubs, allowing simple configurations for dual and multibeam process applications.

StellarNet said the spectrometer retails for $3500 with the customer's choice of 14-, 25-, 50-, 100-, or 200-µm slit, and is available in two ranges: the C-SR (200-1080 nm) and the CXR-SR (220-1100 nm). It makes an ideal OEM component for application-specific analytical instrumentation used in process control or quality control monitoring, the company said.

The included SpectraWiz operating software acquires and displays the spectral data in real time for absorbance, transmittance (or reflectance), and emission (or irradiance), StellarNet said. LabView programs are also included; additional software is available for process control, neural networks, PLS, and color quality control.

For more information, visit:; e-mail:

StellarNet Inc.
14390 Carlson Cir.
Tampa, FL 33626
Phone: (813) 855-8687
Fax: (813) 855-2279


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concave grating
A reflecting grating ruled on a concave spherical surface that not only disperses the light but focuses the spectrum. The great advantage of this grating lies in the fact that no separate collimating optics are needed.
The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
process control
The collection and analysis of data relevant to monitoring the rate and quality of industrial production, either continuously or in batches. Corrections can be made manually or automatically, via a feedback control loop.
Pertaining to or as a function of wavelength. Spectral quantities are evaluated at a single wavelength.
An optical instrument for forming the spectrum of a light source and recording it on a film. The dispersing medium may be a prism or a diffraction grating. A concave grating requires no other means to form a sharp image of the slit on the film, but a plane grating or a prism requires auxiliary lenses or concave mirrors to act as image-forming means in addition to the dispersing element. Refracting prisms can be used only in parallel light, so a collimating lens is required before the prism and...
A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.  
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