CN205958443U - Turbidity measuring circuit - Google Patents
Turbidity measuring circuit Download PDFInfo
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- CN205958443U CN205958443U CN201620884078.9U CN201620884078U CN205958443U CN 205958443 U CN205958443 U CN 205958443U CN 201620884078 U CN201620884078 U CN 201620884078U CN 205958443 U CN205958443 U CN 205958443U
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Abstract
The utility model discloses a turbidity measuring circuit, it includes: central processing unit, central processing unit electricity connect in constant current control module, and the lamp in white light LED is connected to constant current control module electricity, and white light LED lamp sees through a optical structure and acts on a signal reception module, signal reception module coupling in electric current voltage conversion module, signal after the conversion of electric current voltage conversion module is carried extremely after a signal amplification module central processing unit. The utility model discloses a turbidity measuring circuit, it adopts white light LED lamp as the light source, one -level silicon optical diode is as signal receiving unit, make it produce stable luminance through constant current control module control white light LED lamp, take differential amplification circuit behind signal reception, interference suppression, then use circuit ground to carry out the AD sampling as the reference, the PGA who utilizes AD chip carries out the ride gain makes it reach the high and stable effect of resolution ratio, effectively restrained and measured unstable influence under drift and the low turbidity.
Description
Technical field
This utility model is related to transmissometer technical field, especially a kind of turbidity measuring circuit for transmissometer.
Background technology
In field of measuring technique, there is a kind of turbidimetry being specifically designed for liquid, to obtain fluid characteristics parameter.
And existing transmissometer light source on the market typically adopts tungsten lamp and LED two schemes, in processing of circuit, often
Because it is big to process null offset that is improper and then showing, need frequently to return to zero, resolution is low, and in low turbidity situation
Lower extreme is unstable.Therefore, market is needed a kind of stable to low turbidity measurement, the little turbidimetry system of null offset badly.
Utility model content
The purpose of this utility model is to provide a kind of turbidity measuring circuit, which solves current turbidity measuring circuit zero point
Drift is big, the unstable technical problem of low turbidity measurement.
For reaching above-mentioned purpose, the technical scheme that this utility model is proposed is：
A kind of turbidity measuring circuit of the present utility model, it includes：Central processing unit, described central processing unit is electrically connected to
Constant-current control module, described constant-current control module is electrically connected to white LED lamp, and described white LED lamp passes through an optical texture and makees
For a signal receiving module, described signal receiving module is coupled in current/voltage-converted module, described current/voltage-converted
Signal after module conversion is delivered to described central processing unit after a signal amplification module；Described central processing unit controls described
Constant-current control module provides stable electric current for described white LED lamp, and the light of described white LED lamp passes through described optical texture
On solution to be measured after scatter to signal receiving module, described signal receiving module receives after the optical signal of scattering through described electricity
Change into the signal of telecommunication after stream/voltage transformation module, signal amplification module and be delivered to central processing unit, calculated by described central processing unit
Go out turbidity value.
Wherein, described described signal receiving module is silicon photo diode receiving circuit.
Wherein, described signal amplification module includes：One-level amplifying circuit and be coupled in described one-level amplifying circuit
Second amplifying circuit, described second amplifying circuit includes a digital regulation resistance being controlled by described central processing unit.
Wherein, described one-level amplifying circuit adopts differential amplifier circuit.
Wherein, described central processing unit also includes working power, and described working power includes powering for central processing unit
Digital power, and the analog power powered for described white LED lamp；Between wherein said digital power and analog power and ground
All it is in series with for anti-interference capacitor, between digital power and analog power, be electrically connected with the inductance for isolation.
Wherein, described constant-current control module includes：It is series at the Zener diode between power supply and ground and first resistor,
Described Zener diode two ends are parallel with an electric capacity, and the negative electrode of described Zener diode is also in series with a second resistance, and described
The outfan of two resistance is coupled in an operational amplifier and makes constant output current with short empty the breaking of void using described operational amplifier.
Wherein, the outfan of described operational amplifier is also electrically connected with switch three pole being controlled by central processing unit
Pipe.
Wherein, described silicon photo diode receiving circuit includes：Silicon photo diode, the anode of described silicon photo diode and the moon
Pole is electrically connected to the input of a difference amplifier respectively, and the input of described difference amplifier and outfan are also parallel with electric capacity
And resistance.
Wherein, the optical texture of this turbidity measuring circuit application is a smooth noise reduction scatterometry mechanism, and described smooth noise reduction dissipates
Penetrate measuring mechanism to include：Annular body, the annular sidewall of described annular body is provided with for injecting the white of white LED lamp white light
Optical channel, for installing the sense channel of silicon photo diode, and for suppressing the noise reducing mechanism of optical noise；Wherein above-mentioned white light
90 degree of central angles are differed, described noise reducing mechanism is located at the dead ahead of white light passage between passage and sense channel.
Compared with prior art, turbidity measuring circuit of the present utility model, it adopts white LED lamp as light source, one-level
Silicon photo diode, as signal receiving unit, controls white LED lamp to make it produce stable brightness by constant-current control module,
Signal takes differential amplifier circuit after receiving, suppression interference, is then with reference to carrying out AD sampling with circuit, using in A/D chip
The PGA in portion is controlled gain and reaches high resolution and stable effect, effectively inhibits under null offset and low turbidity
Measure unstable impact.
Brief description
Fig. 1 is the functional block diagram of turbidity measuring circuit of the present utility model.
Fig. 2 is the central processor section circuit diagram of turbidity measuring circuit of the present utility model.
Fig. 3 is the power supply partial circuit diagram of turbidity measuring circuit of the present utility model.
Fig. 4 is the constant-current control module partial circuit diagram of turbidity measuring circuit of the present utility model.
Fig. 5 is the silicon photo diode circuit part circuit diagram of turbidity measuring circuit of the present utility model.
Fig. 6 is the signal amplification module partial circuit diagram of turbidity measuring circuit of the present utility model.
Fig. 7 is that turbidity measuring circuit of the present utility model is applied to the light noise reduction scatterometry mechanism structure of turbidimetry and shows
It is intended to.
Specific embodiment
Below with reference to accompanying drawing, this utility model is given with further elaboration.
Refer to accompanying drawing 1 to accompanying drawing 6, in the present embodiment, this turbidity measuring circuit includes：Central processing unit 1, above-mentioned in
Central processor 1 is electrically connected to constant-current control module 2, and above-mentioned constant-current control module 2 is electrically connected to white LED lamp 3, above-mentioned white light
LED 3 acts on a signal receiving module 5 through an optical texture 4, and above-mentioned signal receiving module 5 is coupled in current/voltage and turns
Die change block 6, the signal after above-mentioned current/voltage-converted module 6 conversion is delivered to above-mentioned centre after a signal amplification module 7
Reason device 1, is wherein positioned over optical texture 4 for solution to be detected, is scattered.Above-mentioned central processing unit 1 controls above-mentioned
Constant-current control module 2 provides stable electric current for above-mentioned white LED lamp 3, and the light of above-mentioned white LED lamp 3 passes through above-mentioned optics
Signal receiving module 5 is scattered to, after above-mentioned signal receiving module 5 receives the optical signal of scattering after solution to be measured in structure 4
Change into the signal of telecommunication after above-mentioned current/voltage-converted module 6, signal amplification module 7 and be delivered to central processing unit 1, in above-mentioned
Central processor 1 calculates turbidity value according to turbidity algorithm.
Referring to accompanying drawing 2 and accompanying drawing 3, above-mentioned central processing unit 1 also includes working power, and above-mentioned working power includes
The digital power powered for central processing unit, this digital power is formed with inductance L1 left part circuit, and is above-mentioned white light
The analog power of LED 3 power supply, this analog power is formed with the right part circuit of inductance L1.Wherein above-mentioned digital power and
All it is in series between analog power and ground for anti-interference capacitor C5 and electric capacity C6, be electrically connected between digital power and analog power
It is connected to the inductance L1 for isolation.Power input, through inductance, isolates digital power and analog power, is then passed through U5, produce
More stable analog power.The interference of digital power so can be greatly reduced, improve power source performance, circuit is reduced on source
Noise.Equally, analog portion ground wire and numerical portion ground wire are isolated, and reduce circuit noise.
Referring to accompanying drawing 4, above-mentioned constant-current control module 2 includes：It is series at voltage stabilizing two pole between power supply and ground
Pipe U17 and first resistor R41, above-mentioned Zener diode U17 two ends are parallel with an electric capacity C18, the moon of above-mentioned Zener diode U17
Pole is also in series with second resistance R42, and the outfan of above-mentioned second resistance R42 is coupled in an operational amplifier U4 with using above-mentioned
Short empty the breaking of void of operational amplifier makes constant output current.Zener diode U17 is source of stable pressure, and operational amplifier U4, second
Resistance R42, produces mu balanced circuit jointly.Due to the effect of operational amplifier U4, the source of stable pressure of Zener diode U17, change
Become output in the constant-current source of diode D13, the electric current in circuit is together decided on by second resistance R42, Zener diode U17.This
The continuous current of sample, is input on diode D13 white LED lamp 3, the energy of white LED lamp 3 is more stable, and light beats is less.
Wherein, the outfan of above-mentioned operational amplifier U4 is also electrically connected with switch three pole being controlled by central processing unit
Pipe Q1, this switch triode is controlled by the opening and closing that central processing unit 1 automatically controls white LED lamp.
More specifically, refer to accompanying drawing 5, above-mentioned signal receiving module is silicon photo diode receiving circuit.Wherein, above-mentioned
Silicon photo diode receiving circuit include：Silicon photo diode D16, the anode of above-mentioned silicon photo diode D16 and negative electrode Electricity Federation respectively
It is connected to the input of a difference amplifier U2-A, the input of above-mentioned difference amplifier U2-A and outfan are also parallel with electric capacity
C32 and resistance R49.Receiving terminal receives optical signal by silicon photo diode D16, and by difference amplifier U2-A differential amplification, difference is put
Big circuit has good noise suppression feature, and therefore noise jamming is less.
Referring to accompanying drawing 6, above-mentioned signal amplification module 7 includes：One-level amplifying circuit and be coupled in above-mentioned one
The second amplifying circuit of level amplifying circuit, above-mentioned stage circuit includes difference amplifier U2-B, and above-mentioned second amplifying circuit includes
The one digital regulation resistance U11 being controlled by above-mentioned central processing unit 1, the amplification of this digital regulation resistance U11 is by central processing unit 1
Control, so that its signal reaches amplification and requires.Wherein, above-mentioned one-level amplifying circuit adopts differential amplifier circuit.Put by one-level
The signal of big output, through resistance R50, is input to the adjustable amplification in the second level, equally suppresses noise using differential amplification mode, then
Export ADC sampling A/D chip through VPD.Such circuit, light path is more stable, and noise jamming is little, therefore turbidimetry zero point drift
Move little, stable performance, particularly show especially prominent in the case of low turbidity.
Refer to accompanying drawing 7, the structural representation of its light noise reduction scatterometry mechanism for turbidity measuring circuit application.This light
Noise reduction scatterometry mechanism includes annular body 40, and the annular sidewall of annular body 40 is provided with white for injecting white LED lamp
The white light passage 42 of light, for installing the sense channel 41 of silicon photo diode, and for suppressing the noise reducing mechanism 43 of optical noise,
90 degree of central angles are differed, described noise reducing mechanism 43 is located at white light passage 42 between wherein above-mentioned white light passage 42 and sense channel 41
Dead ahead.
The above, preferred embodiment only of the present utility model, it is not intended to limit embodiment of the present utility model,
Those of ordinary skill in the art, according to central scope of the present utility model and spirit, can very easily carry out corresponding accommodation
Or modification, therefore protection domain of the present utility model should the protection domain required by by claims be defined.
Claims (9)
1. a kind of turbidity measuring circuit is it is characterised in that include：Central processing unit, described central processing unit is electrically connected to constant current
Control module, described constant-current control module is electrically connected to white LED lamp, and described white LED lamp acts on through an optical texture
One signal receiving module, described signal receiving module is coupled in current/voltage-converted module, described current/voltage-converted module
Signal after conversion is delivered to described central processing unit after a signal amplification module；Described central processing unit controls described constant current
Control module provides stable electric current for described white LED lamp, and the light of described white LED lamp passes through on described optical texture
Scatter to signal receiving module after solution to be measured, described signal receiving module receive after the optical signal of scattering through described electric current/
Change into the signal of telecommunication after voltage transformation module, signal amplification module and be delivered to central processing unit, calculated by described central processing unit
Turbidity value.
2. turbidity measuring circuit as claimed in claim 1 is it is characterised in that described signal receiving module is silicon photo diode
Receiving circuit.
3. turbidity measuring circuit as claimed in claim 1 is it is characterised in that described signal amplification module includes：One-level is put
Big circuit and the second amplifying circuit being coupled in described one-level amplifying circuit, described second amplifying circuit includes one and is controlled by institute
State the digital regulation resistance of central processing unit.
4. turbidity measuring circuit as claimed in claim 3 is it is characterised in that described one-level amplifying circuit adopts differential amplification
Circuit.
5. turbidity measuring circuit as claimed in claim 1 is it is characterised in that described central processing unit also includes working power,
Described working power includes the digital power powered for central processing unit, and the analog power powered for described white LED lamp；
All it is in series with for anti-interference capacitor, digital power and analog power between wherein said digital power and analog power and ground
Between be electrically connected with for isolation inductance.
6. turbidity measuring circuit as claimed in claim 1 is it is characterised in that described constant-current control module includes：It is series at
Zener diode between power supply and ground and first resistor, described Zener diode two ends are parallel with an electric capacity, described voltage stabilizing two
The negative electrode of pole pipe is also in series with a second resistance, and the outfan of described second resistance is coupled in an operational amplifier with using described
Short empty the breaking of void of operational amplifier makes constant output current.
7. turbidity measuring circuit as claimed in claim 6 is it is characterised in that the outfan of described operational amplifier is also electrically connected
It is connected to a switch triode being controlled by central processing unit.
8. turbidity measuring circuit as claimed in claim 2 is it is characterised in that described silicon photo diode receiving circuit includes：
Silicon photo diode, the anode of described silicon photo diode and negative electrode are electrically connected to the input of a difference amplifier, described difference respectively
The input of amplifier and outfan is divided also to be parallel with electric capacity and resistance.
9. turbidity measuring circuit as claimed in claim 1 is it is characterised in that the optical texture of application is a smooth noise reduction scattering survey
Measuring mechanism, described smooth noise reduction scatterometry mechanism includes：Annular body, the annular sidewall of described annular body is provided with for penetrating
Enter the white light passage of white LED lamp white light, for installing the sense channel of silicon photo diode, and for suppressing the fall of optical noise
Make an uproar mechanism；90 degree of central angles are differed, described noise reducing mechanism is located at white light passage between wherein above-mentioned white light passage and sense channel
Dead ahead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620884078.9U CN205958443U (en) | 2016-08-15 | 2016-08-15 | Turbidity measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620884078.9U CN205958443U (en) | 2016-08-15 | 2016-08-15 | Turbidity measuring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205958443U true CN205958443U (en) | 2017-02-15 |
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ID=57974673
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620884078.9U Active CN205958443U (en) | 2016-08-15 | 2016-08-15 | Turbidity measuring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053347A (en) * | 2016-08-15 | 2016-10-26 | 深圳市清时捷科技有限公司 | Turbidity measuring circuit |
-
2016
- 2016-08-15 CN CN201620884078.9U patent/CN205958443U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053347A (en) * | 2016-08-15 | 2016-10-26 | 深圳市清时捷科技有限公司 | Turbidity measuring circuit |
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