Multichannel Spectrometers

Mightex Systems

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Multichannel spectrometers are used to monitor or measure multiple samples or sources simultaneously. Mightex Systems has leveraged state-of-the-art optics and CCD cameras to bring to the market compact multichannel fiber spectrometers that feature high spectral resolution and high light throughput.

At the heart of the spectrometers is a high-throughput, flat-field imaging spectrograph. Multiple input fibers, each representing an independent signal channel, are aligned along the input slit of the imaging spectrograph. Spectra of each channel are dispersed by a diffraction grating and then imaged onto a 2-D CCD sensor, with light from each channel occupying different rows on the sensor. All channels are exposed simultaneously, then rows associated with each are binned together to produce a spectrum for the channel. Fiber channels are spaced out properly to eliminate crosstalk between adjacent channels.

The standard CCD camera features a ½-in., 1.3-megapixel Sony ICX205 imager with a 12-bit analog-to-digital converter. Exposure time can be varied between 50 µs and 200 s. The electronics hardware also includes trigger input and four programmable digital input/outputs for interfacing with other equipment, such as a light source. The spectrometer is controlled through a USB 2.0 interface, which also supplies all the electric power needed to operate the spectrometer. The company also integrates other cameras to build custom multichannel spectrometers.

Input ends of the fibers are connected via SMA 905 connectors. Sleeves are available to connect the fibers to other SMA connectors. The standard software package includes full-featured multichannel spectrometer PC software and a software development kit. The software also supports radiometric calibration and photometric calculations.

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Published: April 2011