TW585998B - Fiber grating sensor of energy modulation type - Google Patents

Abstract

This invention relates to a new technique of measuring physical quantities such as temperature and force by fiber grating sensors. The technique involves the edge filtering of transmitted light that occurs when a narrow bandwidth light of suitable wavelength from a laser source is passed through a long period fiber grating (LPFG). When the characteristics transmission spectrum of the LPFG is shifting, an energy modulation effect will be achieved when one measures the intensity of the transmitted narrow bandwidth light. The narrow bandwidth strong light is best obtained by the reflection of a wide bandwidth light from a fiber Bragg gratings (FBGs). If the reflected narrow band spectrum from the FBGs is kept constant while the LPFG is subjected to temperature changes, applied loading or other type of suitable physical quantity changes, the characteristic transmission spectrum of the LPFG will shift according to the applied physical quantity, thus modulating the eventual transmitted light intensity. By transforming this intensity into a voltage signal, the variation of the physical quantity concerned can be deduced. Conversely, if the transmission spectrum of the LPFG is kept constant and the FBG is subjected to temperature changes, applied loading or other type of suitable physical quantity changes, the same modulation effect will be achieved and the physical quantity concerned can likewise be monitored.

Description

585998 Amendment 921U / i705. 5. Description of the invention (1) The technical field to which the invention belongs is 11 $ /. A kind of energy modulation mechanism is formed by using a long-period fiber grating filter effect and a narrow-frequency reflection effect of a short-period f Bragg fiber grating. The second series is related to the physical quantity sensor, which can achieve high resolution and high response rate, such as temperature, torsion angle, bending deflection and other physical quantity measurement methods. Especially, there is a f with a Bragg fiber grating (Fiber meter called taboo).

GraUng) Narrowband Reflection and Long Period Fiber Gratings (Long Period Fiber)

Grating), a physical quantity in which waves have high sensitivity to changes in temperature, strain, etc. The tester 'converts the light energy f signal to a voltage signal through a photodiode (ph0t〇di〇de) for computer data Extraction and processing, as the relative physical quantity measurement of the South Resolution South Response Rate. Prior technology: Temperature is very important in basic physical quantity measurement. It can not be used in engineering and academic research. The current temperature sensing technology can be divided into contact and non-contact measurement technology. Yes, no, touch measurement technology mainly uses the method of measuring radiant heat or thermal image to estimate its temperature. Its advantages can be applied to extremely high temperature (greater than 101.c) without affecting the temperature of the object to be measured, but this method The emissivity of the object to be measured must be known in advance, so the measurement object cannot be a material with unknown emissivity. In addition, the main limitation of non-contact temperature measurement technology is that only the surface temperature field can be measured with energy, and its accuracy is very poor. Above UTC, so it is not suitable for low and medium temperature 585998 j 92114472

V. Description of the invention (2) Field measurement. u two; "a certain physical characteristic and temperature exist-one has been refined: mercury; 则:; then the temperature 'common contact sensors are gas, wine; Ren Yin ^ one' 禺: resistance and thermistor, The advantage is that the measuring point to be measured :: J t is still limited by the size of the party temperature measurement probe, and it is difficult to embed it in the inside. The reaction speed of gas, alcohol, and mercury thermometers: ΐ: 范,! The degree of smallness is not high about 0.5 ° c, the voltage signal is not salty, and the temperature is high. The thermal capacity of the temperature 1 measuring probe is large, and the temperature of the object to be measured is easily changed by touch. Often used are electronic thermocouples, resistance and thermistors, of which resistance thermistors also have a high accuracy of 1 、, Ø 丨 rm, ^ $ f with Β 1 ^ compared with the thermocouple thermometer ΐ ΐ it A 'This is a temperature measurement method for extreme f, except that the experimental accuracy is not high and it is not easy to measure the internal temperature field in the test object. And because thermocouples use two different metals due to temperature, Different thermal dynamics (Seebeck effect) to measure temperature, due to the measured bismuth head and The wires are two different metal materials, which are susceptible to environmental corrosion (Envlronment Corrosion) and electrochemical corrosion ((ϊ3ΐν & η ^ Corrosion). The stability of the instrument is a concern, and it is easily affected by electromagnetic noise. It is not suitable. It is used in environments with free radiation, so it is not suitable for use in harsh environments. In addition, the measurement range of thermocouple temperature coupling is large but the resolution is poor (about 0 · 5 ° C), so thermocouple is not suitable for micro temperature Field sensing 'therefore the problems of the stability and resolution of thermocouples need to be overcome. ^^ 5998 _ Case No. 92114472 5th, Invention Day 77 ^-For the measurement of torsion and bending force, Xi 4 = Formula Strain gauges, capacitors, and inductors. These methods include the use of electric shouts, which is quite convenient and easy to measure. However, the accuracy of measurement is as follows: the voltage signal and electromagnetic noise are the effects. The sensing elements are two and two. : It is susceptible to environmental magnetism to measure the amount of internal deformation. It is embedded in the inside of the object to be measured; the method of deformation, such as photoelasticity; and optics; , Not easy to automate 乂 ' Need to repeat the measurement of practical engineering is not practical. Xiao Automation's implementation is difficult, so during the filtering period, the optical fiber radiation profile can also be the former in the wavelength or spectrum of the device temperature sensor. The role in the manufacture of gratings In order to make use of these changes in the appropriate peripheral temperature and the average temperature change in the transmission spectrum, the long-period fiber gratings attenuate specific wavelengths and can be used as filters in communication. The grating reticle is made by changing the fiber diameter periodically with the periodic change of the refractive index inside the fiber caused by the ultraviolet light. The change of the fiber diameter is achieved by the lateral and torsional force τ. The transmission frequency changes under lateral and torsional force. Through appropriate change characteristics, a long-period fiber grating can be used as a sensor for other related physical quantities after lateral and torsional force. Bragg fiber gratings have a choice of specific wavelengths; and Temperature change, axial, lateral and torsional force τ, this change characteristic, ί 'use appropriate device to make use of this, shaft And twisting the knob u Charm period fiber Bragg grating as the temperature becomes Soil - sensing a physical quantity related to the force. Page 10 V. Description of the invention (4) At present, regardless of the long period or the wavelength of the fiber Bragg grating, complex instruments are required, such as the visible light spectrum.

In addition to Fabry-perot fiber optic interferometers that perform wavelength drift, in addition to being expensive, the demodulation speed is also affected by 5 weeks. The physical quantities of such instruments are measured. degree? Based on the above discussion, the purpose of the present invention is to provide a paleo-rate and low-cost sensor that can be used for micro-analysis, analysis of two reactions or song force, or other factors that can affect long periods. The amount of the physical quantity of the reflection spectrum of the cycle fiber Bragg grating ^ minus the wavelength or short type is suitable for harsh environments, such as (about 1 2 5 // m diameter, far smaller sensing element) and can be buried as a smart material structure. Another object is to provide a small-sized sensing element that is applied to the interior of the material at the existing temperature, torsion, or bending force by applying a south magnetic field, high electromagnetic noise, and free radiation. The purpose of the present invention is to provide a device capable of ^ ^ ^ ^ including:-a long-period optical fiber grating, the above-mentioned long-period optical sensor, a shield, a degree or other physical quantity sensor;-a broadband source, a Bragg fiber grating, Form a narrow bottle with a specific wavelength; 5 shots. A 4-person Bragg fiber grating is used for long-frequency reflection. A coupler can guide the above-mentioned broadband light source. 585998 Amendment No. 92114472 5. Description of the invention (5) Into the above-mentioned Bragg fiber grating And derive a specific wavelength narrow-frequency reflection formed; take f, a light wave energy measuring component, the light wave energy measuring component is used to measure the light wave energy reflected from the Bragg fiber grating and passing through the long fiber grating. / This sensor is a grid-shaped optical fiber and is used to shoot a wide grid system for radiation; one side grid and the derivative measurement group have a periodic fiber volume of 0 and the composition grid system is made to reflect the frequency light source modulation. The shape of the component, the upper grating anti-objective component package as the force of the desired amount: a long description of the Brass can be the above-mentioned special light wave and pass to provide a package: a quantity, temperature or the physical period of the fiber The optical grid fiber grating describes the wideband light source with a fixed wavelength and a narrow frequency energy measurement group through the specific grating of other physical quantities of the above-mentioned Brass energy modulation lattice fiber grating, and the specific length formed is introduced into the cloth reflection; and the components are used to measure袼 Optical fiber grating type fiber grating, the above-mentioned Brass sensor, long and narrow frequency anti-periodic fiber light wavelength and narrow frequency anti-rag fiber light, a light wave energy measurement from the above long light wave energy A burst = another purpose is to Provide an energy-modulated fiber grating ^ I fiber optics: the components include:-long-period fiber gratings, the above long cycle 3 is used as a sensor of force *, temperature or other physical quantities; wave 2 Measuring light source: f light source; &, a light wave energy measurement component, the above light beams: up, f :, and pieces are used to measure the reflection from the fixed-wavelength narrow-frequency light source and describe the long period fiber grating modulation Light wave energy. Reduced effect, short cycle Zhou ^^ Fiber grating has a paste for specific turbidity county Page 12 585998 Case No. 92114472

V. Description of the invention (6) Period Bragg fiber gratings have a selective narrow-band reflection effect on specific wavelengths. If a broadband light source is reflected by a Bragg fiber grating and then passes through a long-period fiber grating, then the spectrum passed by the fiber will be apparent. The relative position of the periodic fiber grating's chirped wavelength and the Bragg fiber grating's reflected wavelength varies from zero to a maximum. If the inverse fiber Bragg grating of Bragg fiber grating is used to sense the change in temperature or physical quantity, it will make the light wave penetrate the frequency spectrum. The narrow frequency laser reflected by this fiber grating will pass through the narrow frequency laser of the optical path. The brightness of the light source is changed to energy, which can be used to estimate the temperature or force conversion mechanism (Transducer me chan is converted to deformation or temperature, and applied to sense various forms of physical quantities. The physical attenuation of the wavelength such as the radiation wavelength retention force changes through the light source. , By physical quantity ism), will remain unchanged for a long period, and the measurement of the quantity will undergo corresponding trans-spectral spectrum modulation, which can be measured. In addition, if you want to measure a fiber grating and a long-period component, the drift, The use of one physical quantity passed from Prague after the last pass can be reflected by the wavelength force, etc., and the mechanism quantity can also be transmitted through an unreasonable amount of wave penetration for the purpose of estimating the security wave. If the attenuation of the long-period fiber grating is changed, and the Bragg fiber grating is used as a temperature sensing or sensing element, then The change of the sensed physical quantity, its corresponding drift, and then the attenuation energy of the long-period fiber grating reaches the modulation, and the physical quantity such as temperature or force is measured by measuring the energy that finally passed. In addition, if a transducer (transducer mechanism) is used to apply the shape or temperature of the object to be measured to the Bragg fiber grating, then

Page 13 585998 No. 1 921U479 V. Description of the invention (7) Various types of physical quantities Month Modification Using this Bragg fiber Over-energy method Tracking the lock length By measuring the short cycle By grasping the negative reflection of the attenuation wavelength period Bragg light quantity. In addition, the mechanism) is also applied to the special type of energy modulation grating with a volume of 0, so that the short period fiber period Bragg feedback mechanism can be used, such as the latter fiber grating, which can be used to draw the desired fiber mechanism, the wavelength, and the period. The Bragg grating's special fiber grating control parameters are used for physical specific reflection. An energy-changing object grating can be added. With the appropriate negative feedback mechanism to control, we can determine the attenuation of the specific reflection wavelength of the highest fiber grating by locking it. Wavelength, in this way, by borrowing a specific reflection wavelength, or even borrowing, you can grasp the sensing element of the long-period fiber grating quantity, and then measure the short-period wavelength to grasp the relevant physical mechanism. Or temperature, it can be used to sense various forms of physical implementation methods. Modification of fiber-optic fiber grating inverse spectrum generation energy. · Bend, increase the grating sensor by the physical quantity such as short cloth to the photoelectric two. Variable action, by twisting and applying physical pulls such as the narrow fiber body to which the fiber grating is disturbed and changed, it will decrease with the desire to achieve Using a Wide Fiber Optic Periodic Light to Perturbate or Axis RF Measurements Page 14 585998

The photoelectric energy is used to sense the change of the physical quantity in a manner of measuring the light energy. Figure: This is a schematic diagram of the principle of the energy modulation fiber grating sensor achieved energy modulation of the present invention. The present invention can be basically divided into four parts: a broadband light source 1'new period fiber Bragg grating 4, long period fiber grating 5 and light energy voltage signal converter 6. The broadband light source 丨 reflected by the short-period Bragg fiber grating 4 becomes a narrow-frequency intense light source, and is introduced into the long-period optical fiber through the coupler 3 to form an energy modulation effect as shown in FIG. 1. The passing light 旎 1 is converted into a current signal by the photodiode 6. This current Λ can provide a voltage signal that can be easily and accurately measured through an appropriate conversion and amplification circuit, and this voltage signal is proportional to the light energy passing through. In addition, the present invention can be added with a transcjucer mechanism and applied to a fiber grating as a sensor to increase its sensing sensitivity or convert a physical quantity that cannot be measured by the original fiber grating 4 into a deformation amount or temperature. After the measurement, the energy modulation fiber grating induction invention described above is used for measurement. FIG. 1 is an embodiment of the present invention. This embodiment is applicable to a temperature measurement.凊 Referring to FIG. 2, a laser diode 8 with a wavelength of 9 800 nm first emits laser light, and then enters an erbium-doped fiber amplifier (EDFA) 10 through a wavelength multiplexer 9 to generate spontaneous emission fluorescent light ( ASE: Amplifie (i Spontaneous Emission). Then the narrow-band light reflected by the Bragg grating 4 is reflected by the narrow-band light. The narrow-band light reflected by the coupler 3 is then hit to the erbium-doped fiber and the mirror 11 to form a resonant cavity, thereby exciting the laser effect ( lasing) produces a narrow-band high-intensity light source with a specific wavelength (1 542 nm).

585998 Correction θ ^ No. 92ΐι ~ 7〇 5. Description of the invention (9) Yuan 2 = week? The fiber grating 5 is a single temperature-sensing characteristic of this embodiment. The long-period fiber grating 2UC with an edge filter will drift through the spectrum due to temperature disturbances, and will be filtered by the poor wave #space. Therefore, the narrow-band light of a fixed wavelength of the present invention ΐ: Ξίί: ί The light energy will change with temperature changes *, the long-period fiber optic grating 5 according to the present invention penetrates through the spectrum data to show a 0.5nm shift. Figure 4 shows the measurement results of the drift A ″ Γ — ^ ^ m at the day of good tuning f. The main purpose of the photodiode 6 in the spectrum diagram 1 caused by temperature disturbance of the grid is to reflect the narrow wavelength light source (1 542nm) of the specific wavelength of the present invention so that it penetrates the long-period fiber grating 5. The periodic fiber grating 5 has different effects on the light energy due to the temperature change. The transmitted light energy is converted into an electrical signal through the photodiode 6. Different temperature will or should have different measured voltage values. The reference data is shown in Figure 5. It is a long-period fiber grating temperature. The diode 6 receives an energy map. Its measurement temperature resolution is 0 · 〇 1 ° c, and because the sensor has a small volume, it can be embedded in the object to be measured, and the volume is very small, so the thermal capacity is very low, which will not affect the temperature of the object. The present invention can easily achieve accurate temperature sensing by combining long and short period fiber gratings, and has deep accuracy and weather resistance, so it can be used as a high precision temperature sensor. In addition, the present invention can also utilize a Transducer mechanism 7, as shown in FIG. 3, to convert a physical quantity to be measured into a deformation amount or a temperature, and apply it to a long-period light 5 wearing a grating 5. It is used to increase its sensing sensitivity or to convert physical quantities that could not be measured by the long-period fiber grating 5 into deformation or temperature measurements. Page 585998

The high temperature of this hair is shown in Figure 3. The long-period or torsional variable-force long-period transmission spectrum should be converted by external force-type torsion, etc. The above-mentioned degree-sensitive methods are explained. Although the example of the amount of cyclic force uses the long-period fiber grating as a temperature sensing element, Figure 2 is not limited to the measurement of temperature. If the temperature is constant, the grid 5 feels externally applied. The power such as the axial direction and the bending of its physical quantities, especially the use of periodic etching to manufacture external gratings, can apply a force to a specific mode to generate similar familiarity. Those skilled in the relevant fields can understand that in the use of suitable ransducers) with long-period fiber gratings5 The optical fiber grating can also be used for stretching, bending, and measuring. In addition, the measuring device described in Figs. 2 and 3 includes laser diode 8, erbium-doped fiber amplifier (EDFA) 10, and Bragg fiber. The narrow-band laser-intensity light source composed of the grating 4 can also be replaced by other narrow-band laser-intensity light sources with suitable wavelengths without affecting the implementation of the spirit of the present invention. ', ... FIG. 6 is another embodiment of the present invention. In view of the high stability and stability requirements of the laser light source in the embodiment of FIG. 2, in order to allow the use of a laser light source whose brightness changes with time, Before passing the long-period fiber grating 5 sensor, use the coupler 3 to divide part of the energy of the unmodulated narrow-frequency light source, and perform a normalization process of proportionally calculating the energy after the long-period fiber grating 5 modulation. iza ti〇n), and use two photodiodes 6 and divider 12 to normalize the light energy, so that the measurement results are not affected by the brightness change of the laser light source

IH

IH 585998 ___ Case No. 92114472 __Year Month Day_Amendment ___ V. Description of the invention (11) Figure 7 is another embodiment of the energy-modulated fiber Bragg grating sensor of the present invention, 'Transducermechanism' 7 The physical quantity to be measured is converted into the deformation amount or temperature and applied to the Bragg fiber grating 5 'and the light energy is normalized by using two photodiodes 6 and a divider 1 2 to make the measurement result unaffected. Influence of laser light source brightness changes. FIG. 8 shows another embodiment of the present invention, the basic components of which are the same as the above example, including a laser diode with a wavelength of 98 nm, a bait-doped fiber amplifier (EDFA) 10, and a Bragg fiber grating 4. A narrow-frequency laser intense light source, a long-period fiber grating 5 and a light wave energy measurement component composed of a photodiode 6 and an amplification and conversion circuit. Different from the above example, the sensing element is a short-period Bragg fiber grating 4. This embodiment uses the Bragg fiber grating 4's high sensitivity to temperature, deformation, or other physical quantities as a sensing element for temperature, deformation, or other physical quantities. . FIG. 9 is a schematic diagram of another embodiment of the energy-modulated fiber Bragg grating sensor according to the present invention. 'This example uses a transducer mechanism 7 to convert a desired measured temperature into a deformation amount, and applies it to a Bragg fiber grating 4 On top as a temperature sensor. FIG. 10 is another embodiment of the present invention. In view of the embodiment of FIG.

Page 18 585998 _ Case No. 92114472 Birth Month Day Repair V. Description of Invention (12)

The long modulation is affected by one's relative position, and the relative position can only allow limited changes, so that the range of physical quantities that can be reflected by the long-period fiber grating 5 is limited. In order to break through this limitation, piezoelectric is used in this embodiment. The ability of material deformation 'through appropriate feedback circuits, such as piezoelectric actuators 13, to follow the reflected wavelength of the Bragg fiber grating 4 to lock the highest pass energy ΐ' in this way, the specific attenuation wavelength of the long-period fiber grating 5 Synchronized with the specific reflection wavelength of the short-period Bragg fiber grating 4. By measuring the specific reflection wavelength of the short-period Bragg fiber grating 4, the long-period light can be grasped. The attenuation wavelength of the grating 5 is used as a physical quantity sensing element. Then the physical quantity of the specific reflection of the short-period Bragg fiber grating 4 is measured. κ | "Hand-to-hand coherence :: one invention of an energy-modulated fiber Bragg grating sensor-an embodiment ^ ^ 1 * ^. J ^ (Transducer mechanism) 7 Bragg fiber light: f electric actuator 13 negative The feedback control mechanism adjusts and controls the wavelength reduction book 4 'to track and lock the characteristic decay of the long-period fiber grating 5. The example illustrates the temperature. This is a technical expert in the field of the present invention. g "to achieve the completion of the work

Page 19 Sensing, however, the use of the Γ column for temperature sensitivity per W fiber grating is not intended to limit the spirit of the present invention. In high-precision fiber gratings with high temperature or additional force sensitivity, it is widely used: the spirit and scope of force sensing-all should be included in the following patent application 585998

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585998 Case No. 92114472 Modified diagram Brief description of the purpose, features, advantages and preferred embodiments of the present invention will be described in more detail in the following description with the following figures: Figure 1 is the use of long-period optical fiber The grating filter effect and the narrow-frequency reflection effect of the short-period Bragg fiber grating form an energy modulation mechanism. Fig. 2 is a schematic diagram of an embodiment of an energy modulation fiber grating sensor according to the present invention. Fig. 3 is a schematic diagram of an embodiment of an energy-modulated fiber grating sensor of the present invention and a transducer mechanism applied to a long-period optical grating. Figure 4 shows the spectral drift caused by temperature disturbance of the long-period fiber grating temperature. Figure 5 shows the energy received by the photodiode with temperature disturbance of the long-period fiber grating.

FIG. 6 shows another 2 ′ of the energy-modulated fiber Bragg grating sensor of the present invention, which uses two photodiodes and a divider to suspend the light energy, so that the result is not affected by the change in the brightness of the laser light source.

585998 --92Π4472 a 倏 正 _ Brief description of the drawing Figure 7 is another embodiment of the energy-modulated fiber Bragg grating sensor of the present invention 'normalizing light energy using two photodiodes and a divider' enables The measurement result is not affected by the brightness change of the laser light source, and a transciucer mechanism is applied to the Bragg fiber grating. FIG. 8 is a schematic diagram of another embodiment of the energy-modulated fiber Bragg grating sensor of the present invention. In this example, a fiber Bragg grating is used as a temperature sensor. Fig. 9 is a schematic diagram of another embodiment of the energy-modulation-type fiber grating sensor according to the present invention. In this example, a transducer mechanism is applied to the fiber Bragg grating as a temperature sensor. FIG. 10 is a schematic diagram of another embodiment of the energy-modulated fiber Bragg grating sensor of the present invention. In this example, a piezoelectric actuator negative feedback control mechanism is used to adjust and control the Bragg fiber grating to track and lock the long-period fiber grating. Minus the wavelength. Grating

Schematic illustration of the embodiment 'This example uses a transducer mechanism (Transduc ^ r figure Η is the energy modulation mechanism of the present invention) to convert the physical quantity to be measured into a deformation amount or a warm production, and apply it to a long-period grating, and use the house The negative feedback control of the electric actuator ^ and the Bragg fiber grating is adjusted to lock the long-period fiber sign attenuation wavelength.

585998 Case No. 92114472 Revised diagrams Brief description of diagrams Symbol comparison table Broadband light source 1 Waveguide tube 1 Fiber 2 Coupler 3 Short-period fiber Bragg grating 4 Long-period fiber Bragg grating 5 Photodiode (InGaAs Photodiode) Transducer Transducer mechanism Laser Diode 8 Wavelength Multiplexer WDM 9 EDFA 10 Reflector 11 Divider 1 2 Piezoelectric Actuator 1 3

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Claims (1)

585998 ± ^ Day j positive energy modulation fiber grating sensor, its group number 921U47? 6. Patent application scope _ ^ into a component package; te force a long-period fiber grating, the long-period fiber grating system, Sensors for physical quantities such as temperature; scriptures as a broadband light source;: Bragg fiber gratings, narrow-band reflections of the Bragg fiber at a fixed wavelength; τ uses features to form features and a coupler, which can be used to introduce the broadband light source into the Bradley Fiber Bragg Gratings; The energy measurement components of the chirped light wave and the energy measurement components of the chirped light wave are used to measure two places = the light reflected by the Bragg fiber grating and passing through the long-period fiber grating. Grating sensor 'wherein the long-period fiber grating can be an external force type long-period fiber grating 0 3 · If = please apply for the energy-modulated fiber grating sensor of the first item of patent scope', where the light wave energy measurement component is a photodiode The body can convert the modulated penetrating light energy into a voltage signal that reflects the change of the physical quantity. 4 · If the energy-modulated fiber Bragg grating sensor in item 1 of the patent application scope further includes a transducer mechanism, the transduction mechanism is used to convert the physical quantity to be measured into deformation or temperature. Page 24 585998 __plug No. 92114472 car month day correction __ Sixth, the scope of patent application 'is applied to the long-period fiber grating. 5 · If the energy-modulated fiber Bragg grating sensor 'item of the scope of patent application 1' further includes a wavelength multiplexer to introduce the laser wave generated by the laser diode into the erbium-doped fiber to make it spontaneous A broadband light source that emits fluorescence (ASE 'Amplified Spontaneous Emission). 6. The energy-modulated fiber Bragg grating sensor according to item 1 of the patent application scope further includes an erbium-doped fiber amplifier (EDFA). 7 · If the energy-modulated fiber Bragg grating sensor of item 1 of the patent application scope 'is used, the narrow-band reflection of the specific wavelength can be lasered. · The laser diode emits a laser light with a wavelength of 9 8 nm. Through the wavelength multiplexer, it is injected into the bait-doped fiber to generate spontaneous emission fluorescent light (ASE) broadband light, and then the Bragg grating is used to reflect specific narrow-band light, and the reflected narrow-band light also passes through the coupler. Then hit the erbium-doped fiber and the reflector to form a resonance cavity, and then trigger the laser effect. 8 · Energy-modulated fiber gratings as in item 1 of the patent application Inductor, in which the light energy that has not been modulated by the long-period fiber grating is used by the coupler to divide out a portion of the energy of the narrow-frequency light source, and the normalization processing for the ratio calculation of the energy after the modulation is performed. ), So that the measurement result is not affected by the brightness change of the laser light source. Page 25 585998 H Tiger 92114472 Sixth, the scope of the patent application is modified ^ modulated fiber Bragg grating sensor, its constituent elements include: lattice fiber grating, the Bragg fiber grating is used as a force-specific physical quantity sensor, and used to form A narrow-wavelength reflection of a specific wavelength reflecting the physical quantity to be measured; a broadband light source; a phase 2 fiber grating, the long-period fiber grating is used to modulate a narrow-wavelength reflection of a specific wavelength formed by the fiber-optic grating; a coupler, which can The broadband light source is introduced into the Bragg fiber grating; the wave-in-line measurement module is used for measuring the light reflected by the long-period fiber grating and passing through the Bragg fiber thumb; The wave energy U, such as the energy-modulated fiber Bragg grating sensor of item 9 of the patent scope, wherein the light wave energy measurement component is a photodiode ', which will be tuned with a read-through umbrella. Voltage signal. Penetration is converted into a reaction physical quantity change 12. For example, the energy-modulated fiber grating of item 9 of the patent application page 26 585998 The transducer further includes a transducer mechanism (transducer mechani sm), which is used to convert a physical quantity to be measured into a deformation amount or a temperature, and is applied to the Bragg fiber grating. 1 3 · If ^ please request the energy-modulated fiber optic light bulb induced state of item 9 of the patent, '> further includes a wavelength multiplexer for introducing the laser wave generated by the laser diode into the doped fiber To make it a broadband light source with spontaneous emission fluorescence (ASE Amplified Spontaneous Emission). 1 4 · If. The energy-modulated fiber Bragg grating sensor 'of item 9 of the patent application scope further includes an erbium-doped fiber amplifier (EDFA). 15 · For example, the energy-modulated fiber Bragg grating sensor of item 9 of the patent application scope, 'wherein the laser diode of the narrow-wavelength laser light source of the specific wavelength emits two laser lights with a wavelength of 980 nm, and passes through the wavelength multiplexer Into the erbium-doped fiber to generate spontaneous emission fluorescent (ASE) broadband light, and then reflect the specific narrow-band light through the = Bragg grating, and the reflected narrow-band light hits the erbium-doped fiber and the mirror through the coupling. A resonant cavity is formed, which in turn causes a laser effect. The energy-modulated fiber Bragg grating sensor 'in the scope of the patent application No. 9', wherein the light energy that has not been modulated by the long-period fiber grating is used by the coupler to divide part of the energy of the narrow-frequency light source, Normalization of subsequent energy ratio calculation 585998 $ 92114472 6. Apply for patentization (normalization), so that the measurement results are not affected by laser actinization. I 17. A kind of energy-modulated fiber grating sensor, its constituent elements include: · Denier: ΐ period light, light 'The long-period fiber grating is used as a force sensor, temperature 4 physical quantity sensor; must be Narrow-wavelength light source and measuring instrument: f :: two f components' f Hai light wave energy measurement component is used to measure: ancient lb: ~ ^ The light wave energy reflected by the light source and passing through the long period fiber grating is set. Day correction: Second, the energy-modulated fiber optic polar body of item 17 in the range of Λ, which can transmit the voltage signal after the modulation to the electricity. The penetration of this 1 is converted into a reaction physical quantity change. The energy-modulated fiber-optic grating sensor of the 17th in the scope of patent application for 2W, more specifically, a fixed-wavelength narrow-frequency laser? Source: Lei ~ Huaru Energy-modulated Fiber Optic Optoelectronics, No. 17 in the scope of patent application, page 28 I 585998 __ Case No. 92114472_ ± —_ ^ Chromium 26. Patent scope grating sensor, including certain The narrow-wavelength laser light source can be generated by the laser effect (1 as i ng). The laser diode emits a laser light with a wavelength of 9800 nm, and is radiated into an erbium-doped fiber through the wavelength multiplexer to generate Spontaneous emission of fluorescent (ASE) broad-band light, and then reflecting the special X fixed narrow-band light through the Bragg grating. The reflected narrow-band light hits the doped fiber and the reflector to form a resonant cavity through the combiner, thereby triggering the laser. Effect, which produces the narrow-wavelength laser light source of the desired wavelength. 2 2 · If the energy-modulated fiber Bragg grating sensor in item 17 of the patent application scope includes a Bragg fiber grating, the Bragg fiber grating is used to form a narrow wavelength reflection at a specific wavelength, and the reflected narrow frequency light also passes through the coupling The device hits the erbium-doped fiber and the reflector to form a resonant cavity, which in turn triggers the laser effect (1 asing) and generates the narrow-wavelength laser light source of the desired wavelength. 2 3. If the energy-modulated fiber Bragg grating sensor in item 17 of the scope of patent application, further includes a transducer mechanism, the transduction mechanism is used to convert the physical quantity to be measured into a deformation amount or a temperature 'And applied to the long-period fiber grating. 2 4 · If the energy-modulated fiber Bragg grating sensor of item 17 of the scope of the patent application 'wherein the light energy that has not been modulated by the long-period fiber grating is used by the coupler to divide out a portion of the energy of the narrow-frequency light source, The normalized processing of the ratio calculation of the energy after the modulation of the long-period fiber grating, so that the measurement results are not affected by the brightness of the laser light source Page 29 585998 Case No. 92114472 Revised Page 30