WO2020130790A1 - Dispositif capteur de guide d'ondes optiques multipoint et procédé de génération de signaux de fluorescence à longueurs d'onde d'émission distinctes - Google Patents

Dispositif capteur de guide d'ondes optiques multipoint et procédé de génération de signaux de fluorescence à longueurs d'onde d'émission distinctes Download PDF

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Publication number
WO2020130790A1
WO2020130790A1 PCT/MY2019/050112 MY2019050112W WO2020130790A1 WO 2020130790 A1 WO2020130790 A1 WO 2020130790A1 MY 2019050112 W MY2019050112 W MY 2019050112W WO 2020130790 A1 WO2020130790 A1 WO 2020130790A1
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WO
WIPO (PCT)
Prior art keywords
sensor
fluorescence
optical
specific wavelength
emission signals
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Application number
PCT/MY2019/050112
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English (en)
Inventor
Bin Saharudin SUHAIRI
Original Assignee
Mimos Berhad
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Publication of WO2020130790A1 publication Critical patent/WO2020130790A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides

Definitions

  • the present invention generally relates to optical waveguide with fluorescence material. More particularly, the invention relates to a multi-point optical waveguide sensor device and a method for generating a plurality of fluorescence signal with distinct emission wavelengths.
  • Optical waveguides or fibre optic cables with sensors are well known in the art.
  • a typical fiber optic sensor device positions the sensor material at a generally distal location in the waveguide. The device permits interaction between a parameter sensitive indicator and the sensor material being subjected to monitoring, measurement and/or detection.
  • Sensors can provide information about the properties of materials, like chemical sensors provide information about gasses and liquids.
  • the chemical sensors can provide information about the presence of certain elements or compounds in the environment in which the sensor is placed. Also, information about elements or compounds that may be brought in contact with the sensor is provided. Sensors may provide quantitative and qualitative information.
  • optical chemical sensors the information is obtained by or via an optical signal that is representative for the property to be measured or detected.
  • Optical sensors comprise a responsive element that, due to interaction with its environment, responses to changes in its environment, for example a change in optical properties such as refractive index or colour of a liquid.
  • waveguides with sensors use materials like fluorescent based material to sense several physical and chemical quantities such as oxygen, temperature, pH and glucose to name a few.
  • materials like fluorescent based material to sense several physical and chemical quantities such as oxygen, temperature, pH and glucose to name a few.
  • single-point optical fibre sensor available in the market utilising such material that responds to chemical quantities such as oxygen.
  • Single point optical waveguide sensor is adequate for deployment in in-situ environment where the sensing instrument and sensor element are located directly at the point of measurement interest. There are other instances where several measurements are required at multiple locations at the same time. Using single point sensor approach, each of the location would require a sensor and its measurement instruments.
  • One prior art document CN 201310115444 discloses a chemical sensor for remote multi point detection based on a long-period fiber grating.
  • a laser output end of an optical time domain reflector is optically connected with one end of a long-distance transmission optical fiber; a long-period optical fiber grating sensor is welded at different sensing points of the transmission optical fiber; a transmission spectrum drifts due to different peripheral chemical environments of a long-period optical fiber grating sensing head, and the drift variation and the outside chemical environment correspond to each other; when an optical pulse with specific wavelength passes through the long-period optical fiber grating sensing head in an optical link, the transmitted beam intensity is modulated, and back scattering signals in the optical link are demodulated through the optical time domain reflector so as to obtain light intensity change information of each sensing point, so that multi-point real time detection chemical sensing with long distance and distinguishable sensing distance is realized.
  • the chemical sensor based on the long period fiber grating aims to solve the problems that an optical grating sensor is short in measurement distance, narrow in range and high in cost and cannot realize multiplexing in the prior art, and has the advantages of being low in cost and simple in structure and being capable of realizing multi-point long distance and real-time detection.
  • the optical fiber multi -parameter water quality analyzer comprises a light source module, a sensing module and a signal processing display module, wherein the light source module, the sensing module and the signal processing display module are connected two by two; the sensing module comprises an optical fiber pH probe, an optical fiber dissolved oxygen probe, an optical fiber ammonia nitrogen probe and an optical fiber turbidity probe, which are respectively connected with the signal processing display module; and the optical fiber pH probe, the optical fiber dissolved oxygen probe and the optical fiber ammonia nitrogen probe are the fluorescent probes.
  • the optical fiber multi-parameter water quality analyzer based on the fluorescent probes has the advantages that parameter values of water quality, such as temperature, pH value, dissolved oxygen, ammonia nitrogen and turbidity, can be measured; measuring errors are reduced, and measuring accuracy is improved; and the optical fiber multi-parameter water quality analyzer has the characteristics of short response time, high sensitivity, low cost, high repeatability, miniaturization, commercialization and the like, and can work in the severe environment such as wet water surface and electromagnetic interference for a long time.
  • the present invention provides a method for generating a plurality of fluorescence signals with distinct emission wavelengths from a multipoint sensor optical waveguide.
  • the method comprises the steps of transmitting an excitation light source signal to a plurality of sensors with fluorescence material wherein the excitation light source signal is absorbed by the fluorescence material to release fluorescence emission signals with a light-wave spectrum, allowing the fluorescence emission signals to enter an optical filter configured to allow specific wavelength emission signals to pass, wherein each of the specific wavelength emission signals are distinct from each other and each of the specific wavelength emission signals are generated by applying a specific level of electrical energy to the filter and collecting the specific wavelength emission signals at a fluorescence collecting channel and allowing the emission signals to reach an optical detector, characterized in that adjusting the electrical energy applied to the optical filter for affecting wavelength tunability of each of the specific wavelength emission signals to ensure there is no overlapping of the specific wavelength emission signals.
  • the present invention provides a multi-point optical waveguide sensor device configured to generate a plurality of fluorescence signal with distinct emission wavelengths.
  • the device comprises a plurality of sensor modules with fluorescence material wherein each of the plurality of sensor modules is connected to an optical waveguide, an optical filter each connected to the sensor modules and configured to allow specific wavelength emission signals to pass, wherein each of the specific wavelength emission signals are distinct from each other and each of the specific wavelength emission signals are generated by applying a specific level of electrical energy to the filter, and an optical detector configured for receiving and detecting the fluorescence signal with distinct emission wavelengths, characterized in that the electrical energy applied to the optical filter is adjusted to affect wavelength tunability of each of the specific wavelength emission signals to ensure there is no overlapping of the specific wavelength emission signals.
  • the optical waveguide comprises an excitation light transmission channel configured to guide an excitation light through the waveguide, a fluorescence collecting channel configured to collect the plurality of fluorescence signal with distinct emission wavelength, and a power light source channel sandwiched between the excitation light transmission channel and the fluorescence collecting channel wherein the light source channel is configured to guide a power light through the waveguide.
  • the device includes a CD (coding-decoding) module for accessing the fluorescence light received at the optical detector to determine the emission wavelengths from each sensor.
  • CD coding-decoding
  • fluorescence material can be coated onto the sensitive region of an optical waveguide medium such as non-planar optical waveguide to form a sensor.
  • FIG. 1A shows an optical waveguide with plurality of sensor modules in accordance with an embodiment of the present invention.
  • FIG. IB shows an optical waveguide with three light channels in accordance with an embodiment of the present invention.
  • FIG. 1C shows a sensor module with three light channels and optical filter in accordance with an embodiment of the present invention.
  • FIG. ID shows the sensor module with broad emission spectrum in accordance with an embodiment of the present invention.
  • FIG. IE shows the sensor module with narrow emission spectrum after passing the optical filer in accordance with an embodiment of the present invention.
  • FIG. 2A shows graphs of fluorescence signal with no spectral overlap in accordance with an embodiment of the present invention.
  • FIG. 2B shows graphs of fluorescence signal with a spectral overlap in accordance with an embodiment of the present invention.
  • FIG. 3 shows optical waveguide and plurality of sensor module with address and power levels in accordance with an embodiment of the present invention
  • FIG. 4 depicts a method for generating a plurality of fluorescence signals with distinct emission wavelengths from a multipoint sensor optical waveguide in accordance with an embodiment of the present invention.
  • Various embodiment of the present invention provides a multi-point optical waveguide sensor device and a method for generating a plurality of fluorescence signal with distinct emission wavelengths.
  • the following description provides specific details of certain embodiments of the invention illustrated in the drawings to provide a thorough understanding of those embodiments. It should be recognized, however, that the present invention can be reflected in additional embodiments and the invention may be practiced without some of the details in the following description.
  • Embodiments described herein will refer to plan views and/or cross-sectional views by way of ideal schematic views. Accordingly, the views may be modified depending on simplistic assembling or manufacturing technologies and/or tolerances. Therefore, example embodiments are not limited to those shown in the views but include modifications in configurations formed on basis of assembling process. Therefore, regions exemplified in the figures have schematic properties and shapes of regions shown in the figures exemplify specific shapes or regions of elements, and do not limit the various embodiments including the example embodiments.
  • the various embodiments including the example embodiments relate to a multi-point optical waveguide sensor device and a method for generating a plurality of fluorescence signal with distinct emission wavelengths.
  • the present invention provides a method to generate several unique fluorescence emission wavelengths.
  • the seed fluorescence emission is obtained from fluorescence material which respond to the presence and absence of oxygen molecules.
  • the energy to the fluorescence material is provided optically using a light source that emits a signal with excitation wavelength for allowing maximum absorption of energy by the fluorescence material.
  • the fluorescence material upon receiving the energy releases the stored energy of the material after a lag period of time usually in nano-seconds and emit light signal with a different wavelength from the one provided by the excitation light source.
  • the emission spectra width of such signal from the chosen fluorescence material is usually broad and covers a wide spectral range.
  • the broad emission spectra enter an optical filter that is configured to allow only a segment of emission signal from the broad spectra emitting the filter to pass.
  • the material used in the optical filter is responsive to variation in electrical energy levels. By applying a specific electrical energy level to the filter material, a specific wavelength can be generated from the initial seed emission signal. Consequently, the measurement instrument for such sensor arrangement is able to interrogate and monitor changes in sensor parameter of interest.
  • a multipoint optical sensor device (100a) having an optical waveguide with plurality of sensor module is provided in accordance with an embodiment of the present invention.
  • the device (100a) comprises an excitation light source (101) coupled to a non-planar light-wave guide (103) type via a light guiding medium (102).
  • the non-planar light wave guide (103) is fabricated to comprise of three light transmitting channels, excitation light transmission channel (104), power light source channel (105) and fluorescence collecting channel (106) as shown in block diagram (100b) of FIG. IB.
  • Another light source (107) (referred to power light source hereafter) is coupled to the power light source channel (105) via a light guiding medium (108) within the non-planar light waveguide (103) structure.
  • the non-planar light-wave guide (103) is connected to sensor module (111) through means of connecting both materials such as fusion splicing, mechanical joining etc. Additional sensor modules such as sensor module (112) and (113) as an example can be placed within the system through this method.
  • Each of the sensor modules (111, 112, 113) include an optical filter (115).
  • a plurality of sensor module are fabricated to consist of 3 light transmitting channels (116, 117 and 118) with similar structure and position as light channels (104, 105, 106) within the light-wave guiding medium.
  • Excitation light source (101) and Power light source (107) launched at the input of guiding medium comprises of light wave with different wavelengths and does not interfere with each other event when travelling on/within the same optical guiding medium channel such as in waveguide (103).
  • This non-planar optical waveguide (103) is connected to sensor (111, 112 and 113) by an interface (comprises of coupling optics- not covered in this invention) which directs excitation light source (101) and power light source (107) to each respective channel (104, 105).
  • Fluorescence signal generated from the excitation light source (101) are collected at fluorescence collecting channel (106) and travels back to the same optical medium.
  • the emission signal generated from the filter (115) are with a different wavelength from excitation and power light source wavelengths. As such no interference between the signals occur inside waveguide (103) during the time when fluorescence signal travels back to input of waveguide (103).
  • a device which allows single-direction flow of light signal is placed in front of Excitation light source (101) and Power light source (107). This device will only allow light signal direction towards optical waveguide (103) via light guiding medium (102) and (108) and prevents incoming light signal from waveguide (103) to travel towards excitation light source (101) and Power light source (107). Consequently, fluorescence signal with specific wavelength travelling from optical waveguide (103), will be allowed to travel towards optical detector (110) via light guiding medium (109) as there is no similar device placed in front of optical detector 110.
  • the optical filter (115) is a special active material which responds to electrical signal to change its properties that affect the light passing through. It is sandwiched between excitation light transmitting channel (117) and fluorescence collecting channel (116).
  • the energy to drive the optical filter (115) is derived from power module (129) and can be varied to affect the wavelength tunability of light passing the optical filter (115).
  • the system initialises by excitation of fluorescence material (114) by excitation light source signal (119). Upon absorption of excitation light source signal (119), fluorescence material (114) releases fluorescence emission signal (120) with a broad light-wave spectrum (121). This signal (120) will pass through the optical filter (115) and allows specific wavelength signal (123) determined by the default setting of special active material (115) to pass. This signal (123) is collected at fluorescence collecting channel (125) and travels inside this channel. Signal (123) which is narrower than the excitation light source signal (119) appears at the detection end of the system. Similar process is repeated for sensor module (112 and 113). At the end of this initial phase of the system, wavelength from all sensor modules (111, 112, 113) are analyse for any spectral overlapping.
  • wavelength of narrow emission spectrum (126) is generated depends on the setting of the special active material (115) that obtains its power from power module material.
  • Power module (129) obtains its electrical energy from an opto- electro conversion module like a photovoltaic material (122) whose functions is to convert light to electrical energy. This electrical energy is fed to power module which energies sub-modules like signal conditioner (124) and coding-decoding module (128).
  • Sub-module performs the addressing translation of signal received from power light source (107).
  • Power light source channel 118 (FIG. 1C) are connected to non -planar optical waveguide 103 by an interface (comprises of coupling optics) which directs excitation and power light source to each respective channel (104) & (105) (FIG.1B).
  • the channel (118) is attached to a special active material (115) using optical fabrication process. Upon receiving energy from power light source with specific wavelength, electrical energy is generated from photovoltaic process and electrical current is provided to active devices in power module (129) through electrical wiring (non-optical connection).
  • the first scenario (200a) is when all signals received from sensor modules (111, 112, 113) are not overlapped. In this condition, no further adjustment of electrical energy supplied to the active material (115) is required.
  • the second scenario (200b) when there are spectral overlaps between light signals at the detection end, further adjustment of electric energy supplied to the special active material is necessary until no spectral overlaps condition achieved.
  • block diagram (300) of the optical waveguide and plurality of sensor module with address (301) and power levels (302) are provided in accordance with an embodiment of the present invention.
  • the address (301) is generated by a coding and decoding module (128).
  • the address (301) of each sensor module (111, 112, 113) is unique and also contains information regarding power levels (302) that feeds to the power module (129).
  • the power levels to special material (115) is adjusted by the signal conditioner (124). Through this addressing mechanism, power light source (107) with different energy levels can be fed to dedicated sensor module as in sensor module (111, 112, 113) and hence providing the ability to vary fluorescence emission wavelength from each sensing module.
  • the sensor modules are chemical sensors.
  • the sensor type uses specific material which responds to chemical parameters (in this case oxygen).
  • chemical parameters in this case oxygen
  • other physical parameter such as temperature are also incorporated subject to the condition that a suitable excitation energy is used for such material to sense temperature.
  • the waveguide (103) is a fibre optic cable.
  • the present invention provides a method for generating a plurality of fluorescence signals with distinct emission wavelengths from a multipoint sensor optical waveguide as depicted by flowchart 400 in FIG. 4.
  • the method comprises the steps of
  • step S403 collecting the specific wavelength emission signals at a fluorescence collecting channel and allowing the emission signals to reach an optical detector, characterized in that the electrical energy applied to the optical filter is adjusted to affect wavelength tunability of each of the specific wavelength emission signals to ensure there is no overlapping of the specific wavelength emission signals.
  • Optical fibre sensing scheme of the present invention multiplexes several sensing points within a single length of optical fibre meaning that several locations can be measured and monitored simultaneously for sensing quantities of interests.
  • the method of the present invention generates fluorescence signals with a unique emission wavelength so that a single detection instrument is able to measure various fluorescence signal emitted from each location on the optical fibre which is arranged in a multi-point sensor manner.

Abstract

L'invention concerne un dispositif capteur de guide d'ondes optiques multipoint et un procédé destiné à générer une pluralité de signaux de fluorescence présentant des longueurs d'onde d'émission distinctes. Le dispositif selon l'invention comprend une pluralité de modules de capteur avec un matériau de fluorescence, chaque module de capteur étant raccordé à un guide d'ondes optiques, à un filtre optique raccordé à chaque module de capteur et configuré pour être traversé par des signaux d'émission de longueur d'onde spécifique ; les signaux d'émission de longueur d'onde spécifique étant distincts les uns des autres et chaque signal d'émission de longueur d'onde spécifique étant généré par application d'un niveau spécifique d'énergie électrique sur le filtre. Le dispositif selon l'invention comprend également un détecteur optique configuré pour recevoir et détecter le signal de fluorescence avec des longueurs d'onde d'émission distinctes, se caractérisant en ce que : l'énergie électrique appliquée sur le filtre optique est régulée pour modifier l'accordabilité de longueur d'onde de chaque signal d'émission de longueur d'onde spécifique, ce qui garantit qu'il n'y a pas de chevauchement des signaux d'émission de longueur d'onde spécifique.
PCT/MY2019/050112 2018-12-19 2019-12-17 Dispositif capteur de guide d'ondes optiques multipoint et procédé de génération de signaux de fluorescence à longueurs d'onde d'émission distinctes WO2020130790A1 (fr)

Applications Claiming Priority (2)

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MYPI2018002804 2018-12-19
MYPI2018002804 2018-12-19

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WO2020130790A1 true WO2020130790A1 (fr) 2020-06-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113514403A (zh) * 2021-04-15 2021-10-19 天津大学 一种基于光纤光栅的宽频弹性波检测系统
WO2022156675A1 (fr) * 2021-01-21 2022-07-28 华为技术有限公司 Récepteur, émetteur et procédé de transmission de signal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071316A2 (fr) * 2000-03-24 2001-09-27 Wisys Technology Foundation, Inc. Groupements unidimensionnels sur des fibres optiques
US8718948B2 (en) * 2011-02-24 2014-05-06 Gen-Probe Incorporated Systems and methods for distinguishing optical signals of different modulation frequencies in an optical signal detector
US9036138B2 (en) * 2010-08-25 2015-05-19 Zte Corporation Method and system for detecting fiber fault in passive optical network
US9645291B1 (en) * 2016-04-18 2017-05-09 Ii-Vi Incorporated Voltage-tunable optical filters for instrumentation applications
US10088410B2 (en) * 2009-01-30 2018-10-02 Claudio Oliveira Egalon Side illuminated multi point multi parameter optical fiber sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071316A2 (fr) * 2000-03-24 2001-09-27 Wisys Technology Foundation, Inc. Groupements unidimensionnels sur des fibres optiques
US10088410B2 (en) * 2009-01-30 2018-10-02 Claudio Oliveira Egalon Side illuminated multi point multi parameter optical fiber sensor
US9036138B2 (en) * 2010-08-25 2015-05-19 Zte Corporation Method and system for detecting fiber fault in passive optical network
US8718948B2 (en) * 2011-02-24 2014-05-06 Gen-Probe Incorporated Systems and methods for distinguishing optical signals of different modulation frequencies in an optical signal detector
US9645291B1 (en) * 2016-04-18 2017-05-09 Ii-Vi Incorporated Voltage-tunable optical filters for instrumentation applications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022156675A1 (fr) * 2021-01-21 2022-07-28 华为技术有限公司 Récepteur, émetteur et procédé de transmission de signal
CN113514403A (zh) * 2021-04-15 2021-10-19 天津大学 一种基于光纤光栅的宽频弹性波检测系统

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