CN112729465A - Liquid detector - Google Patents
Liquid detector Download PDFInfo
- Publication number
- CN112729465A CN112729465A CN202110042048.9A CN202110042048A CN112729465A CN 112729465 A CN112729465 A CN 112729465A CN 202110042048 A CN202110042048 A CN 202110042048A CN 112729465 A CN112729465 A CN 112729465A
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- China
- Prior art keywords
- light
- main control
- control board
- pin
- sixteen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007788 liquid Substances 0.000 title claims abstract description 47
- 230000003321 amplification Effects 0.000 claims description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 18
- 240000007651 Rubus glaucus Species 0.000 claims description 9
- 235000011034 Rubus glaucus Nutrition 0.000 claims description 9
- 235000009122 Rubus idaeus Nutrition 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000002360 explosive Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 235000016795 Cola Nutrition 0.000 description 1
- 235000011824 Cola pachycarpa Nutrition 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Abstract
The invention discloses a liquid detector. Conventional detectors do not recognize the specific type of liquid. The invention comprises a sample advancing mechanism, a signal acquisition mechanism and a control mechanism. And a sample advancing mechanism, wherein an advancing motor drives the sliding table and the cuvette to move in the horizontal direction through a screw rod. In the signal acquisition mechanism, a light-emitting diode seat and a photoelectric diode seat are arranged on a horizontal table side by side, and sixteen light channels are respectively arranged on the light-emitting diode seat and the photoelectric diode seat side by side. The light emitting diode is arranged in the light channel of the light emitting electrode tube seat, the photodiode is arranged in the light channel of the photodiode tube seat, the peak values of the light emitting wavelengths of the sixteen light emitting diodes are different, and the light emitting diodes and the photodiode are connected with the main control board. The liquid spectrum acquisition method has the advantages of novel liquid spectrum acquisition mode, high identification accuracy and high speed, overcomes the defect that the traditional detector cannot identify the liquid type, has simple structure and principle, has low manufacturing cost, and is very suitable for application and popularization.
Description
Technical Field
The invention belongs to the technical field of detection, and relates to a liquid detector.
Background
In order to ensure safety, liquid detectors are equipped in airports, high-speed rail stations, subway stations and other places to detect whether liquid exists in articles carried by passengers. The liquid detector is a security inspection instrument specially used for detecting flammable and explosive liquids. At present, the principle of the most widely used liquid detector in China is quasi-static electrical tomography, which is called quasi-static computed tomography for short, and whether the liquid to be detected is inflammable and explosive is judged by measuring the dielectric constant and the conductivity of the liquid to be detected. The dielectric constant and the conductivity of the safe liquid and the dangerous liquid are greatly different, so that the dangerous liquid can be identified by the method. The detector can distinguish flammable and explosive liquids such as liquid explosives, gasoline, acetone and ethanol from safe liquids such as water, cola, milk and fruit juice without directly contacting the liquids, but cannot detect specific types of the liquids. Although the method can be used for identifying the liquid, it is difficult to judge the type of the liquid if a user wants to go further. Moreover, the liquid detectors are generally high in cost and expensive, and one device is tens of thousands of times.
Disclosure of Invention
The invention aims to provide a liquid detector aiming at the defects of the prior art.
The invention comprises a sample advancing mechanism, a signal acquisition mechanism and a control mechanism.
The sample advancing mechanism comprises an advancing motor, a screw rod, a sliding table and a cuvette; one end of the screw rod is connected with the power output end of the advancing motor, the screw rod is connected with the sliding table in a matching way, and the cuvette is arranged on the sliding table; the cuvette is a container with a transparent side wall; the advancing motor drives the sliding table and the cuvette to move in the horizontal direction through the screw rod.
The signal acquisition mechanism comprises a horizontal table, a light-emitting diode base and a photoelectric diode base; the horizontal table is arranged above the screw rod, the light-emitting diode seat and the photodiode seat are arranged on the horizontal table, and sixteen light channels are respectively arranged on the light-emitting diode seat and the photodiode seat in parallel; the optical channel is a through hole, and the hole opening direction is vertical to the moving direction of the sliding table; the light channels of the light-emitting electrode tube seat and the light channels of the photodiode tube seat are in one-to-one correspondence on a straight line; the light channel of the light-emitting electrode tube seat is internally provided with a light-emitting diode, and the light channel of the photodiode tube seat is internally provided with a photodiode.
The peak values of the light emitting wavelengths of the sixteen light emitting diodes are different and are divided into four groups, and the four photodiodes in each group are connected with corresponding signal amplifying circuits; each signal amplifying circuit comprises an amplifying chip and four variable resistors; the amplifying chip is provided with four positive input pins, four negative input pins and four output pins; the positive electrode of each photodiode is connected with the positive input pin corresponding to the amplification chip, the negative electrode of each photodiode is connected with the negative input pin corresponding to the amplification chip, and the negative input pin is connected with the output pin of the amplification chip through an adjustable resistor; the power pin of the amplifying chip is connected with a 24V power supply, and the four positive input pins and the grounding pin are grounded.
The control mechanism comprises a main control board, a motor driving chip, a liquid crystal screen and a raspberry pie.
The main control board is at least provided with sixteen signal input pins and sixteen control pins, four output pins of each amplification chip are connected with the sixteen signal input pins of the main control board, anodes of the sixteen light-emitting diodes are respectively connected with the sixteen control pins of the main control board through corresponding resistors, and cathodes of the sixteen light-emitting diodes are grounded.
The four driving signal output ends of the motor driving chip are connected with the traveling motor, a power supply pin of the motor driving chip is connected with a power supply output pin of the main control board, a pulse signal input pin is connected with the pulse signal output pin of the main control board, a direction signal input pin is connected with the direction signal output pin of the main control board, and an enable control pin is connected with an enable signal output pin of the main control board.
The power input pin and the multimedia signal input pin of the liquid crystal screen are respectively connected with the power output pin and the multimedia signal output pin of the raspberry pi, and the raspberry pi is connected with the main control board through the USB interface and receives signals of the main control board or sends signals to the main control board.
Furthermore, at least twelve of the sixteen light-emitting diodes emit visible light with a wavelength peak value of 380 nm-780 nm.
Further, the amplifying chip adopts an LM324N quad-operational amplifier amplifying chip.
Furthermore, the main control board adopts a singlechip Arduino MEGA 2560.
Further, the motor driver chip adopts a motor driver M420B.
The method for acquiring the liquid spectrum is novel, has high identification accuracy and high speed, and overcomes the defect that the traditional detector cannot identify the liquid type. The invention has simple structure and principle and low manufacturing cost, and is very suitable for application and popularization.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a sample advancing mechanism;
FIG. 3 is a schematic structural view of a signal acquisition mechanism;
FIG. 4 is a schematic wavelength diagram of an LED in an embodiment;
FIG. 5 is a schematic view of a steering mechanism;
FIG. 6 is a waveform of ethanol as the test liquid;
figure 7 is a waveform of sodium hydroxide as the test liquid.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
As shown in fig. 1, a liquid detector includes a sample advancing mechanism 1, a signal collecting mechanism 2, and a manipulation mechanism.
As shown in fig. 2, the sample travel mechanism 1 includes a travel motor (not shown), a screw 11, a slide table 12, and a cuvette 13. 11 one end of lead screw is connected with the power take off end of the motor of marcing, and lead screw 11 is connected with the cooperation of slip table 12, and on slip table 12 was arranged in to cell 13, cell 13 was the transparent container of lateral wall. The screw rod 11 is driven by the traveling motor to rotate, so that the sliding table 12 and the cuvette 13 are driven to move in the horizontal direction.
As shown in fig. 3, the signal acquisition mechanism 2 includes a horizontal stage 21, a light emitting diode holder 22, and a photodiode holder 23. The horizontal table 21 is arranged above the screw rod 11, the light emitting diode seat 22 and the photodiode seat 23 are arranged on the horizontal table 21, sixteen light channels are respectively arranged on the light emitting diode seat 22 and the photodiode seat 23 side by side, the light channels are through holes, and the direction of the holes is perpendicular to the moving direction of the sliding table 12. The light channels of the light emitting diode base 22 and the light channels of the photodiode base 23 are in one-to-one correspondence on a straight line, so that stable emission and receiving of monochromatic light are ensured. The light channels of the light emitting diode base 22 are respectively provided with light emitting diodes (not shown in the figure), the light channels of the photodiode base 23 are respectively provided with photodiodes (not shown in the figure), and visible light emitted by each light emitting diode is received by the corresponding photodiode to form sixteen parallel light paths. When the cuvette 13 moves horizontally, sixteen optical paths pass through the cuvette 13 in sequence.
The sixteen light-emitting diodes have different light-emitting wavelength peak values, wherein at least twelve of the light-emitting diodes emit visible light with the wavelength peak value of 380 nm-780 nm. As shown in fig. 4, the sixteen light emitting diodes LED 1-LED 16 in this embodiment emit light with wavelength peaks of 370.7nm, 425.3nm, 446.6nm, 459.6nm, 513.5nm, 592.3nm, 636.0nm, 850.5nm, 399.3nm, 430.2nm, 454.3nm, 470.5nm, 561.2nm, 610.3nm, 660.0nm and 940.0nm, which are commercially available and have relatively large wavelength peaks in the market. As shown in fig. 5, sixteen photodiodes are divided into four groups, and the four photodiodes PD1 to PD 4in each group are connected to corresponding signal amplification circuits. Each signal amplification circuit includes one amplification chip U1 and four variable resistors Rf1 to Rf 4. The amplifying chip U1 adopts LM324N four-operational amplifying chip, which has four positive input pins 1IN + 4IN +, four negative input pins 1 IN-4 IN-and four output pins 1 OUT-40 UT. The anode of each photodiode is connected with a positive input pin IN + corresponding to the amplification chip U1, the cathode of each photodiode is connected with a negative input pin IN-corresponding to the amplification chip U1, the anode of each photodiode is connected with an output pin OUT of the amplification chip through an adjustable resistor, a power supply pin VCC of the amplification chip is connected with a 24V power supply, and the four positive input pins IN + and a grounding pin GND are grounded.
As shown in fig. 5, the control mechanism includes a main control board U2, a motor driving chip U3, a liquid crystal display L, and a raspberry pi.
The main control board U2 adopts a singlechip Arduino MEGA 2560, four output pins 1 OUT-40 UT (sixteen in total) of each amplification chip U1 are connected with sixteen signal input pins of the main control board, anodes of sixteen Light Emitting Diodes (LEDs) are respectively connected with sixteen control pins of the main control board U2 through corresponding resistors R, and cathodes of the sixteen light emitting diodes are grounded.
The motor driving chip U3 adopts a motor driver M420B, four driving signal output ends of a motor driving chip U3 are connected with a traveling motor D, a power supply pin of the motor driving chip U3 is connected with a power supply output pin VC of a main control board U2, a pulse signal input pin PUL is connected with a pulse signal output pin of the main control board U2, a direction signal input pin DIR is connected with a direction signal output pin of the main control board U2, and an enable control pin ENA is connected with an enable signal output pin of the main control board U2. The main control board U2 controls the rotation and the rotation direction of the travel motor D through the motor driving chip U3.
The power input pin and the multimedia signal input pin of the liquid crystal display L are respectively connected with the power output pin and the multimedia signal output pin of the raspberry pi, and the raspberry pi is connected with the main control board U2 through a USB interface to receive signals of the main control board or send signals to the main control board.
Firstly, calibration is carried out according to the known liquid, and after the monochromatic light emitted by each light emitting diode passes through the known liquid, the voltage generated by the corresponding photodiode is calibrated. The liquid to be measured is placed in the cuvette 13 and the travel motor and the photodiode are turned on. The cuvette 13 sequentially passes through sixteen light-emitting diodes, monochromatic light with different wavelengths emitted by the light-emitting diodes passes through liquid to be detected and is received by the photodiodes to generate current signals, and the current signals are converted into voltage signals and amplified after passing through the signal amplification circuit and are received by the main control panel. According to the intensity of the voltage signal and the corresponding photodiode, the type of the liquid to be measured can be determined by referring to the calibrated known liquid.
Fig. 6 is a schematic diagram showing a relationship between a wavelength of a light emitting diode in which a test liquid is ethanol and an output voltage, and fig. 7 is a schematic diagram showing a relationship between a wavelength of a light emitting diode in which a test liquid is sodium hydroxide and an output voltage. As can be seen from FIGS. 6 and 7, different liquids have different waveforms, and the type of the liquid to be detected can be clearly obtained by detecting with the instrument.
Claims (5)
1. The utility model provides a liquid detector, includes sample travel mechanism, signal acquisition mechanism and controls the mechanism, its characterized in that:
the sample advancing mechanism comprises an advancing motor, a screw rod, a sliding table and a cuvette; one end of the screw rod is connected with the power output end of the advancing motor, the screw rod is connected with the sliding table in a matching way, and the cuvette is arranged on the sliding table; the cuvette is a container with a transparent side wall; the advancing motor drives the sliding table and the cuvette to move in the horizontal direction through the screw rod;
the signal acquisition mechanism comprises a horizontal table, a light-emitting diode base and a photoelectric diode base; the horizontal table is arranged above the screw rod, the light-emitting diode seat and the photodiode seat are arranged on the horizontal table, and sixteen light channels are respectively arranged on the light-emitting diode seat and the photodiode seat in parallel; the optical channel is a through hole, and the hole opening direction is vertical to the moving direction of the sliding table; the light channels of the light-emitting electrode tube seat and the light channels of the photodiode tube seat are in one-to-one correspondence on a straight line; a light emitting diode is arranged in the light channel of the light emitting electrode tube seat, and a photodiode is arranged in the light channel of the photodiode tube seat;
the peak values of the light emitting wavelengths of the sixteen light emitting diodes are different and are divided into four groups, and the four photodiodes in each group are connected with corresponding signal amplifying circuits; each signal amplifying circuit comprises an amplifying chip and four variable resistors; the amplifying chip is provided with four positive input pins, four negative input pins and four output pins; the positive electrode of each photodiode is connected with the positive input pin corresponding to the amplification chip, the negative electrode of each photodiode is connected with the negative input pin corresponding to the amplification chip, and the negative input pin is connected with the output pin of the amplification chip through an adjustable resistor; the power supply pin of the amplification chip is connected with a 24V power supply, and the four positive input pins and the grounding pin are grounded;
the control mechanism comprises a main control board, a motor driving chip, a liquid crystal screen and a raspberry pie;
the main control board is at least provided with sixteen signal input pins and sixteen control pins, four output pins of each amplification chip are connected with the sixteen signal input pins of the main control board, anodes of the sixteen light-emitting diodes are respectively connected with the sixteen control pins of the main control board through corresponding resistors, and cathodes of the sixteen light-emitting diodes are grounded;
the four driving signal output ends of the motor driving chip are connected with the traveling motor, a power supply pin of the motor driving chip is connected with a power supply output pin of the main control board, a pulse signal input pin is connected with a pulse signal output pin of the main control board, a direction signal input pin is connected with a direction signal output pin of the main control board, and an enable control pin is connected with an enable signal output pin of the main control board;
the power input pin and the multimedia signal input pin of the liquid crystal screen are respectively connected with the power output pin and the multimedia signal output pin of the raspberry pi, and the raspberry pi is connected with the main control board through the USB interface and receives signals of the main control board or sends signals to the main control board.
2. A liquid detector as claimed in claim 1, wherein: at least twelve of the sixteen light-emitting diodes emit visible light with a wavelength peak value of 380 nm-780 nm.
3. A liquid detector as claimed in claim 1, wherein: the amplifying chip adopts an LM324N quad-operational amplifier amplifying chip.
4. A liquid detector as claimed in claim 1, wherein: the main control board adopts a singlechip Arduino MEGA 2560.
5. A liquid detector as claimed in claim 1, wherein: the motor driving chip adopts a motor driver M420B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110042048.9A CN112729465B (en) | 2021-01-13 | Liquid detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110042048.9A CN112729465B (en) | 2021-01-13 | Liquid detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112729465A true CN112729465A (en) | 2021-04-30 |
| CN112729465B CN112729465B (en) | 2024-05-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1424823A (en) * | 1972-02-08 | 1976-02-11 | Kiess Instr Inc | Apparaut sor measuring constituent concentrations in a sample by ab apparatus for measuring constituent concentrations in a sample by absorption photometry |
| RU2413201C1 (en) * | 2009-12-15 | 2011-02-27 | Государственное образовательное учреждение высшего профессионального образования "Сибирская государственная геодезическая академия" (ГОУВПО "СГГА") | Optoelectronic photocolorimetre |
| CN202631420U (en) * | 2012-05-31 | 2012-12-26 | 无锡创晨科技有限公司 | Photoelectric detection circuit of heavy metal online monitor |
| CN205940583U (en) * | 2016-07-25 | 2017-02-08 | 浙江威星智能仪表股份有限公司 | Photoelectricity transmit -receive tube drive circuit |
| CN111693497A (en) * | 2020-05-15 | 2020-09-22 | 核工业北京化工冶金研究院 | Portable aquatic uranium detector |
| CN213812488U (en) * | 2021-01-13 | 2021-07-27 | 杭州师范大学 | Photoelectric liquid detector |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1424823A (en) * | 1972-02-08 | 1976-02-11 | Kiess Instr Inc | Apparaut sor measuring constituent concentrations in a sample by ab apparatus for measuring constituent concentrations in a sample by absorption photometry |
| RU2413201C1 (en) * | 2009-12-15 | 2011-02-27 | Государственное образовательное учреждение высшего профессионального образования "Сибирская государственная геодезическая академия" (ГОУВПО "СГГА") | Optoelectronic photocolorimetre |
| CN202631420U (en) * | 2012-05-31 | 2012-12-26 | 无锡创晨科技有限公司 | Photoelectric detection circuit of heavy metal online monitor |
| CN205940583U (en) * | 2016-07-25 | 2017-02-08 | 浙江威星智能仪表股份有限公司 | Photoelectricity transmit -receive tube drive circuit |
| CN111693497A (en) * | 2020-05-15 | 2020-09-22 | 核工业北京化工冶金研究院 | Portable aquatic uranium detector |
| CN213812488U (en) * | 2021-01-13 | 2021-07-27 | 杭州师范大学 | Photoelectric liquid detector |
Non-Patent Citations (2)
| Title |
|---|
| 伟利国 等: "粮食烘干过程中水分在线检测系统研究", 电子产品世界, 31 December 2014 (2014-12-31) * |
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