Photo-thermal sensor including an expansion lens in a light beam

Optics: measuring and testing – For light transmission or absorption

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G01N 2100

Patent

active

055130062

ABSTRACT:
In a photo-thermal sensor for determining the concentration of a compound in a sample which includes an excitation light source generating a first light beam of a wave length which is well absorbed by the compound to be determined, a modulator and an optical lens system disposed in the first light beam such that the first light beam is constricted at the location of the sample through which it is directed, a probe light source generating a second light beam extending at a right angle to the first light beam, a beam divider arranged at the intersection of the first and second light beams whereby part of the first light beam is deflected at one side of the beam divider and the second light beam passes through the beam divider such that both beams incide on the sample anti a photo-sensitive detector arranged in the light beam path behind the sample, a diaphragm is arranged in the beam path directly after the sample and an expansion lens adapted to expand the second light beam at the location of the sample to a diameter at least 5 times the diameter of the first light beam is disposed in the path of the second beam ahead of the beam divider for determining the loss of strength of the second light beam reaching the detector after passage through the sample and the diaphragm as an indication of the concentration of the compound in the sample.

REFERENCES:
patent: 4750822 (1988-06-01), Rosencwaig et al.
patent: 4795260 (1989-01-01), Schuur et al.
patent: 4938593 (1990-07-01), Morris et al.
patent: 5365065 (1994-11-01), Power
Xu et al, "Thermal Lens-Circular Dichroism Spectropolarimeter", Applied Spectroscopy, vol. 44, No. 6, 1990, pp. 962-966.
Dual Beam Optic Fiber Lens Spectroscopy, D. Rojas, R. Silva, D. Spear R. Russo; Anal. Chem. 1991, 63, 1927-1932.
Comparison of BaTiO.sub.3 Optical Novelty Filter and Photothermal Lensing Config. in Photothermal Experiments Anal. Chemistry 64 (1992) Sep. 1, No. 17, Washington D.C.
Pulsed Mode Thermal Lens effect Detection in the near field via thermally induced probe beam spatial phase modulation: a theory Applied Optics/vol. 29, No. 1/1. Jan. 1990 pp. 52-62, J. F. Power.
Mode Mismatched Laser Induced Thermal Lens effect detection via spatial Fourier Analysis of Beam--J. F. Powes and E. D. Salin Anal. Chem. 1988, 60, 838-842.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Photo-thermal sensor including an expansion lens in a light beam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photo-thermal sensor including an expansion lens in a light beam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photo-thermal sensor including an expansion lens in a light beam will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-632953

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.