Unlock instant, AI-driven research and patent intelligence for your innovation.

Interferometric sensor with differential modulated phase detection

A sensor and detector technology, applied in converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve problems such as difficulty in realizing interactive optical design

Active Publication Date: 2017-05-31
ABB POWER GRIDS SWITZERLAND AG
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for sensors in which the sensing element is not an optical fiber but, for example, a bulk element, an interactive optical design with a fiber-coupled optical phase modulator is rather difficult to implement
That's because, after passing through the bulk optical sensing element, the light must be coupled back into a single-mode fiber (the same fiber that precedes the sensing element in a reflective configuration), and doing so with high efficiency and reliability alone is considerable technical challenge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Interferometric sensor with differential modulated phase detection
  • Interferometric sensor with differential modulated phase detection
  • Interferometric sensor with differential modulated phase detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] An example of a basic differential MPD sensor according to the invention is in figure 1 shown in . A light source 1 generates light waves, which are guided to a fiber polarizer 2 via a single-mode fiber. The polarized light output passing through the 45° fiber splice 4 and carried in both axes of the PM fiber 3 passes through the optical phase modulator 5 to the fiber collimator 6 from which the light is coupled. A non-birefringence beam splitter 7 is located between the collimator and the sensing element 8 . One branch of the light output split by the beam splitter 7 passes through the first bulk linear polarizer 9-1 and is detected by the first photodetector 10-1. The other branch of the light output passes through the sensing element 8, the second bulk linear polarizer 9-2, and is detected by the second photodetector 10-2. The output signals of the two detectors 10 - 1 , 10 - 2 are input to a signal processing unit 11 . The optical axes of the sensing medium 8 ar...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A sensor is provided, with a sensing element (8) whereby a measurand induces a relative phase shift between two waves, a phase modulator (5) adding a modulation to the relative phase shift, at least two detectors (10-1,10-2), with a first detector (10-1) detecting an interference signal responsive to a relative phase shift not including the relative phase shift as induced by the measurand, and with a second detector (10-2) detecting an interference signal responsive to a relative phase shift including the relative phase shift as induced by the measurand, and further comprising a signal processing unit (11) adapted to analyze the two detected interference signals and to derive a measurand value therefrom.

Description

technical field [0001] The present invention relates to interferometric sensors using a modulated phase detection scheme. Background technique [0002] US 3707329 describes a device for analyzing a light beam modulated by a quantity to be measured. It contains a mechanical chopper that modulates the amplitude of the beam before it enters the electro-optic sensor. [0003] DE 19544778 describes a current sensor in which two sections of sensing fiber of different lengths would be wound around a conductor. [0004] Sensors relying on the interference between two waves, usually two orthogonally polarized modes of waves, are known and used in a wide range of technical fields (see references [1]-[7]). The relative phase shift between the detector signal of these sensors and the two waves The cosine correlation of . The phase shift can be detected using, for example, a polarimetric scheme. Such sensors typically require multiple detector channels (eg, two orthogonal polarimet...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26G01D5/353G01R15/24G01R33/032
CPCG01D5/266G01D5/353G01D5/35303G01R15/241G01R33/032G01R33/0327
Inventor 顾逊S.V.马彻塞K.博内特A.弗兰克
Owner ABB POWER GRIDS SWITZERLAND AG