Device for non-contact gauging of thickness or weight per unit a

Details Device for non-contact gauging of thickness or weight per unit a Device for non-contact gauging of thickness or weight per unit a

1978-01-03

1980-03-18

Willis, Davis L.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

250397, G01N 2300

Patent

active

041941144

ABSTRACT:
The device for non-contact gauging of the thickness of various materials, such as paper, textiles, films and others utilizes the principle of non-contact measurement of said parameter by means of a radioactive source and comprises a radiation source of charged radiation and a radiation detector located on one side of the material to be gauged. The invention is characterized by the fact that the radiation source and the radiation detector are interposed between the poles of a magnetic means. According to one of the embodiments of the invention, the magnetic means comprises two pole sections of which one accommodates the radiation source and the other, the radiation detector, and the section accommodating the radiation source has pole shoes adapted to vary the distance therebetween.
This device features a higher accuracy of measurements, makes it possible to use a low-active radiation source, simplifies radiation protection and reduces the mass and size of the device sensing unit.

REFERENCES:
patent: 3631238 (1971-12-01), McDonald
patent: 3928765 (1975-12-01), Teller
patent: 3942017 (1976-03-01), Uehara et al.
patent: 4115690 (1978-09-01), Weinstock et al.

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