CN208921615U - A kind of driving accurate photoelectric detector of modulating wave - Google Patents
A kind of driving accurate photoelectric detector of modulating wave Download PDFInfo
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- CN208921615U CN208921615U CN201821477418.1U CN201821477418U CN208921615U CN 208921615 U CN208921615 U CN 208921615U CN 201821477418 U CN201821477418 U CN 201821477418U CN 208921615 U CN208921615 U CN 208921615U
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Abstract
The utility model provides a kind of modulating wave driving accurate photoelectric detector, including LED light source, cuvette, silicon photocell, trans-impedance amplifier, capacitance, synchronous rectifier, analog/digital converter and single-chip microcontroller, the light that the LED light source issues generates alternating current on the silicon photocell after penetrating the cuvette, the trans-impedance amplifier receives alternating current and is amplified, the isolation capacitance receives amplified alternating current, and filter out direct current signal, the Digital Rectifier receives the alternating current after filtering out direct current signal and rectifies out direct current signal, the analog/digital converter receives direct current signal and converts thereof into digital signal, digital signal is carried out data processing by the single-chip microcontroller, sample is obtained in the cuvette to the corresponding current value of the absorption of different wavelengths of light, according to Beer law, calculate water outlet in oil content and The miscellaneous content of machine.
Description
Technical field
The utility model relates to semi-conductor photodetector technical fields, more particularly, to a kind of driving precision of modulating wave
Photoelectric detector.
Background technique
Currently, oil field water quality detection generallys use spectrophotometer to be detected, spectrophotometer testing principle is: by
The light that light source issues is divided into impartial symmetrical two beam of energy, and a branch of is sample light by sample, and another beam is reference light conduct
Benchmark.After this two-beam enters photometer by sample room, then two-beam is combined into a branch of, and is entered alternately through entrance slit
In monochromator, light beam is incident upon on grating in parallel through off-axis paraboloidal mirror, dispersion and by after exit slit, by optical filter
Senior sub-spectrum is filtered out, then is focused on the receiving plane of detector through ellipsoidal mirror.Detector is converted to above-mentioned signal accordingly
Electric signal is transferred to A/D conversion unit, is obtained after computer disposal from high wave number to low wave after amplifier carries out voltage amplification
Several infrared absorpting light spectras.
Such detection method is particularly suitable to be carried out in laboratory environment, and in test process, photoelectric device is needed acyclic
Border light regional work, since field condition is limited, is easy to be tested number by environment stray light in Oil Field test process
According to.The present invention provides a kind of modulating wave driving accurate photoelectric detector thus, solves the above technical problem.
Summary of the invention
The purpose of the utility model is to provide a kind of shadows of solution oil field detection field condition deficiency bring ambient light
A kind of driving accurate photoelectric detector of modulating wave of the problem of sound.
The purpose of this utility model can be achieved by the following technical measures:
The driving accurate photoelectric detector of the modulating wave include LED light source, cuvette, silicon photocell, trans-impedance amplifier, every
Straight capacitor, synchronous rectifier, analog/digital converter and single-chip microcontroller, the light which issues through after the cuvette
Alternating current is generated on the silicon photocell, which is connected to the silicon photocell, and it receives alternating current and is amplified,
The capacitance is connected to the trans-impedance amplifier, receives amplified alternating current, and filter out direct current signal, the synchronous rectifier
It is connected to the capacitance, receive the alternating current after filtering out direct current signal and rectifies out direct current signal, the analog/digital conversion
Device is connected to the synchronous rectifier, receives direct current signal and converts thereof into digital signal, which is connected to the simulation/number
Digital signal is carried out data processing by word converter, obtains in the cuvette sample to the corresponding electricity of the absorption of different wavelengths of light
Flow valuve calculates oil content and the miscellaneous content of machine in water outlet according to Beer law.
The purpose of this utility model can be also achieved by the following technical measures:
The photoelectric detector further includes synchronous generator and current amplifier, which is connected to this
Single-chip microcontroller receives the square-wave signal that the single-chip microcontroller transmits, and same phase/inversion signal is exported after square-wave signal is handled,
To control the work of the current amplifier, which is connected between the synchronous generator and the LED light source, is connect
Same phase/inversion signal of synchronous generator generation is received, and drives the LED light source after being amplified, so that the LED light source
It shines.
The synchronous rectifier is connected to the synchronous generator, and the same phase exported by the synchronous generator/anti-
Phase signals driving.
The synchronous generator uses chip dsPIC30f4011, receives the square-wave signal that the single-chip microcontroller transmits,
By exporting same phase/inversion signal after XOR gate 74HC86,180 ° of phase difference between signal.
The square-wave signal that the single-chip microcontroller transmits is the square-wave signal of 4999Hz duty ratio 50.00%.
The photoelectric detector further includes man-machine interface, which is connected to the single-chip microcontroller, which is transmitted across
The data come are shown and are stored；Further include communication interface, which is connected to the single-chip microcontroller, for the single-chip microcontroller with it is upper
The connecting interface of position machine.
Photoelectric detector is modulated driving, photoemission using the effective modulating wave of photoemission in the utility model
Pipe works in exchange status, and the received light of photelectric receiver is also to be amplified again after capacitor with frequency with mutually exchanging, after
By being reduced into direct current signal with the synchronous rectifier of phase with frequency-with modulating wave, finally enters A/D converter and carry out number turn
It changes, in entire amplification process, only in the first order, there are environment shadows to ring, and only influences the dynamic range of amplifier, environment
Light shift value is filtered out by capacitor, and environment shadow can be ignored and ring.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment；
Fig. 2 is the circuit diagram of synchronous generator in the utility model embodiment；
Fig. 3 is the circuit diagram that current amplifier drives LED light source in the utility model embodiment；
Fig. 4 is the circuit diagram of trans-impedance amplifier amplification and capacitance in the utility model embodiment；
Fig. 5 is the circuit diagram of synchronous rectifier in the utility model embodiment.
Specific embodiment
To enable the above and other objects, features and advantages of the utility model to be clearer and more comprehensible, it is cited below particularly out preferably
Embodiment, and cooperate shown in attached drawing, it is described in detail below.
As shown in Figure 1, the photoelectric detector by synchronous generator 1, current amplifier 2, LED light source 3, cuvette 4,
Silicon photocell 5, trans-impedance amplifier 6, capacitance 7, synchronous rectifier 8, analog/digital converter 9, single-chip microcontroller 10, man-machine boundary
Face 11 and communication interface 12 form.
Current amplifier 2 is connected between the synchronous generator 1 and the LED light source 3, the synchronous generator 1
The modulating wave of generation, which enters after current amplifier 2 amplifies, drives LED light source 3, so that LED light source 3 shines.2 energy of current amplifier
Accurate control 3 size of current of LED light source and dark current size make the operation of LED light source 3 keep stablizing.As shown in figure 3, A_adj,
B_adj is used to adjust separately the electric current that LED flows through sample resistance, digital switching is carried out by analog multichannel switch AD633, after switching
Voltage value is sent to operational amplifier AD8618, is controlled triode 2SC1008 and is carried out Current amplifier.
Synchronous generator 1 is connected to single-chip microcontroller 10, as shown in Fig. 2, synchronous generator uses chip
DsPIC30f4011 receives the square-wave signal that single-chip microcontroller 10 transmits 4999Hz duty ratio 50.00%, passes through XOR gate
Exportable same phase/inversion signal after 74HC86,180 ° of phase difference between signal, output signal for control current amplifier 2 and
Synchronous rectifier 8 works asynchronously.
The light that LED light source 3 issues generates alternating current on silicon photocell 5 after penetrating cuvette 4.
Trans-impedance amplifier 6 is connected to silicon photocell 5, receives alternating current and is amplified.
Capacitance 7 is connected to the trans-impedance amplifier 6, receives amplified alternating current, and filter out direct current signal.Such as figure
Shown in 4, D1 is silicon photocell 5, and U1A forms trans-impedance amplifier 6, amplifies the weak current received, through C4 capacitance blocking
Afterwards, impedance transformation is carried out by U1B, eliminates influence of the rear class to prime working condition.
Synchronous rectifier 8 is connected to the capacitance 7, receives the alternating current after filtering out direct current signal and rectifies out direct current
Signal.Synchronous rectifier 8 is also attached to the synchronous generator 1, and is driven by the synchronous generator 1.Such as Fig. 5 institute
Show, by controlling analog switch U6, occurs that amplifier U9 synchronous conversion, amplification factor in same phase/reverse phase magnifying state not
Change, since drive analog switch signal and LED drive with the same phase of frequency, realizes synchronous rectification.
Analog/digital converter 9 is connected to the synchronous rectifier 8, receives direct current signal and converts thereof into digital signal.
Single-chip microcontroller 10 is connected to analog/digital converter 9, and digital signal is carried out data processing, digital signal is carried out
Data processing obtains sample in the cuvette and is calculated to the corresponding current value of the absorption of different wavelengths of light according to Beer law
Oil content and the miscellaneous content of machine in water.Single-chip microcontroller 10 gathers sortord using section, and according to value section is divided into not data in data packet
With set, CPU according to gather in data bulk how much determine using which set volume data, then by this set volume data carry out it is flat
Sliding filtering obtains required result.
Man-machine interface 11 is connected to single-chip microcontroller 10, and the data that single-chip microcontroller 10 transmits are shown and stored.
Communication interface 12 is connected to single-chip microcontroller 10, is the connecting interface of single-chip microcontroller 10 and host computer.
The driving accurate photoelectric detector of the modulating wave of the utility model, single-chip microcontroller 10 issue test command, synchronization signal
Generator 1 is started to work, and signal will drive LED light source 3 by current amplifier 2 all the way after Current amplifier, and another way signal drives
Dynamic synchronous rectifier 8,8 prime of synchronous rectifier are silicon photocell 5+ trans-impedance amplifiers 6, are filtered after signal amplification through capacitance 7
Except DC offset signal, cause the mainly environment stray light of direct current offset.8 output signal of synchronous rectifier send to simulation/
Digital quantizer 9 is digitized, and by 10 table lookup operations of single-chip microcontroller, extrapolates required numerical value, the display of man-machine interface 11 is worked as
Preceding value and storing data, communication interface 12 are that the completion of RS485 interface is communicated with host computer.
Oil-containing and suspension analyte detection are made of the above separate circuit module in water, 6 amplification factor of trans-impedance amplifier not phase
Together.
The utility model is modulated driving using the effective modulating wave of photoemission, and photoemission cell work is exchanging
State, the received light of photelectric receiver are also to be amplified again after capacitor blocking, led to after amplification with mutually exchanging with frequency-
It crosses and is reduced into direct current signal with the synchronous rectifier of phase with frequency-with modulating wave, finally enter analog/digital converter and carry out number
It converts, in entire signal amplification process, only in the first order, there are environment shadows to ring, and only influences the dynamic duty of amplifier
Range, environment light shift value are filtered out by capacitor, therefore, environment shadow can be ignored and ring.
Claims (7)
1. a kind of driving accurate photoelectric detector of modulating wave, which is characterized in that the photoelectric detector includes LED light source, colorimetric
Ware, silicon photocell, trans-impedance amplifier, capacitance, synchronous rectifier, analog/digital converter and single-chip microcontroller, the LED light source
The light of sending generates alternating current on the silicon photocell after penetrating the cuvette, which is connected to the silicon photoelectricity
Pond receives alternating current and is amplified, which is connected to the trans-impedance amplifier, receives amplified alternating current,
And direct current signal is filtered out, which is connected to the capacitance, receives the alternating current after filtering out direct current signal and whole
Direct current signal is flowed out, which is connected to the synchronous rectifier, receives direct current signal and converts thereof into number
Signal, the single-chip microcontroller are connected to the analog/digital converter, and digital signal is carried out data processing, obtains sample in the cuvette
Product calculate oil content and the miscellaneous content of machine in water outlet according to Beer law to the corresponding current value of the absorption of different wavelengths of light.
2. a kind of driving accurate photoelectric detector of modulating wave according to claim 1, which is characterized in that the Photoelectric Detection
Device further includes synchronous generator and current amplifier, which is connected to the single-chip microcontroller, receives the monolithic
The square-wave signal that machine transmits exports same phase/inversion signal after being handled square-wave signal, to control the current amplifier
Work, which is connected between the synchronous generator and the LED light source, receives the synchronous generator
Same phase/the inversion signal generated, and the LED light source is driven after being amplified, so that the LED light source shines.
3. a kind of driving accurate photoelectric detector of modulating wave according to claim 2, which is characterized in that the synchronous rectification
Device is connected to the synchronous generator, and is driven by same phase/inversion signal that the synchronous generator exports.
4. a kind of driving accurate photoelectric detector of modulating wave according to claim 2, which is characterized in that the synchronization signal
Generator uses chip dsPIC30f4011, the square-wave signal that the single-chip microcontroller transmits is received, after XOR gate 74HC86
Same phase/inversion signal is exported, 180 ° of phase difference between signal.
5. a kind of driving accurate photoelectric detector of modulating wave according to claim 2, which is characterized in that the single-chip microcontroller passes
The defeated square-wave signal to come is the square-wave signal of 4999Hz duty ratio 50.00%.
6. a kind of driving accurate photoelectric detector of modulating wave according to claim 1, which is characterized in that the Photoelectric Detection
Device further includes man-machine interface, which is connected to the single-chip microcontroller, the data which is transmitted carry out display and
Storage.
7. a kind of driving accurate photoelectric detector of modulating wave according to claim 1, which is characterized in that the Photoelectric Detection
Device further includes communication interface, which is connected to the single-chip microcontroller, for the connecting interface of the single-chip microcontroller and host computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821477418.1U CN208921615U (en) | 2018-09-10 | 2018-09-10 | A kind of driving accurate photoelectric detector of modulating wave |
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| CN201821477418.1U CN208921615U (en) | 2018-09-10 | 2018-09-10 | A kind of driving accurate photoelectric detector of modulating wave |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887793A (en) * | 2018-09-10 | 2020-03-17 | 中国石油化工股份有限公司 | Modulation wave driving type precision photoelectric detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887793A (en) * | 2018-09-10 | 2020-03-17 | 中国石油化工股份有限公司 | Modulation wave driving type precision photoelectric detector |
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