Laser motion detector

OPT OpenIR > 半导体激光器专利数据库

	Laser motion detector
其他题名	Laser motion detector
	JOHN DOUGLAS LAMBKIN
	2008-05-14
专利权人	FIRECOMMS LIMITED
公开日期	2008-05-14
授权国家	英国
专利类型	发明申请
摘要	A velocimeter uses a self-mixing laser sensor. The laser 20 (e.g. a VCSEL) has an optical cavity (resonator) with an optical output face and a beam splitter (e.g. a distributed Bragg grating) integrated into the laser's output face. The beam splitter provides at least two output beams from the output face. One output beam 12 is used as a probe beam directed to a target surface 13 external to the sensor via a window 19. This is reflected by the target and mixed with the transmitted light In the laser cavity. A second output beam 15 is amplitude modulated by the Doppler shift of the reflected light and is used as a monitor beam directed to an optical detector 16 which measures the laser output power. From the measured output power, motion of the target surface relative to the sensor is determined. The transmitted light may be FMCW in order to find the range of the target surface. Four (fig. 5A, 6) or three (fig. 10, 11) beams allow measurement of movement in two directions. The velocimeter may be used to sense movement of a finger on a touch-pad (fig. 14).
其他摘要	速度计使用自混合激光传感器。激光器20（例如VCSEL）具有光学腔（谐振器），其具有光学输出面和集成在激光器输出面中的分束器（例如分布式布拉格光栅）。分束器从输出面提供至少两个输出光束。一个输出光束12用作通过窗口19指向传感器外部的目标表面13的探测光束。这由目标反射并与激光腔中的透射光混合。第二输出光束15通过反射光的多普勒频移进行幅度调制，并用作指向光学检测器16的监测光束，光学检测器16测量激光输出功率。根据测量的输出功率，确定目标表面相对于传感器的运动。透射光可以是FMCW，以便找到目标表面的范围。四个（图5A，6）或三个（图10,11）光束允许测量两个方向上的运动。速度计可用于感测手指在触摸板上的移动（图14）。
主权项	A self-mixing laser sensor comprising: a laser device having an optical cavity with an optical output face and a beam splitter integrated into the laser device for providing at least two output beams from the optical output facet, a first one of the output beams being a first probe beam for directing to a target surface external to the sensor and a second one of the output beams being a first monitor beam for directing to an optical detector; an optical detector for receiving said first monitor beam; a drive circuit for controlling the laser output; and a control circuit configured to determine, from the first monitor beam, motion of the target surface relative to the sensor as a function of self-mixing of a portion of the first probe beam returned to the optical cavity by reflection from the target surface.
申请日期	2006-11-09
专利号	GB2443662A
专利状态	失效
申请号	GB2006022354
公开（公告）号	GB2443662A
IPC 分类号	G01S17/58 \| G01P3/36
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/66311
专题	半导体激光器专利数据库
作者单位	FIRECOMMS LIMITED
推荐引用方式 GB/T 7714	JOHN DOUGLAS LAMBKIN. Laser motion detector. GB2443662A[P]. 2008-05-14.

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