Back to results
US 6,226,077 B1Granted
Self-calibrating precision timing circuit and method for a laser range finder
AssigneeLaser Technology, Inc.
InventorJeremy G. Dunne
Life of this patent
Estimating the term…
Abstract
A highly precise range measurement instrument is made possible through the use of a novel and efficient precision timing circuit which makes use of the instrument's internal central processing unit crystal oscillator. A multi-point calibration function includes the determination of a “zero” value and a “cal” value through the addition of a known calibrated pulse width thereby providing the origin and scale for determining distance with the constant linear discharge of capacitor.
Claims13
A laser range finder comprising:
- a laser transmitting section for producing a series of transmitted laser pulses directable towards a target and producing a plurality of returned laser pulses at least partially reflected therefrom in response thereto;
- a laser receiving section for receiving said plurality of returned laser pulses and noise pulses, said laser receiving section comprising a laser signal receiving device coupled to an input of a transimpedance amplifier, said transimpedance amplifier providing an amplified output signal of said laser signal receiving device for input to a comparator circuit for providing an automatic noise threshold adjustment to said laser receiving section to facilitate discrimination between said returned laser pulses and said noise pulses;
- a central processing section coupled to said laser transmitting and laser receiving sections for determining a distance to said target based on a time of flight of said transmitted and returned laser pulses;
- and
- a user viewable display coupled to said central processing section for displaying said distance to said target.
2 more elements
Dependencies are inferred from the claim text.