PRODUCTS CRYORAD II CRYOGENIC RADIOMETERS
Specifications*
Spectral Range 0.25 – 50 µm
Receiver Thermal Response Time (1/e) (1/e) < 8 seconds
Servo Settling Time (to 0.01% of signal) 40 seconds
Receiver Responsivity 2 ±0.25 K/mW
Dynamic Range to 1 mW
Noise (rms) < 2 nW (varies with operating power)
Absolute Accuracy <0.005%
Cryostat Dimensions 27 cm (D) X 55 cm (H)
Cavity absorptance > 0.9999 (at 632.8 nm)
LHe hold time > 72 hrs
*nominal values — modifications upon request to meet other requirements
Equipment
Cryostat with:
TC-04 electronic controller system including:
PC Compatible PC with LED monitor including:
Additional Accessories:
CryoRad versions available optimized for laser, monochromator, synchrotron or low-background IR applications.
The CryoRad II is the first universal cryogenic electrical substitution radiometer, designed for convenient detector calibrations with both laser, lamp or monochromator illumination. It’s novel cavity design enables use with beams as fast as f/8 without changing or moving the receiver. Its fast cavity response removes background drifts and provides noise thresholds below 2 nW, even with an f/8 entrance aperture and viewing an ambient-temperature window. The highest accuracy (0.005%) is achieved in laser beam measurements with a Brewster-angled window. In monochromator measurements, the sensitivity and accuracy are a factor 5 – 10 better than achieved with room temperature ESR’s. The CryoRad II is now in use at metro-logy laboratories throughout the world, for a wide range of photo-detector calibrations. CryoRad versions available for laser, monochromatic, synchrotron, or low background IR applications.
Features
Download:
Drawing:
CryoRad II Product Information Sheet (pdf)
See Accessory:
© 2017 L-1 Standards and Technology, Inc.
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