CN113884448A - Device and method for detecting concentration of total soluble solids and hydrogen ions in water - Google Patents
Device and method for detecting concentration of total soluble solids and hydrogen ions in water Download PDFInfo
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Abstract
The invention discloses a device for detecting the concentration of total soluble solids and hydrogen ions in water, which comprises a transparent shell, a lens support and a main board, wherein the main board is respectively connected with a light source module, a spectrum receiving module and two probes; the detection device and the detection method can simultaneously detect the content of organic matters and inorganic matters in water and simultaneously quickly detect the content of hydrogen ions in the water, have the characteristics of quickness and convenience of an electrode method, are suitable for quickly detecting the total soluble solids of various water bodies such as municipal tap water, water source ground water, surface water, sewage and the like, are simple, convenient and quick, have strong universality and have higher detection precision.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a device and a method for detecting the concentration of total soluble solids and hydrogen ions in water.
Background
Total Dissolved Solids (TDS), also known as Total dissolved solids, refers to the Total solute content of the water, including both organic and inorganic materials. The inorganic substances generally include two kinds, one is salts dissolved in water and ionized into ions, and the other is inorganic substances which may exist in molecular state.
As known in the sanitary Standard for Drinking Water (GB5749-2006) issued in China, drinking water (drinking water), namely drinking water and domestic water for people to live, has the specified TDS limit requirement: the total amount of soluble solid is less than or equal to 1000 mg/L. Small central water supply for road areas in rural areas, representing a centralized water supply in rural areas with daily water supply below 1000m3 (or water supply population below 1 ten thousand), requires TDS limits due to conditions: the total amount of soluble solid is less than or equal to 1500 mg/L. Water quality standards issued by China and other countries refer to various water quality indexes specified in the drinking water standard of the world health organization, the standard specifies that urban domestic water is required to meet 106 related indexes, and the drinking water standard specified by the world health organization is consulted to know that the total TDS in specified drinking water cannot exceed the maximum value of 1000 mg/L. According to the relevant data, the regulations on the total amount of soluble solids in drinking water are strict and cannot exceed the limit value of 500mg/L in the drinking water quality standard established in the United states; in contrast, the water quality standard for drinking water established in Japan, in which the total amount of soluble solids is specified, is more strict, and the total amount of soluble solids in the property indexes that the pipe network water must have is not more than 300mg/L, and the limit value of the water quality index on the total amount of soluble solids is also specified to be 10mg/L to 100 mg/L. It can be seen that the TDS value in water is an important indicator of water quality.
The TDS detection method specified in 'sanitary Standard for Drinking Water' 2001 in China is a weighing method, wherein the TDS detection method comprises a water-bath steaming method and a drying method, and the principle is that a water sample is dried at a certain temperature, and the quality of obtained solid residues is the total solid content dissolved in water, including inorganic salts and organic matters which are not easy to volatilize. The measuring method has the disadvantages that the sample is difficult to be dried to constant weight, and the sample is easily polluted by external environment (dust, carbon dioxide and the like) in the weighing process, so that the ideal effect is difficult to achieve, and the measuring deviation is large.
Researchers find that most of the dissolved solids in water solution are inorganic substances in certain water bodies such as drinking water, and the inorganic substances exist in the solution in the form of ions, so that aiming at the water bodies, under the condition of low precision requirement, people obtain TDS by measuring the conductivity of the solution, and the TDS value of the solution is obtained by measuring the conductivity of the solution, so that the use is convenient. However, the detection by the electrode method only reflects the content of conductive inorganic matters, and the detection by the electrode method is greatly influenced by the charge type of charged ions, and the charge type of the charged ions has no fixed correlation with the mass. Therefore, the accuracy and method for measuring TDS by conductivity are poor in applicability, and the normal value is suitable for detecting water bodies with relatively constant water quality, such as municipal tap water, and the detection accuracy is poor for complex water bodies, such as source ground water and surface water.
Disclosure of Invention
In view of the above technical problems, the invention provides a device and a method for detecting the concentration of total soluble solids and hydrogen ions in water, which are used for solving the problem that the existing device or method has poor detection precision on complex water bodies.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to one aspect of the invention, a device for detecting the concentration of total soluble solids and hydrogen ions in water is disclosed, the device comprises a transparent shell, a lens support and a main board, wherein the main board is respectively connected with a light source module, a spectrum receiving module and two probes, and a detection cavity is enclosed between the shell and the lens support, wherein:
the light source module emits a preset monochromatic spectrum to the detection cavity under the control of the mainboard, and then the preset monochromatic spectrum is reflected to the spectrum receiving module by the reflecting lens fixed in the lens support, so that the spectrum receiving module generates a corresponding spectrum signal according to the received monochromatic spectrum and transmits the spectrum signal to the mainboard, and a hydrogen ion induction membrane capable of reacting with hydrogen ions is laid on the reflecting lens;
the two probes respectively penetrate through the shell and reach the detection cavity, when the detection cavity enters water to be detected, the two probes generate an electric field under the control of the main board, and charged ions in the water to be detected move to the electrodes so that the probes generate current signals;
the mainboard is used for receiving the spectrum signal and the current signal, then calculating and outputting an operation result.
Furthermore, the reflector plate is fixed on the lens support, and a metal aluminum film is laid on the reflecting surface of the reflector plate.
Furthermore, the hydrogen ion sensing membrane comprises a transparent base material, one surface of the base material facing the spectrum receiving module is provided with a sensing material layer which is generated by a chemical vapor deposition method and can reversibly react with hydrogen ions, and the other surface of the base material is tightly attached to the reflecting lens.
Furthermore, the device also comprises an optical support which is formed by injection molding of black optical plastic and arranged between the light source module and the shell, and the optical support is provided with a diaphragm hole for blocking light rays at different angles from passing through.
Furthermore, the optical bracket is further provided with a through hole for the two probes to pass through, the probes penetrate through the through hole and then are connected to the sleeve, and the sleeve is electrically connected with the mainboard.
Further, the light source module comprises a first ceramic substrate, a plurality of light emitting chips arranged on the first ceramic substrate in an array manner, a first metal dam surrounding the edge of the first ceramic substrate, and an optical lens arranged on the first metal dam, wherein the light emitting chips are connected with the main board through electrode pads arranged in the first ceramic substrate, so that the plurality of light emitting chips emit light under the control of the main board.
Furthermore, the spectrum receiving module comprises a second ceramic substrate, a first detector chip and a second detector chip which are laid on the second ceramic substrate, a second metal dam which is arranged around the edge of the second ceramic substrate, and an optical filter and a quartz plate which are arranged on the second metal dam, wherein the optical filter corresponds to the light emitting wavelength of the light source module.
Further, the mainboard includes MCU module, DAC module, bias current and reference signal module, ADC module, analog switch module, constant current source module, probe drive module and difference amplification module, wherein:
the MCU module is respectively connected with the DAC module, the bias current and reference signal module, the ADC module and the analog switch module, the DAC module is respectively connected with the bias current and reference signal module and the analog switch module, the analog switch module is respectively connected with the bias current and reference signal module, the constant current source module and the differential amplification module, the ADC module is respectively connected with the probe driving module and the differential amplification module, the probe driving module is connected with the probe, and the differential amplification module is connected with the spectrum receiving module;
the MCU module is used for sending a trigger signal, performing digital-to-analog conversion on the trigger signal by the DAC module and transmitting the trigger signal to the constant current source module through the analog switch module so that the constant current source module can transmit working current to the light source module and the probe driving module, and the light source module can send a monochromatic spectrum and the probe can generate an electric field;
after the probe receives the current signal, the current signal is transmitted to the ADC module through the probe driving module and is converted into a first digital signal through the ADC module in an analog-to-digital mode, and the first digital signal is stored in a memory by the MCU module;
after the spectrum receiving module receives the spectrum signal, the spectrum signal is transmitted to the ADC module through the differential amplification module to be converted into a second digital signal in an analog-to-digital mode, and the MCU module stores the second digital signal in a memory.
Furthermore, the device also comprises a thermistor module, wherein the thermistor module is connected with the ADC module through a signal acquisition module.
According to a second aspect of the present disclosure, there is provided a method for detecting the concentration of total dissolved solids and hydrogen ions in water, which can be applied to the above-mentioned apparatus, the method comprising the steps of:
immersing the detection cavity of the device into water to be detected;
the light source module is used for emitting a monochromatic spectrum to the detection cavity, and then the monochromatic spectrum is emitted to the spectrum receiving module by the reflection lens arranged in the detection cavity, so that a spectrum signal based on the current water to be detected is obtained, wherein a hydrogen ion induction membrane capable of reacting with hydrogen ions is paved on the reflection lens;
generating an electric field in the water to be detected by using the probe, so that charged ions in the water to be detected move to the electrode, and the probe generates a current signal;
and calculating the obtained spectrum signal and the current signal by using the mainboard to obtain the total dissolved solid concentration and the hydrogen ion concentration in the water.
The technical scheme of the disclosure has the following beneficial effects:
the device and the method have the characteristics of in-situ analysis and no need of reagents, and have great application potential in rapid water quality analysis. The organic matter in the water is detected by adopting the principle of spectral analysis, so that the accuracy is good; the detection device and the detection method can be used for simultaneously detecting the content of organic matters and inorganic matters in water and simultaneously quickly detecting the content of hydrogen ions in the water, have the characteristics of rapidness and convenience of an electrode method, are suitable for quickly detecting the total dissolved solids of various water bodies such as municipal tap water, water source ground water, surface water, sewage and the like, are simple, convenient and quick, have strong universality and have higher detection precision.
Drawings
FIG. 1 is an exploded view of a detecting device in an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a detection device in an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a reflector in an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a hydrogen ion sensitive membrane in an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of an optical mount in an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a light source module in an embodiment of the present disclosure;
fig. 7 is an exemplary distribution diagram of light emitting chips in the embodiments of the present specification;
FIG. 8 is a schematic structural diagram of a spectrum receiving module in an embodiment of the present disclosure;
fig. 9 is a block diagram of a structure of a motherboard in an embodiment of the present specification;
fig. 10 is a flowchart of a detection method in an embodiment of the present disclosure.
Reference numerals:
1. a housing;
2. a lens holder;
3. a main board; 301. an MCU module; 302. a DAC module; 303. a bias current and reference signal module; 304. an ADC module; 305. an analog switch module; 306. a constant current source module; 307. a probe drive module; 308. a differential amplification module; 309. a thermistor module; 310. a signal acquisition module;
4. a light source module; 41. a first ceramic substrate; 42. a light emitting chip; 43. a first metal dam; 44. an optical lens; 45. an electrode pad;
5. a spectrum receiving module; 51. a second ceramic substrate; 52. a first detector chip; 53. a second detector chip; 54. a second metal box dam; 55. an optical filter; 56. a quartz plate;
6. a probe;
7. a detection chamber;
8. a mirror plate; 81. a reflective surface; 82. a fixed surface; 83. a middle substrate;
9. a hydrogen ion sensing membrane; 91. a transparent substrate; 92. a layer of sensing material;
10. an optical mount; 101. a diaphragm aperture; 102. a through hole;
11. a sleeve;
12. and a communication interface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Translation of characters
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to fig. 2, an embodiment of the present specification provides a device for detecting total dissolved solids and hydrogen ion concentration in water, the device includes a transparent housing 1, a lens holder 2, and a main board 3, the main board 3 is respectively connected with a light source module 4, a spectrum receiving module 5, and two probes 6, a detection cavity 7 is enclosed between the housing 1 and the lens holder 2, wherein:
the light source module 4 emits a preset monochromatic spectrum to the detection cavity 7 under the control of the mainboard 3, and then the preset monochromatic spectrum is reflected to the spectrum receiving module 5 by the reflecting lens 8 fixed in the lens support 2, so that the spectrum receiving module 5 generates a corresponding spectrum signal according to the received monochromatic spectrum and transmits the spectrum signal to the mainboard 3, and a hydrogen ion sensing membrane 9 capable of reacting with hydrogen ions is laid on the reflecting lens 8;
the two probes 6 respectively penetrate through the shell 1 and reach the detection cavity 7, when the detection cavity 7 enters water to be detected, the two probes 6 generate an electric field under the control of the main board 3, and charged ions in the water to be detected move towards the electrodes to enable the probes 6 to generate current signals;
the mainboard 3 is used for receiving the spectrum signal and the current signal, then calculating and outputting a calculation result.
In one embodiment, the structure of the mirror plate is schematically shown in fig. 3, wherein the mirror plate 8 is fixed on the mirror plate holder 2, and the reflective surface 81 of the mirror plate 8 is coated with a metal aluminum film.
Specifically, the other surface of the reflector, i.e. the fixing surface 82, may be a polished surface or a frosted surface so as to be suitable for use in different scenes, and the middle substrate 83 is a lens made of quartz stone.
As shown in fig. 4, the hydrogen ion sensitive membrane 9 includes a transparent substrate 91, a sensitive material layer 92 that is generated by a chemical vapor deposition method and can reversibly react with hydrogen ions is disposed on one surface of the transparent substrate 91 facing the spectrum receiving module 5, and the other surface is closely attached to the reflecting mirror 8.
Wherein, the transparent substrate 91 can be made of transparent acrylate, the sensing material layer 92 is laid on the transparent substrate 91, wherein, the sensing material layer 92 can react with the hydrogen ions in the water, so that the transmissivity of the sensing material layer 92 changes, the light source module 4 emits monochromatic light which is refracted by the sensing material layer 92 and then emitted to the spectrum receiving module 5 by the reflecting lens 8, when the hydrogen ion concentration in the water is different, the transmissivity of the sensing material layer 92 is also different, and then the hydrogen ion concentration of the water quality can be deduced according to the spectrums of different forms received by the spectrum receiving module 5 when the water quality is detected, so as to realize the detection of the PH value, the specific material of the sensing material layer 92 can be made of various existing novel materials, as long as the material which can reversibly react with the hydrogen ions is realized, and the transmissivity of the material is changed after the reaction, are all inductive materials to which the present disclosure is directed.
In an embodiment, with continued reference to fig. 1, the apparatus further includes an optical support 10 formed by injection molding of black optical plastic, disposed between the light source module 4 and the housing 1, as shown in fig. 5, and the optical support 10 is provided with a diaphragm hole 101 for blocking light rays of different angles from passing through.
Specifically, diaphragm hole 101 can have two, one of them is arranged in supplying light source module 4 emission monochromatic light, another is used for supplying spectral reception module 5 to receive monochromatic light, the diaphragm hole 101 that sets up can avoid the scattered light line of 4 sides of light source module to directly launch in spectral reception module 5, avoid causing the influence to the testing result, and simultaneously, light source module 4 and spectral reception module 5 are lug connection on mainboard 3 generally, it is not hard up easily in long-term use, thereby influence the accurate nature of testing result, set up optical bracket 10 and can also play the effect of fixed light source module 4 and spectral reception module 5, stop light source module 4 and spectral reception module 5 on optical bracket 10, wherein light source module 4 and spectral reception module 5 set up side by side, make can obtain better detection effect.
Additionally, with reference to fig. 5, the optical bracket 10 is further provided with a through hole 102 for two probes 6 to pass through, the probes 6 are connected to the sleeve after penetrating through the through hole 102, and the sleeve 11 is electrically connected to the motherboard 3.
In one embodiment, as shown in fig. 6, the light source module 4 includes a first ceramic substrate 41, a plurality of light emitting chips 42 arranged on the first ceramic substrate 41 in an array manner, a first metal dam 43 arranged around an edge of the first ceramic substrate 41, and an optical lens 44 arranged on the first metal dam 43, wherein the light emitting chips 42 are connected to the main board 3 through electrode pads 45 arranged in the first ceramic substrate 41, so that the plurality of light emitting chips 42 emit light under the control of the main board 3.
The first metal dam 43 is used to block the lateral light leakage of the light source module, and the optical lens 44 may function as a light-gathering line, which may be a spherical lens or an aspherical lens as an example.
As shown in fig. 7, the light emitting chips 42 in the light source module 4 may be arranged in an array, specifically nine different light emitting chips may be arranged in a 3X3 array, and emit different monochromatic lights in the ultraviolet region, the visible light region and the infrared region, and may be 254nm, 275nm, 310nm, 365nm, 470nm, 535nm, 625nm, 850nm and 940nm, for example, the above spectral combinations are not unique, and different spectral combinations may be generated by replacing different light emitting chips 42.
In one embodiment, as shown in fig. 8, the spectrum reception module 5 includes a second ceramic substrate 51, a first detector chip 52 and a second detector chip 53 laid on the second ceramic substrate 51, a second metal dam 54 disposed around an edge of the second ceramic substrate 51, and a filter 55 and a quartz plate 56 disposed on the second metal dam 54, wherein the filter 55 corresponds to the emission wavelength of the light source module 4.
Monochromatic light emitted by the light source module 4 is received by the first detector chip 52 and the second detector chip 53 of the spectrum receiving module 5 after being refracted by the hydrogen ion sensing diaphragm 9 and reflected by the reflecting lens 8, the first detector chip 52 and the second detector chip 53 are connected with the mainboard 3, the received monochromatic light is converted into a spectrum signal and is transmitted to the mainboard 3, and the spectrum signal is analyzed and judged by the mainboard 3.
Exemplarily, the first detector chip and the second detector chip are photodiode chips, wherein the first detector chip 52 may be a PN junction structure made of a silicon-based material, the second detector chip 53 may be a gan-based PN junction structure, and the optical filter 55 corresponds to the light emitting wavelength of the light source module 4, that is, the optical filter 55 is a linear multi-narrowband optical filter, wherein the passband wavelength of the linear multi-narrowband optical filter corresponds to the light emitting wavelength of the entire column of light sources one-to-one, in this disclosure, 254nm, 275nm, 310nm, 365nm, 470nm, 535nm, 625nm, 850nm, 940nm, and corresponds to the light emitting chip 42 illustrated above, and the cut-off depth of the band-stop range of the linear multi-narrowband optical filter is greater than OD3, which has an effect of greatly improving the uniformity of spectral signals and the signal-to-noise ratio.
In one embodiment, as shown in fig. 9, the main board 3 includes an MCU block 301, a DAC block 302, a bias current and reference signal block 303, an ADC block 304, an analog switch block 305, a constant current source block 306, a probe driving block 307, and a differential amplification block 308, wherein:
the MCU module 301 is respectively connected with the DAC module 302, the bias current and reference signal module 303, the ADC module 304 and the analog switch module 305, the DAC module 302 is respectively connected with the bias current and reference signal module 303 and the analog switch module 305, the analog switch module 305 is respectively connected with the bias current and reference signal module 303, the constant current source module 306 and the differential amplification module 308, the ADC module 304 is respectively connected with the probe driving module 307 and the differential amplification module 308, the probe driving module 307 is connected with the probe 6, and the differential amplification module 308 is connected with the spectrum receiving module 5.
The MCU module 301 is configured to send a trigger signal, perform digital-to-analog conversion through the DAC module 302, and transmit the trigger signal to the constant current source module 306 through the analog switch module 305, so that the constant current source module 306 transmits a working current to the light source module 4 and the probe driving module 307, so that the light source module 4 sends monochromatic light and the probe 6 generates an electric field.
After the probe 6 receives the current signal, the current signal is transmitted to the ADC module 304 through the probe driving module 307, and is analog-to-digital converted into a first digital signal through the ADC module 304, and the MCU module 301 stores the first digital signal in the memory.
After the spectrum receiving module 5 receives the spectrum signal, the spectrum signal is transmitted to the ADC module 304 through the differential amplifying module 308 to be analog-to-digital converted into a second digital signal, and the MCU module 301 stores the second digital signal in the memory.
The MCU module 3013 collects the current signal of the probe 6 and the spectrum signal of the spectrum receiving module 5 in a time-sharing manner, and when collecting the current signal of the probe 6, the DAC module 302 sets a suitable voltage signal to output, and the voltage signal acts on the constant current source module 306, so that the constant current source module 306 generates a current of a constant magnitude, that is, by outputting voltage signals of different magnitudes, the constant current source module 306 can output fixed currents of different magnitudes, and in some implementations, the conductivity detection range of the present disclosure can be changed by outputting currents of different magnitudes through the constant current source module 306, thereby enabling the present disclosure to have a wider application. In addition, when acquiring the current signal of the probe 6, in order to prevent polarization of the probe 6, the signal generated by the constant current source module 306 enters one of the probes 6 through one of the channels of the analog switch module 305 which is opened at this time, then goes through the aqueous solution, another probe 6 and another channel of the analog switch module 305 in sequence back to the ground, at the same time, during this time, the ADC module 304 collects the voltage signal converted from the current signal of the probe 6, converts it to a first digital signal in analog-to-digital conversion, reads it from the MCU module 301, and records it as the current conductivity signal SDDL, that is, the data for determining the solubility of the inorganic substances in the water to be detected is obtained, then the MCU module 301 controls to close the current two channels of the analog switch module 305 and open the other two channels of the analog switch module 305, and at this time, the current returns to the power ground through the aqueous solution and the probe 6 again in the opposite direction. At the moment, positive and negative charges originally gathered on the probe are neutralized, so that the polarization of the probe is effectively prevented, and the service life of the device is prolonged.
In the process of acquiring the spectrum signal, the MCU module 301 controls the DAC module, the analog switch module, the constant current source module, the differential amplification module and the ADC module in a time-sharing manner to acquire the spectrum signal. Firstly, the MCU module generates different current configuration codes according to different wavelength characteristics of the array light source, the current configuration codes are stored in the memory as reference signals, exemplarily, reference vectors IB0{ I01I 02I 03I 04I 05I 06I 07I 08I 09}, the MCU module 301 controls the analog switch module 305 to sequentially turn on the constant current source module 306, and the light emitting chips 42 in the corresponding light source modules 4 are sequentially turned on. The light signal emitted by the light emitting chip 42 is reflected by the reflecting mirror 8 and then received by the spectrum receiving module 5, the voltage signal converted by the differential amplifying circuit 308 is collected by the ADC module 304, converted into a second digital signal and then recorded in the memory by the MCU, and recorded as a spectrum signal vector SSPEC { V1V 2V 3V 4V 5V 6V 7V 8V 9}, so as to obtain data for determining the organic matter in the water to be detected.
Exemplarily, the light signals emitted by the light emitting chips 42 are sent in a time-sharing manner, the spectrum receiving module 5 collects different light signals of the light emitting chips 42 according to a preset time sequence, among the nine light emitting chips 42 distributed in an array manner, monochromatic light of the three light emitting chips 42 located in the first row is collected by the second detector chip 53, that is, by the gallium nitride-based photodiode, and monochromatic light of the light emitting chips 42 located in the second row and the third row is collected by the first detector chip 52, that is, by the silicon-based photodiode.
In the disclosure, since the transmittance of the reflective mirror 8 is changed by using the hydrogen ion sensing membrane, the spectrum receiving module 5 can obtain a corresponding fluorescence spectrum signal, so as to obtain the hydrogen ion concentration in the water to be detected, in a specific implementation, after the spectrum signal of the above embodiment is collected, based on the same collection principle, the first detector chip 52 is used to separately collect the current fluorescence spectrum signal, specifically, the MCU module 301 controls the DAC module, the analog switch module, and the constant current source module to sequentially turn on four different monochromatic light sources of the light source module 4, correspondingly, the first detector chip 52 is used to collect the signal by using the silicon-based photodiode, and based on the same principle, the collected signal is combined into the second digital signal, and the four signals are recorded as the fluorescence signal SF in the memory of the MCU module { F1F 2F 3F 4}, thus obtaining the important factor for judging the hydrogen ion concentration in the water to be detected.
Based on the first digital signal, namely SDDL, and the second digital signal, namely SSPEC { V1V 2V 3V 4V 5V 6V 7V 8V 9} and SF ═ F1F 2F 3F 4} obtained in the above embodiments, the MCU module calculates the total soluble solids and hydrogen ion concentration in the water to be detected according to a preset proportional relationship.
In an embodiment, with continued reference to fig. 9, the motherboard 3 further includes a thermistor module 309, and the thermistor module 309 is connected to the ADC module 304 through the signal acquisition module 310.
The thermistor module 309 changes its resistance by the change of the external temperature, the voltage applied to the thermistor module 309 changes accordingly, the voltage of the thermistor module is obtained by the MCU module through the acquisition of the signal acquisition module 310 and the conversion of the ADC module 304, and the current temperature value can be obtained through the operation and conversion.
In an embodiment, with continued reference to fig. 1 and 9, the main board 3 may further be connected to a communication interface 12, specifically, the MCU module 301 is connected to the communication interface 12, and the information such as total dissolved solids and hydrogen ion concentration in the water to be detected, and current temperature, which are obtained by calculation by the MCU module, is transmitted to an external device (not shown in the drawings) through the connection of the communication interface 12, so as to be conveniently checked or recorded.
Through the disclosure of some exemplary embodiments, it can be known that the device has great application potential in rapid water quality analysis due to the characteristics of in-situ analysis and no need of reagents. The detection device and the detection method can simultaneously detect the content of organic matters and inorganic matters in water and can also rapidly detect the content of hydrogen ions in water, have the characteristics of rapidness and convenience of an electrode method, are suitable for rapidly detecting the total soluble solids of various water bodies such as municipal tap water, water source ground water, surface water, sewage and the like, are simple, convenient and rapid, have strong universality and have higher detection precision.
Based on the same idea, the exemplary embodiment of the present disclosure also provides a method for detecting the concentration of total dissolved solids and hydrogen ions in water, as shown in fig. 10, the method includes the following steps S1 to S4:
step S1, immersing the detection cavity of the device into water to be detected;
step S2, the light source module is used for emitting a monochromatic spectrum to the detection cavity, and then the monochromatic spectrum is emitted to the spectrum receiving module by the reflection lens arranged in the detection cavity, so as to obtain a spectrum signal based on the current water to be detected, wherein a hydrogen ion induction membrane capable of reacting with hydrogen ions is paved on the reflection lens;
step S3, generating an electric field in the water to be detected by using the probe, so that the charged ions in the water to be detected move to the electrode to enable the probe to generate a current signal;
and step S4, calculating the obtained spectrum signal and the current signal by using the mainboard to obtain the total dissolved solid concentration and the hydrogen ion concentration in the water.
Specifically, in step S4, after the spectrum signal and the current signal are obtained, the total soluble solids and the hydrogen ion concentration in the water to be detected are calculated according to the preset proportional relationship.
Exemplarily, the present embodiment provides a calculation method, which establishes a regression model between an independent variable S and a target detection result (dependent variable) W by using a multivariate linear regression method, and verifies the prediction accuracy by calculating a correlation coefficient and a square error sum of a prediction result and a true value, where the target detection result includes two results: the total soluble solid content and the hydrogen ion concentration of the solution are respectively obtained by adopting a standard weighing method and are recorded as TDS, the hydrogen ion concentration is measured by adopting a glass electrode and is recorded as PH, and the dependent variable matrix W (i.e. { TDS, PH }) with the row number of n and the column number of 2 is obtained.
Wherein, the multiple linear regression model:
W＝SK+E；
where W is a dependent variable matrix, S is an independent variable matrix, K is a coefficient matrix, and E is an error matrix
In the embodiment, water from a water source of a reservoir in a certain place is used as a basic water sample, sodium bicarbonate and tannin with different masses are added, 20 aqueous solutions with different TDS concentrations and pH values are prepared in an experiment, the TDS concentrations are distributed between 50 and 200mg/L, the pH values are distributed between 5 and 9, and then the real concentration values of the solutions are measured by adopting a standard weighing method and a glass electrode method.
With W and S known, K and E are obtained by matrix operation:
K＝(S'S)-1S'W；
E＝W-SK；
wherein S 'is the transposed matrix of S, (S' S)-1Represents the inverse matrix of S' S.
After K and E are obtained, a preset proportional relation is obtained, and the total soluble solid and hydrogen ion concentration in the water to be detected can be calculated according to the spectrum signal and the current signal.
It should be noted that: the establishment of the regression model is only one of the methods, and the regression model can also be established by adopting methods such as a partial least square method, an artificial neural network and the like. In addition, as the spectrum carries rich organic matter absorption information, other water quality parameters such as COD/TOC/DOM are obtained by changing a standard detection method, and chromaticity, turbidity and the like can also be used as dependent variables to establish a regression model, so that a multi-parameter water quality detection model is obtained. Therefore, the detection method can also be used for realizing multi-parameter water quality detection application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. The utility model provides a detection apparatus for aquatic dissolubility total solid and hydrogen ion concentration, its characterized in that, the device includes transparent casing, lens support and mainboard, the mainboard respectively with light source module, spectrum receiving module, two probe connections, the casing with enclose between the lens support and constitute and detect the chamber, wherein:
the light source module emits a preset monochromatic spectrum to the detection cavity under the control of the mainboard, and then the preset monochromatic spectrum is reflected to the spectrum receiving module by the reflecting lens fixed in the lens support, so that the spectrum receiving module generates a corresponding spectrum signal according to the received monochromatic spectrum and transmits the spectrum signal to the mainboard, and a hydrogen ion induction membrane capable of reacting with hydrogen ions is laid on the reflecting lens;
the two probes respectively penetrate through the shell and reach the detection cavity, when the detection cavity enters water to be detected, the two probes generate an electric field under the control of the main board, and charged ions in the water to be detected move to the electrodes so that the probes generate current signals;
the mainboard is used for receiving the spectrum signal and the current signal, then calculating and outputting an operation result.
2. The apparatus for detecting the concentration of total dissolved solids and hydrogen ions in water according to claim 1, wherein the reflector plate is fixed on the lens holder, and a metal aluminum film is laid on the reflecting surface of the reflector plate.
3. The apparatus for detecting total dissolved solids and hydrogen ion concentration in water according to claim 1, wherein the hydrogen ion sensitive membrane comprises a transparent substrate, one surface of the substrate facing the spectrum receiving module is provided with a sensitive material layer which is generated by chemical vapor deposition and can reversibly react with hydrogen ions, and the other surface of the substrate is tightly attached to the reflector.
4. The apparatus of claim 1, further comprising an optical bracket made of black optical plastic and disposed between the light source module and the housing, wherein the optical bracket is provided with a stop hole for blocking light rays of different angles from passing through.
5. The apparatus according to claim 4, wherein the optical support further comprises a through hole for two probes to pass through, the probes are connected to a sleeve after penetrating through the through hole, and the sleeve is electrically connected to the main board.
6. The apparatus according to claim 1, wherein the light source module comprises a first ceramic substrate, a plurality of light emitting chips arranged on the first ceramic substrate in an array manner, a first metal dam surrounding an edge of the first ceramic substrate, and an optical lens arranged on the first metal dam, and the light emitting chips are connected to the main board through electrode pads arranged in the first ceramic substrate, so that the plurality of light emitting chips emit light under the control of the main board.
7. The apparatus according to claim 1, wherein the spectrum-receiving module comprises a second ceramic substrate, a first detector chip and a second detector chip disposed on the second ceramic substrate, a second metal dam disposed around an edge of the second ceramic substrate, and a filter and a quartz plate disposed on the second metal dam, wherein the filter corresponds to an emission wavelength of the light source module.
8. The apparatus of claim 1, wherein the main board comprises an MCU module, a DAC module, a bias current and reference signal module, an ADC module, an analog switch module, a constant current source module, a probe driving module, and a differential amplifier module, wherein:
the MCU module is respectively connected with the DAC module, the bias current and reference signal module, the ADC module and the analog switch module, the DAC module is respectively connected with the bias current and reference signal module and the analog switch module, the analog switch module is respectively connected with the bias current and reference signal module, the constant current source module and the differential amplification module, the ADC module is respectively connected with the probe driving module and the differential amplification module, the probe driving module is connected with the probe, and the differential amplification module is connected with the spectrum receiving module;
the MCU module is used for sending a trigger signal, performing digital-to-analog conversion on the trigger signal by the DAC module and transmitting the trigger signal to the constant current source module through the analog switch module so that the constant current source module can transmit working current to the light source module and the probe driving module, and the light source module can send a monochromatic spectrum and the probe can generate an electric field;
after the probe receives the current signal, the current signal is transmitted to the ADC module through the probe driving module and is converted into a first digital signal through the ADC module in an analog-to-digital mode, and the first digital signal is stored in a memory by the MCU module;
after the spectrum receiving module receives the spectrum signal, the spectrum signal is transmitted to the ADC module through the differential amplification module to be converted into a second digital signal in an analog-to-digital mode, and the MCU module stores the second digital signal in a memory.
9. The apparatus for detecting the total dissolved solids and hydrogen ion concentration in water according to claim 8, further comprising a thermistor module, wherein the thermistor module is connected with the ADC module through a signal acquisition module.
10. A method for detecting the concentration of total dissolved solids and hydrogen ions in water, which can be applied to the device of any one of claims 1 to 9, comprising the steps of:
immersing the detection chamber of the device of any one of claims 1-9 in water to be detected;
the light source module is used for emitting a monochromatic spectrum to the detection cavity, and then the monochromatic spectrum is emitted to the spectrum receiving module by the reflection lens arranged in the detection cavity, so that a spectrum signal based on the current water to be detected is obtained, wherein a hydrogen ion induction membrane capable of reacting with hydrogen ions is paved on the reflection lens;
generating an electric field in the water to be detected by using the probe, so that charged ions in the water to be detected move to the electrode, and the probe generates a current signal;
and calculating the obtained spectrum signal and the current signal by using the mainboard to obtain the total dissolved solid concentration and the hydrogen ion concentration in the water.
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