Method of measuring the distance of a target and apparatus for its performance
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01C-003/08
출원번호
US-0885335
(1986-07-11)
우선권정보
DE-3122806 (1981-06-09); DE-3219423 (1982-05-24)
발명자
/ 주소
Blkow Ludwig (Grnwald DEX) Mehnert Walter (Ottobrunn DEX) Chaborski Hoiko (Munich DEX)
출원인 / 주소
MTC Messtechnik und Optelektronik AG (Neuchatel CHX 03)
인용정보
피인용 횟수 :
71인용 특허 :
2
초록▼
The distance of a target object is determined from the time of travel of a measuring light pulse which is emitted by a transmitter toward the target object, reflected thereby and received by a receiver. In timed relation with the instant of generation of the measuring light pulse, a start signal for
The distance of a target object is determined from the time of travel of a measuring light pulse which is emitted by a transmitter toward the target object, reflected thereby and received by a receiver. In timed relation with the instant of generation of the measuring light pulse, a start signal for beginning a measuring signal transit time measurement is generated, and, on receipt of the reflected measuring light pulse, a stop signal is generated for terminating this time measurement. A completely independent reference light pulse is generated and forwarded along a reference light path establishing a predetermined time of travel from the transmitter to the receiver, and the respective reference signal transit time is measured which contains the same undesirable additional time spans contained in the measured transit time of the measuring signal. The reference signal transit time measurement value is subtracted from the measuring signal transit time value to eliminate the additional time spans and to obtain a high precision measurement value difference to which the predetermined time of travel of the reference light pulse is added to obtain the genuine time of travel of the measuring light pulse.
대표청구항▼
A method of measuring the distance of a target from a measuring appartus by determining the time of travel of individual unmodulated measuring light pulses of short duration to said target and therefrom, by reflection, back to the measuring apparatus, comprising the steps of: (a) providing an electr
A method of measuring the distance of a target from a measuring appartus by determining the time of travel of individual unmodulated measuring light pulses of short duration to said target and therefrom, by reflection, back to the measuring apparatus, comprising the steps of: (a) providing an electro-optical transmitter means for generating individual unmodulated light pulses in response to trigger signals provided from a trigger generator, (b) generating for each individual unmodulated light pulse a start signal being related in time to the instant of generation of said light pulse, (c) providing means for using said individual unmodulated light pulses either as individual measuring light pulses by forwardly them along a first light path inside the apparatus toward an optical transmitting means transmitting them toward said target, or using them as individual reference light pulses by forwarding them inside that apparatus along a reference light path establishing a predetermined time of travel for said individual reference light pulses, (d) providing an electro-optical receiving means for receiving said individual measuring light pulses after reflection from said target as well as said individual reference light pulses, and for generating on receipt of each individual measuring light pulse and of each individual reference light pulse a respective stop signal, (e) generating at least one individual measuring light pulse and measuring a measuring signal transit time, i.e. the time distance between a start signal and a stop signal both signals corresponding to said measuring light pulse, said measuring signal transit time comprising three components, a first of which is the time span between the instant at which the measuring light pulse is generated and the instant at which the time distance measurement is actually started, a second of which is the time of travel of the measuring light pulse beginning with the instant at which said measuring light pulse is actually generated by said electro-optical transmitter means and ending with the instant at which, after reflection from the target, said measuring light pulse is received by said electro-optical receiving means, and a third of which is the time span between the instant at which said measuring light pulse is received by said electro-optical receiving means and the instant at which said time distance measurement is actually stopped, (f) generating at least one individual reference light pulse and measuring a reference signal transit time, i.e. the time distance between a start signal and a stop signal both signals corresponding to said reference light pulse, said reference signal transit time comprising three components, a first of which is the time span between the instant at which the reference light pulse is generated and the instant at which the time distance measurement is actually started, a second of which is the predetermined time of travel of the reference light pulse beginning with the instant at which said reference light pulse is actually generated by said electro-optical transmitter means and ending with the instant at which, after having travelled through said reference light path, said reference light pulse is received by said electro-optical receiving means, and a third of which is the time span between the instant at which said reference light pulse is received by said electro-optical receiving means and the instant at which said time distance measurement is actually stopped, (g) determining a measurement value difference which comprises the difference between the time of travel of said at least one measuring light pulse and the predetermined time of travel of said at least one reference light pulse and from which said first and said third components of said signal transit time measurement values are eliminated, and (h) adding to said measurement value difference said predetermined time of travel established by said reference light path and multiplying the result by the velocity of light in order to obtain one distance measurement value.
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