CN110346650A - The taper capacitance detecting device of micro- plastics in a kind of detection water - Google Patents
The taper capacitance detecting device of micro- plastics in a kind of detection water Download PDFInfo
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- CN110346650A CN110346650A CN201910627368.3A CN201910627368A CN110346650A CN 110346650 A CN110346650 A CN 110346650A CN 201910627368 A CN201910627368 A CN 201910627368A CN 110346650 A CN110346650 A CN 110346650A
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- taper
- micro
- detection
- plastics
- capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention belongs to detect micro- plastics arts in water, disclose a kind of taper capacitance detecting device for detecting micro- plastics in water, it include: micro-fluidic detection chip, the taper capacitance detection unit in insertion micro-fluidic detection chip, exciting unit, exciting unit connects taper capacitance detection unit by insulated conductor；Taper capacitance detection unit includes the identical taper capacitor plate of two structures, and two taper capacitor plate faces are arranged, and the microchannel in micro-fluidic detection chip passes through among two taper capacitor plates, and is close to microchannel.By exciting unit to taper capacitor plate with high-frequency ac electric excitation, when micro- plastic grain in water passes through taper capacitor plate, since the relative dielectric constant of water is greater than the relative dielectric constant of micro- plastics, the capacitance signal pulse of negative sense will be generated, the size and shape of micro- plastics is judged according to the amplitude size and frequency of the signal pulse of generation.Solve the prior art detection speed it is slow, detection accuracy is low, the problem of detection device complexity.
Description
Technical field
The present invention relates to micro- plastics arts in detection water, specifically, more particularly to a kind of micro- plastics in detection water
Taper capacitance detecting device.
Background technique
Plastics are the chief components of the water area refuses such as ocean, river, account for about the 60%~80% of rubbish total amount, at certain
A little areas even up to 90%~95%, and with the trend growth of average annual growth.It is reported that the plastics that the whole world produces every year are super
300,000,000 tons are crossed, wherein ocean, river etc. can be entered there are about 10% plastics, but in fact, every piece of plastic consumed by us
It is finally likely to enter these waters.Micro- plastics refer to partial size less than 5 ㎜, and greater than 0.1 μm plastic flakes, fiber or
Particle.Micro- plastic pollution problem has been global hot issue in the waters such as ocean.According to investigation, Mediterranean sea area
In plastic pollution mainly due to travelling caused by also equal mankind's activities, micro- plastics have been distributed to earth's surface, underground water and
In marine organisms body.Currently, having much for the determination method of micro- plastic grain in the world.Mesh is analyzed using common instrument
Inspection method is one of most basic method, but its error is larger, is suitble to some large-sized micro- plastic grains.
Summary of the invention
Slow according to the micro- plastics detection speed of tradition set forth above, detection accuracy is low, the technical problems such as detection device complexity,
And provide a kind of taper capacitance detecting device for detecting micro- plastics in water.Present invention is primarily based in micro-fluid chip detection technique
Granule counting method, devises a kind of condenser type micro-fluid chip, and the accurate of micro- plastic grain in test sample may be implemented in chip
It counts and measures, the status information of institute's sample is obtained by detection data.
The technological means that the present invention uses is as follows:
The taper capacitance detecting device of micro- plastics in a kind of detection water, comprising: micro-fluidic detection chip, the micro-fluidic inspection of insertion
Taper capacitance detection unit, the exciting unit in chip are surveyed, the exciting unit connects the taper capacitor by insulated conductor
Detection unit.
Further, the micro-fluidic detection chip includes the chip body of substrate of glass and setting on the glass substrate；
The chip body includes:
The one end being arranged in chip body is provided with sample inlet, the other end be provided with sample export microchannel and
Taper capacitance detection unit.
Further, the taper capacitance detection unit includes the identical taper capacitor plate of two structures, and two are bored
The arrangement of shape capacitor plate face.
Further, the microchannel in the micro-fluidic detection chip passes through among two taper capacitor plates, and tight
Paste the microchannel.
Further, the microchannel diameter is 100-300 microns.
Further, the distance between the two described taper capacitor plates are 100-300 microns；Two tapers
The diameter of capacitor plate is 100-300 microns.
The present invention also provides a kind of production method of micro-fluidic detection chip, the production method is based on micro- in detection water
Micro-fluidic detection chip in the taper capacitance detecting device of plastics, and the following steps are included:
S1: microchannel mold and two taper capacitor plates is fixed on the glass substrate by set position；
S2: to substrate of glass perfusion model material, the external two enamel-cover leads arrangement of two of them taper capacitor plate
Outside cast material, it is poured it by cast material；
S3: will pour the micro-fluidic detection chip for being poured in cast material and place temperature baking 1 hour with 80 DEG C in an oven,
Solidify cast material；
S4: microchannel mold is extracted out from the cast material after solidification, with punch in microchannel punching two ends, is formed
Sample inlet and sample export.
Compared with the prior art, the invention has the following advantages that
1, taper capacitance detecting device provided by the invention is small, and production is simple, low in cost, easy to operate.
2, taper capacitance detecting device detection accuracy provided by the invention is high, accurate metering and can measure size.
3, taper capacitance detecting device detection cycle provided by the invention is fast, can be realized quickly dividing to micro- plastic grain
Analysis detection.
The present invention can be widely popularized in the fields such as micro- plastics in detection water based on the above reasons.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is structure of the detecting device block diagram of the present invention.
Fig. 2 is structure diagram of detection device of the present invention.
Fig. 3 is taper capacitance detection unit schematic diagram of the present invention.
Fig. 4 is detection device system block diagram of the present invention.
Fig. 5, which is the distance between two taper capacitor plates provided in an embodiment of the present invention, detects 15-30 when being 300 microns
The micro- plastic grain signal graph of micron.
Fig. 6, which is the distance between two taper capacitor plates provided in an embodiment of the present invention, detects 15-30 when being 200 microns
The micro- plastic grain signal graph of micron.
Fig. 7, which is the distance between two taper capacitor plates provided in an embodiment of the present invention, detects 15-30 when being 100 microns
The micro- plastic grain signal graph of micron.
In figure: 1, micro-fluidic detection chip；11, sample inlet；12, microchannel；13, sample export；14, cast material；
15, substrate of glass；2, taper capacitance detection unit；21, taper capacitor plate；3, exciting unit；4, micro- plastic grain；5,LCR
Chronograph watch；6, computer；7, microscope.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.It is real to the description of at least one exemplary embodiment below
It is merely illustrative on border, never as to the present invention and its application or any restrictions used.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be clear that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.Technology known for person of ordinary skill in the relevant, side
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, appointing should be construed as merely illustratively to occurrence, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
In the description of the present invention, it is to be understood that, the noun of locality such as " front, rear, top, and bottom, left and right ", " it is laterally, vertical,
Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes
System, is merely for convenience of description of the present invention and simplification of the description, in the absence of explanation to the contrary, these nouns of locality do not indicate that
It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage
Solution is limiting the scope of the invention: the noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under its device or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for
Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this
The limitation of invention protection scope.
As shown in Figure 1, the present invention provides a kind of taper capacitance detecting devices of micro- plastics in detection water, comprising: miniflow
Detection chip, the taper capacitance detection unit in insertion micro-fluidic detection chip, exciting unit are controlled, exciting unit is led by insulation
Line connects taper capacitance detection unit.By exciting unit to taper capacitor plate with high-frequency alternating current (1-2V, 0.1-2MHz)
Excitation, when micro- plastic grain in water passes through taper capacitor plate, since the relative dielectric constant of water is greater than the phase of micro- plastics
To dielectric constant, the capacitance signal pulse of negative sense will be generated, we sentence according to the amplitude size and frequency of the signal pulse of generation
Break the size and shapes of micro- plastics.
Specifically, as shown in Fig. 2, micro-fluidic detection chip includes the chip master of substrate of glass and setting on the glass substrate
Body；The chip body includes: that the one end being arranged in chip body is provided with sample inlet, the other end is provided with sample export
Microchannel and taper capacitance detection unit.Taper capacitance detection unit includes the identical taper capacitor plate of two structures,
And two taper capacitor plate face arrangements, taper capacitor plate are process using copper rod.As shown in figure 3, micro-fluidic detection
Microchannel in chip passes through among two taper capacitor plates, and is close to microchannel.Two taper capacitor plate one end connect
LCR chronograph watch is connect, the other end connects microscope.Wherein, microchannel diameter is 100-300 microns.Two taper capacitor plates
Diameter is 100-300 microns.The distance between two taper capacitor plates are 100-300 microns.
Specifically, as shown in figure 4, micro- plastic grain first passes through sample inlet driving when detecting micro- plastic grain in water
Into detection device, taper capacitor plate is flowed through via microchannel, finally again by microchannel to sample export, taper capacitance pole
Plate is connected with LCR chronograph watch, and LCR chronograph watch provides driving voltage and frequency, finally reads data, while capacitance pole in computer
The case where plate is connect with microscope, observes inside microchannels plastic grain at any time.
Specifically, the production method is based on inspection the present invention also provides a kind of production method of micro-fluidic detection chip
Micro-fluidic detection chip in survey water in the taper capacitance detecting device of micro- plastics, and the following steps are included:
S1: microchannel mold and two taper capacitor plates is fixed on the glass substrate by set position；
S2: to substrate of glass perfusion model material, the external two enamel-cover leads arrangement of two of them taper capacitor plate
Outside cast material, it is poured it by cast material；
S3: will pour the micro-fluidic detection chip for being poured in cast material and place temperature baking 1 hour with 80 DEG C in an oven,
Solidify cast material；
S4: microchannel mold is extracted out from the cast material after solidification, with punch in microchannel punching two ends, is formed
Sample inlet and sample export.
Embodiment 1
The present embodiment uses the taper capacitance detecting for setting 300 microns for the distance between two taper capacitor plates to fill
It sets, exciting unit connects the taper capacitance detection unit in insertion micro-fluidic detection chip by insulated conductor.Micro-fluidic detection
Detection microchannel in chip passes through among two taper capacitor plates, and is close to microchannel.Detect micro- plastics in water
When grain, micro- plastic grain first passes through sample inlet and is driven into detection device, flows through taper capacitor plate via microchannel, finally
Again by microchannel to sample export, taper capacitor plate is connected with LCR chronograph watch, and LCR chronograph watch provides driving voltage and frequency
Rate finally reads data in computer, while capacitor plate is connect with microscope, observes inside microchannels plastic grain at any time
Situation.As shown in figure 5, detecting 15-30 microns of micro- plastics when the distance between two taper capacitor plates are set as 300 microns
The signal graph of particle.
Embodiment 2
It will be between two taper capacitor plates this embodiment differs from embodiment 1 in that being used in the present embodiment
Distance is set as 200 microns of taper capacitance detecting device, and exciting unit connects insertion micro-fluidic detection core by insulated conductor
Taper capacitance detection unit in piece.It is worn among two taper capacitor plates detection microchannel in micro-fluidic detection chip
It crosses, and is close to microchannel.When detecting micro- plastic grain in water, micro- plastic grain first passes through sample inlet and is driven into detection dress
It sets, flows through taper capacitor plate via microchannel, finally again by microchannel to sample export, taper capacitor plate and LCR essence
Close table is connected, and LCR chronograph watch provides driving voltage and frequency, finally reads data in computer, at the same capacitor plate with it is micro-
Mirror connection, at any time the case where observation inside microchannels plastic grain.As shown in fig. 6, when between two taper capacitor plates away from
From the signal graph for detecting 15-30 microns of micro- plastic grains when being set as 200 microns.
Embodiment 3
It will be between two taper capacitor plates this embodiment differs from embodiment 1 in that being used in the present embodiment
Distance is set as 200 microns of taper capacitance detecting device, and exciting unit connects insertion micro-fluidic detection core by insulated conductor
Taper capacitance detection unit in piece.It is worn among two taper capacitor plates detection microchannel in micro-fluidic detection chip
It crosses, and is close to microchannel.When detecting micro- plastic grain in water, micro- plastic grain first passes through sample inlet and is driven into detection dress
It sets, flows through taper capacitor plate via microchannel, finally again by microchannel to sample export, taper capacitor plate and LCR essence
Close table is connected, and LCR chronograph watch provides driving voltage and frequency, finally reads data in computer, at the same capacitor plate with it is micro-
Mirror connection, at any time the case where observation inside microchannels plastic grain.As shown in fig. 7, when between two taper capacitor plates away from
From the signal graph for detecting 15-30 microns of micro- plastic grains when being set as 100 microns.
Table 1 is the corresponding micro- plastic grain detected signal value of difference of distance between two taper capacitor plates, is shown in table 1
Show, when distance is 300 microns between two taper capacitor plates, detected signal value is 7.254 × 10-11.When two tapers
When distance is 200 microns between capacitor plate, detected signal value is 1.198 × 10-10.When between two taper capacitor plates
When distance is 100 microns, detected signal value is 1.714 × 10-10。
Table 1
| Microchannel diameter (micron) | Signal value | Corresponding diagram |
| 300 | 7.254×10-11 | Fig. 5 |
| 200 | 1.198×10-10 | Fig. 6 |
| 100 | 1.714×10-10 | Fig. 7 |
It follows that two taper capacitor plates are embedded into micro-fluidic chip, Jie of micro- plastic grain and water is utilized
The difference of electric constant is detected.The accurate metering of micro- plastic grain and measurement in test sample may be implemented, pass through testing number
The status information of sample according to obtaining.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
1. the taper capacitance detecting device of micro- plastics in a kind of detection water characterized by comprising micro-fluidic detection chip, embedding
Enter taper capacitance detection unit, the exciting unit in micro-fluidic detection chip, the exciting unit connects institute by insulated conductor
State taper capacitance detection unit.
2. the taper capacitance detecting device of micro- plastics in detection water according to claim 1, which is characterized in that the miniflow
Control detection chip includes the chip body of substrate of glass and setting on the glass substrate；The chip body includes:
The one end being arranged in chip body is provided with sample inlet, the other end is provided with microchannel and the taper of sample export
Capacitance detection unit.
3. the taper capacitance detecting device of micro- plastics in detection water according to claim 1 or 2, which is characterized in that described
Taper capacitance detection unit includes the identical taper capacitor plate of two structures, and two taper capacitor plate faces are arranged.
4. the taper capacitance detecting device of micro- plastics in detection water according to claim 1 or 2, which is characterized in that described
Microchannel in micro-fluidic detection chip passes through among two taper capacitor plates, and is close to the microchannel.
5. the taper capacitance detecting device of micro- plastics in detection water according to claim 2, which is characterized in that described is micro-
Channel diameter is 100-300 microns.
6. the taper capacitance detecting device of micro- plastics in detection water according to claim 3, which is characterized in that described two
The distance between a taper capacitor plate is 100-300 microns；The diameter of two taper capacitor plates is 100-300
Micron.
7. the taper capacitance detecting device of micro- plastics in detection water according to claim 3, which is characterized in that described two
A taper capacitor plate one end connects LCR chronograph watch, and the other end connects microscope.
8. a kind of production method of micro-fluidic detection chip, which is characterized in that the production method is based on described in claim 1
Micro-fluidic detection chip, and the following steps are included:
S1: microchannel mold and two taper capacitor plates is fixed on the glass substrate by set position；
S2: to substrate of glass perfusion model material, two external enamel-cover leads of two of them taper capacitor plate are arranged in mould
Type material outer, is poured it by cast material；
S3: the micro-fluidic detection chip for being poured in cast material will be poured and place temperature baking 1 hour with 80 DEG C in an oven, make mould
Type material solidification；
S4: microchannel mold is extracted out from the cast material after solidification, with punch in microchannel punching two ends, forms sample
Entrance and sample export.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910627368.3A CN110346650A (en) | 2019-07-12 | 2019-07-12 | The taper capacitance detecting device of micro- plastics in a kind of detection water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910627368.3A CN110346650A (en) | 2019-07-12 | 2019-07-12 | The taper capacitance detecting device of micro- plastics in a kind of detection water |
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| CN110346650A true CN110346650A (en) | 2019-10-18 |
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Citations (5)
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|---|---|---|---|---|
| CN102043082A (en) * | 2010-10-26 | 2011-05-04 | 西安交通大学 | Conical capacitive transducer |
| CN103837773A (en) * | 2014-03-14 | 2014-06-04 | 云南电力试验研究院（集团）有限公司电力研究院 | Oscilloscope near-end measuring system for optical fiber transmission control signals |
| CN108426926A (en) * | 2018-03-12 | 2018-08-21 | 中国科学院生态环境研究中心 | A kind of device that based on dielectric loss angle tangent micro- plastics are detected with identification |
| CN108445050A (en) * | 2018-03-12 | 2018-08-24 | 中国科学院生态环境研究中心 | A kind of micro- plastics detection device based on dielectric constant identification |
| CN109283120A (en) * | 2018-11-08 | 2019-01-29 | 大连海事大学 | A kind of three-winding oil liquid detection device and preparation method thereof |
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2019
- 2019-07-12 CN CN201910627368.3A patent/CN110346650A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043082A (en) * | 2010-10-26 | 2011-05-04 | 西安交通大学 | Conical capacitive transducer |
| CN103837773A (en) * | 2014-03-14 | 2014-06-04 | 云南电力试验研究院（集团）有限公司电力研究院 | Oscilloscope near-end measuring system for optical fiber transmission control signals |
| CN108426926A (en) * | 2018-03-12 | 2018-08-21 | 中国科学院生态环境研究中心 | A kind of device that based on dielectric loss angle tangent micro- plastics are detected with identification |
| CN108445050A (en) * | 2018-03-12 | 2018-08-24 | 中国科学院生态环境研究中心 | A kind of micro- plastics detection device based on dielectric constant identification |
| CN109283120A (en) * | 2018-11-08 | 2019-01-29 | 大连海事大学 | A kind of three-winding oil liquid detection device and preparation method thereof |
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