Measuring and testing – Vibration – By mechanical waves
Patent
1988-03-02
1989-05-16
Chapman, John
Measuring and testing
Vibration
By mechanical waves
73901, G01N 2904
Patent
active
048298247
ABSTRACT:
Method for the digital peak value measurement for ultrasonic test pulses having a predetermined pulse repetition frequency. After amplification, the input signal to be measured is present at a comparator circuit the output of which is connected, within a predetermined time slot, periodically generated, for the expected signal time range, to a memory which is reset at the beginning of the time slot. The received signal is applied to a window comparator the window width of which corresponds to one voltage step of a reference voltage which is supplied by a D/A converter and which can be changed in steps. The D/A converter is controlled by a digital counter the direction of counting of which is controlled in dependence on the memory contents and which is stopped in the case of equality between the received signal within the time slot and the respective reference voltage. The display is derived from the final count. The clock signal for the digital counter has the same frequency as the time slot and is derived from it. To extend the dynamic range, the amplified signal can be applied to the window comparator with different signal levels.
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D. Bowers, "Tracking A/D Conversion", Electronic Engineering, Dec. 1979, 37-42.
Hillger Wolfgang
Klebusch Jurgen D. E.
Chapman John
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
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