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Self-contained analog photodiode light sensing head

  • US 4,758,767 A
  • Filed: 05/15/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 05/15/1987
  • Status: Expired due to Term
First Claim
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1. A self-contained light sensor head operable to generate a low voltage and amperage output signal at a voltage no greater than thirty volts and an amperage no higher than eight amps, said signal being proportional to the amount of light sensed by said sensor head, and wherein the voltage and amperage of said output signal is compatible for direct transmission down a line from said sensor head to an analog computer that operates within a certain preselected range of voltages and amperages, said computer being remotely located from said sensor head, and said sensor head comprising:

  • a sensor housing;

    a photodiode received in said housing and in a position for sensing light, said photodiode being operable to produce an electrical response representative of the intensity of said sensed light;

    means operable for amplifying said photodiode electrical response, and for producing said output signal therefrom, for transmission from said sensor head to said analog computer, said amplifying means being received in said housing and positioned adjacent said photodiode;

    means operable for controlling gain of said output signal produced by said amplifying means, wherein said gain control means is received in said housing and positioned adjacent said amplifying means and said photodiode;

    means operable for supression of electrical noise in said output signal by using an electrical capacitance greater than 0.1 microfarads, wherein said noise supression means is received in said housing and positioned adjacent said photodiode, said amplifying means, and said gain control means; and

    means operable for supression of resonant oscillations in said output signal, said oscillation supression means being received in said housing and positioned adjacent said photodiode, said amplifying means, said gain control means, and said noise supression means.

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