Ultrasonic transducer with reference reflector

Details Ultrasonic transducer with reference reflector Ultrasonic transducer with reference reflector

1977-08-30

1978-12-19

Kreitman, Stephen A.

Measuring and testing

Liquid level or depth gauge

73644, 310327, 310335, 310336, G01F 2328

Patent

active

041300181

ABSTRACT:
An ultrasonic transducer for a system for determining liquid levels by echo ranging composed of a housing including a piezoelectric crystal mounted within the housing to transmit acoustic waves, an impedance matching medium mounted within the housing adjacent the crystal and including a window layer and a diaphragm layer to transmit acoustic waves between the crystal and a gaseous environment which window layer is composed of a material having hollow glass spheres dispersed therein, and a dampening backing mounted in said housing to abut the crystal which backing includes a plurality of solid lead spheres; a tube mounted to extend from the housing to form a beam of acoustic waves propagated from said crystal, the tube having an end which is telescoped into the housing and spaced a short distance from the diaphragm to form a gap for flow communication; and a reference reflector assembly mounted to extend from adjacent said housing, which assembly includes a U-shaped member having two legs extending in slideable contact with the sidewall of the tube and further including a member connecting the two legs.

REFERENCES:
patent: 2430013 (1947-11-01), Hansell
patent: 3357246 (1967-12-01), Stearn et al.
patent: 3376438 (1968-04-01), Colbert
patent: 3394586 (1968-07-01), Cross
patent: 3663842 (1972-05-01), Miller
patent: 3794866 (1974-02-01), McElroy et al.
patent: 3834233 (1974-09-01), Willis et al.
patent: 3890423 (1975-06-01), Zacharias
Emerson and Cuming, Inc., Technical Bulletin 14-2-1, "Eccospheres.RTM. IG-101", Rev. 9/75.
Inventron Industries Inc., "Level Control", p. 14.
Electronics, "Plastic Disk Makes Transducer Excel in Calculating Distances by Ultrasound", pp. 76, 78, May 25, 1978.

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