Self-calibrating photoacoustic apparatus for measuring light int

Details Self-calibrating photoacoustic apparatus for measuring light int Self-calibrating photoacoustic apparatus for measuring light int

1977-11-04

1980-01-22

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250252, 250351, 356216, 356217, G01J 342, G01J 156

Patent

active

041847687

ABSTRACT:
Pulsed light and readily measurable pulsed electrical energy are independently applied to a solid black, conductive sample in a gas-filled photoacoustic cell, each causing the black sample to heat. The heating of the black sample causes a pressure wave in the cell, which can be detected and measured. By adjusting the pulsed electrical energy, the pressure wave resulting from the pulsed electrical energy can be made to relate to the pressure wave resulting from the pulsed light in a predetermined manner. The pulsed light input intensity can then be measured in electrical units based on the measurable input of the electrical energy pulses. In this manner, the invention can be used as a radiometer. A second application for the present apparatus is in calibrating photoacoustic spectroscopy (PAS) cells. The PAS cell can be self-calibrated by discontinuing the light pulses and relating the pressure wave output to the electrical energy pulse input. The measurement then of light absorption in a test sample, which need be neither black nor conductive, can be made in absolute energy units based on the self-calibration relationship.

REFERENCES:
patent: 4051371 (1977-09-01), Dewey, Jr. et al.

Affiliated with

Also associated with

Rating

Self-calibrating photoacoustic apparatus for measuring light int does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Self-calibrating photoacoustic apparatus for measuring light int, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-calibrating photoacoustic apparatus for measuring light int will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-331993