Multi-Channel Fiber Spectrometer
Tuesday, 14 June 2011
At the heart of Mightex (Pleasonton, CA) multi-channel 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. The spectrum of each channel is dispersed by a
high-efficiency diffraction grating and then imaged onto a 2D CCD sensor.
Light from each channel occupies different rows on the CCD sensor. All
channels are exposed simultaneously, then rows associated with each channel
are binned together to produce a spectrum for the channel. Fiber channels are
spaced out properly to essentially eliminate crosstalk between adjacent
channels. The standard CCD camera features a 1/2" 1.3MP Sony ICX205 imager with
a 12-bit ADC. Exposure time (integrating time) can be varied between 50us and
here to learn more.