Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter

A broadband light source and optical sensor technology, which is applied in the direction of using optical devices to transmit sensing components, light guides, fluid pressure measurement using optical methods, etc., can solve the problems of increasing the cost of measuring devices and reducing reliability, so as to increase sensitivity and reduce cost effect

Active Publication Date: 2010-10-27
浙江光尖电机技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These requirements have greatly increased the cost of the measurement device and reduced reliability

Method used

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  • Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter
  • Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter
  • Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter

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Embodiment 1

[0033] figure 2 It is a schematic diagram of the first embodiment of the present invention. It includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference ring resonator 10 coupled with the input waveguide 1, a connection waveguide 3 coupled with the reference ring resonator 10, and a transmission waveguide coupled with the connection waveguide 3. Sensing ring resonator 20, output waveguide 2 coupled with sensing resonator 20, power meter 41 for measuring the output power at the other end of input waveguide 1, and power meter 42 for measuring the output power of output waveguide 2, the reference ring resonator 10 Unlike the optical length of the sensing ring resonator 20, the optical length of the reference ring resonator 10 is such that its resonant frequency corresponds to a series of equally spaced operating frequencies, the optical length of the sensing ring resonator 20 is such that When one of its resonant frequencies ...

Embodiment 2

[0058] Figure 8 It is a structural schematic diagram of the second embodiment of the present invention. It includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference ring resonator 10 coupled with the input waveguide, a connection waveguide 3 coupled with the reference ring resonator 10, and a sensor coupled with the connection waveguide 3. Ring resonator 20, output waveguide 2 coupled with sensing resonator 20, optical power meter 41 for measuring the output power at the other end of input waveguide 1, and optical power meter 42 for measuring the output power of output waveguide 2, the reference ring resonator 10 is different from the optical length of the sensing ring resonator 20, the optical length of the reference ring resonator 10 makes its resonant frequency correspond to a series of equally spaced operating frequencies, the optical length of the sensing ring resonator 20 When one of its resonant frequencies overlaps...

Embodiment 3

[0062] The ring resonator among the present invention is to play the effect of an optical filter, has the advantage of high quality factor (Q value), but the ring resonator can be formed by a Mach-Zehnder (Mach-Zehnder) interferometer, array Filters such as waveguide gratings, Bragg gratings, or Fabry-Perot (Fabry-Perot) interferometers can be used instead, wherein the Fabry-Perot (Fabry-Perot) interferometer can be composed of two Bragg gratings.

[0063] Such as Figure 9 As shown, it includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference optical filter 101 coupled with the input waveguide, a connection waveguide 3 coupled with the reference optical filter 101, and a transmission waveguide coupled with the connection waveguide 3 A sensing optical filter 102, an output waveguide 2 coupled with the sensing optical filter 102, an optical power meter 42 for measuring output power, the transmission frequency of the reference...

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Abstract

The invention discloses a photo sensor based on the vernier effect of a broadband light source and a cascading optical waveguide filter, which comprises a broadband light source, an input waveguide, a connecting waveguide, an output waveguide, a reference ring-shaped resonant cavity coupled with the input waveguide and the connecting waveguide, a sensing ring-shaped resonant cavity coupled with the connecting waveguide and the output waveguide and two optical power meters. The sensing ring-shaped resonant cavity and the reference ring-shaped resonant cavity are different in optical length; adjacent resonance peaks are not coincident completely when one resonance frequency of the sensing ring-shaped resonant cavity is coincident with one resonance frequency of the reference ring-shaped resonant cavity. At least a part of waveguides in the sensing ring-shaped resonant cavity are influenced by a measured variable or at least a part of waveguides are in contact with a measured substance; the movement of a resonance line can be caused by measured variable influence or measured substance change; and the vernier effect of double resonant cavities can amplify the movement to be movement of total transmission spectrum envelop and can convert the movement into the change of transmission total output power, thereby detecting the measurement substance simply.

Description

technical field [0001] The invention relates to an optical waveguide sensor based on a cascaded ring cavity, in particular to an optical sensor based on a broadband light source and a cascaded optical waveguide filter vernier effect. Background technique [0002] As an important branch of information science and technology, optical sensing technology has very important applications in industrial process control, environmental monitoring, food safety and national security. Optical sensing technology can solve the problems of low sensitivity, susceptibility to interference, long sensing time and unsafe detection of certain chemical gases in electrical sensing technology. Optical sensors have the advantages of high sensitivity, small size, strong anti-electromagnetic interference ability, easy integration, and online detection, and they occupy an increasingly important position in the sensing field. [0003] The basic principle of the optical waveguide sensor device is based o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26G01L11/02G01K11/32G01N21/41G02B6/293
Inventor 金磊何建军李明宇
Owner 浙江光尖电机技术有限公司
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