Abstract: A distance measuring apparatus using a pulse laser light which has a wide measurement range and can execute high speed operation. The apparatus emits a pulsed light onto an object, receives a reflected pulsed light by a light receiving element, and amplifies an output thereof by a tuning amplifier. A sampling data of a damped oscillation wave form responding to the reflected pulsed light output from the tuning amplifier is added so as to be shifted by one cycle. Accordingly, it is possible to execute an enhancing process of a peak value utilizing a periodicity of the damped oscillation wave form responding to the pulsed signal, and it is possible to improve a detecting sensitivity of the reflected pulsed light.

Abstract: To provide a surveying instrument for measuring difference in required time of light or distance to an object to be measured while covering a wide dynamic range without adjusting light amount. A light pulse emanating from a light emitting section 1 is divided into a reference light cast to a reference light path F1 and a measurement light cast to a measurement light path F2 through which the measurement light travels to and is reflected back from the object to be measured. These two light beams are received with a light receiving section 9. With a multiplex reflection optical fiber Mp1 interposed in the middle of the measurement light path F2, the measurement light comes out as a row of multiplex light pulses attenuating successively in light amount at a constant rate. From this row of pulses, a measurement light of approximately the same in received light level as the reference light may be selected.

Abstract: A distance measuring apparatus using a pulse laser light which has a wide measurement range and can execute high speed operation. The apparatus emits a pulsed light onto an object, receives a reflected pulsed light by a light receiving element, and amplifies an output thereof by a tuning amplifier. A sampling data of a damped oscillation wave form responding to the reflected pulsed light output from the tuning amplifier is added so as to be shifted by one cycle. Accordingly, it is possible to execute an enhancing process of a peak value utilizing a periodicity of the damped oscillation wave form responding to the pulsed signal, and it is possible to improve a detecting sensitivity of the reflected pulsed light.

Abstract: The present invention relates to a light-wave rangefinder using a pulse method, which can reduce a measurement error, in which a tuned amplifier converts an electric signal of a light receiving unit into a damped oscillation waveform and thereby an arithmetic processing means can calculate a distance from a measuring position to a reflecting object on the basis of the damped oscillation waveform of the tuned amplifier. An optical noise sampling unit samples an optical noise produced in the rangefinder; an optical-noise storage unit stores sampling data of the optical-noise sampling unit; an arithmetic processing means reduces a measurement error caused by an optical noise on the basis of the sampling data of the optical-noise storage unit; and thereby a distance, a measurement error of which is reduced, can be calculated.

Abstract: The present invention relates to a light-wave rangefinder using a pulse method, which can reduce a measurement error, in which a tuned amplifier converts an electric signal of a light receiving unit into a damped oscillation waveform and thereby an arithmetic processing means can calculate a distance from a measuring position to a reflecting object on the basis of the damped oscillation waveform of the tuned amplifier. An optical noise sampling unit samples an optical noise produced in the rangefinder; an optical-noise storage unit stores sampling data of the optical-noise sampling unit; an arithmetic processing means reduces a measurement error caused by an optical noise on the basis of the sampling data of the optical-noise storage unit; and thereby a distance, a measurement error of which is reduced, can be calculated.

Abstract: The present invention relates to a distance measuring apparatus having an attenuation filter for adjusting luminous energy of a luminous flux incident on light receiving converting means. An object of the present invention is to provide a distance measuring apparatus in which at least a part of the attenuation filter is arranged as deflection means. According to the arrangement of the distance measuring apparatus of the present invention, a light projecting system irradiates a measuring luminous flux toward an object under measurement, a light receiving system receives the reflected luminous flux reflected on the object under measurement and leading the reflected light to light receiving converting means, and a distance from a position at which measurement is carried out to a position at which the object under measurement is located, is measured based on the reflected luminous flux received by the light receiving converting means.

Abstract: A surveying system which comprises a light source section for emitting laser beam, a rotational portion for rotating the laser beam from the light source in horizontal direction, a light source driving section for driving the light source unit, a survey instrument main unit having a light receiving unit for receiving the reflected laser beam, and a reflecting object for reflecting the laser beam irradiated from the survey instrument main unit main unit of the survey instrument.

Abstract: There is provided a surveying apparatus for detecting an object reflector (102) and measuring a distance from the object reflector (102) based on a luminous flux reflected by the object reflector (102) by irradiating a luminous flux toward the object reflector which varies a direction of polarization of reflected rays relative to that of incident rays.