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Optical-electronic rangefinder

  • US 4,721,384 A
  • Filed: 01/27/1986
  • Issued: 01/26/1988
  • Est. Priority Date: 01/26/1985
  • Status: Expired due to Term
First Claim
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1. A circuit arrangement for processing voltages on the output of a light transmitter of an optical-electronic rangefinder, said rangefinder including a light transmitter in the form of a CW laser diode transmitting a well focussed high intensity light beam, a light receiver having a position sensitive detector, the central axis of the light transmitter and the optical axis of the light receiver defining a predetermined acute angle therebetween, a pulse-electronic circuit for controlling the light transmitter and an amplifier circuit for transforming the currents received from the position detector into proportional voltages, said circuit arrangement comprising two high pass filters in two separate channels for converting the output currents of the position detector in the light receiver into measuring light voltages, said channels each having means for offset and drift compensation and an after-connected sample hold block, a dividing unit for dividing the difference of said measuring light voltages formed in a difference amplifier by the sum of said measuring light voltages formed in a sum amplifier, and a low-pass filter and an analog-digital converter for applying said quotient to a look-up chart, said look-up chart supplying the value of the range.

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