CN116465852A - Liquid-phase infrared spectrum measuring method and device based on infrared short pulse excitation - Google Patents
Liquid-phase infrared spectrum measuring method and device based on infrared short pulse excitation Download PDFInfo
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- 239000007791 liquid phase Substances 0.000 title claims abstract description 80
- 238000002329 infrared spectrum Methods 0.000 title claims abstract description 65
- 230000005284 excitation Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 58
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 230000031700 light absorption Effects 0.000 claims abstract description 3
- 239000000523 sample Substances 0.000 claims description 73
- 239000013068 control sample Substances 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 7
- 238000004566 IR spectroscopy Methods 0.000 claims description 6
- 206010024769 Local reaction Diseases 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000004476 mid-IR spectroscopy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Classifications
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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
- G01N21/17—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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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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
-
- 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 the technical field of liquid phase measurement, and discloses a liquid phase infrared spectrum measurement method and device based on infrared short pulse excitation, wherein the method comprises the following steps: setting a sample measurement plane of a liquid phase to be measured, using detection light to enter the sample measurement plane, using a photoelectric detector to receive optical signals reflected by the detection light through the sample measurement plane in real time and converting the optical signals into electric signals; the method comprises the steps of (1) incidence of short-pulse mid-infrared light on a sample measurement plane, local photo-thermal reaction, photo-acoustic reaction and the like of mid-infrared light absorption of a liquid phase to be detected at the sample measurement plane, and formation of optical property differences at two sides of the plane, and obtaining the absorption intensity of the mid-infrared light of the liquid phase to be detected according to the electric signal changes before and after incidence of the mid-infrared light; changing the incident wavelength of the mid-infrared light, and combining the absorption intensity of the mid-infrared light of the liquid phase to be detected to obtain the mid-infrared spectrum of the liquid phase to be detected; the device comprises a sample cell and a module for realizing the steps of the method. The invention can realize the mid-infrared spectrum measurement of the liquid sample by the mid-infrared light of short pulse.
Description
Technical Field
The invention relates to the technical field of liquid phase measurement, in particular to a liquid phase infrared spectrum measurement method and device based on infrared short pulse excitation.
Background
The mid-infrared spectrum measurement is a method for performing spectrum measurement by using mid-infrared light, wherein the mid-infrared light is generally light wave with the wavelength of 3-12 microns, and the fundamental frequency vibration at the wavelength is the strongest absorption vibration in infrared active vibration, so that the mid-infrared light is most suitable for qualitative and quantitative analysis of infrared spectrum.
Although the application of infrared spectrum measurement in the prior art is wide, the mid-infrared spectrum measurement is limited to dry sample measurement due to the problems of water absorption background and the like, and is difficult to be applied to liquid components for spectrum measurement.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects in the prior art, and provide the liquid-phase infrared spectrum measurement method and device based on infrared short pulse excitation, which can realize the mid-infrared spectrum measurement of the liquid sample through the mid-infrared light of the short pulse.
In order to solve the technical problems, the invention provides a liquid-phase infrared spectrum measuring method based on infrared short pulse excitation, which comprises the following steps:
setting a sample measurement plane of a liquid phase to be measured, using detection light to enter the sample measurement plane, using a photoelectric detector to receive optical signals reflected by the detection light through the sample measurement plane in real time and converting the optical signals into electric signals;
the method comprises the steps of incidence of short-pulse mid-infrared light on a sample measurement plane, local reaction of mid-infrared light absorption by a liquid phase to be detected at the sample measurement plane and optical property difference formation at two sides of the sample measurement plane, wherein the reaction comprises photo-thermal reaction and photo-acoustic reaction, and absorption intensity of the mid-infrared light incident by the liquid phase to be detected is obtained according to electric signal changes before and after incidence of the mid-infrared light;
and changing the incident wavelength of the mid-infrared light, and combining the absorption intensity of the incident mid-infrared light of the liquid phase to be detected to obtain the mid-infrared spectrum of the liquid phase to be detected.
The invention also provides a liquid-phase infrared spectrum measuring device based on infrared short pulse excitation, which comprises:
the liquid phase to be detected is placed in the sample tank, and the sample tank comprises a plane which has a reflection effect and transmits infrared light;
the light generation module is used for generating detection light and middle infrared light with different wavelengths, and the middle infrared light is short pulse light; the detection light is incident into the sample cell from the plane, the mid-infrared light with each wavelength is respectively incident into the sample cell from the plane in stages, the mid-infrared light is absorbed by a liquid phase to be detected at the plane to generate local reaction, and optical property differences are formed at two sides of the plane, wherein the reaction comprises photo-thermal reaction and photo-acoustic reaction;
the signal acquisition module comprises a photoelectric detector, and the photoelectric detector receives the optical signal of the detection light reflected by the plane in real time and converts the optical signal into an electric signal;
and the data processing module is used for obtaining the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths according to the electric signal change before and after the incidence of the mid-infrared light of the different wavelengths and obtaining the mid-infrared spectrum of the liquid to be detected according to the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths.
In one embodiment of the invention, the horizontal bottom surface of the sample cell is a plane with reflection and light transmission for infrared rays.
In one embodiment of the invention, the data processing module comprises:
a signal processing circuit for preprocessing the electric signal;
the data acquisition circuit samples the preprocessed electric signals and converts the sampled electric signals into digital signals;
and the upper computer is used for obtaining the absorption intensity of the middle infrared light of the liquid to be detected relative to the different wavelengths according to the change of the digital signals before and after the incidence of the middle infrared light of the different wavelengths and obtaining the middle infrared spectrum of the liquid to be detected according to the absorption intensity of the middle infrared light of the liquid to be detected relative to the different wavelengths.
In one embodiment of the invention, the sample cell structure also comprises a control sample cell with the same structure as the sample cell, the content of the components to be measured in the control sample cell is empty, the detection light and the mid-infrared light with different wavelengths are incident to the control sample cell while being incident to the sample cell, and the photoelectric detector respectively receives the optical signals of the detection light reflected by the plane of the sample cell and the optical signals reflected by the plane of the control sample cell and converts the optical signals into electric signals;
obtaining a mid-infrared spectrum of a liquid phase to be measured according to the changes of the electric signals before and after the mid-infrared light with different wavelengths is incident to the sample cell, and obtaining a mid-infrared spectrum of a measurement background according to the changes of the electric signals before and after the mid-infrared light with different wavelengths is incident to the control sample cell;
and carrying out differential analysis on the mid-infrared spectrum of the liquid phase to be detected and the mid-infrared spectrum of the measurement background to obtain the final mid-infrared spectrum of the liquid phase to be detected.
In one embodiment of the present invention, the optical module further includes a light splitting module, the light splitting module including:
the spectroscope is arranged at the emitting port of the mid-infrared light and is used for dividing the mid-infrared light into two beams;
the reflecting mirror is used for changing the propagation direction of the middle infrared light split into two beams by the spectroscope, so that the two beams of middle infrared light respectively irradiate to the sample cell and the control sample cell;
and the lens is used for condensing the two middle infrared lights incident to the sample cell and the control sample cell.
In one embodiment of the invention, the device further comprises a total reflection module, wherein the detection light and the mid-infrared light with different wavelengths are incident into the sample cell through the total reflection module;
the total reflection module is arranged on one side of the plane and is positioned outside the sample cell and used for improving the reflectivity of the detection light and the influence of local reaction on the reflected light, so that the measurement sensitivity is improved.
In one embodiment of the invention, the total reflection module is in a trapezoid structure, the long bottom edge of the trapezoid is arranged close to the plane, and the mid-infrared light with different wavelengths is incident into the sample cell through the short bottom edge of the trapezoid;
the detection light is emitted from one inclined edge of the trapezoid, reflected by the plane and emitted from the other inclined edge of the trapezoid, and the photoelectric detector receives the light signal emitted from the inclined edge in real time and converts the light signal into an electric signal.
The invention also provides a computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation.
The invention also provides a device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation when executing the computer program.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the invention obtains the mid-infrared spectrum of the liquid phase to be detected by exciting the photo-thermal and acoustic effects generated by the liquid phase to be detected by the mid-infrared light of the short pulse, realizes the mid-infrared spectrum measurement of the liquid sample, and can be widely applied to the scenes of chemical substance identification, quantitative analysis of concentration and the like.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
fig. 1 is a flow chart of the method of the present invention.
FIG. 2 is a schematic diagram of the mid-IR spectrum of the collected liquid phase under test.
Fig. 3 is a schematic view of the structure of the device of the present invention.
FIG. 4 is a schematic diagram of the structure of the control sample cell added in the present invention.
FIG. 5 is a schematic diagram of differential signal analysis of acquired mid-IR spectra in an embodiment of the invention.
Fig. 6 is a schematic diagram of the structure of the total reflection module added in the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1, the invention discloses a liquid-phase infrared spectrum measuring method based on infrared short pulse excitation, which comprises the following steps:
step 1: setting a sample measurement plane of a liquid phase to be measured (uniform solution is a phase and is called liquid phase), using detection light to enter the sample measurement plane, using a Photoelectric Detector (PD) to receive optical signals reflected by the detection light through the sample measurement plane in real time and converting the optical signals into electric signals; the detection light in this embodiment may be visible light.
Step 2: and (3) short-pulse mid-infrared (MIR) light is incident to the sample measurement plane, the energy of mid-infrared light absorbed by the liquid phase to be measured at the sample measurement plane generates local photo-thermal, photo-acoustic and other reactions, optical property differences are formed at two sides of the measurement plane, and the absorption intensity of the liquid phase to be measured relative to the incident mid-infrared light is obtained according to the electric signal changes before and after the mid-infrared light is incident.
Step 3: and changing the incident wavelength of the mid-infrared light, and combining the absorption intensity of the incident mid-infrared light of the liquid phase to be detected to obtain the mid-infrared spectrum of the liquid phase to be detected.
The principle of the invention is as follows: the instantaneous heat and local temperature rise are generated when the liquid phase to be measured at the sample measurement plane absorbs mid-infrared light, and the pulse width of the mid-infrared light is short, the instantaneous heat generated by the liquid phase to be measured at the sample measurement plane is insufficient for thermal diffusion form relaxation (relaxation refers to a process of gradually recovering to an equilibrium state from a certain state in a certain gradual physical process), at this time, part of energy is locally expanded through a photoacoustic effect (a phenomenon that mechanical waves are generated when a substance is irradiated by light with periodical intensity modulation), so that ultrasonic waves are generated. When this occurs, localized thermal and acoustic effects will change the optical properties such as refractive index on both sides of the interface.
Therefore, when the detection light incident from the side surface is reflected by the middle infrared light and the action position of the sample, and the thermal and acoustic effects are generated, the photoelectric detector can sense the change of the optical properties of the two sides of the measurement plane of the sample and convert the change into the signal change on the photoelectric detector, such as the change of intensity, the change of intensity falling on the detector after the deflection change of the direction of the reflected light, and the like. The absorption intensity of the incident mid-infrared wavelength of the liquid phase to be measured at the sample measurement plane can be deduced through the intensity change of the measurement signals. The mid-infrared spectrum is a curve of absorption change of a substance to different infrared wavelengths, and is directly obtained according to different molecular vibration frequencies; therefore, the mid-infrared spectrum of the liquid phase to be detected can be obtained by changing the wavelength of the incident mid-infrared light.
The mid-infrared spectrum of the liquid phase to be detected which can be obtained in the embodiment is shown in fig. 2, and the mid-infrared spectrum curve in fig. 2 shows the relation that the strength of the detection signal changes along with the vibration frequency of the molecules; omega represents wave number in cm -1 。
Example two
As shown in fig. 3, this embodiment discloses a liquid-phase infrared spectrum measurement device based on infrared short pulse excitation, which includes a sample cell, a light generation module, a signal acquisition module and a data processing module.
The liquid phase to be measured is placed in the sample cell, and the sample cell comprises a plane which has a reflection effect and transmits infrared light. The horizontal bottom surface of the sample cell is a plane with reflection function and light transmission for infrared rays. The bottom surface of the sample cell is provided with the bottom optical device with the reflection function and transmitting infrared light, so that the liquid phase of the measuring part is in a relatively static state, the influence of the outside on the liquid phase of the measuring part is reduced, and the accuracy of optical signal measurement is improved. The material having reflection and transmitting infrared light may be calcium fluoride (CaF) 2 ) Barium fluoride (BaF 2), and the like.
The light generation module is used for generating detection light and middle infrared light with different wavelengths, and the middle infrared light is short pulse light; the detection light is incident into the sample cell from the plane, the mid-infrared light with each wavelength is respectively incident into the sample cell from the plane in stages, the liquid phase to be detected at the plane absorbs the energy of the mid-infrared light to generate local photo-thermal reaction, photo-acoustic reaction and the like, and optical property differences are formed at two sides of the plane;
the signal acquisition module comprises a photoelectric detector, and the photoelectric detector receives the optical signal of the detection light reflected by the plane in real time and converts the optical signal into an electric signal;
the data processing module obtains the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths according to the electric signal change before and after the incidence of the mid-infrared light of the different wavelengths, and obtains the mid-infrared spectrum of the liquid to be detected according to the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths.
In this embodiment, the data processing module includes a signal processing circuit, a Data Acquisition (DAQ) circuit and an upper computer. The signal processing circuit performs preprocessing on the electric signal, wherein the preprocessing comprises operations such as amplification, low-pass filtering, high-pass filtering, band-pass filtering and the like. The data acquisition circuit samples the preprocessed electrical signals and converts the sampled electrical signals into digital signals. And the upper computer obtains the absorption intensity of the mid-infrared light of the liquid to be measured relative to the different wavelengths according to the change of the digital signals before and after the incidence of the mid-infrared light of the different wavelengths, and obtains the mid-infrared spectrum of the liquid to be measured according to the absorption intensity of the mid-infrared light of the liquid to be measured relative to the different wavelengths. The upper computer can be a PC.
As shown in fig. 4, the liquid-phase infrared spectrum measurement device based on infrared short pulse excitation in this embodiment further includes a control sample cell with the same structure as the sample cell, where the content of the component to be measured in the control sample cell is empty, and in this embodiment, the reference liquid in the control sample cell may be pure water only; the detection light and the mid-infrared light with different wavelengths are incident to the control sample cell while being incident to the sample cell, and the photoelectric detector is used for respectively receiving optical signals of the detection light reflected by the plane of the sample cell and optical signals reflected by the plane of the control sample cell and converting the optical signals into electric signals. Obtaining the mid-infrared spectrum of the liquid phase to be measured according to the electric signal changes before and after the mid-infrared light with different wavelengths is incident to the sample cell, and obtaining the mid-infrared spectrum of the measuring background according to the electric signal changes before and after the mid-infrared light with different wavelengths is incident to the control sample cell. And carrying out differential analysis on the mid-infrared spectrum of the liquid phase to be detected and the mid-infrared spectrum of the measurement background to obtain the final mid-infrared spectrum of the liquid phase to be detected. The first graph in fig. 5 is an exemplary acquired mid-infrared spectrum of the liquid phase to be measured, the second graph is an acquired mid-infrared spectrum of the measurement background, the third graph is a final mid-infrared spectrum of the liquid phase to be measured obtained according to the first two differences, and the differential analysis may be to directly perform the difference on the two graphs, that is, the final mid-infrared spectrum=the mid-infrared spectrum of the liquid phase to be measured-the mid-infrared spectrum of the measurement background, so as to eliminate the problem of the water background existing in the measurement.
The liquid-phase infrared spectrum measuring device based on infrared short pulse excitation in the embodiment further comprises a light splitting module, wherein the light splitting module comprises a spectroscope, a reflecting mirror and a lens. The spectroscope is arranged at the emitting port of the mid-infrared light and is used for dividing the mid-infrared light into two beams. The reflecting mirror is used for changing the propagation direction of the middle infrared light split into two beams by the spectroscope, so that the two beams of middle infrared light respectively irradiate to the sample cell and the control sample cell. The lens is used for condensing the two middle infrared lights incident on the sample cell and the control sample cell.
As shown in fig. 6, the liquid-phase infrared spectrum measurement device based on infrared short pulse excitation in the embodiment further includes a total reflection module, through which the detection light and the mid-infrared light with different wavelengths are incident into the sample cell; the total reflection module is arranged on one side of the plane and is positioned outside the sample cell, and in the embodiment, the total reflection module is arranged at the bottom of the sample cell and is used for improving the reflectivity of detection light and the influence of photo-thermal reaction, photo-acoustic reaction and other reactions on the reflected light, so that the sensitivity of measurement is improved.
The total reflection module is of a trapezoid structure, the long bottom edge of the trapezoid is arranged close to the plane, and middle infrared light with different wavelengths is incident into the sample cell through the short bottom edge of the trapezoid; the detection light is emitted from one inclined edge of the trapezoid, reflected by the plane and emitted from the other inclined edge of the trapezoid, and the photoelectric detector receives the light signal emitted from the inclined edge in real time and converts the light signal into an electric signal. The mid-infrared light is normally incident from the short side of the trapezoid, the detection light is incident from the bevel side of the trapezoid, and the total reflection phenomenon occurs on the bottom surface of the sample cell. The total reflection is a critical state, once the mid-infrared light is incident into the sample cell, the chemical property of the liquid phase to be detected at the bottom surface of the sample cell is changed, the total reflection condition is destroyed, and the light signal received by the photoelectric detector is greatly changed, so that the measurement sensitivity is improved. The shape of the total reflection module can be adjusted according to the requirement, and can be elliptical, rectangular, diamond-shaped and other shapes.
Example III
In this embodiment, a computer-readable storage medium is disclosed, on which a computer program is stored, which when executed by a processor, implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation in embodiment one.
Example IV
In this embodiment, an apparatus is disclosed that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation in embodiment one when executing the computer program.
The invention obtains the mid-infrared spectrum of the liquid phase to be detected by exciting the photo-thermal and acoustic effects generated by the liquid phase to be detected by the mid-infrared light of the short pulse, realizes the mid-infrared spectrum measurement of the liquid sample, and can be widely applied to the scenes of chemical substance identification, quantitative analysis of concentration and the like.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The liquid phase infrared spectrum measuring method based on infrared short pulse excitation is characterized by comprising the following steps of:
setting a sample measurement plane of a liquid phase to be measured, using detection light to enter the sample measurement plane, using a photoelectric detector to receive optical signals reflected by the detection light through the sample measurement plane in real time and converting the optical signals into electric signals;
the method comprises the steps of incidence of short-pulse mid-infrared light on a sample measurement plane, local reaction of mid-infrared light absorption by a liquid phase to be detected at the sample measurement plane and optical property difference formation at two sides of the sample measurement plane, wherein the reaction comprises photo-thermal reaction and photo-acoustic reaction, and absorption intensity of the mid-infrared light incident by the liquid phase to be detected is obtained according to electric signal changes before and after incidence of the mid-infrared light;
and changing the incident wavelength of the mid-infrared light, and combining the absorption intensity of the incident mid-infrared light of the liquid phase to be detected to obtain the mid-infrared spectrum of the liquid phase to be detected.
2. A liquid phase infrared spectrum measuring device based on infrared short pulse excitation, characterized by comprising:
the liquid phase to be detected is placed in the sample tank, and the sample tank comprises a plane which has a reflection effect and transmits infrared light;
the light generation module is used for generating detection light and middle infrared light with different wavelengths, and the middle infrared light is short pulse light; the detection light is incident into the sample cell from the plane, the mid-infrared light with each wavelength is respectively incident into the sample cell from the plane in stages, the mid-infrared light is absorbed by a liquid phase to be detected at the plane to generate local reaction, and optical property differences are formed at two sides of the plane, wherein the reaction comprises photo-thermal reaction and photo-acoustic reaction;
the signal acquisition module comprises a photoelectric detector, and the photoelectric detector receives the optical signal of the detection light reflected by the plane in real time and converts the optical signal into an electric signal;
and the data processing module is used for obtaining the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths according to the electric signal change before and after the incidence of the mid-infrared light of the different wavelengths and obtaining the mid-infrared spectrum of the liquid to be detected according to the absorption intensity of the mid-infrared light of the liquid to be detected relative to the different wavelengths.
3. The liquid-phase infrared spectrum measuring device based on infrared short pulse excitation according to claim 2, wherein: the horizontal bottom surface of the sample cell is a plane with reflection function and light transmission for infrared rays.
4. The infrared short pulse excitation-based liquid phase infrared spectrum measurement device of claim 2, wherein the data processing module comprises:
a signal processing circuit for preprocessing the electric signal;
the data acquisition circuit samples the preprocessed electric signals and converts the sampled electric signals into digital signals;
and the upper computer is used for obtaining the absorption intensity of the middle infrared light of the liquid to be detected relative to the different wavelengths according to the change of the digital signals before and after the incidence of the middle infrared light of the different wavelengths and obtaining the middle infrared spectrum of the liquid to be detected according to the absorption intensity of the middle infrared light of the liquid to be detected relative to the different wavelengths.
5. The infrared short pulse excitation-based liquid phase infrared spectrum measuring device according to any one of claims 2 to 4, wherein: the photoelectric detector receives optical signals reflected by the plane of the sample cell and optical signals reflected by the plane of the control sample cell respectively and converts the optical signals into electric signals;
obtaining a mid-infrared spectrum of a liquid phase to be measured according to the changes of the electric signals before and after the mid-infrared light with different wavelengths is incident to the sample cell, and obtaining a mid-infrared spectrum of a measurement background according to the changes of the electric signals before and after the mid-infrared light with different wavelengths is incident to the control sample cell;
and carrying out differential analysis on the mid-infrared spectrum of the liquid phase to be detected and the mid-infrared spectrum of the measurement background to obtain the final mid-infrared spectrum of the liquid phase to be detected.
6. The liquid-phase infrared spectrum measuring device based on infrared short pulse excitation according to claim 5, wherein: still include the beam split module, the beam split module includes:
the spectroscope is arranged at the emitting port of the mid-infrared light and is used for dividing the mid-infrared light into two beams;
the reflecting mirror is used for changing the propagation direction of the middle infrared light split into two beams by the spectroscope, so that the two beams of middle infrared light respectively irradiate to the sample cell and the control sample cell;
and the lens is used for condensing the two middle infrared lights incident to the sample cell and the control sample cell.
7. The infrared short pulse excitation-based liquid phase infrared spectrum measuring device according to any one of claims 2 to 4, wherein: the device also comprises a total reflection module, wherein the detection light and the mid-infrared light with different wavelengths are incident into the sample cell through the total reflection module;
the total reflection module is arranged on one side of the plane and is positioned outside the sample cell and used for improving the reflectivity of the detection light and the influence of local reaction on the reflected light, so that the measurement sensitivity is improved.
8. The infrared short pulse excitation-based liquid phase infrared spectrum measurement device according to claim 7, wherein: the total reflection module is of a trapezoid structure, the long bottom edge of the trapezoid is arranged close to the plane, and middle infrared light with different wavelengths is incident into the sample cell through the short bottom edge of the trapezoid;
the detection light is emitted from one inclined edge of the trapezoid, reflected by the plane and emitted from the other inclined edge of the trapezoid, and the photoelectric detector receives the light signal emitted from the inclined edge in real time and converts the light signal into an electric signal.
9. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed by a processor, implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation as claimed in claim 1.
10. An apparatus, characterized in that: comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which processor, when executing the computer program, implements the liquid-phase infrared spectrometry method based on infrared short pulse excitation as claimed in claim 1.
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