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    • 2. 发明公开
    • CALIBRATION METHOD BASED ON SINGLE-WAVELENGTH AND DOUBLE-LASER-TUBE PHASE MEASUREMENT, AND DEVICE THEREOF
    • 基于单波长和双激光管相位测量的校准方法及其装置
    • EP3312632A1
    • 2018-04-25
    • EP16872153.8
    • 2016-08-25
    • Hongkong Sndway Instrument Company Limited
    • HE, Gang
    • G01S17/36G01S7/497
    • G01S17/36G01S7/4911G01S7/4915G01S7/4918G01S7/497
    • A calibration method and a calibration device based on single-wavelength double-laser-tube phase measurement are disclosed. The calibration method includes: (S1) generating an external light path via a laser automatic power control circuit through a high frequency modulation signal, sending the external light path to a measured target, reflecting the external light path back through the measured target and receiving the reflected external light path by a photoelectric receiving circuit; (S2) generating an internal light path via the laser automatic power control circuit through the high frequency modulation signal, directly sending the internal light path to the photoelectric receiving circuit, and receiving the internal light path through the photoelectric receiving circuit; and (S3) performing phase comparison between two paths of light waves respectively corresponding to the external light path and the internal light path which are received firstly and secondly by the photoelectric receiving circuit, and a reference phase signal through the photoelectric receiving circuit, calculating a distance phase, and outputting a signal whose base is eliminated. By means of the method, the phase error is compensated and calibrated, so that the effect of environmental factors on the distance measurement error is reduced, thereby improving the distance measurement precision of the laser ranging, and improving the distance measurement stability of the system.
    • 公开了基于单波长双激光管相位测量的校准方法和校准装置。 该校准方法包括:(S1)通过高频调制信号经由激光自动功率控制电路产生外部光路,将外部光路发送至测量目标,将外部光路反射回测量目标并接收 通过光电接收电路反射外部光路; (S2)通过所述高频调制信号经由所述激光器自动功率控制电路产生内部光路,将所述内部光路直接发送至所述光电接收电路,并通过所述光电接收电路接收所述内部光路; 以及(S3)通过所述光电接收电路第一次和第二次接收的分别对应于所述外部光路和所述内部光路的两个光波路径与通过所述光电接收电路的基准相位信号进行相位比较,计算 距离相位,并输出其基数被消除的信号。 通过该方法对相位误差进行补偿校准,减少了环境因素对距离测量误差的影响,提高了激光测距的测距精度,提高了系统的测距稳定性。
    • 7. 发明公开
    • ELECTRO-OPTICAL DISTANCE METER
    • 电光距离仪表
    • EP3064962A1
    • 2016-09-07
    • EP16157707.7
    • 2016-02-26
    • Kabushiki Kaisha Topcon
    • OHTOMO, FumioKUMAGAI, Kaoru
    • G01S17/36G01S7/491G01S17/10G01S7/497
    • G01S7/4865G01S7/4915G01S7/497G01S17/102G01S17/36
    • The invention provides an electro-optical distance meter comprising a light emitting element for emitting a distance measuring light, signal generators for generating two or more proximity frequencies, a modulation signal in which the two or more proximity frequencies are intermitted respectively and converted to pulses with a predetermined width, a projecting optical system for sequentially switching over and projecting intermittent modulated distance measuring light as converted to pulses with predetermined width by the modulation signal, a photodetection unit for receiving a reflected distance measuring light from an object to be measured and producing an intermittent photodetection signal with a predetermined pulse width, a reference signal generator for issuing reference frequency signals having a difference of a predetermined frequency respectively, a frequency converting unit for performing frequency conversion by mixing the intermittent photodetection signals from the photodetection unit and the reference frequency signals, corresponding to each intermittent frequency signals respectively and obtaining intermittent conversion signals with a pulse width, and an arithmetic control unit, wherein the pulse width of the intermittent photodetection signal is set up so as to be longer in a time duration than a period of the intermittent conversion signal, and in a case where the object to be measured is a moving object, the period of the intermittent photodetection signal is set to such speed that a phase change of the intermittent conversion signal due to moving of the moving object can be negligible, wherein the arithmetic control unit is configured so as to calculate a precise measurement distance value by obtaining the phase of the intermittent photodetection signal with respect to the two or more proximity frequencies, to calculate a coarse measurement distance value by obtaining a phase difference between the intermittent conversion signals, and to determine a distance by combining the coarse measurement distance value and the precise measurement distance value.
    • 本发明提供了一种电光测距仪,包括用于发射测距光的发光元件,用于产生两个或更多个接近频率的信号发生器,两个或更多个接近频率分别被中断并且被转换为脉冲的调制信号, 一个预定的宽度,一个投影光学系统,用于顺序切换并投射间歇调制的测距光,该间隔调制的测距光通过调制信号转换为具有预定宽度的脉冲;光检测单元,用于接收来自待测物体的反射距离测量光并产生 具有预定脉冲宽度的间歇式光电检测信号,用于分别发出具有预定频率差的基准频率信号的参考信号发生器,用于通过混合来自光电探测器的间歇式光电检测信号来执行频率转换的频率转换单元 以及分别对应于各个间歇频率信号并获得具有脉冲宽度的间歇转换信号的基准频率信号和基准频率信号,以及运算控制单元,其中间歇光检测信号的脉冲宽度被设置为在a 时间比间歇转换信号的周期短,并且在测量对象是运动对象的情况下,间歇光检测信号的周期被设置为这样的速度,即由于移动引起的间歇转换信号的相位变化 其中运算控制单元被配置为通过获得关于两个或更多个接近频率的间歇光检测信号的相位来计算精确测量距离值,以计算粗测量距离值 通过获得间歇转换信号之间的相位差来确定 结合粗测量距离值和精确测量距离值的距离。
    • 8. 发明公开
    • LASER RANGEFINDER AND METHOD OF MEASURING DISTANCE AND DIRECTION
    • VERFAHREN ZUR MESSUNG VON ABSTAND UND RICHTUNG的LASERENTFERNUNGSMESSER
    • EP2963441A1
    • 2016-01-06
    • EP15174836.5
    • 2015-07-01
    • Funai Electric Co., Ltd.Kyoto University
    • SETONO, ShingoHORIBE, RyusukeMURAYAMA, ManabuMASUDA, YuichiroHIRAI, TomohisaMUSHIMOTO, AtsushiMATSUNO, Fumitoshi
    • G01S7/497G01S17/42G01S7/481
    • G01S17/42G01S7/481G01S7/4817G01S7/4915G01S7/497
    • A laser rangefinder (10) includes: a MEMS mirror (23) that changes a traveling direction of laser light; a first photodetector (27) that reflects a portion of the laser light directed in a predetermined direction by the MEMS mirror and receives another portion of the laser light; a second photodetector (25) that receives first reflected light that is reflection of the laser light from a target object (40) outside an enclosure (11) and second reflected light that is reflection of the portion of the laser light from the first photodetector (27); and a signal processor (30) that calculates a distance from the laser rangefinder (10) to the target object (40) by subtracting, from a first distance from the laser diode (21) to the target object (40) calculated using the first reflected light, a second distance from the laser diode (21) to the first photodetector (27) calculated using the second reflected light, and calculates a direction of the target object (40) with respect to the laser rangefinder (10).
    • 激光测距仪(10)包括:改变激光行进方向的MEMS反射镜(23); 第一光电检测器(27),其通过MEMS反射镜反射沿预定方向指向的一部分激光,并接收另一部分激光; 第二光电检测器(25),其接收来自外壳(11)外部的目标物体(40)的激光的反射的第一反射光和作为来自第一光电检测器的部分激光的反射的第二反射光 27); 以及信号处理器(30),其通过从使用所述第一激光二极管(21)计算出的从所述激光二极管(21)到所述目标物体(40)的第一距离减去从所述激光测距仪(10)到所述目标物体(40) 反射光,从激光二极管(21)到使用第二反射光计算的第一光电检测器(27)的第二距离,并且计算目标物体(40)相对于激光测距仪(10)的方向。