Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1977-06-22
1982-03-23
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
250458, 250459, 356323, 356417, G01N 2164
Patent
active
043209700
ABSTRACT:
An ultraviolet light beam is split into two beams which are directed toward a reference cell and a sample cell, respectively. A mechanical rotating light chopper permits the reference and sample cells to be alternately illuminated. Radiation from the reference and sample cells is directed toward and sensed by a single photomultiplier tube. An up/down counter counts the number of photons impinging on the photomultiplier tube from the reference and sample cells. Photodiodes in conjunction with the mechanical light chopper cause the up/down counter to count up when photons are arriving from the sample cell and cause the up/down counter to count down when photons are arriving from the reference cell. A source intensity monitor prohibits further measurements after a preselected amount of incident flux has been sensed. The intensity monitor includes a photodetector circuit which senses a portion of the incident light. Pulses from the detector are fed to a counter and the number in the counter is compared to a preselected number which is set on a thumbwheel switch. When the comparison condition is met, the up/down counter of the fluorimeter is stopped.
REFERENCES:
patent: 3738755 (1973-06-01), Chaney et al.
patent: 3832555 (1974-08-01), Ohnishi
patent: 3854050 (1974-12-01), Peterson et al.
patent: 3886363 (1975-05-01), Ohnishi et al.
patent: 3897155 (1975-07-01), Smythe
patent: 3903422 (1975-09-01), Buhrer
Bunting James R.
Dowben Robert M.
LandOfFree
Photon counting fluorimeter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photon counting fluorimeter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photon counting fluorimeter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1648674