发明名称 |
Laser diode distance measurement |
摘要 |
A laser diode distance measurement device includes a laser diode 10 which emits light 20 to a lens 22 which provides focussed light 24 incident on a target 26. The light 24 is reflected from the target 26 back to the laser diode 10 which causes the laser diode 10 to emit a light 28 which exhibits intensity pulses (due to coherent interference) related to the distance L to the target 26. A photodetector 30 provides a feedback signal indicative of the intensity of the light 28 to a distance measurement circuit 18. The laser diode 10 is driven by an up-ramp signal that reduces electronic processing and at a frequency that reduces speckle noise. The distance measurement circuit 18 blanks-out a portion of the feedback signal during discontinuities of the laser diode drive signal to minimize associated noise from distorting the distance measurement.
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申请公布号 |
US5267016(A) |
申请公布日期 |
1993.11.30 |
申请号 |
US19910800335 |
申请日期 |
1991.11.27 |
申请人 |
UNITED TECHNOLOGIES CORPORATION |
发明人 |
MEINZER, RICHARD A.;ZEPKE, BRUCE E. |
分类号 |
G01S7/48;G01S7/481;G01S17/32;G01S17/93;(IPC1-7):G01B11/02 |
主分类号 |
G01S7/48 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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