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Light wave distance measuring apparatus

一种距离测量、光波的技术，应用在光波距离测量装置领域，能够解决昂贵等问题

Active Publication Date: 2009-09-09
HOKUYO AUTOMATIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of this, expensive analog-to-digital converters that are efficient at the frequency of the sampled signal are required

Method used

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  • Light wave distance measuring apparatus

Examples

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example 1

[0055] In order to prove the usability of the light wave distance measuring device of this embodiment, an example of actually measuring the distance of a target to be measured will be described below.

[0056] A quartz oscillator with an oscillation frequency of 13.3 MHz is used as the main oscillator 11 . The frequency from oscillator 11 is f 0 The oscillating signal is input to the first to third PLL circuits 12, 13 and 60, and is obtained through it with a frequency f 1 and f 2 Reference electrical signals in the form of sine wave signals of 46.7MHz and 13.3MHz respectively, and obtain sampled signals which have a frequency f s Two signals at 50MHz and phase shifted 90 degrees from each other. The frequency f of the reference electrical signal 1 and f 2 , and the frequency f of each sampled signal sEquation 2 is met, and n is 15 at this moment. The laser 15 is an infrared laser with a wavelength of 785nm. The amplitude of the laser beam is modulated by the reference...

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Abstract

A reference electrical signal oscillated by the main oscillator (11) has two kinds of frequencies (f1, f2) which are different from each other and any one of which is alternatively selected, a sampling signal is synchronized with the reference electrical signal once every n times, and a frequency (fs) of the sampling signal is an average value of the two kinds of frequencies (f1, f2) of the reference electrical signal, and the A / D conversion portion carries out at least one A / D conversion per period of the reference electrical signal and the received electrical signal based on the sampling signal.

Description

technical field [0001] The invention relates to a light wave distance measuring device for measuring the distance of a target to be measured by means of amplitude modulated light waves. Background technique [0002] As for various known light wave distance measuring devices, there is known a light wave distance measuring device using a time-of-flight (TOF) system, and a light wave distance measuring device using an amplitude modulation (AM) system. [0003] The working mode of the light wave distance measuring device using the TOF system is as follows: transmit the distance measuring light in the form of a pulse to the target to be measured, and receive the distance measuring light reflected by the target to be measured, according to the moment when the distance measuring light is emitted to the time when the distance measuring light is received The distance between the time delays of the measuring rays measures the distance of the object to be measured (see document JP 07-6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/36G01S7/4911G01S7/4915
CPCG01S7/4911G01S7/4915G01S17/36
Inventor 森利宏川田浩彦油田信一
Owner HOKUYO AUTOMATIC CO