Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1993-02-01
1994-09-06
Snow, Walter E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7662, 377 42, G01R 2302
Patent
active
053451686
ABSTRACT:
A frequency monitoring system constructed of a rack mountable instrument for monitoring laser pulse frequency. The pulsed laser frequency is displayed on a linear bar-graph array composed of Light Emitting Diodes (LED's). The display is calibrated so that each LED represents a radio frequency (RF). When the transmitter laser pulses, the laser pulse is reflected by the target object and detected by the receiver and amplified. A small amount of the laser pulse transmitted is detected and mixed with a stable local oscillator signal to produce an RF burst that is sent to the frequency monitor and converted to TTL levels with a high-speed TTL voltage comparator. The TTL signal is fed into the clock input of a binary counter which is cleared and gated by a synch pulse from the transmitter. The output of the binary counter is sent to a digital to analog converter which converts it into an output voltage that is in turn amplified and used as reference points for LED dot/bar driver IC's. The LED drivers provide input for the linear array of LED's selected to operate in a bar length mode or a moving dot mode.
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Jones Thomas H.
Kusmiss John H.
Miller Guy M.
Snow Walter E.
Solis Jose M.
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