Tunnel current detecting photo-acoustic spectrometer

Details Tunnel current detecting photo-acoustic spectrometer Tunnel current detecting photo-acoustic spectrometer

1988-09-19

1990-05-01

Rosenberger, Richard A.

Optics: measuring and testing

With plural diverse test or art

250306, 356432, G01N 2100, G01N 2300

Patent

active

049213466

ABSTRACT:
The amount of deformations such as expansions or contractions of a substance caused in accordance with irradiation of cyclically interrupted monochromatic light is detected by either the changes in a tunnel current sensitive to the changing distance between a sample surface and a detection probe or the amount of changes in a probe fine feed mechanism keeping the tunnel current constant between a sample surface and a detection probe at all times, so that the absorption spectrum intrinsic to the substance relative to the irradiating optical energy according to its wavelength is measured to examine the optical properties of the substance.

REFERENCES:
patent: 4343993 (1982-08-01), Binnig et al.
patent: 4522510 (1985-06-01), Rosencwaig et al.
patent: 4581939 (1986-04-01), Takahashi
patent: 4837435 (1989-06-01), Sakukara et al.
Bul. Electrotech. Lab., vol. 47, No. 2 (1983), "Photoacoustic Spectroscopy in Crystalline Semiconductors", Hotokumoto, pp. 97-108.
Reviews of Modern Physics, vol. 53, No. 3, July 1981, "Pulsed Optoacoustic Spectroscopy of Condensed Matter", C. K. N. Patel et al., pp. 517-550.

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