CN111044472A - Farmland mulching film volatile matter detection device and detection method - Google Patents
Farmland mulching film volatile matter detection device and detection method Download PDFInfo
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- 238000002329 infrared spectrum Methods 0.000 claims abstract description 59
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- 230000003595 spectral effect Effects 0.000 claims abstract description 23
- 239000002362 mulch Substances 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 239000002985 plastic film Substances 0.000 claims abstract description 13
- 229920006255 plastic film Polymers 0.000 claims abstract description 13
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- 229920005372 Plexiglas® Polymers 0.000 description 1
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- -1 ethylene, propylene, butylene Chemical group 0.000 description 1
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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
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Abstract
The invention relates to the technical field of farmland mulch volatile matter detection, and discloses a farmland mulch volatile matter detection device and a detection method, wherein the detection device comprises the following steps: the inner part of the transparent container is provided with an accommodating space for accommodating a mulching film to be detected; the gas pool is communicated with the transparent container; the infrared spectrometer is sleeved on the periphery of the gas cell and used for detecting the infrared spectrum of the gas released by the mulching film to be detected entering the gas cell and the air mixture in the gas cell; the vacuum air pump is communicated with the gas pool and is used for pumping gas in the gas pool; and the upper computer is connected with the infrared spectrometer and is used for fitting the spectral peak position and intensity in the infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substances in the spectral library so as to realize detection of the volatile substances in the mulching film to be detected. This farmland plastic film volatile matter detection device has the volatile gaseous advantage of short-term test plastic film that awaits measuring.
Description
Technical Field
The invention relates to the technical field of farmland mulch volatile matter detection, in particular to a farmland mulch volatile matter detection device and a detection method.
Background
The mulching film has the functions of increasing temperature, preserving soil moisture, inhibiting weeds and the like, can effectively improve the crop yield, is popular with farmers, and is particularly more prominent in arid and semiarid northern areas and high mountain cold and cool southern areas. According to statistics, the usage amount of the mulching film in China is up to millions of tons every year, the coverage area is up to tens of millions of hectares, the range is wide, the usage amount is large, and a certain environmental problem is caused while the yield is increased. The residue in the soil can reduce the soil fertility, influence the root development of crops, influence the environment when exposed to the earth surface, and influence the health of livestock and poultry when mixed in the pasture. Therefore, new technologies such as manufacturing and recycling of mulching films have become a focus of research for reducing pollution prevention of mulching films in recent years. However, mulch film volatile contamination is also not negligible. The mulching film is usually made of polyvinyl chloride serving as a main material and combined with other chemical materials, harmful volatile matters such as ethylene, propylene, butylene and the like are released when the mulching film is placed and stored, and a large amount of harmful volatile matters are generated when the mulching film is irradiated by sunlight for a long time at high temperature in the using process, so that the atmospheric environmental pollution is caused, the health of residents is damaged, and the quick and accurate detection of the mulching film volatile matters has important significance. However, the pollution of the volatile matters of the mulching film is often ignored, a corresponding detection method is lacked, and a farmland mulching film volatile matter detection method based on infrared spectroscopy is provided for the current situation, so that the farmland mulching film volatile matters can be rapidly, accurately and repeatedly detected.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a farmland mulch volatile matter detection device and a detection method so as to solve the technical problem that rapid detection of mulch volatile matters cannot be realized in the prior art.
(II) technical scheme
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a farmland mulch volatile matter detection apparatus, comprising: the inner part of the transparent container is provided with an accommodating space for accommodating a mulching film to be detected; the gas pool is communicated with the transparent container; the infrared spectrometer is sleeved on the periphery of the gas cell and used for detecting the infrared spectrum of the gas released by the mulching film to be detected entering the gas cell and the air mixture in the gas cell; the vacuum air pump is communicated with the gas pool and is used for pumping gas in the gas pool; and the upper computer is connected with the infrared spectrometer and is used for fitting the spectral peak position and intensity in the infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substances in the spectral library so as to realize detection of the volatile substances in the mulching film to be detected.
The transparent container comprises a glass tank, a first air outlet is formed in the bottom of the glass tank, and a first air outlet valve is installed at the first air outlet.
The top of the gas pool is provided with a first gas inlet which is communicated with the first gas outlet through a first rubber hose, wherein a first gas inlet valve is arranged on the first gas inlet.
The vacuum air pump is provided with a first air inlet, a first rubber hose is arranged on the first air inlet, a first air outlet is formed in the top of the air pool, a first air inlet is formed in the vacuum air pump, the first air outlet is communicated with the first air inlet through a first rubber hose, a first air outlet valve is installed at the first air outlet, and a first air inlet valve is installed at the first air inlet.
And the gas cell is provided with a gas pressure meter capable of detecting the pressure in the gas cell in real time.
The infrared spectrometer is provided with a gas cell, wherein a through cavity capable of containing the gas cell is formed on the infrared spectrometer, and a light inlet and a light outlet are respectively formed on the gas cell and the part corresponding to the infrared spectrometer.
The gas cell is internally provided with a placing space, the bottom of the placing space is provided with a first reflection lens, the top of the placing space is provided with a second reflection lens, and infrared spectrum passes through the light inlet to enter the gas cell and passes through the light outlet to be emitted into the infrared spectrometer under the multiple reflection of the first reflection lens and the second reflection lens.
Wherein, the manufacturing material of the gas pool comprises organic glass.
According to the second aspect of the invention, the invention also provides a farmland mulching film volatile matter detection method, which comprises the following steps: placing a mulching film to be detected in a transparent container and sealing the transparent container; closing a first air inlet valve on the gas cell, opening a second air outlet valve on the gas cell, pumping the air pressure in the gas cell to be a negative value, detecting the infrared spectrum of the air in the gas cell at the moment, and taking the infrared spectrum as a reference spectrum; closing a second air outlet valve on the gas cell, opening a first air inlet valve on the gas cell, pumping the gas volatilized by the mulching film to be detected in the transparent container into the gas cell, detecting the infrared spectrum of the mixture of the gas volatilized by the mulching film to be detected in the gas cell and the air at the moment when the air pressure in the gas cell is recovered to a normal value, and taking the infrared spectrum as a sample spectrum; removing the reference spectrum of the air from the sample spectrum to obtain the infrared spectrum of the mulching film to be detected; fitting the position and the intensity of the spectral peak in the obtained infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substance in the spectral library to realize the infrared spectrum detection of the mulching film to be detected.
(III) advantageous effects
Compared with the prior art, the farmland mulching film volatile matter detection device provided by the invention has the following advantages:
placing a mulching film to be detected in a transparent container and sealing the transparent container, closing a first air inlet valve on a gas pool, opening a second air outlet valve on the gas pool, pumping the air pressure in the gas pool to a negative value, detecting the infrared spectrum of the air in the gas pool at the moment and taking the infrared spectrum as a reference spectrum, closing a second air outlet valve on the gas pool, opening the first air inlet valve on the gas pool, pumping the gas volatilized from the mulching film to be detected in the transparent container into the gas pool, detecting the infrared spectrum of a mixture of the gas and the air emitted by the mulching film to be detected in the gas pool at the moment and taking the infrared spectrum as a sample spectrum when the air pressure in the gas pool is recovered to a normal value, removing the reference spectrum of the air from the sample spectrum to obtain the infrared spectrum of the mulching film to be detected, and fitting the position and the intensity of a spectral peak in the obtained infrared spectrum of the mulching film to be detected with, so as to realize the infrared spectrum detection of the mulching film to be detected. It can be seen that the farmland plastic film volatile matter detection device of this application has the advantage that the harmful gas in the plastic film that awaits measuring is detected fast, accurately.
Drawings
FIG. 1 is a schematic view of the overall structure of a volatile substance detection device for a farmland mulching film according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of steps of a farmland mulch volatile detection method according to an embodiment of the invention.
Reference numerals:
1: a transparent container; 11: an accommodating space; 12: a first air outlet; 2: a gas cell; 21: a first air inlet; 23: a second air outlet; 24: a light inlet; 25: a light outlet; 26: a first mirror plate; 27: a second mirror; 3: an infrared spectrometer; 4: a vacuum pump; 41: a second air inlet; 5: an upper computer; 6: a first rubber hose; 7: a second rubber hose; 8: a barometer.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in FIG. 1, the farmland mulch volatile substance detection device is schematically shown to comprise a transparent container 1, a gas cell 2, an infrared spectrometer 3, a vacuum air pump 4 and an upper computer 5.
In the embodiment of the present application, a receiving space 11 for receiving a mulching film to be measured is formed inside the transparent container 1.
The gas cell 2 is communicated with the transparent container 1.
The infrared spectrometer 3 is sleeved on the periphery of the gas cell 2 and used for detecting the infrared spectrum of the gas released by the mulching film to be detected entering the gas cell 2 and the air mixture in the gas cell 2.
The vacuum pump 4 is communicated with the gas pool 2 and is used for pumping the gas in the gas pool 2.
The upper computer 5 is connected with the infrared spectrometer 3 and is used for fitting the spectral peak position and intensity in the infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substances in the spectral library so as to realize the detection of the volatile substances in the mulching film to be detected. Specifically, a mulching film to be detected is placed in a transparent container 1 and the transparent container 1 is sealed, a first air inlet valve on a gas cell 2 is closed, a second air outlet valve on the gas cell 2 is opened, the air pressure in the gas cell 2 is pumped to a negative value, the infrared spectrum of the air in the gas cell 2 at the moment is detected and is used as a reference spectrum, a second air outlet valve on the gas cell 2 is closed, the first air inlet valve on the gas cell 2 is opened, the gas volatilized from the mulching film to be detected in the transparent container 1 is pumped into the gas cell 2, when the air pressure in the gas cell 2 is recovered to a normal value (the pressure value is more than or equal to 0), the infrared spectrum of the gas and air mixture emitted from the mulching film to be detected in the gas cell 2 at the moment is detected and is used as a sample spectrum, the reference spectrum of the air is removed from the sample spectrum so as to obtain the, fitting the spectral peak position and intensity in the obtained infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substances in the NIST database so as to realize the infrared spectrum detection of the mulching film to be detected. It can be seen that the farmland plastic film volatile matter detection device of this application has the advantage that the harmful gas in the plastic film that awaits measuring is detected fast, accurately.
It should be noted that the "spectral library" is well known to those skilled in the art, and is not described in detail herein for the sake of brevity. Wherein the spectral library may be NIST spectral library.
In one embodiment of the present application, the upper computer 5 may be a computer.
It should be further noted that the structure and operation principle of the infrared spectrometer 3 are well known to those skilled in the art, and are not described in detail herein for the sake of brevity.
Preparation of experimental samples: cut 100cm2The mulching film to be tested in the farmland is placed in a 10L (liter) transparent container 1, the bottle mouth of the transparent container 1 is sealed by a sealing film, a first air outlet valve is closed, and the mulching film is kept stand for 2 hours at room temperature.
Opening the infrared spectrometer 3, and setting the spectral resolution to be 1cm after the working state of the infrared spectrometer 3 is normal-1The sample spectrum scanning times are 16, the reference spectrum scanning times are 16, and the spectrum wave number range is 4000cm-1～400cm-1The grating aperture size was 6mm (millimeters) and the scan speed was 10 kHz.
A10-meter long-optical-path gas pool 2 is used as a gas storage and measurement device for the release of the mulching film to be measured, a first gas inlet valve and a second gas outlet valve of the gas pool 2 are opened, a vacuum air pump 4 is started and works for 3-5 minutes, and gas in the gas pool 2 is exchanged. And opening the infrared spectrometer 3, pumping the air pressure in the gas cell 2 to 3inHg, closing the first air outlet valve and the second air inlet valve, measuring the infrared absorbance of the air at the moment to obtain a spectrogram, and taking the infrared spectrum as the reference spectrum for the detection. And opening a first air inlet valve at the gas cell 2, recovering the air pressure in the gas cell 2 to 1 atmospheric pressure state, closing the first air inlet valve, measuring the infrared absorbance of the air at the moment to obtain a spectrogram, and taking the spectrogram as a sample spectrum. And pumping the air pressure in the air pool 2 to 10inHg by using a vacuum air pump 4, connecting a first air outlet valve of the transparent container 1 storing the mulching film to be detected with a first air inlet valve of the air pool 2, pumping volatile gas generated by the mulching film to be detected stored in the transparent container 1 into the air pool 2, closing the first air inlet valve of the air pool 2 after the air pressure in the air pool 2 is restored to 1 atmospheric pressure state, and measuring a spectrogram obtained by measuring the infrared absorbance of the volatile gas released by the mulching film to be detected at the moment by using an infrared spectrometer 3 to serve as a sample spectrum.
Comparing the sample spectrum with a reference spectrum, e.g. at 1093cm-1、1046cm-1、966cm-1And (3) finding characteristic peaks which are contained in the sample spectrum and are different from the reference spectrum of the air at the equal wavenumber section, and comparing and contrasting the obtained characteristic peak data with the data of the gaseous infrared absorbance spectrogram of known substances in the NIST spectral library to obtain specific substance components contained in volatile gas generated by the sample mulching film.
As shown in fig. 1, in a preferred embodiment of the present application, the transparent container 1 comprises a glass can, a first air outlet 12 is formed at the bottom of the glass can, and a first air outlet valve (not shown) is installed at the first air outlet 12. Specifically, the glass jar has the non-light tight function, and after sunshine shines into the glass jar, can make the plastic film that awaits measuring volatilize and release gas, promptly, place this plastic film that awaits measuring in the glass jar, can arouse this plastic film that awaits measuring and can release gas as early as possible in the short time. Wherein, the first air outlet valve is used for controlling the opening and closing of the first air outlet 12 of the transparent container 1.
As shown in fig. 1, in a preferred embodiment of the present application, a first gas inlet 21 is formed at the top of the gas cell 2, the first gas inlet 21 is communicated with the first gas outlet 12 through a first rubber hose 6, wherein a first gas inlet valve (not shown) is mounted on the first gas inlet 21. Specifically, after first gas outlet valve and first air inlet valve all opened, alright realize the intercommunication of this transparent container 1 and gas cell 2, the gas that the plastic film that awaits measuring released just can enter into this gas cell 2 through this first rubber hose 6 in to be ready for subsequent infrared spectrum detection.
It should be noted that, after the mulching film to be detected is placed in the transparent container 1, the first air outlet valve is opened after the mulching film to be detected is still for 10 to 15 minutes, so that it can be ensured that more air is contained in the transparent container 1 for subsequent detection. It is understood that if the mass of the mulching film to be measured is large, the resting time can be appropriately shortened on the basis of the above time, and if the mass of the mulching film to be measured is small, the resting time can be appropriately lengthened on the basis of the above time.
As shown in fig. 1, in a preferred embodiment of the present application, a second gas outlet 23 is formed at the top of the gas cell 2, a second gas inlet 41 is formed on the vacuum pump 4, wherein the second gas outlet 23 is communicated with the second gas inlet 41 through a second rubber hose 7, a second gas outlet valve (not shown) is installed at the second gas outlet 23, and a second gas inlet valve (not shown) is installed at the second gas inlet 41. Specifically, through opening this second gas outlet valve and second air inlet valve to can realize this gaseous pond 2 and vacuum air pump 4's intercommunication, under this vacuum air pump 4's the effect of bleeding, become the negative value with the atmospheric pressure in the gaseous pond 2, promptly, make the inside formation negative pressure state of this gaseous pond 2, like this, after opening first gas outlet valve and first air inlet valve, under the effect of negative pressure, alright in order to take out the gas in the transparent container 1 in this gaseous pond 2.
As shown in fig. 1, in one embodiment of the present application, a gas pressure gauge 8 capable of detecting the pressure in the gas cell 2 in real time is provided on the gas cell 2. Specifically, the arrangement of the barometer 8 can detect the pressure in the gas pool 2 in real time, so that the explosion caused by overlarge negative pressure in the gas pool 2 is avoided, and therefore, the safety in the operation process is effectively guaranteed due to the arrangement of the barometer 8.
In a preferred embodiment of the present application, as shown in fig. 1, a through cavity is formed in the infrared spectrometer 3 for accommodating the gas cell 2, and a light inlet 24 and a light outlet 25 are formed in the gas cell 2 and corresponding to the infrared spectrometer 3.
In another preferred embodiment of the present application, a housing space is configured inside the gas cell 2, a first reflective mirror 26 is disposed at the bottom of the housing space, a second reflective mirror 27 is disposed at the top of the housing space, and infrared spectrum enters the interior of the gas cell 2 through the light inlet 24 and is emitted into the infrared spectrometer 3 through the light outlet 25 under multiple reflections of the first reflective mirror 26 and the second reflective mirror 27. The infrared radiation can repeatedly pass through the collected volatile gas by the reflection action of a group of reflectors in the gas cell 2, so as to achieve the purpose of increasing the optical path difference.
In a preferred embodiment of the present application, the gas cell 2 is made of a material comprising plexiglass. Namely, the gas cell 2 is a transparent body.
As shown in fig. 2, according to a second aspect of the present invention, there is also provided a method for detecting volatile substances in a farmland mulching film, comprising:
and step S1, placing the mulching film to be tested in the transparent container 1 and sealing the transparent container 1.
Step S2, close the first inlet valve on the gas cell 2, open the second outlet valve on the gas cell 2, pump the air pressure in the gas cell 2 to a negative value, detect the infrared spectrum of the air in the gas cell 2 at that time, and use the infrared spectrum as a reference spectrum.
And step S3, closing a second air outlet valve on the gas cell 2, opening a first air inlet valve on the gas cell 2, pumping the gas volatilized by the mulching film to be detected in the transparent container 1 into the gas cell 2, and detecting the infrared spectrum of the mixture of the gas volatilized by the mulching film to be detected in the gas cell 2 and the air at the moment and taking the infrared spectrum as a sample spectrum when the air pressure in the gas cell 2 is recovered to a normal value.
And step S4, removing the reference spectrum of the air from the sample spectrum to obtain the infrared spectrum of the mulching film to be detected.
And step S5, fitting the spectral peak position and intensity in the obtained infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substance in the spectral library to realize the infrared spectrum detection of the mulching film to be detected.
To sum up, a mulching film to be detected is placed in the transparent container 1 and the transparent container 1 is sealed, the first air inlet valve on the gas cell 2 is closed, the second air outlet valve on the gas cell 2 is opened, the air pressure in the gas cell 2 is pumped to a negative value, the infrared spectrum of the air in the gas cell 2 at the moment is detected and taken as a reference spectrum, the second air outlet valve on the gas cell 2 is closed, the first air inlet valve on the gas cell 2 is opened, the gas volatilized from the mulching film to be detected in the transparent container 1 is pumped into the gas cell 2, when the air pressure in the gas cell 2 is recovered to a normal value (the pressure value is more than or equal to 0), the infrared spectrum of the mixture of the gas and the air volatilized from the mulching film to be detected at the moment is detected and taken as a sample spectrum, and the reference spectrum of the air is removed from the sample spectrum to obtain the infrared spectrum of the, fitting the position and the intensity of the spectral peak in the obtained infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substance in the spectral library to realize the infrared spectrum detection of the mulching film to be detected. It can be seen that the farmland plastic film volatile matter detection device of this application has the advantage that the harmful gas in the plastic film that awaits measuring is detected fast, accurately.
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 (9)
1. The utility model provides a farmland plastic film volatile substance detection device which characterized in that includes:
the inner part of the transparent container is provided with an accommodating space for accommodating a mulching film to be detected;
the gas pool is communicated with the transparent container;
the infrared spectrometer is sleeved on the periphery of the gas cell and used for detecting the infrared spectrum of the gas released by the mulching film to be detected entering the gas cell and the air mixture in the gas cell;
the vacuum air pump is communicated with the gas pool and is used for pumping gas in the gas pool; and
and the upper computer is connected with the infrared spectrometer and is used for fitting the spectral peak position and intensity in the infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substances in the spectral library so as to realize detection of the volatile substances in the mulching film to be detected.
2. The farmland mulch volatile substance detection device of claim 1, wherein the transparent container comprises a glass tank, a first air outlet is configured at a bottom of the glass tank, and a first air outlet valve is installed at the first air outlet.
3. The farmland mulch volatile substance detection device of claim 2, wherein a first air inlet is configured at the top of the gas tank, the first air inlet being in communication with the first air outlet through a first rubber hose, wherein a first air inlet valve is mounted on the first air inlet.
4. The farmland mulch volatile substance detection device of claim 3, wherein a second gas outlet is configured at the top of the gas tank, and a second gas inlet is configured on the vacuum air pump, wherein the second gas outlet is communicated with the second gas inlet through a second rubber hose, a second gas outlet valve is installed at the second gas outlet, and a second gas inlet valve is installed at the second gas inlet.
5. The farmland mulch volatile substance detection device as claimed in any one of claims 1 to 4, wherein a gas pressure gauge capable of detecting the pressure in the gas tank in real time is provided on the gas tank.
6. The farmland mulch volatile substance detection device of claim 1, wherein the infrared spectrometer is configured with a through cavity capable of accommodating the gas cell, and the gas cell is configured with a light inlet and a light outlet corresponding to the infrared spectrometer.
7. The farmland mulch volatile substance detection device of claim 6, wherein a placement space is constructed inside the gas cell, a first reflector is arranged at the bottom of the placement space, a second reflector is arranged at the top of the placement space, and infrared spectrum enters the inside of the gas cell through the light inlet and is emitted into the infrared spectrometer through the light outlet under multiple reflections of the first reflector and the second reflector.
8. The farmland mulch volatile substance detection device of claim 1, wherein the gas cell is made of organic glass.
9. A farmland mulching film volatile matter detection method is characterized by comprising the following steps:
placing a mulching film to be detected in a transparent container and sealing the transparent container;
closing a first air inlet valve on the gas cell, opening a second air outlet valve on the gas cell, pumping the air pressure in the gas cell to be a negative value, detecting the infrared spectrum of the air in the gas cell at the moment, and taking the infrared spectrum as a reference spectrum;
closing a second air outlet valve on the gas cell, opening a first air inlet valve on the gas cell, pumping the gas volatilized by the mulching film to be detected in the transparent container into the gas cell, detecting the infrared spectrum of the mixture of the gas volatilized by the mulching film to be detected in the gas cell and the air at the moment when the air pressure in the gas cell is recovered to a normal value, and taking the infrared spectrum as a sample spectrum;
removing the reference spectrum of the air from the sample spectrum to obtain the infrared spectrum of the mulching film to be detected;
fitting the position and the intensity of the spectral peak in the obtained infrared spectrum of the mulching film to be detected with the infrared spectrum of the known substance in the spectral library to realize the infrared spectrum detection of the mulching film to be detected.
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Application publication date: 20200421 |