Grating ozone spectrophotometer

Details Grating ozone spectrophotometer Grating ozone spectrophotometer

1984-12-04

1987-03-24

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

250373, 356328, 356332, G01J 318, G01J 332

Patent

active

046527613

ABSTRACT:
A holographic grating spectrophotometer for detecting ozone and sulphur dioxide in the atmosphere is described which provides automatic calibration and which provides automatic linearity correction for the photomultiplier tube. Automatic calibration is provided by using a computer to control a stepper motor to move the grating so that the photomultiplier tube receives maximum intensity at the calibration wavelength of 302.1 nm from a mercury source. Automatic linearity correction is obtained by cycling a wavelength selection mask across exit slits located in the focal plane of the device and firstly combines separately taken counts of two different wavelengths and comparing this sum with the sum of counts of these wavelengths taken simultaneously. The difference is used to calculate photomultiplier tube deadtime and improve accuracy of the results. In a preferred embodiment five wavelengths are used to calculate ozone and sulphur dioxide levels, and a stepper motor driving a cylindrical wavelength selection mask permits exit slits to be exposed to predetermined wavelengths one at a time.

REFERENCES:
patent: 3229566 (1966-01-01), Hutchinson et al.
patent: 4448529 (1984-05-01), Krause

Affiliated with

Also associated with

Rating

Grating ozone spectrophotometer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Grating ozone spectrophotometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Grating ozone spectrophotometer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1355616