Topcon Corporation

Kabushiki Kaisha Topcon

Masae Matsumoto

Naoki Shoji

Ken-ichiro Yoshino

Fumio Ohtomo

Kaoru Kumagai

Tadayuki Ito

Mitsuru Kanokogi

Masaho Kikuchi

Jun Abe

Fumitoshi Kasahara

Ken-Ichiro Yoshino

The inclination sensor includes a gimbal mechanism rotatably supported around a first shaft and a second shaft, a first motor, a second motor, an acceleration sensor disposed in the gimbal mechanism with an origin point of coordinate axes being coincident with a point of intersection of a shaft center of the first shaft and a shaft center of the second shaft, and a control unit that simultaneously rotates the first shaft and the second shaft to continuously rotate the acceleration sensor around the first shaft and the second shaft and applies frequency analysis to the output values from the acceleration sensor to arithmetically determine the inclination angle with respect to the horizontal direction.

Inclination sensor and data acquisition device

An electro-optical distance measurement method includes: a light emitting step of switchably outputting a first distance measuring light and a second distance measuring light; a photodetection step of receiving a first reflected distance measuring light and a second reflected distance measuring light; an arithmetic step of frequency-converting a photodetection signal to generate a first difference frequency signal and a second difference frequency signal; and a determining step of determining whether identification information indicating a host device is included in the photodetection signal, wherein the light emitting step involves driving a light emitting element so that the identification information is included in a light emission signal, and the arithmetic step involves calculating the distance value when it is determined in the determining step that the identification information is included in the photodetection signal.

Electro-optical distance meter and electro-optical distance measurement method

An electronic distance meter comprises a distance measuring light projecting module, a photodetector, a photodetection circuit, and a control arithmetic module, wherein the distance measuring light projecting module has a light emitter, the light emitter emits a distance measuring light, the photodetector receives a reflected distance measuring light from an object to be measured and produces photodetection signals, the photodetection circuit generates an intermediate frequency signal based on the photodetection signals, and the control arithmetic module controls the photodetection circuit and calculates a distance to the object to be measured based on each of the photodetection signals, and wherein the control arithmetic module coincides a frequency orthogonal to a frequency which a sampling signal has with a frequency of a feedback signal on a curve, which is acquired by performing a DFT processing on the sampling signal acquired by sampling the intermediate frequency signal.

Electronic distance meter and modulated frequency determination method of feedback signal

A phase difference frequency generating method comprising: cutting out a reference signal, which is a continuous signal with a predetermined frequency, in a predetermined time and at a predetermined time interval by a signal for intermitting and creating a first intermittent signal, shifting the signal for intermitting by a time corresponding to &#x3c0;/a (a=natural number) of a fundamental frequency of the reference signal, cutting out the reference signal in the predetermined time and at the predetermined time interval by the signal for intermitting as shifted and creating a second intermittent signal, and carrying out a restoration processing for restoring the second intermittent signal by a time as shifted.

Phase difference frequency generating method, phase difference frequency generating device and electronic distance meter

A laser scanner comprises a light projecting optical system for projecting a distance measuring light, a deflecting optical member for deflecting and projecting the distance measuring light to a measurement area, a distance measuring unit for carrying out measurement based on a reflection light and for acquiring distance data of the measurement area, a second image pickup unit capable of continuously acquiring image data including the measurement area, and a control unit. The control unit has a first image processing unit for acquiring a three-dimensional image based on the image data and on the distance data, and also has a second image processing unit for detecting a mobile object by comparing image data being adjacent to each other in terms of time. The control unit controls the distance measuring unit so that measurement of the mobile object detected in the measurement area is restricted by the second image processing unit.

Laser scanner and method for detecting mobile object

An electronic distance measuring instrument comprises a pulsed light emitting light source, means for creating a distance measuring pulsed light and an internal reference pulsed light, a photodetector for detecting the pulsed lights, and a measuring unit for calculating a distance to an object to be measured based on a photodetection signal. The measuring unit performs coarse distance measurement based on difference of photodetection time between the internal reference pulsed light and the distance measuring pulsed light, carries out Fourier function transform on photodetection waveform of the pulsed lights respectively, separates the waveforms to a plurality of frequency components, obtains phase difference for each of the frequency components acquired, performs fine distance measurement based on time difference acquired from phase difference, and measures a distance to the object by adding a result of coarse distance measurement to a result of fine distance measurement.

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Tokyo-to, Japan

Masae Matsumoto