Automatic measurement and display of resonance frequencies...

Details Automatic measurement and display of resonance frequencies... Automatic measurement and display of resonance frequencies...

G - Physics

01

R

324/36

G01R 23/00 (2006.01) G01H 13/00 (2006.01) G01V 13/00 (2006.01)

Patent

CA 1054679

ABSTRACT OF THE DISCLOSURE AUTOMATIC MEASUREMENT AND DISPLAY OF RESONANCE FREQUENCIES OF SEISMIC DETECTION ELEMENTS An apparatus and a method are described with which the resonance frequencies of seismic detector elements, such as geophones, hydrophones, or sets of geophones or hydro- phones, may be automatically determined and displayed with relatively high precision, e.g., to two decimal places. The high precision provided by the present invention is part- ly due to the use of a sine wave voltage synthesizer, synthe- sizing a required voltage from a large number of discrete constant voltages, changing from one voltage value to the next in response to activation pulses of a relatively high repetition rate. The activation pulses whose repetition rate must be exactly in proportion to the frequency of the sine wave, are counted rather than the cycle of the sine wave itself.

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