CN208206795U - A kind of WMS signal stabilization special circuit - Google Patents
A kind of WMS signal stabilization special circuit Download PDFInfo
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- CN208206795U CN208206795U CN201820465192.7U CN201820465192U CN208206795U CN 208206795 U CN208206795 U CN 208206795U CN 201820465192 U CN201820465192 U CN 201820465192U CN 208206795 U CN208206795 U CN 208206795U
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Abstract
A kind of WMS signal stabilization special circuit, comprising: photoelectric conversion circuit, programmable amplifying circuit I, high-pass filtering circuit, comparator and adjustable signal source.By the negative feedback of negative feedback loop, programmable amplifying circuit gain factor is controlled.When environmental factor (in addition to gas absorbs) changes, such as bent front ends optical fiber, it can find that deep fades can occur for the signal when WMS signal stabilization special circuit that the utility model is not added, after the MS signal stabilization special circuit of the utility model is added, as shown in the figure, when gain circuitry 0, the waveform of bent front ends optical fiber is without significant change.When front end signal reduces, the reduction of the high frequency modulated partial response in WMS spectrum signal after photoelectric conversion, so the signal into programme control circut B reduces.Due to the negative feedback of negative feedback loop, gain factor can be made to increase, and then compensate the fluctuation due to environmental factor bring transmission light optical power.
Description
Technical field
The utility model relates to field of gas detection, and in particular to a kind of WMS signal stabilization special circuit.
Background technique
The detection of minimum gas plays an important role in the supervision of industrial production and atmosphere.Minimum gas is made
Quickly detection can prevent the anti-life of disaster, reduce property loss.A kind of method of gas detection is exactly to pass through WMS, referred to as wave
Long modulated spectrum.Wavelength modulation spectroscopy can add a high-frequency carrier signal (generally sine and cosine to laser Injection Current simultaneously
Signal) and a low-frequency sweep signal (generally sawtooth signal or triangular signal), then have by lock-in amplifier
The harmonic component for selectively detecting specific frequency is calculated by the proportional relation of the amplitude of harmonic component and under test gas concentration
Under test gas concentration.
But Wavelength modulation spectroscopy detection sensitivity is by the restricted of extraneous factor, such as fibre-optical bending, temperature change.So
The influence for reducing extraneous factor is a major issue.Mostly at present is to use the means such as optical fiber curing, but greatly reduce biography
Defeated distance cannot tackle the problem at its root.There is the circuit of the fluctuation for reducing front end in the market, but is used for gas inspection
Survey field, it may appear that reaction speed is slow, phenomena such as no gain effect.
Summary of the invention
In order to overcome the shortcomings of the above technology, providing one kind can compensate by fibre-optical bending, temperature change the utility model
The non-absorbing losses of extraneous factors bring such as change, reduce the measurement error of system, improve the WMS letter of the precision of gasmetry
Number stable private circuit.
The utility model overcomes the technical solution used by its technical problem to be:
A kind of WMS signal stabilization special circuit, comprising:
Photoelectric conversion circuit receives the light that the laser of measurement gas issues, and it is electricity that optical signal, which is carried out photoelectric conversion,
Signal；
Programmable amplifying circuit I, input terminal are connected to the output end of photoelectric conversion circuit, and output end is connected to locking phase and puts
The input terminal of big circuit；
High-pass filtering circuit, input terminal are connected to the output end of photoelectric conversion circuit, and output end is connected to program-controlled put
The input terminal of big circuit I I；
Comparator, input terminal are connected to the output end and reference signal of programmable amplifying circuit II, output end
It is connected to the input terminal of detecting circuit；And
Adjustable signal source, output end are connected to the gain all the way of programmable amplifying circuit I and programmable amplifying circuit II
The another way gain control end of control terminal, programmable amplifying circuit I and programmable amplifying circuit II are all connected to the output of detecting circuit
End.
Above-mentioned programmable amplifying circuit I is made of AD603 chip, and the VINP pin of the AD603 chip is connected to photoelectricity and turns
The output end of circuit, COMM pin ground connection are changed, VNEG pin is connected to the cathode of power supply, the connection of VPOS pin
In the anode of power supply, VOUT pin and FDBK pin are all connected to the input terminal of locking phase amplifying circuit, GPOS pin
It is connected to the output end in adjustable signal source, GNEG pin is connected to the output end of detecting circuit.
Above-mentioned programmable amplifying circuit II is made of AD603 chip, and the VINP pin of the AD603 chip is connected to high pass filter
The output end of wave circuit, COMM pin ground connection, VNEG pin are connected to the cathode of power supply, the connection of VPOS pin
In the anode of power supply, VOUT pin and FDBK pin are all connected to the input terminal of comparator, and GPOS pin is connected to
The output end in adjustable signal source, GNEG pin are connected to the output end of detecting circuit.
Above-mentioned comparator includes AD8561 chip, and Vcc+ pin connects 5V positive pole, and Vcc- pin connects 5V electricity
Source cathode, GND pin and EN pin are grounded, and IN+ is connected to the output end of programmable amplifying circuit II, IN- pin warp
Resistance I is connected to the slide plate end of slide rheostat, and one end of slide rheostat is connected to 5V positive pole, and the other end is through resistance
It is grounded after II, the Qout pin of comparator is connected to the input terminal of detecting circuit.
Above-mentioned detecting circuit includes cache switching diodes, and described cache switching diodes one end is connected to the defeated of comparator
Outlet, the other end are connected to the gain control end of programmable amplifying circuit I and programmable amplifying circuit II all the way, and another way is through mutual
It is grounded after resistance III and capacitor in parallel.
Above-mentioned cache switching diodes are 1N4148 type cache switching diodes.
The beneficial effects of the utility model are: passing through programming amplifying electricity all the way from the superposed signal that photoelectric conversion circuit exports
Road I, another way after high-pass filtering circuit, be input to by adjustable signal source, detecting circuit, programmable amplifying circuit II and
The negative feedback loop that comparator is constituted.By the negative feedback of negative feedback loop, programmable amplifying circuit gain factor is controlled.When
When environmental factor (in addition to gas absorbs) changes, such as bent front ends optical fiber, it is found that the WMS signal that the utility model is not added is steady
Deep fades can occur for signal when determining special circuit, after the MS signal stabilization special circuit of the utility model is added, such as scheme
Shown, when gain circuitry 0, the waveform of bent front ends optical fiber is without significant change.When front end signal reduces, after photoelectric conversion
The reduction of high frequency modulated partial response in WMS spectrum signal, so the signal into programme control circut B reduces.Since negative-feedback is returned
The negative feedback on road can be such that gain factor increases, and then compensate the fluctuation due to environmental factor bring transmission light optical power.
Detailed description of the invention
Fig. 1 is the circuit connection diagram of the utility model；
Fig. 2 is the attachment structure schematic diagram of the AD603 chip of the utility model；
Fig. 3 is the electrical block diagram of the comparator of the utility model；
Fig. 4 is the structural schematic diagram of the detecting circuit of the utility model；
In figure, the inspection of 1. photoelectric conversion circuit, 2. programmable amplifying circuit I, 3. high-pass filtering circuit, 4. adjustable signal source 5.
9. locking phase amplifying circuit of wave circuit 6. programmable amplifying circuit II, 7. comparator, 8. reference signal, 10. resistance I 11. sliding becomes
Hinder 12. resistance II of device, 13. cache switching diodes, 14. resistance III, 15. capacitor.
Specific embodiment
1 the utility model is described further to attached drawing 4 with reference to the accompanying drawing.
A kind of WMS signal stabilization special circuit, comprising: photoelectric conversion circuit 1, the laser for receiving measurement gas issue
Light, by optical signal carry out photoelectric conversion be electric signal；Programmable amplifying circuit I 2, input terminal are connected to photoelectric conversion circuit 1
Output end, output end is connected to the input terminal of locking phase amplifying circuit 9；High-pass filtering circuit 3, input terminal is connected to photoelectricity
The output end of conversion circuit 1, output end are connected to the input terminal of programmable amplifying circuit II 6；Comparator 7, input terminal difference
It is connected to the output end and reference signal 8 of programmable amplifying circuit II 6, output end is connected to the input terminal of detecting circuit 5；
And adjustable signal source 4, output end are connected to the increasing all the way of programmable amplifying circuit I 2 and programmable amplifying circuit II 6
The another way gain control end of beneficial control terminal, programmable amplifying circuit I 2 and programmable amplifying circuit II 6 are all connected to detecting circuit 5
Output end.The superposed signal exported from photoelectric conversion circuit 1 passes through programmable amplifying circuit I 2 all the way, and another way passes through high pass
After filter circuit 3, be input to be made of adjustable signal source 4, detecting circuit 5, programmable amplifying circuit II 6 and comparator 7 it is negative
Feedback loop.By low frequency triangular wave and the superimposed signal of high_frequency sine wave, low-frequency component is filtered out through high-pass filtering circuit 3, it is high
The sine wave of frequency inputs programmable amplifying circuit II 6, an input of the output termination comparator 7 of programmable amplifying circuit II 6
The output at end, another input terminal input reference signal 8 of comparator 7, comparator 7 terminates detecting circuit 5, detecting circuit 5
Output end docks programmable amplifying circuit I 2 and programmable amplifying circuit II 6 and carries out gain control, by programmable amplifying circuit I 2 with
And 6 another way gain of programmable amplifying circuit II control is provided by adjustable signal source 4.By the negative feedback of negative feedback loop,
Control programmable amplifying circuit gain factor.When environmental factor (in addition to gas absorbs) changes, such as bent front ends optical fiber, can send out
Deep fades can occur for the signal when WMS signal stabilization special circuit of the utility model is now not added, when addition the utility model
MS signal stabilization special circuit after, when gain circuitry 0, the waveform of bent front ends optical fiber is without significant change.When front end signal subtracts
Hour, the reduction of the high frequency modulated partial response in WMS spectrum signal after photoelectric conversion, so into the signal of programme control circut B
Reduce.Due to the negative feedback of negative feedback loop, gain factor can be made to increase, and then compensated since environmental factor bring passes
Lose the fluctuation of optical power.
The utility model has the advantage that the utility model facilitates installation, and structure is simple.Pass through the feedback tune of loop
Section quickly can make gain control by earth signal, eliminate environmental change and the unstable influence of light source, larger in the temperature difference
Environment can also run, accuracy and high sensitivity, the response time is short, can monitor the concentration of gas in time, easy to operate.
Below by the WMS signal stabilization special circuit to the utility model to the detailed of gas chamber fixed gas Concentration Testing
Process is illustrated, the specific steps are as follows:
1) gas detecting system is connected, debugging optical path and circuit make its normal work, and under test gas pours gas chamber.Benefit
The sine wave of high frequency, all the way low frequency sawtooth all the way are issued with microprocessor, and the two-way wave of sending is input to electric current driving
Circuit carries out thermostatic control to Distributed Feedback Laser using temperature control circuit.At this moment, Distributed Feedback Laser can be emitted one of specific wavelength
A degree of decaying can occur after gas chamber for light, light.Adjust the temperature of input laser, thus it is possible to vary the position of absorption peak
It sets.
2) optical signal is changed into electric signal, cooperates subsequent journey by the light of laser emitting by light photoelectric conversion circuit 1
Control amplifying circuit I and programmable amplifying circuit II 6, available signal similar with original waveform.
3) it in the signal access locking phase amplifying circuit 9 exported photoelectric conversion circuit 1, is mentioned by multiplier and integrating circuit
Second harmonic can be obtained using subsequent filtering, amplifying circuit in the second harmonic for taking out deamplification.By the secondary humorous of extraction
Wave signal is input to the acquisition interface of microprocessor, and the voltage of harmonic spike can be obtained.It will acquisition, calculating and storage in program
Process repeats 500 times, is averaged, the concentration of real gas can be obtained in the formula for bringing fitting into.
4) signal that the yellow reference probe of oscillograph is connect to driving Distributed Feedback Laser, is placed in locking phase for blue exploratory probe
The input terminal of amplifier.Bent front ends optical fiber, it is found that deep fades occur for blue signal.
5) under test gas detection finishes, and closes power supply.
Programmable amplifying circuit I 2 can be made of AD603 chip, and the VINP pin of AD603 chip is connected to photoelectric conversion
The output end of circuit 1, COMM pin ground connection, VNEG pin are connected to the cathode of power supply, and VPOS pin is connected to
The anode of power supply, VOUT pin and FDBK pin are all connected to the input terminal of locking phase amplifying circuit 9, GPOS pin
It is connected to the output end in adjustable signal source 4, GNEG pin is connected to the output end of detecting circuit 5.The GPOS foot of AD603 and
GNEG foot is voltage gain control terminal, and VINP foot is signal input part, and the electric signal that photoelectric conversion circuit 1 exports passes through VINP foot
Be input to AD603 chip, FDBK foot is connected with VOUT foot, realize bandwidth be 90MHZ or 9MHZ may be selected, gain ranging for-
11dB to+31dB or+9dB to 51dB may be selected, so that the amplified signal of gain is transmitted to locking phase amplifying circuit 9.
Programmable amplifying circuit II 6 is made of AD603 chip, and the VINP pin of AD603 chip is connected to high-pass filtering circuit
3 output end, COMM pin ground connection, VNEG pin are connected to the cathode of power supply, and VPOS pin is connected to power supply
The anode of power supply, VOUT pin and FDBK pin are all connected to the input terminal of comparator 7, and GPOS pin is connected to adjustable
The output end of signal source 4, GNEG pin are connected to the output end of detecting circuit 5.The GPOS foot and GNEG foot of AD603 is electricity
Gain control end is pressed, VINP foot is signal input part, and the electric signal that high-pass filtering circuit 3 exports is input to by VINP foot
AD603 chip, FDBK foot are connected with VOUT foot, realize bandwidth be 90MHZ or 9MHZ may be selected, gain ranging be -11dB arrive+
31dB or+9dB to 51dB may be selected, so that the amplified signal of gain is transmitted to comparator 7.
Comparator 7 can be following structure comprising AD8561 chip, Vcc+ pin connect 5V positive pole,
Vcc- pin connects 5V power cathode, and GND pin and EN pin are grounded, and IN+ is connected to programmable amplifying circuit II's 6
Output end, IN- pin are connected to the slide plate end of slide rheostat 11, one end connection of slide rheostat 11 through resistance I 10
In 5V positive pole, the other end is grounded after resistance II 12, and the Qout pin of comparator 7 is connected to the input of detecting circuit 5
Holding AD8561 is a single channel 7ns comparator, has and individually outputs and inputs part.Individual power supply make input stage use ±
5V dual power supply power supply power supply, AD8561 have 7ns fast propagation delay performance.Rising signals and the propagation delay of dropping signal exist
Tight fit in entire temperature range, since the duty ratio of output will be matched with the duty ratio of input, this matching is prolonged
Slow characteristic makes AD8561 relatively be suitable for clock recovery.The pin arrangements of AD8561 are identical as LT1016, have lower power supply electricity
Stream and wider common-mode input range, contain negative supply rail.The rated temperature range of AD8561 is -40 DEG C to+85 DEG C industry
Temperature range provides 8 pin plastic DIP, 8 pin TSSOP or narrow body SO-8 surface mount package.By adjusting sliding variable resistance
The resistance value of device 11, realizes the change of the voltage value of the reference signal 8 of input AD8561 chip, and final realization comparator 7 adjusts defeated
The amplitude of signal out.
Detecting circuit 5 can be following structure comprising cache switching diodes 13,13 one end of cache switching diodes connect
It is connected to the output end of comparator 7, the other end is connected to the gain of programmable amplifying circuit I 2 and programmable amplifying circuit II 6 all the way
Control terminal, another way are grounded after resistance III14 and capacitor 15 parallel with one another.The signal exported from comparator 7 is opened at a high speed
Direct current signal is become to get to programmable amplifying circuit I's 2 and programmable amplifying circuit II 6 from AC signal after the diode 13 of pass
Control voltage.Antihypertensive effect is played in capacitor 15 and 14 parallel connection of resistance III.Preferably, cache switching diodes 13 are 1N4148
Type cache switching diodes.1N4148 is a kind of small-sized cache switching diodes, and switch is rapider, is widely used in signal frequency
The higher circuit of rate carries out one-way conduction isolation, communication, computer board, TV set circuit and industrial control circuit.
Claims (6)
1. a kind of WMS signal stabilization special circuit characterized by comprising
Photoelectric conversion circuit (1) receives the light that the laser of measurement gas issues, and it is telecommunications that optical signal, which is carried out photoelectric conversion,
Number；Programmable amplifying circuit I (2), input terminal are connected to the output end of photoelectric conversion circuit (1), and output end is connected to locking phase
The input terminal of amplifying circuit (9)；
High-pass filtering circuit (3), input terminal are connected to the output end of photoelectric conversion circuit (1), and output end is connected to program-controlled
The input terminal of amplifying circuit II (6)；
Comparator (7), input terminal is connected to the output end and reference signal (8) of programmable amplifying circuit II (6), defeated
Outlet is connected to the input terminal of detecting circuit (5)；And
Adjustable signal source (4), output end are connected to programmable amplifying circuit I (2) and programmable amplifying circuit II (6) all the way
The another way gain control end of gain control end, programmable amplifying circuit I (2) and programmable amplifying circuit II (6) are all connected to detection
The output end of circuit (5).
2. WMS signal stabilization special circuit according to claim 1, it is characterised in that: the programmable amplifying circuit I (2)
It is made of AD603 chip, the VINP pin of the AD603 chip is connected to the output end of photoelectric conversion circuit (1), COMM pipe
Foot ground connection, VNEG pin are connected to the cathode of power supply, and VPOS pin is connected to the anode of power supply, VOUT pipe
Foot and FDBK pin are all connected to the input terminal of locking phase amplifying circuit (9), and GPOS pin is connected to the defeated of adjustable signal source (4)
Outlet, GNEG pin are connected to the output end of detecting circuit (5).
3. WMS signal stabilization special circuit according to claim 1, it is characterised in that: the programmable amplifying circuit II (6)
It is made of AD603 chip, the VINP pin of the AD603 chip is connected to the output end of high-pass filtering circuit (3), COMM pipe
Foot ground connection, VNEG pin are connected to the cathode of power supply, and VPOS pin is connected to the anode of power supply, VOUT pipe
Foot and FDBK pin are all connected to the input terminal of comparator (7), and GPOS pin is connected to the output end of adjustable signal source (4),
Its GNEG pin is connected to the output end of detecting circuit (5).
4. WMS signal stabilization special circuit according to claim 1, it is characterised in that: the comparator (7) includes
AD8561 chip, Vcc+ pin connect 5V positive pole, and Vcc- pin connects 5V power cathode, GND pin and EN pipe
Foot is grounded, and IN+ is connected to the output end of (6) programmable amplifying circuit II, and IN- pin is connected to sliding through resistance I (10)
The slide plate end of rheostat (11), one end of slide rheostat (11) are connected to 5V positive pole, and the other end is through resistance II (12)
After be grounded, the Qout pin of comparator (7) is connected to the input terminal of detecting circuit (5).
5. WMS signal stabilization special circuit according to claim 1, it is characterised in that: the detecting circuit (5) includes height
Fast switching diode (13), described cache switching diodes (13) one end are connected to the output end of comparator (7), the other end one
Road is connected to the gain control end of programmable amplifying circuit I (2) and programmable amplifying circuit II (6), and another way is through electricity parallel with one another
Resistance III (14) and capacitor (15) are grounded afterwards.
6. WMS signal stabilization special circuit according to claim 5, it is characterised in that: the cache switching diodes
It (13) is 1N4148 type cache switching diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820465192.7U CN208206795U (en) | 2018-03-25 | 2018-03-25 | A kind of WMS signal stabilization special circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820465192.7U CN208206795U (en) | 2018-03-25 | 2018-03-25 | A kind of WMS signal stabilization special circuit |
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| CN208206795U true CN208206795U (en) | 2018-12-07 |
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| CN201820465192.7U Expired - Fee Related CN208206795U (en) | 2018-03-25 | 2018-03-25 | A kind of WMS signal stabilization special circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426857A (en) * | 2018-03-25 | 2018-08-21 | 济南大学 | A kind of WMS signal stabilizations special circuit |
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2018
- 2018-03-25 CN CN201820465192.7U patent/CN208206795U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426857A (en) * | 2018-03-25 | 2018-08-21 | 济南大学 | A kind of WMS signal stabilizations special circuit |
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Granted publication date: 20181207 Termination date: 20210325 |