CN112304888A - Water quality detection method, system and storage medium - Google Patents
Water quality detection method, system and storage medium Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 462
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 239000012535 impurity Substances 0.000 claims abstract description 95
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- OMOVVBIIQSXZSZ-UHFFFAOYSA-N [6-(4-acetyloxy-5,9a-dimethyl-2,7-dioxo-4,5a,6,9-tetrahydro-3h-pyrano[3,4-b]oxepin-5-yl)-5-formyloxy-3-(furan-3-yl)-3a-methyl-7-methylidene-1a,2,3,4,5,6-hexahydroindeno[1,7a-b]oxiren-4-yl] 2-hydroxy-3-methylpentanoate Chemical compound CC12C(OC(=O)C(O)C(C)CC)C(OC=O)C(C3(C)C(CC(=O)OC4(C)COC(=O)CC43)OC(C)=O)C(=C)C32OC3CC1C=1C=COC=1 OMOVVBIIQSXZSZ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a water quality detection method, a water quality detection system and a storage medium, wherein the water quality detection system comprises N sets of detection devices, the setting directions of each set of detection devices are different, each set of detection device comprises a transmitting plate and a receiving detection plate, and N is more than or equal to 2; controlling the emission plates of each of the N sets of detection devices to emit first ultraviolet light to the detection cavity respectively; respectively receiving second ultraviolet light which is emitted by the emitting plates of the detection devices and passes through the detection cavity through the receiving detection plates of the detection devices; determining the ultraviolet light variable quantity in each direction of N different directions corresponding to the N sets of detection devices; and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity. The invention can accurately detect the impurity concentration in water by eliminating the interference of the adhesion on the inner wall of the detection cavity to the water quality detection, thereby facilitating the user to know the filtering condition of the used water and being convenient for the user.
Description
Technical Field
The invention relates to the technical field of water quality detection, in particular to a water quality detection method, a water quality detection system and a storage medium.
Background
Along with the improvement of living standard of people, more and more importance is attached to the quality of domestic water, and the demand for detection of domestic water and drinking water is increasing day by day. After the filter is arranged, along with the increase of the service life of the filter, the filtered water is more necessary to be detected, and the service life of the filter is monitored while the water quality is monitored.
In the water quality detection of drinking water, as shown in fig. 1-3, in the prior art, since impurities in water adhere to the wall of flowing water, which includes a light detection channel, when impurities adhere to the wall of the detection channel, the adhered impurities also absorb light in the detected light path, so that the detection of the impurities in water becomes inaccurate, and the detection error increases with the passage of time.
At present, for existing problems, there are several solutions in the prior art, including cleaning with an internal brush, periodic cleaning with external ultrasonic waves, and estimation of the adhesion degree of the pipe wall according to time, which are complex in cleaning operation and general in cleaning effect, and thus, the detection equipment cannot accurately detect impurities in water.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to provide a water quality detection method, a water quality detection system and a storage medium, and aims to solve the problem that in the prior art, impurities in water are adhered to the wall of a flowing water, so that the impurities adhered to the wall of the flowing water influence a detection light path, and a detection device cannot accurately detect the impurities in the water.
In order to achieve the purpose, the invention provides a water quality detection method, which is applied to a water quality detection system, wherein the water quality detection system comprises N sets of detection devices, the setting directions of each set of detection devices are different, each set of detection device comprises a transmitting plate and a receiving detection plate, and N is more than or equal to 2; the water quality detection method comprises the following steps:
controlling the emission plates of each of the N sets of detection devices to emit first ultraviolet light to the detection cavity respectively;
respectively receiving second ultraviolet light which is emitted by the emitting plates of the detection devices and passes through the detection cavity through the receiving detection plates of the detection devices;
determining ultraviolet light variation in each of N different directions corresponding to the N sets of detection devices according to first ultraviolet light intensity emitted by an emission plate of each set of detection devices and second ultraviolet light intensity received by a receiving detection plate of each set of detection devices;
and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity in each direction of the N different directions.
Optionally, in the water quality detection method, the emission plates of the detection devices emit the same intensity of the first ultraviolet light when the detection is controlled by the micro control unit;
and the receiving diodes in the receiving detection plates of the detection devices convert the light-induced current generated by the second ultraviolet light received by the receiving detection plates into voltage through an operational amplifier circuit and output the voltage.
Optionally, in the water quality detection method, the N sets of detection devices include a first set of detection device and a second set of detection device, the first set of detection device includes a first transmitting plate and a first receiving detection plate, and the second set of detection device includes a second transmitting plate and a second receiving detection plate;
control each set of detection device's among the N sets of detection device expelling plate is respectively to detecting the cavity transmission first ultraviolet light, include:
controlling the first emission plate to emit first ultraviolet light to the detection cavity;
controlling the second emission plate to emit first ultraviolet light to the detection cavity;
the receiving detection board through each set of detection device respectively receives the second ultraviolet light which is emitted by the emission board of each set of detection device and passes through the detection cavity, and comprises:
receiving, by the first receiving and detecting plate, second ultraviolet light emitted by the first emitting plate and passing through the detecting cavity;
and receiving second ultraviolet light which is emitted by the second emitting plate and passes through the detection cavity through the second receiving and detecting plate.
Optionally, the water quality detecting method, wherein the determining, according to a first ultraviolet light intensity emitted by the emitting plate of each set of detecting device and a second ultraviolet light intensity received by the receiving and detecting plate of each set of detecting device, an ultraviolet light variation in each of N different directions corresponding to the N sets of detecting devices includes:
determining the ultraviolet light variation in the first detection direction corresponding to the first set of detection devices according to the intensity of the first ultraviolet light emitted by the first emission plate and the intensity of the second ultraviolet light received by the first receiving detection plate;
determining the ultraviolet light variation in the second detection direction corresponding to the second set of detection devices according to the first ultraviolet light intensity emitted by the second emission plate and the second ultraviolet light intensity received by the second receiving detection plate;
and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity in the first detection direction and the ultraviolet light variable quantity in the second detection direction.
Optionally, the water quality detecting method, wherein the determining the impurity concentration in the detection cavity water according to the ultraviolet light variation in the first detection direction and the ultraviolet light variation in the second detection direction includes:
acquiring the adhered substances on the inner wall of the detection cavity, the impurities in the water in the first detection direction and the second detection direction, and the light-absorbing substances obtained according to the ultraviolet light variation in the first detection direction and the second detection direction respectively;
the receiving detection plate of each set of detection device converts the photoinduction current generated by the second ultraviolet light which is emitted by the emission plate of each set of detection device and passes through the detection cavity into voltage to be output;
and obtaining the concentration of the impurities in the water of the detection cavity according to the impurities in the water, the light absorption substance and the voltage output.
Optionally, the water quality detecting method, wherein the acquiring the adhered substance on the inner wall of the detection cavity, the impurities in the water in the first detection direction and the impurities in the water in the second detection direction, and the light-absorbing substance obtained according to the ultraviolet light variation in the first detection direction and the ultraviolet light variation in the second detection direction respectively includes:
acquiring an adhesion object on the inner wall of the detection cavity as a supposed adhesion object B in advance, wherein the impurity in the water which absorbs the first ultraviolet light emitted by the first emitting plate in the first detection direction is a supposed impurity A1;
when the detection is carried out in the first detection direction, after the first ultraviolet light is emitted by the first emitting plate and passes through the detection cavity, the first receiving detection plate detects the second ultraviolet light through the light detection probe, and a first light absorbing substance A1+ B is obtained according to the ultraviolet light variation in the first detection direction;
the water impurity absorbing the first ultraviolet light emitted by the second emitting plate in the second detection direction is assumed impurity A2;
when the second detection direction is detected, after the second transmitting plate transmits the first ultraviolet light to pass through the detection cavity, the second receiving detection plate detects the second ultraviolet light through the light detection probe, and a second light absorption substance A2+ B is obtained according to the ultraviolet light variation in the second detection direction.
Optionally, the water quality detecting method, wherein the receiving and detecting board of each set of detecting devices converts a light-induced current generated by a second ultraviolet light emitted from the emitting board of each set of detecting devices and passing through the detecting cavity into a voltage output, and the method includes:
the first receiving detection plate converts light-induced current generated by second ultraviolet light emitted from the first emission plate and passing through the detection cavity into voltage to be output;
the second receiving detection plate converts light-induced current generated by second ultraviolet light which is emitted from the second emission plate and passes through the detection cavity into voltage to be output;
the relationship between the test voltage and the concentration of the light-absorbing substance is as follows:
when the first detection direction is detected: v1 ═ A1K1+ BK 3;
when the second detection direction is detected: v2 ═ A2K2+ BK 3;
wherein K1, K2 and K3 are constants, V1 is a voltage measurement value converted by the first receiving detection plate, and V2 is a voltage measurement value converted by the second receiving detection plate.
Optionally, the method for detecting water quality, wherein the obtaining of the concentration of the impurity in the detection cavity water according to the impurity in the water, the light absorption substance, and the voltage output includes:
the putative impurity a1 ═ K4X, the putative impurity a2 ═ K5X;
wherein K4 and K5 are constants, and X is the concentration of impurities in the water in the detection cavity;
from the putative impurity A1 and the putative impurity A2, then: V1-V2 ═ X (K1K4-K2K 5);
the concentration of impurities in the water is obtained as follows: x ═ V1-V2)/(K1K4-K2K 5.
In addition, in order to achieve the above object, the present invention also provides a water quality detecting system, wherein the water quality detecting system includes:
the direction of each set of detection device is different, and N is greater than or equal to 2;
the N sets of detection devices comprise a first set of detection device and a second set of detection device;
the first set of detection devices comprises a first transmitting plate and a first receiving detection plate;
the second set of detection devices comprises a second transmitting plate and a second receiving detection plate;
the first emission plate and the second emission plate are used for respectively emitting first ultraviolet light to the detection cavity;
the first receiving detection plate is used for receiving second ultraviolet light which is emitted by the first emission plate and passes through the detection cavity;
and the second receiving detection plate receives second ultraviolet light which is emitted by the second emission plate and passes through the detection cavity.
In order to achieve the above object, the present invention further provides a storage medium storing a water quality detection program, wherein the water quality detection program implements the steps of the water quality detection method described above when executed by a processor.
In the invention, during multi-direction detection, after the transmitting plate transmits ultraviolet light to pass through the detection cavity, the receiving detection plate detects a plurality of variable quantities of the ultraviolet light through the light detection probe; and obtaining the impurity concentration in the water of the detection cavity according to the plurality of variable quantities. The concentration of impurities in water is detected through two or more different light paths, and the adhesive on the inner wall of the cavity can be calculated, so that the interference of the adhesive on the inner wall of the detection cavity on water quality detection can be eliminated, the concentration of the impurities in the water can be accurately detected, and a user can conveniently know the filtering condition of the used water.
Drawings
FIG. 1 is a schematic diagram of a connection mode of modules for detecting the concentration of impurities in water in the prior art;
FIG. 2 is a schematic diagram of a water flow pattern of a detection module for detecting the concentration of impurities in water according to the prior art;
FIG. 3 is a top view of a prior art installed detection module for detecting the concentration of impurities in water;
FIG. 4 is a flow chart of a preferred embodiment of the water quality detecting method of the present invention;
FIG. 5 is a schematic plan view of the structure of the preferred embodiment of the water quality detecting apparatus of the present invention;
FIG. 6 is a schematic diagram of the emitter plate driving the emitter diode via the programmable constant current source according to the preferred embodiment of the water quality detecting method of the present invention;
FIG. 7 is a schematic diagram of a receiving diode on a receiving board converting a received photo-induced current into a voltage output through an operational amplifier circuit according to a preferred embodiment of the water quality detecting method of the present invention;
FIG. 8 is a schematic view of 2 detection curves in the case of no adhesive substance on the detection chamber in the preferred embodiment of the water quality detection method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The water quality detection method according to the preferred embodiment of the present invention is applied to a water quality detection system, as shown in fig. 4 and 5, the water quality detection system includes N sets of detection devices (two sets of detection devices are explained in fig. 5), wherein the directions of each set of detection devices are different, for example, when two sets of detection devices are provided, one set can be provided in the horizontal direction and one set can be provided in the vertical direction in fig. 5; when three sets of detection devices are provided, two sets of detection devices can be arranged like the two sets in fig. 5, and the other set can be inclined to other certain angles, for example, the other set is arranged at a certain angle with the horizontal or vertical direction. Each set of detection device comprises a transmitting plate and a receiving detection plate, the transmitting plate and the receiving detection plate in each set are arranged oppositely, namely the transmitting plate faces the receiving detection plate, so that ultraviolet light can be conveniently transmitted and received, N is more than or equal to 2, and N is a positive integer; the water quality detection method comprises the following steps:
and step S10, controlling the emission plates of each of the N sets of detection devices to respectively emit first ultraviolet light to the detection cavity.
Specifically, two sets of detection devices are preferred in the invention for water quality detection, that is, the N sets of detection devices include a first set of detection device (for example, a detection device in the transverse direction in fig. 5) and a second set of detection device (for example, a detection device in the vertical direction in fig. 5), the first set of detection device includes a first transmitting plate and a first receiving detection plate, and the second set of detection device includes a second transmitting plate and a second receiving detection plate.
In the invention, firstly, a water quality detection system is established in a pipeline of flowing water (namely, a detection cavity in the invention), as shown in fig. 5, first ultraviolet light is emitted by a first emission plate in a first detection direction (namely, a transverse direction), and reaches and receives a first detection plate after passing through water, and then the first ultraviolet light is emitted by a second emission plate in a second detection direction (namely, a vertical direction or multiple directions) in the pipeline (the detection cavity) through which water flows, and reaches and receives a second detection plate after passing through water.
Further, the controlling of the emission plate of each set of detection device in the N sets of detection devices to emit the first ultraviolet light to the detection cavity respectively specifically includes: controlling the first emission plate to emit first ultraviolet light to the detection cavity; and controlling the second emission plate to emit first ultraviolet light to the detection cavity.
And step S20, respectively receiving the second ultraviolet light which is emitted by the emitting plates of the detection devices and passes through the detection cavity through the receiving detection plates of the detection devices.
Specifically, in the first set of detection devices, the first receiving detection plate receives the second ultraviolet light which is emitted by the first emission plate and passes through the detection cavity; in the second set of detection devices, the second ultraviolet light emitted by the second emission plate and passing through the detection cavity is received by the second receiving detection plate.
Further, specifically, the transmitting plate and the receiving detection plate of each set of detection device are both arranged outside the detection cavity, and the corresponding surface of the detection cavity on the light path is made of transparent quartz glass and does not absorb ultraviolet light basically, so that the corresponding surface of the detection cavity does not influence the transmission of the ultraviolet light.
Wherein, the emission board of each set of detection device controls the intensity of the emitted first ultraviolet light to be the same when detecting through a micro control unit (MCU, Single Chip Microcomputer); as shown in fig. 6, the emitting diodes (LEDs in fig. 6) on the emitting plates of each set of detecting devices are driven by a program-controlled constant current source (dc stabilized power supply, model number TLC5916) controlled by MCU, so that the light of the emitting diodes is controlled, and because the light emission on the emitting plates is controllable, the emitted light on the two emitting plates can be adjusted to be consistent when the detecting devices are shipped; that is, the emitting panel controls the programmable constant current source to drive the emitting diode to emit the ultraviolet light through the MCU, so that the magnitude of the ultraviolet light emitted in each detection can be controlled to be the same (the intensity of the ultraviolet light is the same in the first detection direction or the second detection direction).
Wherein, the receiving diodes in the receiving detection boards of the detection devices convert the light-induced current generated by the second ultraviolet light received by the receiving diodes into voltage and output the voltage through an operational amplifier circuit (the receiving detection boards of the detection devices comprise the receiving diodes and the operational amplifier circuit); as shown in fig. 7, the receiving diode of the receiving detection board of each set of detection devices converts the current induced by the received light into a voltage output through an operational amplifier circuit, that is, the result of detecting the ultraviolet light change by the receiving detection board is obtained by detecting the current and then outputting the voltage, that is, the receiving diode of the receiving detection board converts the light-induced current generated by the receiving ultraviolet light into a voltage output through an operational amplifier circuit.
The transmitting plate of each set of detection device controls the output of ultraviolet light through the program-controlled constant current source, so that the output ultraviolet light of each test (detection) is stable and unchanged, if the water is pure, no impurities exist, the output ultraviolet light is completely received by the receiving detection plate, and the voltage value output by the circuit is an ideal value. When impurities exist in water, the absorption of the impurities in the water to light is reduced, and ultraviolet light reaching the receiving detection plate is reduced, so that the light-induced current on the receiving diode is changed, and the voltage output of a circuit is finally changed.
The above-described detection is ideally possible, but there may be impurities in the water which slowly adhere to the entire inner surface of the detection chamber over time, and there is an increasing amount of adhesion on the inner surface of the detection chamber. Naturally, the inner wall of the path of this detection light path also adheres to corresponding impurities.
According to the detection principle, the impurities adhered to the inner wall of the optical path are also absorbed by ultraviolet light, so that the final detection result is not the concentration of the impurities in the water due to the influence of the adhered substances on the inner wall, and the detection error is larger and larger along with the increase of time.
Therefore, in order to eliminate the interference of the adhered substances on the inner wall of the detection cavity on the water quality detection, a set of detection device is additionally arranged in the invention (as shown in fig. 5, a set of transmitting plate and a set of receiving detection plate are additionally arranged on the basis of the previous set of detection device), and the impurity concentration of the water in the detection cavity is detected from two different paths.
Specifically, the newly added emission plate and receiving detection plate have different light paths from the previous light paths, and the key is that the distances (light paths) of the detected water through which the ultraviolet light passes are different, that is, the ultraviolet light in different light paths is absorbed by different impurity particles in the same detected water sample, and the specific structure of the detection cavity structure, and the specific installation positions of the emission plate and the receiving detection plate are not limited in the present invention.
Because the transmitting plates of the detecting devices control the program-controlled constant current source through the MCU to drive the transmitting diodes to transmit the ultraviolet light, the intensity of the ultraviolet light transmitted in each detection can be controlled to be the same, namely, because the light emission on the transmitting plates is controllable, the ultraviolet light transmitted on the two transmitting plates is adjusted to be consistent, and the influence of the ultraviolet light with different intensities on the detection result is avoided.
The receiving and detecting boards of the emitting boards of each set of detecting devices can communicate with each other through an Inter-Integrated Circuit (IIC) or Serial Peripheral Interface (SPI), which is a high-speed, full-duplex, synchronous communication bus, and only four wires are occupied on the pins of the chip, thereby saving the pins of the chip, and simultaneously saving space on the layout of the PCB, and providing convenience.
Step S30, determining the ultraviolet light variation in each of N different directions corresponding to the N sets of detection devices according to the first ultraviolet light intensity emitted by the emission plate of each set of detection devices and the second ultraviolet light intensity received by the reception detection plate of each set of detection devices.
Specifically, the ultraviolet light variation in the first detection direction corresponding to the first set of detection devices is determined according to the intensity of the first ultraviolet light emitted by the first emission plate and the intensity of the second ultraviolet light received by the first receiving detection plate; determining the ultraviolet light variation in the second detection direction corresponding to the second set of detection devices according to the first ultraviolet light intensity emitted by the second emission plate and the second ultraviolet light intensity received by the second receiving detection plate; and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity in the first detection direction and the ultraviolet light variable quantity in the second detection direction.
And step S40, determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variation in each direction of the N different directions.
Specifically, the present invention uses two sets of detection devices to perform detection, so that determining the impurity concentration in the detection cavity water according to the ultraviolet light variation in the first detection direction and the ultraviolet light variation in the second detection direction specifically includes: acquiring the adhered substances on the inner wall of the detection cavity, the impurities in the water in the first detection direction and the second detection direction, and the light-absorbing substances obtained according to the ultraviolet light variation in the first detection direction and the second detection direction respectively; the receiving detection plate of each set of detection device converts the photoinduction current generated by the second ultraviolet light which is emitted by the emission plate of each set of detection device and passes through the detection cavity into voltage to be output; and obtaining the concentration of the impurities in the water of the detection cavity according to the impurities in the water, the light absorption substance and the voltage output.
Further, when water passes through the detection cavity, impurities in the water slowly adhere to the inner wall of the detection cavity due to the time relationship, because the water is changed, namely the concentration of the impurities in the water is changed according to the time, the concentration of the impurities in the water is not constant all the time, for the detection, the concentration of the impurities in the water is a variable, and the adhering impurities on the inner wall of the detection cavity are also a variable; thus, by using two different optical paths, 2 equations can be constructed for 2 variables, and then the 2 variables can be solved.
The reason why different optical paths are adopted is to construct different light absorption impurities in the water on the optical path and the reason why the stickers on the inner wall of the detection cavity are uniform, it can be considered that the light absorption of the stickers on the inner wall of the detection cavity on the different optical paths is the same. Therefore, in the 2 equations constructed, the influence of the same adhered substances can be eliminated by subtraction, and then the corresponding impurity concentration in water can be further obtained.
After the concentration of the impurities in the water is obtained, the amount of the adhesive on the wall of the detection cavity can be obtained by substituting the concentration into the equation, and basically, the adhesive on the detection cavity is uniform and can be considered as uniform; the difference in the transverse (first detection direction) length and longitudinal (second detection direction) width of the detection chamber means that the optical path is different, and thus the absorption of the emitted light is assumed to be assumed that the substance on the inner wall of the detection chamber is assumed to be adhered B, the impurity in water absorbing the first ultraviolet light emitted from the first emission plate in the first detection direction is assumed to be impurity a1, and the impurity in water absorbing the first ultraviolet light emitted from the second emission plate in the second detection direction is assumed to be impurity a 2.
Acquiring an assumed adhesive substance B as an adhesive substance on the inner wall of the detection cavity in advance (the assumed adhesive substance B is assumed, and then the assumed adhesive substance B is removed by detection in two different directions), wherein when detection is performed in the first detection direction, the first emitting plate emits the first ultraviolet light to pass through the detection cavity, the first receiving detection plate detects the second ultraviolet light through the light detection probe, and a first light absorbing substance A1+ B is obtained according to the ultraviolet light variation in the first detection direction; when the second detection direction is detected, after the second transmitting plate transmits the first ultraviolet light to pass through the detection cavity, the second receiving detection plate detects the second ultraviolet light through the light detection probe, and a second light absorption substance A2+ B is obtained according to the ultraviolet light variation in the second detection direction.
According to Lambert-beer law
Wherein, I0The intensity of incident light, I the transmitted light intensity, a the proportionality coefficient, b the liquid layer thickness (optical path length), and c the solution concentration.
This formula is transformed to yield: i ═ I0/(10Ab abc) that is a very small value in the lambert-beer equation above, such that the product of abc is a number greater than 0 but very close to 0.
In the case of a solution having a concentration in a certain range (i.e. c is not too large, such as not more than 100 g/l), I and I vary with c0The relationship of (a) is substantially linear.
The expression is shown in the test circuit, that is, in a certain solution concentration range, under the condition of certain ultraviolet light (emitted light), the quantity of the light-absorbing substance is inversely proportional to the voltage value output by the final circuit. Specifically, the larger the impurity concentration is, the more light is absorbed, the less current is induced, and the smaller the voltage to be output is.
The first receiving detection plate converts light-induced current generated by second ultraviolet light emitted from the first emission plate and passing through the detection cavity into voltage to be output; the second receiving detection plate converts light-induced current generated by second ultraviolet light which is emitted from the second emission plate and passes through the detection cavity into voltage to be output; the relationship between the test voltage and the concentration of the light-absorbing substance is as follows:
V1＝A1K1+BK3；
V2＝A2K2+BK3；
wherein, K1, K2 and K3 are all constants, V1 is the voltage measurement value converted by the first receiving detection plate, and V2 is the voltage measurement value converted by the second receiving detection plate.
Correspondingly, V1 ═ K1X and V2 ═ K2X are 2 detection curves in the case where no adhesive substance is present on the detection chamber, and it should be noted that the detection curve in the case where no adhesive substance is present on the detection chamber is an ideal detection curve; as shown in fig. 8, ideally, a and B are 2 ideal detection curves, where a is long-path and B is short-path.
And V is voltage obtained by converting current induced after the ultraviolet light enters the receiving detection plate.
Clearly, a1 is proportional to a2 and proportional to the concentration of impurities in the water.
Assuming that the assumed impurity a1 is K4X, and the assumed impurity a2 is K5X, where K4 and K5 are constants, and X is the concentration of the impurity in the detection cavity water.
From the putative impurity A1 and the putative impurity A2, then: V1-V2 ═ X (K1K4-K2K5), so the concentration of impurities in water: x ═ V1-V2)/(K1K4-K2K 5.
Because K1, K4, K2 and K5 are constants, the concentration of impurities in water can be easily obtained according to experimental data, and the concentration of impurities in water is obtained through calculation, so that the interference of adhesion substances on the inner wall of the detection cavity is completely eliminated, and the concentration of impurities in water is accurately detected.
Further, based on the water quality detection method, the invention also correspondingly provides a water quality detection system, which comprises: the direction of each set of detection device is different, and N is greater than or equal to 2; the N sets of detection devices comprise a first set of detection device and a second set of detection device; the first set of detection devices comprises a first transmitting plate and a first receiving detection plate; the second set of detection devices comprises a second transmitting plate and a second receiving detection plate; the first emission plate and the second emission plate are used for respectively emitting first ultraviolet light to the detection cavity; the first receiving detection plate is used for receiving second ultraviolet light which is emitted by the first emission plate and passes through the detection cavity; and the second receiving detection plate receives second ultraviolet light which is emitted by the second emission plate and passes through the detection cavity.
The invention also provides a storage medium, wherein the storage medium stores a water quality detection program, and the water quality detection program realizes the steps of the water quality detection method when being executed by a processor.
In summary, the present invention provides a water quality detection method, a water quality detection system and a storage medium, wherein the water quality detection method is applied to the water quality detection system, the water quality detection system comprises N sets of detection devices, the directions of the detection devices are different, each set of detection device comprises a transmitting plate and a receiving detection plate, and N is greater than or equal to 2; controlling the emission plates of each of the N sets of detection devices to emit first ultraviolet light to the detection cavity respectively; respectively receiving second ultraviolet light which is emitted by the emitting plates of the detection devices and passes through the detection cavity through the receiving detection plates of the detection devices; determining ultraviolet light variation in each of N different directions corresponding to the N sets of detection devices according to first ultraviolet light intensity emitted by an emission plate of each set of detection devices and second ultraviolet light intensity received by a receiving detection plate of each set of detection devices; determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variation in each of the N different directions; the specific implementation is as described above with reference to the related description. The invention can accurately detect the impurity concentration in water by eliminating the interference of the adhesion on the inner wall of the detection cavity to the water quality detection, thereby facilitating the user to know the filtering condition of the used water and being convenient for the user.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A water quality detection method is characterized in that the water quality detection method is applied to a water quality detection system, the water quality detection system comprises N sets of detection devices, the setting directions of each set of detection devices are different, each set of detection device comprises an emitting plate and a receiving detection plate, and N is more than or equal to 2; the water quality detection method comprises the following steps:
controlling the emission plates of each of the N sets of detection devices to emit first ultraviolet light to the detection cavity respectively;
respectively receiving second ultraviolet light which is emitted by the emitting plates of the detection devices and passes through the detection cavity through the receiving detection plates of the detection devices;
determining ultraviolet light variation in each of N different directions corresponding to the N sets of detection devices according to first ultraviolet light intensity emitted by an emission plate of each set of detection devices and second ultraviolet light intensity received by a receiving detection plate of each set of detection devices;
and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity in each direction of the N different directions.
2. The water quality detection method according to claim 1, wherein the emission plates of the detection devices emit the same intensity of the first ultraviolet light when the detection is controlled by the micro control unit;
and the receiving diodes in the receiving detection plates of the detection devices convert the light-induced current generated by the second ultraviolet light received by the receiving detection plates into voltage through an operational amplifier circuit and output the voltage.
3. The water quality detection method according to claim 1, wherein the N sets of detection devices comprise a first set of detection device and a second set of detection device, the first set of detection device comprises a first transmitting plate and a first receiving detection plate, and the second set of detection device comprises a second transmitting plate and a second receiving detection plate;
control each set of detection device's among the N sets of detection device expelling plate is respectively to detecting the cavity transmission first ultraviolet light, include:
controlling the first emission plate to emit first ultraviolet light to the detection cavity;
controlling the second emission plate to emit first ultraviolet light to the detection cavity;
the receiving detection board through each set of detection device respectively receives the second ultraviolet light which is emitted by the emission board of each set of detection device and passes through the detection cavity, and comprises:
receiving, by the first receiving and detecting plate, second ultraviolet light emitted by the first emitting plate and passing through the detecting cavity;
and receiving second ultraviolet light which is emitted by the second emitting plate and passes through the detection cavity through the second receiving and detecting plate.
4. A water quality detecting method according to claim 3, wherein the determining the ultraviolet light variation in each of the N different directions corresponding to the N sets of detecting devices according to the first ultraviolet light intensity emitted by the emitting plate of each set of detecting devices and the second ultraviolet light intensity received by the receiving and detecting plate of each set of detecting devices comprises:
determining the ultraviolet light variation in the first detection direction corresponding to the first set of detection devices according to the intensity of the first ultraviolet light emitted by the first emission plate and the intensity of the second ultraviolet light received by the first receiving detection plate;
determining the ultraviolet light variation in the second detection direction corresponding to the second set of detection devices according to the first ultraviolet light intensity emitted by the second emission plate and the second ultraviolet light intensity received by the second receiving detection plate;
and determining the impurity concentration in the water of the detection cavity according to the ultraviolet light variable quantity in the first detection direction and the ultraviolet light variable quantity in the second detection direction.
5. The water quality detection method according to claim 1, wherein the determining the impurity concentration in the detection chamber water according to the ultraviolet light variation in the first detection direction and the ultraviolet light variation in the second detection direction comprises:
acquiring the adhered substances on the inner wall of the detection cavity, the impurities in the water in the first detection direction and the second detection direction, and the light-absorbing substances obtained according to the ultraviolet light variation in the first detection direction and the second detection direction respectively;
the receiving detection plate of each set of detection device converts the photoinduction current generated by the second ultraviolet light which is emitted by the emission plate of each set of detection device and passes through the detection cavity into voltage to be output;
and obtaining the concentration of the impurities in the water of the detection cavity according to the impurities in the water, the light absorption substance and the voltage output.
6. The water quality detection method according to claim 5, wherein the acquiring of the adhered substance on the inner wall of the detection cavity, the impurities in the water in the first detection direction and the second detection direction, and the light-absorbing substance obtained according to the variation of the ultraviolet light in the first detection direction and the second detection direction respectively comprises:
acquiring an adhesion object on the inner wall of the detection cavity as a supposed adhesion object B in advance, wherein the impurity in the water which absorbs the first ultraviolet light emitted by the first emitting plate in the first detection direction is a supposed impurity A1;
when the detection is carried out in the first detection direction, after the first ultraviolet light is emitted by the first emitting plate and passes through the detection cavity, the first receiving detection plate detects the second ultraviolet light through the light detection probe, and a first light absorbing substance A1+ B is obtained according to the ultraviolet light variation in the first detection direction;
the water impurity absorbing the first ultraviolet light emitted by the second emitting plate in the second detection direction is assumed impurity A2;
when the second detection direction is detected, after the second transmitting plate transmits the first ultraviolet light to pass through the detection cavity, the second receiving detection plate detects the second ultraviolet light through the light detection probe, and a second light absorption substance A2+ B is obtained according to the ultraviolet light variation in the second detection direction.
7. The water quality detecting method according to claim 6, wherein the receiving detecting plate of each set of detecting devices converts a light-induced current generated by the second ultraviolet light emitted from the emitting plate of each set of detecting devices and passing through the detecting cavity into a voltage output, and comprises:
the first receiving detection plate converts light-induced current generated by second ultraviolet light emitted from the first emission plate and passing through the detection cavity into voltage to be output;
the second receiving detection plate converts light-induced current generated by second ultraviolet light which is emitted from the second emission plate and passes through the detection cavity into voltage to be output;
the relationship between the test voltage and the concentration of the light-absorbing substance is as follows:
when the first detection direction is detected: v1 ═ A1K1+ BK 3;
when the second detection direction is detected: v2 ═ A2K2+ BK 3;
wherein K1, K2 and K3 are constants, V1 is a voltage measurement value converted by the first receiving detection plate, and V2 is a voltage measurement value converted by the second receiving detection plate.
8. The water quality detection method according to claim 7, wherein the obtaining of the concentration of the impurities in the water in the detection chamber according to the impurities in the water, the light absorption substance and the voltage output comprises:
the putative impurity a1 ═ K4X, the putative impurity a2 ═ K5X;
wherein K4 and K5 are constants, and X is the concentration of impurities in the water in the detection cavity;
from the putative impurity A1 and the putative impurity A2, then: V1-V2 ═ X (K1K4-K2K 5);
the concentration of impurities in the water is obtained as follows: x ═ V1-V2)/(K1K4-K2K 5.
9. A water quality detection system, characterized in that, the water quality detection system includes:
the direction of each set of detection device is different, and N is greater than or equal to 2;
the N sets of detection devices comprise a first set of detection device and a second set of detection device;
the first set of detection devices comprises a first transmitting plate and a first receiving detection plate;
the second set of detection devices comprises a second transmitting plate and a second receiving detection plate;
the first emission plate and the second emission plate are used for respectively emitting first ultraviolet light to the detection cavity;
the first receiving detection plate is used for receiving second ultraviolet light which is emitted by the first emission plate and passes through the detection cavity;
and the second receiving detection plate receives second ultraviolet light which is emitted by the second emission plate and passes through the detection cavity.
10. A storage medium storing a water quality detection program that, when executed by a processor, implements the steps of the water quality detection method according to any one of claims 1 to 8.
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