Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1974-10-15
1976-05-11
Queisser, Richard C.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 671, G01N 2900
Patent
active
039554040
ABSTRACT:
The invention refers to a measuring circuit for determining the properties of a workpiece, particularly hardness, using the contact impedance method in which a probe resonating at an ultrasonic frequency provided with a workpiece engaging tip is utilized. The measuring circuit uses digital counters for producing a digital count which is the difference between the free-resonant frequency of the test probe and the resonant frequency of the probe when the probe is in forced contact with the workpiece. A read-only-memory (ROM) converts the difference frequency count to a hardness value, such as Vickers or Rockwell. The disclosed arrangement obviates the need for zeroizing the circuit and, hence, is self-compensating in respect to drift and thermal stability.
REFERENCES:
patent: 3153338 (1964-10-01), Kleesattel
patent: 3302454 (1967-02-01), Kleesattel
patent: 3307393 (1967-03-01), Kessler
patent: 3323352 (1967-06-01), Branson
patent: 3472063 (1969-10-01), Branson
patent: 3595069 (1971-07-01), Fowler
Ultrasonics, "Ultrasonic Hardness Testing," Apr. 1966, pp. 88-91.
Bickel Wolf
Eichert Ulrich
Niklas Ludwig
Feig Philip J.
Krautkramer-Branson Incorporated
Kreitman Stephen A.
Queisser Richard C.
Steinberg Ervin B.
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