Method and apparatus for measuring entrained air in concrete

Details Method and apparatus for measuring entrained air in concrete Method and apparatus for measuring entrained air in concrete

1989-12-28

1992-01-21

McGraw, Vincent P.

Optics: measuring and testing

Of light reflection

With diffusion

356133, 250574, G01N 2149

Patent

active

050823710

ABSTRACT:
A device for measuring entrained air in concrete, includes a needle tube for insertion into the concrete, the needle tube having a distal end; an optical fiber extending through the needle tube to the distal end, with the end of the optical fiber and the distal end of the needle tube being ground to have a sharp conical angle; a laser diode which produces laser light; a coupling device which supplied the laser light from the laser diode to the optical fiber and which separates the light reflected back through the optical fiber; and a photodetector which converts the received light from the coupling device to an electrical signal corresponding to the intensity of the reflected light.

REFERENCES:
patent: 4622974 (1986-10-01), Coleman et al.
patent: 4623789 (1986-10-01), Ikeda et al.
patent: 4659218 (1987-04-01), de Lasa et al.

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