CN109883997A - A kind of high-precision intelligent turbidity detection device and its scaling method and application method - Google Patents
A kind of high-precision intelligent turbidity detection device and its scaling method and application method Download PDFInfo
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Abstract
The invention discloses a kind of high-precision intelligent turbidity detection device and its calibration and application methods, the device is divided into three layers, the sonde configuration of bottom includes a photodiode and two light emitting diodes in same level, and a face photodiode in two light emitting diodes, another is vertical with photodiode；Top layer is circuit board, which includes constant current source driving circuit, the range switch circuit being electrically connected with constant current source driving circuit, which is electrically connected with two light emitting diodes in bottom sonde configuration respectively.High-precision intelligent turbidity detection device disclosed in this invention integrates two kinds of measurement methods of 90 ° of scattering methods and transmission beam method, and measurement accuracy is high, and measurement range is wide, can use under various measurement occasions.The high device of cost performance is selected, it is at low cost, practical, it has a good application prospect and promotional value in field of water quality detection.
Description
Technical field
The invention belongs to water quality detecting device field, in particular to one of field high-precision intelligent Turbidity measurement fills
It sets and its scaling method and application method.
Background technique
Turbidity is a kind of unit for characterizing water body muddiness degree, is a critically important physical finger in water quality monitoring
Mark.Regardless of domestic or external, to the process water in people's lives water and other industry will detect turbidity this
Parameter index, and the sewage generated in river, river, lake, sea and human production life is also necessary to carry out turbidity size
Detection.
According to the measuring principle of turbidity, the measurement method of turbidity is divided into transmission beam method and 90 ° of scattering methods.It is general in the world at present
Measurement method be 90 ° of scattering methods, this measurement method linearity is good, and measurement accuracy is high, but when water turbidity is higher by
The influence of rescattering, 90 ° of scattering light not can correctly reflect its turbidity, therefore the measurement range of this measurement method generally exists
0~200NTU.Transmission beam method reflects its turbidity by measuring the absorbance of water body, in 200~1000NTU and range above interior lines
Property degree is good, is more suitable for the measurement of centering high concentrtion.Transmissometer currently on the market mostly uses greatly 90 ° of scattering methods, and precision is lower
And it is expensive.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of high-precision intelligent turbidity detection device and its calibration sides
Method and application method.
The present invention adopts the following technical scheme:
A kind of high-precision intelligent turbidity detection device, thes improvement is that: the device is divided into three layers, the spy of bottom
Header structure includes a photodiode and two light emitting diodes in same level, one in two light emitting diodes
Face photodiode, another is vertical with photodiode；Top layer is circuit board, which includes constant-current source driving electricity
Road, the range switch circuit being electrically connected with constant current source driving circuit, the range switch circuit is respectively and in bottom sonde configuration
Two light emitting diode electrical connections additionally include the I/V conversion electricity being electrically connected with the photodiode in bottom sonde configuration
Road, the I/V conversion circuit are electrically connected by filtering and amplifying circuit with pre-amplification circuit, pre-amplification circuit and temperature-compensating electricity
The electrical connection of Lu Junyu A/D converter circuit, A/D converter circuit is then electrically connected with governor circuit, governor circuit and storage circuit and communication
Circuit electrical connection, telecommunication circuit and human-computer interaction interface connection communication；The power module of middle layer is device power supply.
Further, the device is black shell structure；The bottom surface of bottom probe is inclined-plane and is recessed inwardly, and is sent out
Optical diode is mounted in the light emitting diode mounting hole by optical window sealing, and photodiode is mounted on by lens seals
In photodiode mounting hole, and the center of light emitting diode mounting hole and photodiode mounting hole is in the same level
On face.
Further, the constant current source driving circuit is high-precision controllable constant-current source；The I/V conversion circuit is adjustable
Gain I/V conversion circuit；The range switch circuit is dual-channel analog switch；The temperature-compensation circuit is high precision constant current
Source drives PT1000；The governor circuit is STM32F103CBT6；The storage circuit is SD card, and uses FatFs file system
System；The telecommunication circuit is Lora wireless communication.
Further, the adjustable gain I/V conversion circuit includes operational amplifier, the input terminal of the operational amplifier with
Photodiode, filter capacitor C1, C2, C3, C4 and C5 electrical connection, output end are electrically connected with LC π type filter circuit, the LC
π type filtered electrical routing capacitance C7, C8 and inductance L1 composition, two precision resistances R2, R3 of parallel connection between input terminal and output end
With a capacitor C6, wherein precision resistance R2, R3 is by governor circuit control analog switch gating.
Further, the power module is linear stabilized power supply and uses tantalum capacitor and ceramic condenser parallel way to electricity
The voltage output end of source module is filtered；Digital-to-analogue isolation is carried out using magnetic bead between governor circuit and A/D converter circuit, is made
Single-point grounding is carried out with 0 Ω resistance.
A kind of scaling method, using above-mentioned high-precision intelligent turbidity detection device, it is improved in that including as follows
Step:
(1) within the scope of 0-200NTU, a kind of turbidity standard solution is configured every 20NTU, amounts to 11 kinds；
(2) within the scope of 200-1000NTU, a kind of turbidity standard solution is configured every 50NTU, amounts to 16 kinds；
(3) probe of device bottom is placed in the turbidity standard solution in insulating box, T=20 DEG C of the temperature of insulating box,
90 ° of scattering methods are selected within the scope of 0-200NTU, are selected transmission beam method within the scope of 200-1000NTU, are collected and recorded different turbidity
The corresponding photoelectric signal of standard solution；
(4) it within the scope of 0-100NTU and 100-200NTU, using least square method digital simulation expression formula, establishes turbid
The peg model of degree and photoelectric signal natural logrithm:
(5) it within the scope of 200-600NTU and 600-1000NTU, using least square method digital simulation expression formula, builds
The peg model of vertical turbidity and photoelectric signal natural logrithm:
(6) by the turbidity standard solution in the probe merging insulating box of device bottom, at 20 DEG C, the turbidity standard is molten
The turbidity of liquid is 400NTU, changes calorstat temperature T, using temperature-compensation circuit temperature collection information, is recorded under different temperatures
Turbidity measurement of the device to the turbidity standard solution；
(7) choosing 20 DEG C of T-is x1, absolute error, that is, turbidity measurement -400NTU is y1, calculated using least square method
Fitting expression establishes the model of temperature compensation of device: y1=mx1+n；
(8) turbidity value measured at this time is set as Q, then model of temperature compensation can convert are as follows: Q-400=c400 (T-20)
+ n, wherein m=c400, therefore every 1 DEG C of the variation of temperature, turbidity value increase c times；
(9) by model of temperature compensation bring into corresponding peg model can obtain it is temperature compensated after peg model:
Turbidity measured value in above formula, after Y-is temperature compensated；X-photoelectric signal natural logrithm value；A-calibration
Model slope value, b-peg model intercept；N-model of temperature compensation intercept；C-coefficient.
A kind of application method, using above-mentioned high-precision intelligent turbidity detection device, it is improved in that including as follows
Step:
(1) by electrification reset after the probe merging solution to be measured of device bottom, parameter initialization；
(2) 90 ° of scattering method gears of range switch circuit default choice connect the light-emitting diodes vertical with photodiode
Pipe drives the above-mentioned lumination of light emitting diode being switched on by constant current source driving circuit, and the light that light emitting diode issues is through to be measured molten
Enter photodiode after liquid scattering, electric current is induced by photodiode, which is converted into mV grades of electricity through I/V conversion circuit
Signal is pressed, which enters governor circuit, governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit
The voltage signal is set as current voltage signal, governor circuit goes out turbidity value according to current voltage signal primary Calculation, if tentatively
Calculated turbidity value is greater than 200NTU, then needs to control range switch circuit and be switched to transmission beam method gear, i.e. connection and photoelectricity
The light emitting diode of diode face, the light that light emitting diode issues is transmitted into photodiode through solution to be measured, by photoelectricity
Diode induces electric current again, which is converted into new mV magnitude voltage signals through I/V conversion circuit, should
New voltage signal enters governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit again, and governor circuit will
The new voltage signal is set as current voltage signal；
(3) collected current temperature signal is sent into governor circuit, master control by A/D converter circuit by temperature-compensation circuit
Circuit according to current voltage signal and Current Temperatures calculate it is temperature compensated after turbidity value；
(4) turbidity value is sent to human-computer interaction interface through telecommunication circuit and shows.
Further, in step (2), the luminous frequency of light emitting diode is controlled by PWM；Photodiode work exists
Under guided optical mode；I/V conversion circuit is high-gain in 90 ° of scattering methods, is low gain in transmission beam method.
Further, data are filtered using moving average filter in governor circuit calculating process, circuit board uses
LC π type filtering mode is filtered.
Further, the system kernel that governor circuit is selected is real time operating system FreeRTOS, FreeRTOS task packet
Include initialization task, communication task, turbidity acquisition tasks, temperature acquisition task, data processing task, data store tasks sum number
According to display task, by FreeRTOS task dispatcher according to task priority United Dispatching.
The beneficial effects of the present invention are:
High-precision intelligent turbidity detection device disclosed in this invention collects two kinds of measurement methods of 90 ° of scattering methods and transmission beam method
, measurement accuracy is high, and measurement range is wide, can use under various measurement occasions.The device for selecting cost performance high, cost
It is low, practical, it has a good application prospect and promotional value in field of water quality detection.
High-precision intelligent turbidity detection device disclosed in this invention, using black shell structure can to avoid measurement when by
The influence of stray light；The bottom surface of bottom probe is that inclined-plane and being recessed inwardly facilitates water flow entrance；Using FatFs file system
System reduces the risk of storing data loss；Using Lora communication, long transmission distance, it can be achieved that remotely exist in real time
Line detection.Power module uses linear stabilized power supply, and the ripple of output voltage is small, carries out hardware filtering in voltage output end,
Improve the quality of power supply.
Scaling method disclosed in this invention carries out piecewise fitting using least square method, and different measurement ranges is selected
Different fitting formulas measures solution temperature to be measured using temperature-compensation circuit, recycles model of temperature compensation to peg model
Temperature-compensating is carried out, turbidity data when converting 20 DEG C for the turbidity data under Current Temperatures guarantees device in different temperatures
Under still have degree of precision.
Application method disclosed in this invention is controlled the luminous frequency of light emitting diode by PWM, solves light-emitting diodes
The problem of fever of pipe range time leads to flashing, improve the measurement accuracy of device.I/V conversion circuit is in 90 ° of scattering methods
For high-gain, it is low gain in transmission beam method, expands measurement range, improve the measurement accuracy and intelligent level of device.
Moving average filter (software filtering) combines the anti-interference ability for improving device with LC π type filtering (hardware filtering).It selects
The light-type operating system FreeRTOS of strong real-time is system kernel, can be very good the bottom hardware of shielding microprocessor,
The features such as with varied-mission versions, Scalability, real-time and reliable and stable application code.Multiple are established based on FreeRTOS
Business, then by FreeRTOS task dispatcher United Dispatching, clear layer enhances the stability and reliability of system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of device disclosed in the embodiment of the present invention 1；
Fig. 2 is the circuit composition block diagram of top layer circuit board in device disclosed in the embodiment of the present invention 1；
Fig. 3 is the circuit connection diagram of I/V conversion circuit in device disclosed in the embodiment of the present invention 1；
Fig. 4 is the flow diagram of application method disclosed in the embodiment of the present invention 1；
Fig. 5 is the task schedule schematic diagram of FreeRTOS in application method disclosed in the embodiment of the present invention 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right below in conjunction with drawings and examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1, as shown in figures 1 and 2, present embodiment discloses a kind of high-precision intelligent turbidity detection device, the dresses
It sets and is divided into three layers, the sonde configuration of bottom includes a photodiode and two light emitting diodes in same level,
A face photodiode in two light emitting diodes, another is vertical with photodiode；Top layer is circuit board 1, the electricity
Road plate includes constant current source driving circuit 114, the range switch circuit 113 being electrically connected with constant current source driving circuit, range switching
Circuit is electrically connected with two light emitting diodes 112 in bottom sonde configuration respectively, additionally include in bottom sonde configuration
The I/V conversion circuit 19 that is electrically connected of photodiode 111, which passes through filtering and amplifying circuit 18 and preceding storing
Big circuit 16 is electrically connected, and pre-amplification circuit and temperature-compensation circuit 12 are electrically connected with A/D converter circuit 14, A/D converter circuit
It is then electrically connected with governor circuit 15, governor circuit and storage circuit 17 and telecommunication circuit 13 are electrically connected, telecommunication circuit and man-machine friendship
11 connection communication of mutual interface；The power module 2 of middle layer is device power supply.
In the present embodiment, the device is black shell structure；The bottom surface of bottom probe is inclined-plane and concaves
It falls into, light emitting diode is mounted on by optical window 6,7 (optical window can also be used to optical signal being converted to directional light) sealing
In light emitting diode mounting hole 5,8, photodiode is mounted on by the light of lens 4 (lens can be used for aggregation optical signal) sealing
In electric diode mounting hole 3, and the center of light emitting diode mounting hole and photodiode mounting hole is in the same level
On face.
In the present embodiment, the light emitting diode is infrared diode, and the constant current source driving circuit is high-precision
Spend controllable constant-current source；The I/V conversion circuit is adjustable gain I/V conversion circuit；The range switch circuit is binary channels mould
Quasi- switch；The temperature-compensation circuit is that high precise current source drives PT1000；The governor circuit is STM32F103CBT6；
The storage circuit is SD card, and uses FatFs file system；The telecommunication circuit is Lora wireless communication.The power supply
Module is lithium battery.
As shown in figure 3, the adjustable gain I/V conversion circuit includes operational amplifier, the input terminal of the operational amplifier
It is electrically connected with photodiode, filter capacitor C1, C2, C3, C4 and C5, the product of operational amplifier power supply can be improved in filter capacitor
Matter, output end are electrically connected with LC π type filter circuit, and LC π type filtered electrical routing capacitance C7, C8 and inductance L1 composition is used
Carry out the anti-interference ability of enhancement device, improves measurement accuracy.Two precision resistances R2, R3 of parallel connection between input terminal and output end
With a capacitor C6, wherein precision resistance R2, R3 is by governor circuit control analog switch gating to realize adjustable gain, capacitor C6
The clutter noise on precision resistance R2, R3 can be eliminated to improve the stability of signal.
In the present embodiment, the power module is linear stabilized power supply and uses tantalum capacitor and ceramic condenser parallel way
The voltage output end of power module is filtered；Between governor circuit and A/D converter circuit using magnetic bead carry out digital-to-analogue every
From, use 0 Ω resistance carry out single-point grounding.
The present embodiment also discloses a kind of scaling method, using above-mentioned high-precision intelligent turbidity detection device, including such as
Lower step:
(1) within the scope of 0-200NTU, a kind of turbidity standard solution is configured every 20NTU, amounts to 11 kinds；
(2) within the scope of 200-1000NTU, a kind of turbidity standard solution is configured every 50NTU, amounts to 16 kinds；
(3) probe of device bottom is placed in the turbidity standard solution in insulating box, T=20 DEG C of the temperature of insulating box,
90 ° of scattering methods are selected within the scope of 0-200NTU, are selected transmission beam method within the scope of 200-1000NTU, are collected and recorded different turbidity
The corresponding photoelectric signal of standard solution；
(4) it within the scope of 0-100NTU and 100-200NTU, using least square method digital simulation expression formula, establishes turbid
The peg model of degree and photoelectric signal natural logrithm:
(5) it within the scope of 200-600NTU and 600-1000NTU, using least square method digital simulation expression formula, builds
The peg model of vertical turbidity and photoelectric signal natural logrithm:
(6) by the turbidity standard solution in the probe merging insulating box of device bottom, at 20 DEG C, the turbidity standard is molten
The turbidity of liquid is 400NTU, changes calorstat temperature T, using temperature-compensation circuit temperature collection information, is recorded under different temperatures
Turbidity measurement of the device to the turbidity standard solution；
(7) choosing 20 DEG C of T-is x1, absolute error, that is, turbidity measurement -400NTU is y1, calculated using least square method
Fitting expression establishes the model of temperature compensation of device: y1=mx1+n；
(8) turbidity value measured at this time is set as Q, then model of temperature compensation can convert are as follows: Q-400=c400 (T-20)
+ n, wherein m=c400, therefore every 1 DEG C of the variation of temperature, turbidity value increase c times；
(9) by model of temperature compensation bring into corresponding peg model can obtain it is temperature compensated after peg model:
Turbidity measured value in above formula, after Y-is temperature compensated；X-photoelectric signal natural logrithm value；A-calibration
Model slope value, b-peg model intercept；N-model of temperature compensation intercept；C-coefficient.
As shown in figure 4, the present embodiment also discloses a kind of application method, filled using above-mentioned high-precision intelligent Turbidity measurement
It sets, includes the following steps:
(1) by electrification reset after the probe merging solution to be measured of device bottom, parameter initialization；
(2) 90 ° of scattering method gears of range switch circuit default choice connect the light-emitting diodes vertical with photodiode
Pipe drives the above-mentioned lumination of light emitting diode being switched on by constant current source driving circuit, and the light that light emitting diode issues is through to be measured molten
Enter photodiode after liquid scattering, electric current is induced by photodiode, which is converted into mV grades of electricity through I/V conversion circuit
Signal is pressed, which enters governor circuit, governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit
The voltage signal is set as current voltage signal, governor circuit goes out turbidity value according to current voltage signal primary Calculation, if tentatively
Calculated turbidity value is greater than 200NTU, then needs to control range switch circuit and be switched to transmission beam method gear, i.e. connection and photoelectricity
The light emitting diode of diode face, the light that light emitting diode issues is transmitted into photodiode through solution to be measured, by photoelectricity
Diode induces electric current again, which is converted into new mV magnitude voltage signals through I/V conversion circuit, should
New voltage signal enters governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit again, and governor circuit will
The new voltage signal is set as current voltage signal；
(3) collected current temperature signal is sent into governor circuit, master control by A/D converter circuit by temperature-compensation circuit
Circuit according to current voltage signal and Current Temperatures calculate it is temperature compensated after turbidity value；
(4) turbidity value is sent to human-computer interaction interface through telecommunication circuit and shows.
In step (2), the luminous frequency of light emitting diode is controlled by PWM；Photodiode work is in guided optical mode
Under, the measurement accuracy of device can be improved；I/V conversion circuit is high-gain in 90 ° of scattering methods, is low increasing in transmission beam method
Benefit.Data are filtered in governor circuit calculating process using moving average filter, circuit board using LC π type filtering mode into
Row filtering.
As shown in figure 5, the system kernel that governor circuit is selected is real time operating system FreeRTOS, FreeRTOS task packet
Include initialization task, communication task, turbidity acquisition tasks, temperature acquisition task, data processing task, data store tasks sum number
According to display task, by FreeRTOS task dispatcher according to task priority United Dispatching.
Claims (10)
1. a kind of high-precision intelligent turbidity detection device, it is characterised in that: the device is divided into three layers, the sonde configuration of bottom
Including the photodiode and two light emitting diodes in same level, a face light in two light emitting diodes
Electric diode, another is vertical with photodiode；Top layer is circuit board, which includes constant current source driving circuit, with perseverance
The range switch circuit of source driving circuit electrical connection is flowed, which shines with two in bottom sonde configuration respectively
Diode electrical connection, additionally includes the I/V conversion circuit being electrically connected with the photodiode in bottom sonde configuration, the I/V
Conversion circuit is electrically connected by filtering and amplifying circuit with pre-amplification circuit, and pre-amplification circuit and temperature-compensation circuit are and AD
Conversion circuit electrical connection, A/D converter circuit are then electrically connected with governor circuit, and governor circuit and storage circuit and telecommunication circuit are electrically connected
It connects, telecommunication circuit and human-computer interaction interface connection communication；The power module of middle layer is device power supply.
2. high-precision intelligent turbidity detection device according to claim 1, it is characterised in that: the device is black shell
Body structure；The bottom surface of bottom probe is inclined-plane and is recessed inwardly that light emitting diode is mounted on shining by optical window sealing
In diode mounting hole, photodiode is mounted in the photodiode mounting hole by lens seals, and light emitting diode
The center of mounting hole and photodiode mounting hole is on the same horizontal plane.
3. high-precision intelligent turbidity detection device according to claim 1, it is characterised in that: the constant-current source drives electricity
Road is high-precision controllable constant-current source；The I/V conversion circuit is adjustable gain I/V conversion circuit；The range switch circuit is
Dual-channel analog switch；The temperature-compensation circuit is that high precise current source drives PT1000；The governor circuit is
STM32F103CBT6；The storage circuit is SD card, and uses FatFs file system；The telecommunication circuit is Lora channel radio
Letter.
4. high-precision intelligent turbidity detection device according to claim 3, it is characterised in that: the adjustable gain I/V turns
Changing circuit includes operational amplifier, the input terminal and photodiode, filter capacitor C1, C2, C3, C4 and C5 of the operational amplifier
Electrical connection, output end are electrically connected with LC π type filter circuit, described LC π type filtered electrical routing capacitance C7, the C8 and inductance L1 group
At, a parallel connection two precision resistance R2, R3 and capacitor C6 between input terminal and output end, wherein precision resistance R2, R3 by
Governor circuit controls analog switch gating.
5. high-precision intelligent turbidity detection device according to claim 1, it is characterised in that: the power module is linear
Regulated power supply is simultaneously filtered using tantalum capacitor with voltage output end of the ceramic condenser parallel way to power module；In master control electricity
Digital-to-analogue isolation is carried out using magnetic bead between road and A/D converter circuit, carries out single-point grounding using 0 Ω resistance.
6. a kind of scaling method uses high-precision intelligent turbidity detection device described in claim 1, which is characterized in that including
Following steps:
(1) within the scope of 0-200NTU, a kind of turbidity standard solution is configured every 20NTU, amounts to 11 kinds；
(2) within the scope of 200-1000NTU, a kind of turbidity standard solution is configured every 50NTU, amounts to 16 kinds；
(3) probe of device bottom is placed in the turbidity standard solution in insulating box, T=20 DEG C of the temperature of insulating box, 0-
90 ° of scattering methods are selected within the scope of 200NTU, are selected transmission beam method within the scope of 200-1000NTU, are collected and recorded different turbidity standards
The corresponding photoelectric signal of solution；
(4) within the scope of 0-100NTU and 100-200NTU, using least square method digital simulation expression formula, establish turbidity with
The peg model of photoelectric signal natural logrithm:
(5) it within the scope of 200-600NTU and 600-1000NTU, using least square method digital simulation expression formula, establishes turbid
The peg model of degree and photoelectric signal natural logrithm:
(6) probe of device bottom is placed in the turbidity standard solution in insulating box, the turbidity standard solution at 20 DEG C
Turbidity is 400NTU, changes calorstat temperature T, using temperature-compensation circuit temperature collection information, records device under different temperatures
To the turbidity measurement of the turbidity standard solution；
(7) choosing 20 DEG C of T-is x1, absolute error, that is, turbidity measurement -400NTU is y1, use least square method digital simulation
Expression formula establishes the model of temperature compensation of device: y1=mx1+n；
(8) turbidity value measured at this time is set as Q, then model of temperature compensation can convert are as follows: Q-400=c400 (T-20)+n,
Wherein m=c400, therefore every 1 DEG C of the variation of temperature, turbidity value increase c times；
(9) by model of temperature compensation bring into corresponding peg model can obtain it is temperature compensated after peg model:
Turbidity measured value in above formula, after Y-is temperature compensated；X-photoelectric signal natural logrithm value；A-peg model
Slope value, b-peg model intercept；N-model of temperature compensation intercept；C-coefficient.
7. a kind of application method uses high-precision intelligent turbidity detection device described in claim 1, which is characterized in that including
Following steps:
(1) by electrification reset after the probe merging solution to be measured of device bottom, parameter initialization；
(2) 90 ° of scattering method gears of range switch circuit default choice connect the light emitting diode vertical with photodiode,
The above-mentioned lumination of light emitting diode being switched on is driven by constant current source driving circuit, the light that light emitting diode issues is dissipated through solution to be measured
Enter photodiode after penetrating, electric current is induced by photodiode, which, which is converted into mV step voltage through I/V conversion circuit, believes
Number, which enters governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit, and governor circuit should
Voltage signal is set as current voltage signal, and governor circuit goes out turbidity value according to current voltage signal primary Calculation, if primary Calculation
Turbidity value out is greater than 200NTU, then needs to control range switch circuit and be switched to transmission beam method gear, that is, connects and two pole of photoelectricity
The light emitting diode of pipe face, the light that light emitting diode issues is transmitted into photodiode through solution to be measured, by two pole of photoelectricity
Pipe induces electric current again, which is converted into new mV magnitude voltage signals through I/V conversion circuit, this is new
Voltage signal enters governor circuit through filtering and amplifying circuit, pre-amplification circuit and A/D converter circuit again, and governor circuit is new by this
Voltage signal be set as current voltage signal；
(3) collected current temperature signal is sent into governor circuit, governor circuit by A/D converter circuit by temperature-compensation circuit
According to current voltage signal and Current Temperatures calculate it is temperature compensated after turbidity value；
(4) turbidity value is sent to human-computer interaction interface through telecommunication circuit and shows.
8. application method according to claim 7, it is characterised in that: in step (2), control light-emitting diodes by PWM
The luminous frequency of pipe；Photodiode work is under guided optical mode；I/V conversion circuit is high-gain in 90 ° of scattering methods, saturating
It is low gain when penetrating method.
9. application method according to claim 7, it is characterised in that: filtered in governor circuit calculating process using sliding average
Wave is filtered data, and circuit board is filtered using LC π type filtering mode.
10. application method according to claim 7, it is characterised in that: the system kernel that governor circuit is selected is to grasp in real time
Make system FreeRTOS, FreeRTOS task include initialization task, communication task, turbidity acquisition tasks, temperature acquisition task,
Data processing task, data store tasks and data show task, are united by FreeRTOS task dispatcher according to task priority
One scheduling.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987876A (en) * | 2019-12-24 | 2020-04-10 | 上海蓝长自动化科技有限公司 | Wide-range optical turbidity detection equipment and detection method thereof |
| CN111089862A (en) * | 2019-12-31 | 2020-05-01 | 中国科学院合肥物质科学研究院 | Standard turbidity calibration device and method for extreme environment |
| CN111239079A (en) * | 2020-03-09 | 2020-06-05 | 上海交通大学 | Time-varying turbid field simulation device with fixed optical depth |
| CN113035894A (en) * | 2021-03-03 | 2021-06-25 | 京东方科技集团股份有限公司 | Image sensor, manufacturing method thereof and display device |
| CN111089862B (en) * | 2019-12-31 | 2024-06-04 | 中国科学院合肥物质科学研究院 | Standard turbidity calibration device and calibration method for extreme environment |
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