Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1977-02-04
1978-04-25
Dixon, Harold A.
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
250336, G01J 142
Patent
active
040864898
ABSTRACT:
An ultraviolet radiation personnel hazard monitor having a quartz diffuser which receives ultraviolet radiation. The diffused radiation is then passed through an input slit of a dispersive device such as a prism or a diffraction grating. The spatically dispersed radiation is then passed through another mask having a slit which passes a wavelength band between 230 and 320 nanometers. The radiation is then passed through a plurality of interference filters placed side by side and each having bandpass characteristics corresponding to the wavelength bands applied to them. The radiation is then passed through an adjustable parallel slit collimator which corrects the irregular response obtained from the filters and other wavelength response irregularities of the device, to the desired response curve corresponding to the photobiological response curve of the American Conference of Governmental Industrial Hygienists. The radiation passing through parallel slit device is passed through a converging lens to a photodetector with the output of the photodetector being supplied to a display meter through an operational amplifier.
REFERENCES:
patent: 3851970 (1974-12-01), Adler et al.
"Portable Meters for the Measurement of Light and Ultraviolet Energy" by Luckiesh et al., General Electric Review, Apr. 1941, pp., 217-221.
Dixon Harold A.
Killoren Richard J.
Rusz Joseph E.
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