CN205719962U - A kind of humidity tester using laser - Google Patents
A kind of humidity tester using laser Download PDFInfo
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- CN205719962U CN205719962U CN201620396170.0U CN201620396170U CN205719962U CN 205719962 U CN205719962 U CN 205719962U CN 201620396170 U CN201620396170 U CN 201620396170U CN 205719962 U CN205719962 U CN 205719962U
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- laser
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- processor
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Abstract
This utility model provides a kind of humidity tester using laser, including: laser constant-current source circuit, for the pulse signal sent according to the processor of electrical connection, the laser instrument of electric current output to electrical connection through amplifying the different amplitude of formation；Laser instrument, for being controlled the laser signal sending different wave length through the gas treating measuring moisture by electric current；Wavelength screening circuit, including two branch roads, one of them branch road is Harmonic Method measuring circuit, and another branch road is straight ripple method measuring circuit；For receiving the laser signal after gas to be measured, it is delivered to said two branch road and processes；Described processor, for analyzing the laser signal after the said two branch road of electrical connection processes, draws humidity value.Compared with prior art, this utility model includes advantages below: simple in construction, and precision is high, it is possible to the humidity value that measuring amplitude scope is bigger.
Description
Technical field
This utility model relates to technical field of measurement and test, particularly relates to a kind of humidity measurement using laser
Instrument.
Background technology
The measuring principle of the humidity measurement equipment of current domestic use is broadly divided into electric chemical formula and dew-point
Measuring method, electrochemical measurement precision is poor, it is impossible to meet test moisture content accurately measures (volume
Ratio needs for ppm, i.e. 10-6).
Propose gaseous spectrum principle of absorption TDLAS technology for this for measuring, have developed into now
For the monitoring technology of trace gas in the sensitiveest and conventional air.TDLAS technology mainly profit
The characteristic changed with injection current with narrow linewidth and the wavelength of semiconductor laser with tunable realizes molecule
Single or several measure apart from the most indistinguishable close Absorption Line.This technology is typically with single narrow
Laser frequency one independent gaseous absorption line of scanning of band.In order to realize the highest selectivity, analyze one
As under low pressure carry out, at this moment Absorption Line will not be widened because of pressure.
Its main feature includes:
(1) high selectivity, high-resolution spectral technique, due to " fingerprint " feature of molecular spectrum, it
Do not disturbed by other gas.This characteristic has obvious advantage compared with other method.
(2) it be a kind of to all at all effective current techique of the infrared activist having an absorption, equally
Instrument can measure the instrument of other component the most instead, it is only necessary to change laser instrument and Standard Gases.
Due to this feature, it is easy to just can be made into measure multi-component instrument simultaneously.
(3) it has speed soon, highly sensitive advantage.In the case of the most malfunctioning sensitivity, its time
Resolution can be in ms magnitude.The major domain applying this technology has: molecular spectrum research, industry mistake
Journey Monitoring and Controlling, combustion process diagnostic analysis, engine efficiency and motor-vehicle tail-gas measurement, spark-test,
Trace contamination gas-monitoring etc. in air.
This technology for measuring, the product realized at present is varied, and structure is complicated.
Utility model content
Technical problem to be solved in the utility model carry be to provide a kind of simple in construction use laser
Humidity tester.
This utility model provides a kind of humidity tester using laser, including:
Laser constant-current source circuit, for the pulse signal sent according to the processor of electrical connection, Jing Guofang
The big electric current output laser instrument to electrical connection forming different amplitude；
Laser instrument, for being controlled the laser signal sending different wave length through the gas treating measuring moisture by electric current
Body；
Wavelength screening circuit, including two branch roads, one of them branch road is Harmonic Method measuring circuit, another
Individual branch road is straight ripple method measuring circuit；For receiving the laser signal after gas to be measured, it is delivered to institute
State two branch roads to process；
Described processor, the laser signal after the said two branch road according to electrical connection processes, draw
Humidity value.
Preferably, the electric power management circuit for power supply is also included.
Preferably, also include, the display screen being connected with described processor and button.
Preferably, also include: the memorizer for storing measurement data being connected with described processor.
Preferably, described laser constant-current source circuit includes: two-way is for amplifying putting of described pulse signal
Big branch road, every amplification branch road at least includes first amplifier；Article two, described amplification branch road is by the
Two amplifiers electrically connect described laser instrument；Described laser constant-current source circuit is also associated with feedback circuit.
Preferably, described wavelength screening circuit includes the 3rd amplifier；Described 3rd amplifier connects described
Harmonic Method measuring circuit, described Harmonic Method measuring circuit includes: filter capacitor, the 4th amplifier and two-way
The circuit of chip is processed containing Harmonic Method；
Described 3rd amplifier connects described straight ripple method measuring circuit, and described straight ripple method measuring circuit includes:
5th amplifier of multiple series connection.
Preferably, described amplifier is cmos operational amplifier；It is electricity that described Harmonic Method processes chip
Capacitor filter device.
Preferably, described processor is arm processor.
Compared with prior art, this utility model includes advantages below: simple in construction, and precision is high, it is possible to
The humidity value that measuring amplitude scope is bigger.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model；
Fig. 2 is the circuit diagram of the laser constant-current source circuit in embodiment；
Fig. 3 is the schematic diagram of Fig. 4, Fig. 5 combination；
Fig. 4 is wavelength screening circuit and straight ripple method measuring circuit and the circuit of fractional harmonic method measuring circuit
Figure；
Fig. 5 is the circuit diagram of Harmonic Method measuring circuit；
Fig. 6 is the another structured flowchart in embodiment.
Detailed description of the invention
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with
This utility model is described in further detail by the drawings and specific embodiments.
With reference to Fig. 1, it is shown that structured flowchart of the present utility model, including:
Laser constant-current source circuit, for the pulse signal sent according to the processor of electrical connection, Jing Guofang
The big electric current output laser instrument to electrical connection forming different amplitude；
Laser instrument, for being controlled the laser signal sending different wave length through the gas treating measuring moisture by electric current
Body；
Wavelength screening circuit, including two branch roads, one of them branch road is Harmonic Method measuring circuit, another
Individual branch road is straight ripple method measuring circuit；For receiving the laser signal after gas to be measured, it is delivered to institute
State two branch roads to process；
Described processor, the laser signal after the said two branch road according to electrical connection processes, draw
Humidity value.
By above-mentioned circuit structure, the measuring instrument of simple in construction can be realized.Certainty of measurement is accurate, measures
In extensive range.The concrete circuit structure used each circuit in embodiment below describes in detail.
Seeing Fig. 2, described laser constant-current source circuit includes: two-way is for amplifying described pulse signal
Amplifying branch road, every amplification branch road at least includes first amplifier；Article two, described amplification branch road passes through
Second amplifier electrically connects described laser instrument；Described laser constant-current source circuit is also associated with feedback circuit.
Wherein, two-way amplify branch road be respectively used to receive analogue signal DAC1 that sends of processor and
DAC2, wherein analogue signal DAC1 of a branch road realizes the fortune of signal through operational amplifier U8A
Put；Analogue signal DAC2 of another branch road is through operational amplifier U5A, operational amplifier U5B
Realize the amplifier of signal.Operational amplifier U5A, operational amplifier U5B and operational amplifier in figure
U8A is the first amplifier.
Article two, amplification branch road operational amplifier U7A and U7B in figure and audion
Q1M8050 exports to laser instrument.Operational amplifier U7A and U7B in figure is the second amplifier.Institute
State laser constant-current source circuit and be also associated with feedback circuit, figure i.e. comprises the feedback of the components and parts such as U8B
Circuit.
After laser instrument sends signal, through humidity gas to be measured to wavelength screening circuit；Wavelength screening electricity
As shown in Figure 4, Figure 5, dotted line is segmentation schematic lines on road, and Fig. 3 is Fig. 4 and the schematic diagram of Fig. 5 combination.
Preferably, described wavelength screening circuit includes the operational amplifier in the 3rd amplifier, i.e. Fig. 4
U13A；Described 3rd amplifier connects described Harmonic Method measuring circuit, described Harmonic Method measuring circuit bag
Include: filter capacitor, the 4th amplifier and two-way contain Harmonic Method and process the circuit of chip；
Filter capacitor is the C59 in figure, and the 4th amplifier is the operational amplifier U14B in Fig. 4.Humorous
Ripple method processes the circuit of chip and can be found in Fig. 5, and it is wave filter MAX7491 that Harmonic Method processes chip, and two
Road is contained Harmonic Method and is processed the circuit of chip, after processing laser signal respectively, through respective CMOS
Merge after operational amplifier U11A and U11B output, then input to processor.
Described 3rd amplifier connects described straight ripple method measuring circuit, and described straight ripple method measuring circuit includes:
5th amplifier of multiple series connection.5th amplifier is the cmos operational amplifier in Fig. 4, including
Operational amplifier U16A, operational amplifier U16B.
Preferably, above-mentioned amplifier is cmos operational amplifier, and described processor is at ARM
Reason device.
See Fig. 6, it is preferable that measuring instrument also includes the electric power management circuit for power supply.Specifically include
USB charge management module, battery and power management in figure.
Preferably, measuring instrument also includes, the LCD display being connected with described processor and button.
Preferably, measuring instrument also includes: the TF for storing measurement data being connected with described processor
Data storage.
Preferably, measuring instrument also includes: for thermometric temperature-measuring module, is used for controlling laser
The laser temperature control module of device temperature；
Laser wavelength absorption module, laser wavelength filtering algorithm module can be by the wavelength in embodiment
Screening circuit realizes.Laser wavelength tuner module, can use the laser constant-current source circuit in embodiment
Realize.In above-mentioned scheme, the method for measurement belongs to prior art, can be led by the chip in file
Enter existing analysis method, measuring method mentioned in background technology and file, bag can be realized
Include Harmonic Method, straight ripple method etc..Do not repeat them here.
Principle of the present utility model and embodiment are set forth by specific case used herein, with
The explanation of upper embodiment is only intended to help to understand method of the present utility model and core concept thereof；Meanwhile,
For one of ordinary skill in the art, according to thought of the present utility model, in detailed description of the invention and should
All will change with in scope, in sum, this specification content should not be construed as this practicality new
The restriction of type.
Claims (8)
1. the humidity tester using laser, it is characterised in that including:
Laser constant-current source circuit, for the pulse signal sent according to the processor of electrical connection, Jing Guofang
The big electric current output laser instrument to electrical connection forming different amplitude；
Laser instrument, for being controlled the laser signal sending different wave length through the gas treating measuring moisture by electric current
Body；
Wavelength screening circuit, including two branch roads, one of them branch road is Harmonic Method measuring circuit, another
Individual branch road is straight ripple method measuring circuit；For receiving the laser signal after gas to be measured, it is delivered to institute
State two branch roads to process；
Described processor, the laser signal after the said two branch road according to electrical connection processes, draw
Humidity value.
Humidity tester the most according to claim 1, it is characterised in that also include for powering
Electric power management circuit.
Humidity tester the most according to claim 1, it is characterised in that also include, with described
The display screen of processor connection and button.
Humidity tester the most according to claim 1, it is characterised in that also include: with described
The memorizer for storing measurement data that processor connects.
Humidity tester the most according to claim 1, it is characterised in that described laser constant-current
Source circuit includes:
Two-way is for amplifying the amplification branch road of described pulse signal, and every amplification branch road at least includes one the
One amplifier；
Article two, described amplification branch road electrically connects described laser instrument by the second amplifier；
Described laser constant-current source circuit is also associated with feedback circuit.
Humidity tester the most according to claim 1, it is characterised in that described wavelength screening electricity
Road includes the 3rd amplifier；
Described 3rd amplifier connects described Harmonic Method measuring circuit, and described Harmonic Method measuring circuit includes:
Filter capacitor, the 4th amplifier and two-way contain Harmonic Method and process the circuit of chip；
Described 3rd amplifier connects described straight ripple method measuring circuit, and described straight ripple method measuring circuit includes:
5th amplifier of multiple series connection.
7. according to the humidity tester described in claim 5 or 6, it is characterised in that described amplifier
For cmos operational amplifier；
It is remaining AC signal after electric capacity that described Harmonic Method processes circuit.
Humidity tester the most according to claim 1, it is characterised in that described processor is ARM
Processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620396170.0U CN205719962U (en) | 2016-05-04 | 2016-05-04 | A kind of humidity tester using laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620396170.0U CN205719962U (en) | 2016-05-04 | 2016-05-04 | A kind of humidity tester using laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205719962U true CN205719962U (en) | 2016-11-23 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620396170.0U Active CN205719962U (en) | 2016-05-04 | 2016-05-04 | A kind of humidity tester using laser |
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| CN (1) | CN205719962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086855A (en) * | 2019-06-13 | 2020-12-15 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
-
2016
- 2016-05-04 CN CN201620396170.0U patent/CN205719962U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086855A (en) * | 2019-06-13 | 2020-12-15 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
| CN112086855B (en) * | 2019-06-13 | 2022-11-01 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
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| GR01 | Patent grant |