Auto-ranging ultrasonic attenuation meters

Details Auto-ranging ultrasonic attenuation meters Auto-ranging ultrasonic attenuation meters

1980-08-28

1982-05-04

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73602, G01N 2904

Patent

active

043275885

ABSTRACT:
An ultrasonic flaw detection system automatically measures attenuation of an input signal from a receiver transducer that provides a reference level. Successive amplifier stages having stepped gains provide graduated output levels that are detected and stored by individual peak readers. Sampled output levels are compared in comparators and with a reference voltage generated by a digital-to-analog converter to produce a binary output corresponding to each signal as a first coarse attenuation level. Logic control and timing circuitry selects the output level corresponding to one of the signals having a peak voltage in a predetermined range. A logarithmic converter and comparator provide a fine attenuation reading which is summed with the coarse reading in digital form. This is decoded and displayed as a total attenuation readout.

REFERENCES:
patent: 4105018 (1978-08-01), Greenleaf et al.
patent: 4202215 (1980-05-01), Meyer

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