公开(公告)号：US20160123806A1

公开(公告)日：2016-05-05

申请号：US14896556

申请日：2014-06-04

Applicant: BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM

Inventor： Philip Varghese ,  Manfred Fink

IPC: G01J3/02 ,  G01J3/44

CPC classification number: G01J3/0205 ,  G01J3/0208 ,  G01J3/0264 ,  G01J3/4412 ,  G01J2003/1213

Abstract: Raman scattering, while a powerful and versatile technique, relies of the detection of weak signals. Detecting the signal can be difficult if there is interference, especially if the interference comes from scattered stray light of the laser used to generate the Raman signal. Described here is a frequency modulation technique in combination with heterodyne detection that simultaneously rejects interference from ambient light as well as from scattered stray laser light. This provides a means to detect Raman signal and discriminate against scattered light without using an expensive and bulky spectrometer.

Abstract translation: 拉曼散射虽然功能强大，功能多样，但依赖于弱信号的检测。 如果存在干扰，检测信号可能很困难，特别是如果干扰来自用于产生拉曼信号的激光的散射杂散光。 这里描述的是与外差检测相结合的频率调制技术，其同时抑制来自环境光的干扰以及散射的杂散激光。 这提供了一种检测拉曼信号并且不使用昂贵和庞大的光谱仪来区分散射光的手段。