Method and apparatus for accurately measuring the distance to a

Details Method and apparatus for accurately measuring the distance to a Method and apparatus for accurately measuring the distance to a

1990-02-05

1991-07-02

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Specific application

Diffraction, reflection, or scattering analysis

378 86, 250308, 33702, G01B 1502

Patent

active

050291947

ABSTRACT:
Measuring the distance to a surface of an object using ultrasonic energy pulses, an ultrasonic energy pulse is directed toward the object and the time is measured for the reflection to return so as to determine the distance to the object. A reference ultrasonic pulse is directed through a fixed and known distance to provide a reference measurement. To enhance the accuracy of the measurement, the air in the region traversed by the ultrasonic pulses is mixed by directing a swirling flow of air in this region so that the temperature of the air in the path of the reference measurement is more nearly representative of the temperature of the air where the distance measurement is taken.

REFERENCES:
patent: 3341706 (1967-09-01), Swift et al.
patent: 3354310 (1967-11-01), Swift
patent: 3426206 (1969-02-01), Lehman et al.
patent: 4208581 (1980-06-01), Kaneko
patent: 4254478 (1981-03-01), Dumas
patent: 4541732 (1985-09-01), Shah
patent: 4581726 (1986-04-01), Makino et al.
patent: 4979197 (1990-12-01), Troxler, Sr. et al.

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