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Handheld laser distance measuring device using an impulse back-mixing method

一种激光测距、采样脉冲的技术，应用在手提激光测距设备领域，能够解决无法确定距离等问题

Active Publication Date: 2009-01-21
HILTI AG
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  • Application Information

AI Technical Summary

Problems solved by technology

The pulse repetition frequency of the laser pulse in the range of 50MHz to 200MHz is very high compared with the pulse repetition frequency of tens of kHz in the traditional pulse portable laser distance measuring equipment, so that it is usually impossible to use one measurement at a specific fixed pulse repetition frequency Uniquely determine distances up to a distance of several hundred meters

Method used

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  • Handheld laser distance measuring device using an impulse back-mixing method

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Embodiment Construction

[0024]According to FIG. 1, the pulse remixing-hand-held laser distance measuring device 1 has a control device 2 in the form of a microcontroller for passing the reference distance 6 inside the device by the measuring pulse 4 reflected by the measured object and the transmitted pulse 7 emitted optically The distance D to the measurement object 3 is calculated from at least one available time difference between the reference pulses 6 of , which repeats periodically at the pulse repetition frequency f. Furthermore, there is a controlled local oscillator 8 for generating the transmit pulse 7 with a pulse repetition frequency f, and two delay circuits 9a, 9b which can be variably controlled by the control device 2, wherein the first delay circuit 9a is arranged locally Between the oscillator 8 and the photodetector 10 , and for sampling the measurement pulse and the reference pulse, a sampling pulse 11 is generated that is delayed relative to the transmission pulse 7 . A second de...

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Abstract

A hand-held laser distance measuring device (1) with pulse reflection mixing includes a control device (2) for calculating the distance (D) to a measurement object (3) over at least one determinable periodic, with a pulse repetition frequency (f), time difference (tau) between a measurement pulse (4) reflected at the measurement object (3) and a reference pulse (6) of an optically emitted transmitting pulse (7) traveling over a reference distance (5) within the device, a local oscillator (8) for generating the transmitting pulse (7) at the pulse repetition frequency (f), at least one delay circuit (9a, 9b) which can be controlled by the control device (2), is arranged between the local oscillator (8) and a light detector (10) and / or a light transmitter (12), and generates a delay between the scanning pulses (11) and the transmitting pulses (7) in order to scan the measurement pulse (4) and the reference pulse (6). Alos a corresponding measuring method is described.

Description

technical field [0001] The invention relates to a portable laser distance measuring device adopting a pulse remixing method, in particular to a portable laser distance measuring device for construction. Background technique [0002] In the construction industry, distances need to be precisely determined with an accuracy of a few millimeters over distances of up to several hundred meters. Hand-held laser distance measuring devices suitable for this, to which the present invention is concerned, use pulse remixing of modulated visible laser beams for distance measurement. [0003] DE10112833C1 discloses a hand-held laser distance measuring device using the pulse remixing method. In this portable laser distance measuring device using the pulse remixing method, a commercially available laser diode is used as the laser source, which emits in the visible red wavelength range. The emitted laser light is modulated by a very narrow needle-like pulse sequence (also referred to below ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/483G01S17/10G01S7/486
CPCG01S7/497G01S17/10G01S7/486
Inventor G·托斯敦W·安德烈亚斯S·赫尔穆特
Owner HILTI AG
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