A dual-wavelength pulse-mixed phase laser rangefinder
A laser rangefinder, dual-wavelength laser technology, applied in radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of overlapping reference signals and measurement, long error reporting and measurement time, etc., to solve the problem of overlapping measurement and reference pulses , the effect of fast measurement speed and strong ranging ability
Active Publication Date: 2019-09-10
JIANGSU LAITZ MEASURING& CONTROL TECH CO LTD +1
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Problems solved by technology
[0007] 2. When measuring at close range, the reference signal and the measurement will inevitably overlap
[0008] The above problems require the control unit to make judgments and avoid overlapping areas to obtain favorable waveforms, which will lead to errors at certain distances or longer measurement times
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[0054] See image 3 . In one embodiment of the present invention, the control unit is set, and its microprocessor drives the dual-wavelength laser tubes in the emitting device through the clock 1 to obtain the laser light of the required wavelength. The laser signal is a pulsed optical signal with a periodic repetition frequency, wherein A laser beam of one wavelength is sent to the measured target as a measuring beam through the color filter 1 and is reflected, passes through the focusing lens and the color filter 3 in the receiving device, and projects to the photosensitive element in the receiving device driven by the clock 2, such as On the APD, a measurement pulse is formed, and another wavelength of laser light is used as a reference beam, which cannot penetrate the color filter 1, but after being reflected by the color filter 1, it can pass through the color filter 2 and project on the photosensitive element driven by the clock 2, such as On the APD, a reference pulse ...
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The invention provides a dual-wavelength pulse mixing phase type laser range finder, which comprises a microprocessor, a clock 1, a clock 2, a dual-wavelength laser tube, a color filter 1, a color filter 2, a color filter 3 and a photosensor. The internal and external optical paths of the laser range finder are separated by the dual-wavelength laser tube. A reference signal and a measurement signal are established by means of the color filters, and a frequency difference is provided by the clock 1 and the clock 2. Meanwhile, a measurement result is calculated by the microprocessor. According to the technical scheme of the laser range finder, the internal and external optical paths of the laser range finder are separated by the dual-wavelength laser tube. Meanwhile, based on the design of a dual-wavelength time-sharing circuit, the fast measurement is realized without additionally switching the optical paths. Moreover, the dual-wavelength pulse mixing phase type laser range finder is low in cost.
Description
technical field [0001] The invention describes a dual-wavelength pulse mixing phase type laser rangefinder, which belongs to the technical field of laser rangefinder. Background technique [0002] There are two ways to implement the handheld phase laser rangefinder, one is the sinusoidal phase measurement method represented by Leica; the other is the pulse phase measurement method represented by HILTI. See US Patent No. 6,917,415. [0003] Comparing these two technologies, the pulse phase is superior to the pure sinusoidal phase technology in terms of distance measurement, measurement accuracy, power consumption, speed measurement, etc. Therefore, Leica later developed a distance measurement technology involving pulse phase, see US Patent Publication US 20080304043A1. But that technology eventually turned into Power Range Technology TM technology, see US Patent Publication US20100296078A1. [0004] The pulse phase technology of HILTI was first announced in 2002, and was ...
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IPC IPC(8): G01S17/10
Inventor 乔佰文
Owner JIANGSU LAITZ MEASURING& CONTROL TECH CO LTD