CN113125379A - Noninvasive accurate gas detection device and method based on optical fiber supercontinuum laser - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 96
- 238000001228 spectrum Methods 0.000 claims description 21
- 230000003595 spectral effect Effects 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000000862 absorption spectrum Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 230000000241 respiratory effect Effects 0.000 abstract description 27
- 230000035945 sensitivity Effects 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 9
- 238000003745 diagnosis Methods 0.000 abstract description 6
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 8
- 230000004060 metabolic process Effects 0.000 description 5
- 230000036541 health Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000001727 in vivo Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000035790 physiological processes and functions Effects 0.000 description 1
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
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- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention relates to a non-invasive accurate gas detection device and a method based on optical fiber supercontinuum laser.A signal source is respectively connected with the input end of a first phase-locked amplifier and the input end of a frequency multiplier, the output end of a constant current source is connected with the input end of a supercontinuum light source, the signal source is connected with a lead which is connected with the constant current source and the supercontinuum light source and is used for carrying out sinusoidal modulation on current injected into the supercontinuum light source, the output end of the frequency multiplier is connected with the input end of a second phase-locked amplifier, the supercontinuum light source, an air chamber and a photoelectric detector are sequentially connected, and the output end of the photoelectric detector. The invention has the beneficial effects that: the brand new technical scheme of the frequency modulation harmonic detection outside the cavity based on the optical fiber supercontinuum laser meets the application requirements of high signal-to-noise ratio, high sensitivity and the like of the respiratory gas accurate analysis medical diagnosis application, and realizes the measurement and identification of oxygen, carbon dioxide and other related gases in the respiratory gas.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a noninvasive accurate gas detection device and method based on optical fiber supercontinuum laser.
Background
The breathing runs through the life of human body, the composition of each person's exhalation composition is unique and stable, and has important physiological significance, but so far, the individualized accurate determination and evaluation of respiratory metabolism indexes such as respiratory gas composition, concentration and the like detected in real time under different pathophysiological states of human body can not be realized, more respiratory gas composition analysis can not be better obtained, gases with different concentrations and different compositions can not be quantitatively identified, and the deep research on the respiratory gas metabolism and the internal mechanism of body health, diagnosis and disease prediction is hindered.
Disclosure of Invention
The invention aims to solve the technical problem of providing a noninvasive accurate gas detection device and method based on optical fiber supercontinuum laser, meeting the application requirements of high signal-to-noise ratio, high sensitivity and the like of respiratory gas accurate analysis medical diagnosis application, and realizing the measurement and identification of oxygen, carbon dioxide and other related gases in respiratory gas.
The technical scheme for solving the technical problems is as follows: a noninvasive accurate gas detection device based on optical fiber supercontinuum laser comprises a signal source, a frequency multiplier, a constant current source, a supercontinuum light source, a gas chamber, a photoelectric detector, a first phase-locked amplifier, a second phase-locked amplifier, a divider, an A/D converter and a computer, wherein the signal source is respectively connected with the input end of the first phase-locked amplifier and the input end of the frequency multiplier, the output end of the constant current source is connected with the input end of the supercontinuum light source, the signal source is connected with a lead which is connected with the constant current source and the supercontinuum light source and is used for carrying out sinusoidal modulation on current injected into the supercontinuum light source, the output end of the frequency multiplier is connected with the input end of the second phase-locked amplifier, the supercontinuum light source, the gas chamber and the photoelectric detector are sequentially connected, and optical signals of, the output end of the photoelectric detector is respectively connected with the input ends of the first phase-locked amplifier and the second phase-locked amplifier, the output end of the first phase-locked amplifier and the output end of the second phase-locked amplifier are both connected with the input end of the divider, and the output end of the divider is sequentially connected with the A/D converter and the computer.
The invention has the beneficial effects that: the optical fiber gas sensor has the characteristics of high sensitivity, high precision, high resolution, large dynamic range and the like, has higher sensitivity, high discriminativity and high response speed, is most suitable for respiratory gas detection application, meets the application requirements of high signal-to-noise ratio, high sensitivity and the like of respiratory gas accurate analysis medical diagnosis application based on a brand-new technical scheme of the extraluminal frequency modulation harmonic detection of the optical fiber supercontinuum laser, and realizes the measurement and discrimination of oxygen, carbon dioxide and other related gases in the respiratory gas.
On the basis of the technical scheme, the invention can be further improved as follows.
The output end of the signal source is connected with the input end of the amplifier, and the output end of the amplifier is connected with the input end of the supercontinuum light source.
The beneficial effect of adopting the further scheme is that: the amplifier is arranged to amplify the signal input by the signal source, so that the current input to the supercontinuum light source is controlled.
And the adjustable filter is arranged between the super-continuum spectrum light source and the gas chamber and used for controlling the spectrum width and the spectrum center wavelength entering the gas chamber according to requirements.
The beneficial effect of adopting the further scheme is that: thereby through setting up adjustable filter plate control the spectral width and the spectrum center wavelength that get into the gas chamber, to the gas that awaits measuring of difference, cover its absorption spectral line, consequently make the device detectable more gas composition targets.
The temperature controller is connected with the super-continuum spectrum light source and used for controlling the temperature of the super-continuum spectrum light source.
The beneficial effect of adopting the further scheme is that: the stability of the temperature of the supercontinuum light source affects the accuracy of detected data, larger temperature fluctuation can cause the drift of output wavelength, and larger thermal shock can shorten the service life of the supercontinuum light source and damage the supercontinuum light source.
The invention also provides a noninvasive accurate gas detection method based on the optical fiber supercontinuum laser, which adopts the noninvasive accurate gas detection device based on the optical fiber supercontinuum laser to detect gas and comprises the following steps:
selecting corresponding absorption spectrum lines from a high-resolution spectrum database according to the type of the gas to be detected, and extracting spectral parameters of the absorption spectrum lines: absorption coefficient alpha of gas molecules at absorption peak0；
Adjusting the super-continuum spectrum light source to enable the light source center frequency of the super-continuum spectrum light source to be stabilized at v0At least one of (1) and (b);
inputting a high-frequency sinusoidal signal generated by a signal source into the super-continuum spectrum light source to adjust the output frequency of the super-continuum spectrum light source, wherein when the current of the light source is modulated sinusoidally, the frequency and the output light intensity of the light source are correspondingly modulated:
v＝v0+vm sinωt
Ii(t)＝I0[1+ηsinωt]
wherein, v0Is the center frequency, v, of the modulationmIs the frequency modulation amplitude; η is the light intensity modulation factor; ω ═ 2 pi f, f is the current modulation frequency;
step four, confirming the incident light intensity I of the super-continuum spectrum light source0And light is atThe mileage L in the air chamber is detected and detected by a photoelectric detector to obtain the transmitted light intensity I (t), according to the formula:
the coefficients of the first harmonic and the second harmonic can be found to be:
If＝I0η
I2f＝-ka0CLI0，
in the formula (I), the compound is shown in the specification,
x＝vmv, [ delta ] v is the half width of the absorption line;
therefore, the concentration C of the gas to be measured can be obtained according to the formula.
The beneficial effect who adopts above-mentioned scheme is: the invention has the characteristics of high sensitivity, high precision, high resolution, large dynamic range and the like, has higher sensitivity, high distinguishability and high response speed, is most suitable for respiratory gas detection application, meets the application requirements of high signal-to-noise ratio, high sensitivity and the like of respiratory gas accurate analysis medical diagnosis application based on a brand-new technical scheme of the extraluminal frequency modulation harmonic detection of the optical fiber supercontinuum laser, and realizes the measurement and the distinguishment of oxygen, carbon dioxide and other related gases in the respiratory gas.
Further, in the second step and the third step, the temperature controller is used for carrying out fixed-point constant-temperature control on the supercontinuum light source.
The beneficial effect of adopting the further scheme is that: the stability of the temperature of the supercontinuum light source affects the accuracy of detected data, larger temperature fluctuation can cause the drift of output wavelength, and larger thermal shock can shorten the service life of the supercontinuum light source and damage the supercontinuum light source.
Further, in the second step, the spectral width and the spectral center wavelength entering the gas chamber are controlled by an adjustable filter plate according to requirements so as to be suitable for detection of different gases.
The beneficial effect of adopting the further scheme is that: thereby through setting up adjustable filter plate control the spectral width and the spectrum center wavelength that get into the gas chamber, to the gas that awaits measuring of difference, cover its absorption spectral line, consequently make the device detectable more gas composition targets.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a signal source, 2, a frequency multiplier, 3, a constant current source, 4, a supercontinuum light source, 5, an air chamber, 6, a photoelectric detector, 7, a first phase-locked amplifier, 8, a second phase-locked amplifier, 9, a divider, 10, an A/D converter, 11, a computer, 12, a temperature controller, 13, an amplifier, 14 and an adjustable filter.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention includes a signal source 1, a frequency multiplier 2, a constant current source 3, a supercontinuum light source 4, a gas chamber 5, a photodetector 6, a first phase-locked amplifier 7, a second phase-locked amplifier 8, a divider 9, an a/D converter 10, and a computer 11, where the signal source 1 is connected to an input end of the first phase-locked amplifier 7 and an input end of the frequency multiplier 2, an output end of the constant current source 3 is connected to an input end of the supercontinuum light source 4, the signal source 1 is connected to a wire connecting the constant current source 3 and the supercontinuum light source 4 for performing sinusoidal modulation on a current injected into the supercontinuum light source 4, an output end of the frequency multiplier 2 is connected to an input end of the second phase-locked amplifier 8, the supercontinuum light source 4, the gas chamber 5, and the, through photoelectric detector 6 will pass through the light signal conversion of the light of air chamber 5 is the signal of telecommunication, photoelectric detector 6 the output respectively with first lock phase amplifier 7 with the input of second lock phase amplifier 8 is connected, the output of first lock phase amplifier 7 and the output of second lock phase amplifier 8 all with divider 9's input is connected, divider 9's output connects gradually AD converter 10 with computer 11.
In the present embodiment, the lock-in amplifier 13 is an electronic instrument for measuring dynamic signals. Its main components are an oscillator, a mixer and a low-pass filter, the most basic and most common function of which is to measure the phase and amplitude of a signal of a certain frequency from a signal which is swamped by noise. The photodetector 6 can convert the optical signal into an electrical signal. The analog-to-digital converter is a converter for converting an analog quantity after comparison with a standard quantity (or a reference quantity) into a discrete signal represented by a binary number, which is referred to as an ADC or an a/D converter 10. A circuit in which the frequency multiplier 2 makes the frequency of the output signal equal to an integral multiple of the frequency of the input signal.
Preferably, the current control circuit further comprises an amplifier 13, wherein the output end of the signal source 1 is connected with the input end of the amplifier 13, the output end of the amplifier 13 is connected with the input end of the supercontinuum light source 4, and the amplifier 13 is arranged to amplify the signal input by the signal source 1 so as to control the current input to the supercontinuum light source 4.
Further, the device also comprises an adjustable filter plate 14, wherein the adjustable filter plate 14 is arranged between the supercontinuum light source 4 and the gas chamber 5 and used for controlling the spectrum width and the spectrum center wavelength entering the gas chamber 5 according to needs, the adjustable filter plate 14 is arranged so as to control the spectrum width and the spectrum center wavelength entering the gas chamber 5, and the absorption spectrum lines of different gases to be detected are covered, so that the device can detect more gas component targets.
In this embodiment, the system further comprises a temperature controller 12, wherein the temperature controller 12 is connected with the supercontinuum light source 4 and is used for controlling the temperature of the supercontinuum light source 4. The stability of the temperature of the supercontinuum light source 4 affects the accuracy of detected data, large temperature fluctuation causes drift of output wavelength, and large thermal shock shortens the service life of the supercontinuum light source 4 to damage the supercontinuum light source 4.
The invention also discloses a noninvasive accurate gas detection method based on the optical fiber supercontinuum laser, which adopts the noninvasive accurate gas detection device based on the optical fiber supercontinuum laser to detect gas and comprises the following steps:
selecting corresponding absorption spectrum lines from a high-resolution spectrum database according to the type of the gas to be detected, and extracting spectral parameters of the absorption spectrum lines: absorption coefficient alpha of gas molecules at absorption peak0；
Step two, adjusting the super-continuum spectrum light source 4 to enable the light source center frequency of the super-continuum spectrum light source 4 to be stabilized at v0Treating:
inputting the high-frequency sinusoidal signal generated by the signal source 1 into the supercontinuum light source 4 to adjust the output frequency of the supercontinuum light source 4, wherein when the light source current is modulated sinusoidally, the frequency and the output light intensity of the light source are also modulated correspondingly:
v＝v0+vmsinωt
Ii(t)＝I0[1+ηsinωt]
wherein, v0Is the modulated center frequency, vmIs the frequency modulation amplitude; η is the light intensity modulation factor; ω ═ 2 pi f, f is the current modulation frequency;
step four, confirming the incident light intensity I of the super-continuum spectrum light source 40And the mileage L of the light in the air chamber 5, the transmitted light intensity I (t) is detected and detected by the photoelectric detector 6, and according to the formula:
the coefficients of the first harmonic and the second harmonic can be found to be:
If＝I0η
I2f＝-ka0CLI0，
in the formula (I), the compound is shown in the specification,
x＝vmthe/delta v is the half width of an absorption line;
therefore, the concentration C of the gas to be measured can be obtained according to the formula.
Further, in the second step and the third step, the temperature controller 12 is used for performing fixed-point constant temperature control on the supercontinuum light source 4, the stability of the temperature of the supercontinuum light source 4 can affect the accuracy of detected data, larger temperature fluctuation can cause the drift of output wavelength, and larger thermal shock can shorten the service life of the supercontinuum light source 4 and damage the supercontinuum light source 4.
In the second step, the spectral width and the spectral center wavelength entering the gas chamber 5 are controlled by the adjustable filter 14 as required to be suitable for detection of different gases, the spectral width and the spectral center wavelength entering the gas chamber 5 are controlled by setting the adjustable filter 14, and the absorption spectrum lines of different gases to be detected are covered, so that the device can detect more gas component targets.
The gas detection device based on the optical fiber supercontinuum laser in the embodiment is applied to medical clinical detection, and preferably has the following parameters: respiratory gas detection sensitivity: not less than 10-6; respiratory gas detection category: not less than 2; respiratory gas profile detection wavelength range: 450-; respiratory gas atlas detection resolution: not more than 5 nm; breathing gas detection uncertainty: less than 5%.
Clinical verification of respiratory gas metabolism detection and data acquisition are realized. Clinical verification of respiratory gas metabolism detection, data acquisition and standard formulation, dynamic comparison and analysis of a resting state machine and an active state machine, accurate determination of oxygen content, carbon dioxide content, respiratory quotient and determination and identification of other gases.
The optical fiber gas sensor has the characteristics of high sensitivity, high precision, high resolution, large dynamic range and the like, has higher sensitivity, high discriminativity and high response speed, is most suitable for respiratory gas detection application, meets the application requirements of high signal-to-noise ratio, high sensitivity and the like of respiratory gas accurate analysis medical diagnosis application based on a brand-new technical scheme of the extra-cavity frequency modulation harmonic detection of the optical fiber supercontinuum laser, and realizes the measurement and discrimination of oxygen, carbon dioxide and other related gases in the respiratory gas.
The method provides a new technology of in-vivo, real-time, noninvasive and accurate analysis from the perspective of gas metabolism detection, provides a new technical platform for physiological state analysis and pathological mechanism exploration of normal people, lays a foundation for early disease early warning and targeted health guidance of patients with respiratory gas metabolic abnormality, and is beneficial to health big data acquisition and establishment of national health strategies. As an auxiliary means of modern medical detection, the array combination is carried out by utilizing sensors, and gases with different concentrations are quantitatively identified through a fuzzy neural network. The respiratory gas atlas detection sensing technology based on novel laser such as a super-continuum spectrum is researched, and the high-sensitivity detection sensing of the multi-component respiratory gas is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The noninvasive accurate gas detection device based on the optical fiber supercontinuum laser is characterized by comprising a signal source (1), a frequency multiplier (2), a constant current source (3), a supercontinuum light source (4), an air chamber (5), a photoelectric detector (6), a first phase-locked amplifier (7), a second phase-locked amplifier (8), a divider (9), an A/D converter (10) and a computer (11), wherein the signal source (1) is respectively connected with the input end of the first phase-locked amplifier (7) and the input end of the frequency multiplier (2), the output end of the constant current source (3) is connected with the input end of the supercontinuum light source (4), the signal source (1) is connected with a lead wire which is connected with the constant current source (3) and the supercontinuum light source (4) and is used for carrying out sinusoidal modulation on current injected into the supercontinuum light source (4), the output end of the frequency multiplier (2) is connected with the input end of the second phase-locked amplifier (8), the supercontinuum light source (4), the air chamber (5) and the photoelectric detector (6) are sequentially connected, an optical signal passing through the air chamber (5) is converted into an electric signal through the photoelectric detector (6), the output end of the photoelectric detector (6) is respectively connected with the input ends of the first phase-locked amplifier (7) and the second phase-locked amplifier (8), the output end of the first phase-locked amplifier (7) and the output end of the second phase-locked amplifier (8) are both connected with the input end of the divider (9), and the output end of the divider (9) is sequentially connected with the A/D converter (10) and the computer (11).
2. The fiber optic supercontinuum laser based noninvasive precise gas detecting device according to claim 1, characterized by further comprising a temperature controller (12), wherein the temperature controller (12) is connected with the supercontinuum light source (4) for controlling the temperature of the supercontinuum light source (4).
3. The fiber optic supercontinuum laser based noninvasive precise gas detecting device according to claim 1, characterized by further comprising an amplifier (13), wherein the output end of the signal source (1) is connected with the input end of the amplifier (13), and the output end of the amplifier (13) is connected with the input end of the supercontinuum light source (4).
4. The fiber optic supercontinuum laser based noninvasive precise gas detection device according to any one of claims 1 to 3, characterized by further comprising a tunable filter (14), wherein the tunable filter (14) is arranged between the supercontinuum light source (4) and the gas cell (5) for controlling the spectral width and the spectral center wavelength entering the gas cell (5) according to the need.
5. The non-invasive accurate gas detection method based on the optical fiber supercontinuum laser adopts the non-invasive accurate gas detection device based on the optical fiber supercontinuum laser according to any one of the claims 1 to 4 to detect gas, and is characterized by comprising the following steps:
selecting corresponding absorption spectrum lines from a high-resolution spectrum database according to the type of the gas to be detected, and extracting spectral parameters of the absorption spectrum lines: absorption coefficient alpha of gas molecules at absorption peak0；
Step two, adjusting the super-continuum spectrum light source (4)So that the light source center frequency of the super-continuum spectrum light source (4) is stabilized at v0At least one of (1) and (b);
inputting a high-frequency sinusoidal signal generated by the signal source (1) into the supercontinuum light source (4) to adjust the output frequency of the supercontinuum light source (4), wherein when the light source current is modulated sinusoidally, the frequency and the output light intensity of the light source are also modulated correspondingly:
ν＝v0+νmsinωt
Ii(t)＝I0[1+ηsinωt]
wherein, v0Is the modulated center frequency, vmIs the frequency modulation amplitude; η is the light intensity modulation factor; ω ═ 2 pi f, f is the current modulation frequency;
step four, confirming the incident light intensity I of the super-continuum spectrum light source (4)0And the mileage L of the light in the air chamber (5) is detected and detected by the photoelectric detector (6) according to the transmitted light intensity I (t) and according to the formula:
the coefficients of the first harmonic and the second harmonic can be found to be:
If＝I0η
I2f＝-ka0CLI0，
in the formula (I), the compound is shown in the specification,
x＝vmv, [ delta ] v is the half width of the absorption line;
therefore, the concentration C of the gas to be measured can be obtained according to the formula.
6. The method for noninvasive accurate gas detection based on fiber optic supercontinuum laser according to claim 5, characterized in that in the second step and the third step, the supercontinuum light source (4) is temperature-controlled at fixed point and constant temperature by the temperature controller (12).
7. The method for non-invasive accurate gas detection based on fiber optic supercontinuum laser according to claim 5, characterized in that in the second step, the spectral width and the spectral center wavelength entering the gas chamber (5) are controlled by the adjustable filter (14) as required to be suitable for the detection of different gases.
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