A PORTABLE LOW-LEVEL LIGHTMETER. I: LOW-LEVEL LIGHTMETER FOR THE NEAR INFRARED
AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OH
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Results of former attempts to establish a value for visible radiation in the region between 7000 and 11,000 Angstroms in the near infrared of the night sky were unreliable due to lack of precision instruments. In this modification for the low-level lightmeter, an infrared image-conveter tube for converting the infrared into visible radiation is employed. Further, better stabilization in the transformer and change of voltage in the photomutiplier are made to achieve a higher sensitivity of the meter. Improvement in registering the brightness of the night sky in the near infrared 6300 to 11,000 Angstroms was noted.
- Electrooptical and Optoelectronic Devices