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Method and device for measuring distances

A technology of distance measuring device and distance measuring method, which is applied in the direction of measuring device, measuring distance, line-of-sight measurement, etc., which can solve the problems of narrowing of measuring range, troublesome measurement, shortening of time interval, etc., and achieve the effect of high signal-to-noise ratio

Inactive Publication Date: 2003-10-15
LEICA GEOSYSTEMS AG
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Problems solved by technology

However, the shortening of the time interval has the disadvantage that the measuring range within which the distance can be determined with ideal accuracy is reduced
Therefore, at the high modulation frequencies used for precise measurements, rough distances have to be measured with more effort

Method used

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  • Method and device for measuring distances
  • Method and device for measuring distances
  • Method and device for measuring distances

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Embodiment Construction

[0025] figure 1 Indicates the relationship between the wavelength of light and the output power of a laser diode. With the same pulse width and high peak power, the laser transitions in multiple ways. This shortens the coherence length of the emitted laser light, which is beneficial for the accuracy of distance measuring devices equipped with lasers. Advances in semiconductor technology allow signals to be generated and processed at increasingly higher frequencies. In ranging devices, these advanced techniques can be used to improve ranging device efficiency. These improvements could be shorter measuring times, more sophisticated distance measuring devices, larger active areas or devices getting smaller so that the optical receiving elements with smaller received signal levels are smaller. When the frequency is higher, the zero-crossing signal has a greater increase. In this way, the period of time in which noise signals impair the true measurement signal is shortened.

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Abstract

The invention relates to a method for measuring distances, based on the phase measurement of an optical measuring beam that is reflected or scattered by an object, on which the beam is sighted. According to said method, the measurement object is exposed to an optical measuring beam of modulated intensity emitted by a measuring device and is converted into electrical measurement signals. The signals are then compared with a reference signal that is generated from the detection and conversion of a portion of measuring light that has been guided on a known reference trajectory, in order to determine the distance between the measuring device and the measurement objet, based on the phase difference that has been determined. The emitted measuring beam is modulated in bursts and the measurement signal of the receiver is only evaluated during the active burst period. The invention also relates to devices for carrying out said method.

Description

technical field [0001] The invention relates to a ranging method and a device according to the preamble of independent method claim 1 and the preamble of independent device claim 11 . Background technique [0002] Such distance measuring devices are well known in the prior art. They have ranges of tens of meters and are often designed as hand-held devices. They are mainly used in architectural surveys or in interior structures such as are used for three-dimensional measurements of houses. Other uses of distance measuring devices are geodetic mapping and industrial surveying. The basic principle of distance measurement with known devices consists in evaluating the temporal variation of the characteristic parameters of the electromagnetic radiation beam emitted by the distance measuring device and returned by the targeted object. For this purpose, the distance measuring device is equipped with a transmitter for emitting intensity-modulated radiation. Hand-held devices are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48G01S7/484G01S7/491G01S7/4915G01S17/36
CPCG01S7/491G01S7/484G01S7/4915G01S17/36G01C3/00
Inventor 库尔特·吉格
Owner LEICA GEOSYSTEMS AG
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