CN-122015956-A - Temperature and sound pressure double-parameter measuring device and measuring method based on fluorescence sensing

CN122015956ACN 122015956 ACN122015956 ACN 122015956ACN-122015956-A

Abstract

The invention discloses a temperature and sound pressure double-parameter measuring device and a measuring method based on fluorescence sensing, wherein the temperature and sound pressure double-parameter measuring device based on fluorescence sensing comprises a light source driving module, a light source driving module and a light source driving module, wherein the light source driving module is used for outputting pulse light to excite fluorescent materials to emit light; the fluorescent light sensor comprises a fiber fluorescent sensor for detecting temperature and sound pressure changes, a fluorescent signal detection circuit for converting fluorescent signals into electric signals by a photoelectric conversion circuit after receiving the fluorescent signals transmitted by the fiber fluorescent sensor and obtaining signals after filtering and amplifying the signals by processing, and a signal demodulation processing circuit for obtaining fluorescent service life by processing the fluorescent signals output by the fluorescent detection circuit. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing provided by the invention designs the optical fiber fluorescence sensor with simple structure and high sensitivity, and realizes measurement of temperature and sound pressure double parameters.

Inventors

YANG XINYUE
SUN AN
DING KEQIN

Assignees

西北大学

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (10)

1. Temperature and acoustic pressure double parameter measuring device based on fluorescence sensing, characterized by comprising: the excitation light output module is used for outputting an excitation light signal for exciting the fluorescent material to generate a fluorescent signal; The optical fiber fluorescence sensing probe generates a fluorescence signal under the excitation of the excitation light signal output by the light pulse output module; The sound pressure measuring device is used for measuring fluorescent signals generated by the optical fiber fluorescent sensing probe under different sound pressures when the temperature is constant; the temperature measuring device is used for measuring fluorescent signals generated by the optical fiber fluorescent sensing probe at different temperatures when the sound pressure level is constant; the optical filter is used for filtering the excitation light signals mixed into the fluorescent signals and stray light of a system light path; the signal detection module receives the fluorescent signal transmitted by the optical filter and converts the fluorescent signal into an electric signal; the signal processing module is used for obtaining the fluorescence life under different temperatures and different sound pressures according to the electric signals converted by the signal detection module, and obtaining the temperature and sound pressure to be monitored according to the fluorescence life under different temperatures and different sound pressures.
2. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing according to claim 1, wherein the method for obtaining fluorescence lifetime at different temperatures and different sound pressures by the signal processing module is as follows: performing discrete Fourier transform on the acquired fluorescent signals to obtain 1-time item : Wherein, the Is the initial fluorescence intensity; a data sampling time interval; J is an imaginary number unit, and N is the total sampling point number; according to item 1 Obtaining the phase angle tangent value : Wherein, the Representing 1 st order item Is used to determine the imaginary part of (c), Representing 1 st order item The real part of (2); According to the phase angle tangent Fluorescence lifetime was calculated: According to the fluorescence signals generated by the optical fiber fluorescence sensing probe at different temperatures and measured by the temperature measuring device, combining the calculated fluorescence life, and fitting the fluorescence life And temperature Linear relation of (2) and fluorescence peak intensity And temperature According to the fluorescence lifetime And temperature Obtaining temperature sensitivity of fluorescence lifetime according to the linear relation of fluorescence peak intensity And temperature Obtaining the temperature sensitivity of fluorescence peak intensity; According to the fluorescent signals generated by the optical fiber fluorescent sensing probe measured by the sound pressure measuring device under different sound pressures, the calculated fluorescent life is combined to fit the fluorescent life And sound pressure Linear relation of (2) and fluorescence peak intensity And sound pressure According to the fluorescence lifetime And sound pressure To obtain the sound pressure sensitivity of fluorescence lifetime according to the fluorescence peak intensity And sound pressure The linear relationship of (2) yields the sound pressure sensitivity of the fluorescence peak intensity.
3. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing according to claim 2, wherein the signal processing module obtains the temperature and sound pressure to be measured according to fluorescence life at different temperatures and different sound pressures by: calculating the temperature variation and the sound pressure variation: In the formula, In order to be the amount of change in temperature, Is the sound pressure variation; As a life change value of fluorescence life with temperature and sound pressure, The fluorescence peak intensity variation value is the fluorescence peak intensity variation with temperature and sound pressure, For the temperature sensitivity of the fluorescence lifetime, Temperature sensitivity as fluorescence peak intensity; for the sound pressure sensitivity of the fluorescence lifetime, Sound pressure sensitivity, which is the fluorescence peak intensity; And according to the calculated temperature variation and sound pressure variation, combining the initial temperature and the initial sound pressure value to obtain the temperature and the sound pressure received by the sensor during detection.
4. The fluorescence-sensing-based temperature and sound pressure double-parameter measurement device according to claim 1, wherein the excitation light output module comprises a signal generator, a voltage-current integration module and a laser diode, wherein the signal generator generates an electric pulse signal with a predetermined frequency and pulse width, the voltage-current integration module converts a voltage signal generated by the signal generator into a current signal, and the laser diode outputs the excitation light signal under the excitation of the current signal.
5. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing according to claim 1, wherein the sound pressure measuring device consists of an acoustic transmitter and a sound pressure meter, and the temperature measuring device is heated by a digital display constant temperature heating table.
6. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing according to claim 1, wherein the signal detection module comprises a photoelectric detector and an oscilloscope, the photoelectric detector receives a fluorescence signal transmitted by the optical filter, and the photoelectric conversion circuit converts the fluorescence signal into an electric signal to obtain a fluorescence digital signal and outputs the fluorescence digital signal, and the complete waveform of the fluorescence signal is received by the oscilloscope.
7. The fluorescence sensing-based temperature and sound pressure dual-parameter measurement device of claim 1, wherein the fiber-optic fluorescence sensing probe comprises: A fluorescent material; UV optical curing glue; Hollow photon crystal optical fiber; And And the multimode optical fibers are welded at two ends of the hollow photonic crystal fiber.
8. The temperature and sound pressure double-parameter measuring device based on fluorescence sensing according to claim 7, wherein the optical fiber fluorescence sensing probe utilizes an MMF-MMF cladding alignment mode of a common fusion splicer to splice multimode fibers at two ends of a hollow photonic crystal fiber, then the fluorescent material is uniformly coated at the hollow photonic crystal fiber cladding from which a coating layer is stripped after being mixed with optical cement, and then the hollow photonic crystal fiber is solidified by a UV lamp.
9. The fluorescence sensing-based temperature and sound pressure dual-parameter measurement device of claim 8, wherein the multimode fiber core diameter is 62.5um and the cladding diameter is 125um; The fluorescent material is rare earth fluoride powder ZnOF, yb 3+ ,Er 3+ , wherein ZnOF is taken as a matrix material and provides a stable lattice environment for rare earth ions, yb 3+ is taken as a sensitizer, energy of 980nm excitation light is absorbed and transferred to Er 3+ ;Er 3+ as an activator, and photons are emitted to realize luminescence; the hollow photonic crystal fiber is a photonic band gap type photonic crystal fiber, the fiber core is an air hole with the diameter of 16um, the cladding diameter is 125um, and the hollow photonic crystal fiber consists of 6 layers of air holes with the diameter of 6.35 um; The UV optical curing adhesive is transparent and colorless NOA61 optical adhesive, can be cured by 365nm ultraviolet irradiation, has good light transmittance and elasticity, and can resist temperature of-150 ℃ to 125 ℃.
10. A temperature and sound pressure double parameter measurement method based on the fluorescence sensing-based temperature and sound pressure double parameter measurement device according to any one of claims 1 to 9, comprising: When the temperature measurement is carried out, the optical fiber fluorescence sensing probe is placed on a digital display constant temperature heating table, and on the premise of keeping the sound pressure relatively stable, fluorescent signals at different temperatures are detected by controlling temperature indication of the digital display constant temperature heating table, and the corresponding fluorescence service life is obtained through data processing; When the sound pressure measurement is carried out, the optical fiber fluorescence sensing probe is placed on a digital display constant temperature heating table, the sound pressure of the sound frequency transmitter is changed by controlling the frequency of the sound frequency transmitter to be certain under the premise of keeping the temperature relatively stable, the output sound pressure level can be calibrated through a sound pressure meter, the corresponding sound pressure is calculated according to a sound pressure level formula, and then the corresponding fluorescence life is obtained through data processing; and eliminating the cross sensitivity generated by the temperature and the sound pressure by using a sensitivity matrix to obtain the temperature and the sound pressure.

Description

Temperature and sound pressure double-parameter measuring device and measuring method based on fluorescence sensing Technical Field The invention belongs to the technical field of optical fiber sensing, and particularly relates to a temperature and sound pressure double-parameter measuring device and method based on fluorescence sensing. Background The optical fiber sensor is widely applied to the detection of physical quantities such as temperature, pressure, sound wave and the like due to the advantages of electromagnetic interference resistance, small volume, high sensitivity and the like. However, most fiber optic sensors in the prior art measure only a single physical quantity, such as a temperature sensor based on bragg gratings or raman scattering, or a pressure sensor based on fiber optic interferometers. Such single parameter sensors are susceptible to other physical quantities in complex environments, resulting in measurement errors. For example, temperature variations may cause substrate drift of the acoustic pressure sensor, while acoustic pressure fluctuations may also affect temperature readings through mechanical deformation of the fiber, creating cross-sensitivity problems. In order to solve the problem of multi-parameter synchronous measurement, partial researches are attempted to combine various sensing mechanisms, such as a multi-core optical fiber or a composite grating structure, but the defects of complex system, difficult demodulation, high cost and the like exist. In addition, although the fluorescence sensing technology can reflect environmental changes through fluorescence lifetime or intensity, the response of a single fluorescence parameter (such as lifetime) to multiple physical quantities has coupling, and the independent effects of temperature and sound pressure are difficult to distinguish. For example, existing fluorescence sensors typically only utilize the temperature dependence of fluorescence lifetime, ignoring the effect of sound pressure on fluorescence properties, or do not build an efficient decoupling model, resulting in limited accuracy of dual-parameter measurements. Disclosure of Invention The invention aims to solve the technical problem of providing the temperature and sound pressure double-parameter measuring device and the measuring method based on fluorescence sensing, which have simple structures and high sensitivity, can realize the measurement of temperature and sound pressure double parameters, analyze the fluorescence intensity and fluorescence service life change caused by sound pressure, and solve the problem of cross sensitivity of temperature and sound pressure. In order to achieve the above purpose, the invention adopts the following technical scheme: temperature and acoustic pressure double parameter measuring device based on fluorescence sensing, characterized by comprising: the excitation light output module is used for outputting an excitation light signal for exciting the fluorescent material to generate a fluorescent signal; The optical fiber fluorescence sensing probe generates a fluorescence signal under the excitation of the excitation light signal output by the light pulse output module; The sound pressure measuring device is used for measuring fluorescent signals generated by the optical fiber fluorescent sensing probe under different sound pressures when the temperature is constant; the temperature measuring device is used for measuring fluorescent signals generated by the optical fiber fluorescent sensing probe at different temperatures when the sound pressure level is constant; the optical filter is used for filtering the excitation light signals mixed into the fluorescent signals and stray light of a system light path; the signal detection module receives the fluorescent signal transmitted by the optical filter and converts the fluorescent signal into an electric signal; the signal processing module is used for obtaining the fluorescence life under different temperatures and different sound pressures according to the electric signals converted by the signal detection module, and obtaining the temperature and sound pressure to be monitored according to the fluorescence life under different temperatures and different sound pressures. The light source output module consists of a signal generator and a voltage-current conversion integrated module, wherein the signal generator generates an electric pulse signal with preset frequency and pulse width, and the voltage signal generated by the signal generator is converted into a current signal through the voltage-current conversion integrated module so as to drive the laser diode to output a corresponding light pulse signal and excite the fluorescent material to generate a fluorescent signal. The optical fiber fluorescence sensing probe is used for measuring temperature and sound pressure of sensitivity of fluorescent materials to temperature and stress. The excitation light output by the lig