CAS 140CT - The Standard for Array Spectrometers

The CAS 140CT, already in its 3rd generation, is the most successful array spectrometer from Instrument Systems worldwide. These instruments combine high accuracy with an opto-mechanically robust design and a simple operation. The range of applications is thus correspondingly wide - from 24 hour, round-the-clock operation in manufacturing to use as a reference instrument in calibration laboratories.

Centerpiece of the CAS 140CT is the newly developed Crossed-Czerny-Turner spectrograph incorporating a high-end, back-Illuminated CCD detector. The spectrometer design thus effectively reduces stray light, resulting in significantly improved dynamic range and measurement accuracy.

The CAS 140CT is the only array spectrometer to include an optical density filter wheel, extending the measurable intensity range over 4 orders of magnitude. Measurements for both very weak and very strong light sources can thus be acquired fully automatically.

Features:

various models from 200 to 2150 nm
high-end, cooled, back-Illuminated CCD detector for highest sensitivity and signal stability
wide intensity measurement range via integrated optical density filter wheel
integrated shutter for dark current measurements
acquisition times in the millisecond range
optionally USB or PCI interface
software solutions for laboratory and manufacturing applications

Applications:

system solutions for testing LEDs, displays und flash lamps
spectroradiometry in the UV-VIS-NIR range
universal spectrometer for laboratory applications
industrial quality control in the production line

Models:

Model	Spectral range [nm]	Number of pixels	Spectral resolution [nm] *	Datapoint interval [nm]
back-illuminated CCD detector
CAS140CT-151	360 - 830	1024 x 128	2.2	0.5
CAS140CT-152	200 - 800	1024 x 128	2.7	0.6
CAS140CT-153	380 - 1040	1024 x 128	3.0	0.6
CAS140CT-154	220 - 1020	1024 x 128	3.7	0.8
CAS140CT-155	750 - 1050	1024 x 128	2.0	0.3
CAS140CT-156	300 - 1100	1024 x 128	3.7	0.8
InGaAs or extended InGaAs detector
CAS140CT-171	780 - 1650	512	9	2.
CAS140CT-175	1500 - 2150	256	15	3

* for standard 100µm slit, for 50µm slit the given values should be roughly halved

CAS140CT Brochure

Optical design of the CAS 140CT

The Crossed-Czerny-Turner spectrograph is housed in a mechanically robust block. The incident light is first collimated by a concave mirror and guided on to the diffraction grating, where it is spatially split into its different spectral components. A second concave mirror focuses the various spectral components of the light onto different columns of the CCD detector, thus capturing the light's spectrum in a single acquisition.