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news digest ♦ LEDs


operating temperatures range from -400 C to 1000 C with a maximum junction temperature of 1000 C.


Available and shipping now, the OD-850W IR LEDs are priced at $2.80 each for a minimum order of 100 pieces.


New instruments for LED characterisation


Instrument Systems is launching a new series of CCD array spectrometers and a current source. Both have been specially designed to assess LEDs


The CAS 120 series of measuring instruments has been specifically developed for price- sensitive applications in spectral light measurement, such as LED production or quality assurance. Although costs have been reduced, technical innovations deliver even higher levels of reliability.


The CAS 120 is an optical spectrometer which analyses the spectral characteristics of light radiation. Having additional optical probes and absolute calibration turns this type of measurement system into a spectroradiometer.


Cost-intensive cooling of the CCD detector with 2048 x 14 pixels was deliberately omitted for the CAS 120. Instead, the temperature of the CCD detector is recorded each time a spectrum is measured, and an innovative algorithm automatically corrects the signal.


The newly developed filter wheel with density filters OD 1 to OD 4 comes without any mechanical position switches and always guarantees exact filter positions. It expands the total dynamic range of the CAS 120 to 8 decades, enabling the measurement of low and high light intensities without manual intervention in the test procedure.


The CAS 120 is equipped with a USB interface and a TTL trigger I/O. The hardware trigger permits synchronisation with other instruments which is essential for exact measurement results during fast production testing.


CAS 120 CCD array spectroradiometer


A Crossed Czerny Turner Spectrograph with back-illuminated CCD detector forms the core of the spectrometer. This means that the CAS 120 guarantees exceptionally low stray light and a very high level of optical precision.


66 www.compoundsemiconductor.net January / February 2012


Examples of data from a CAS 120 spectroradiometer shown on SpecWin Pro analysis software


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