公开(公告)号：US20080043242A1

公开(公告)日：2008-02-21

申请号：US11572125

申请日：2005-07-07

申请人： Gregory Emmerson ,  Corin Barry Gawith ,  Peter Smith

发明人： Gregory Emmerson ,  Corin Barry Gawith ,  Peter Smith

IPC分类号： G01B9/02

CPC分类号： G01N21/4133 ,  G01N21/553

摘要： An optical sensor comprises a sensing element comprising a waveguide grating with a response that varies with an effective modal index experienced by light propagating in the grating and a sample window for receiving fluid which affects the effective modal index to modify the response, the sensing element arranged to receive light from a light source and to output the light after filtering; and an analysing element comprising a second waveguide grating having a second response, and arranged to receive light output by the sensing element and to output the light after filtering for detection by an optical power detector. The combination of the two gratings converts changes in the wavelength of light output by the sensing element in response to the sample of fluid to changes in the amount of light, allowing the fluid index to be deduced from a measurement of optical power. The two elements may be fabricated on a single substrate to reduce errors from environmental disturbances such as temperature changes.

摘要翻译： 光学传感器包括感测元件，该感测元件包括波导光栅，其具有随着在光栅中传播的光所经历的有效模式指数而变化的响应，以及用于接收影响有效模态指数以改变响应的流体的样本窗口，所述感测元件布置 从光源接收光并过滤后输出光; 以及分析元件，包括具有第二响应的第二波导光栅，并且被布置成接收由所述感测元件输出的光，并且在滤光之后输出所述光以由光功率检测器进行检测。 两个光栅的组合将响应于流体样品的感测元件的光输出波长的变化转换成光量的变化，允许从光功率的测量推导出流体指数。 两个元件可以在单个基板上制造以减少诸如温度变化的环境干扰的误差。