Abstract A device for electro-optical distance measurement comprising a signal transmitter for modulated electromagnetic waves of the type included in the transmission range of the eye, such as ultraviolet, infrared and visible light, and a receiver with a detector which is sensitive to such waves, and an alignment device, which makes it possible by means of the eye to align the device to the far point of the measuring distance, and analyzers connected to the transmitter and the receiver for the evaluation of the distance measured, wherein the detector and the signal transmitter are linked together by means of a control circuit by means of which the mean level of the signal received is adapted to control the mean intensity of the signal transmitted so that the mean level of the signal received is always maintained within a certain range of values sufficient for the detector independently of the length of the measuring distance, so that any unnecessary radiation effect on the aligning eye is prevented.
A device for electro-optical distance measurement comprising a signal transmitter for modulated electro-magnetic waves in the transmission range of the eye, a receiver with a detector which is sensitive to said waves, an analyzer connected to the transmitter and the receiver for the evaluation of the distance measured, said detector and signal transmitter being linked together by means of a control circuit by which the mean level of the signal received in said detector is adapted to control the mean intensity of the signal transmitted by said signal transmitter so that the mean level of the signal received is always maintained within a certain range of values sufficient for said detector independently of the length of the measuring distance, wherein said control circuit is operative such that the mean level of the information-carrying frequency of the signal received controls the mean intensity of the signal transmitted by said signal transmitter.
Claim 2
Independent Claim
150 words
A device for electro-optical distance measurement comprising a signal transmitter for modulated electro-magnetic waves in the transmission range of the eye, a receiver with a detector which is sensitive to said waves, an analyzer connected to the transmitter and the receiver for the evaluation of the distance measured, said detector and signal transmitter being linked together by means of a control circuit by which the mean level of the signal received in said detector is adapted to control the mean intensity of the signal transmitted by said signal transmitter so that the mean level of the signal received is always maintained within a certain range of values sufficient for said detector independently of the length of the measuring distance, wherein said control circuit is operative such that the mean level of the information-carrying frequency of the signal received controls the mean intensity of the signal transmitted by said signal transmitter.
Claim 3
Dependent Claim
51 words
A device in accordance with claim 1 wherein said modulation of the signal transmitted by said signal transmitter is accomplished by a modulating voltage with the mean intensity of the signal transmitted by said signal transmitter being controlled by the modulating voltage in accordance with the signal received by said detector.
Claim 4
Dependent Claim
22 words
A device in accordance with claim 2, wherein the signal received by said detector also controls the amplitude of the modulating voltage.