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US 2001/0012104 A1Published application
Self-calibrating pricision timing circuit and method for a laser range finder
AssigneeLaser Technology, Inc.
InventorJeremy G. Dunne
Life of this patent
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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 instruments 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.
Claims1
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 at least a portion of said plurality of returned laser pulses;
- a central processing section coupled to said laser transmitting and laser receiving sections for determining a distance to said target based upon a time of flight of said transmitted and returned laser pulses;
- a user viewable display coupled to said central processing section for displaying said determined distance to said target;
- and
- a user actuatable mode switch coupled to said central processing section for indicating a specified distance less than which returned pulses from an object intervening between said laser range finder and said target will be ignored in said distance determination.
3 more elements
Dependencies are inferred from the claim text.