Handheld laser ranging device

Abstract

The invention discloses a handheld laser ranging device, which comprises a laser transmitter, a DDS (Direct Digital Synthesizer) frequency generating module, an I / Q (In-phase / Quadrature) modulation module, an APD (Avalanche Photo Diode) frequency mixing receiving module, a low frequency amplifier module and a microcontroller module, wherein the laser transmitter transmits laser ranging signals to a to-be-measured object; the DDS frequency generating module provides the laser transmitter with high frequency modulation signals; the I / Q modulation module modulates the high frequency modulation signals and outputs the modulated signals; the APD frequency mixing receiving module receives the laser ranging signals that are sent back from the to-be-measured object, the laser ranging signals and the modulated signals are processed through frequency mixing, and low frequency signals with phase differences are output; the low frequency amplifier module converts the low frequency signals to low frequency voltage signals; and in addition, the microcontroller module generates and outputs I / Q signals, receives the low frequency voltage signals, processes the low frequency voltage signals through phase detection, and obtains distance signals of the to-be-measured object so as to output the distance signals. The handheld laser ranging device has the advantages of small size, low power consumption, accurate measurement, high speed and the like, and is especially suitable for the fields such as industrial setting, estate measurement, construction technology, upholstery.

Description

technical field [0001] The invention relates to the field of distance measuring devices, in particular to a hand-held laser distance measuring device based on laser and phase measurement. Background technique [0002] At present, the ranging error of the handheld phase-type laser ranging devices on the market is within ±3mm. The main products are LECIA from Switzerland, BOSCH and Xideli from Germany. This type of distance meter is mainly used in industrial installation, real estate measurement and other fields. It is characterized by high precision, measuring range generally less than 300m, small size, measurement without reflection, and more functions. It can perform various simple calculations, and some products can also directly transmit data with computers. Their characteristics are: (1) The lasers used are all semiconductor laser diodes, and the laser wavelength is between 405nm and 900nm. (2) Silicon photoelectric avalanche diode is used as the receiving tube, whic...

AI Technical Summary

Problems solved by technology

The size of the rangefinder itself is small, and the volume of the optical lens is required not to be too large, but at the same time, the convergence performance cannot be reduced. These constraints greatly increase the difficulty of manufacturing

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