CN207133193U - A kind of portable nitrogen peroxide optical detection apparatus - Google Patents
A kind of portable nitrogen peroxide optical detection apparatus Download PDFInfo
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- CN207133193U CN207133193U CN201720789582.5U CN201720789582U CN207133193U CN 207133193 U CN207133193 U CN 207133193U CN 201720789582 U CN201720789582 U CN 201720789582U CN 207133193 U CN207133193 U CN 207133193U
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- laser
- light intensity
- master control
- intensity sensors
- pond
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Abstract
The utility model discloses a kind of portable nitrogen peroxide optical detection apparatus, the device includes laser and its driving, air cavity pond, light intensity detector, master control set, power supply and display screen.It is characterized in that：The driving of laser makes laser produce laser, and laser divides two-way, and the air cavity pond of injection storage gas to be detected is directly connected in the wall multiple reflections of air cavity pond two, finally injection air cavity pond through light intensity detector, another way with light intensity detector all the way.Detector detection data returns to master control set, and master control set driving display screen shows gas concentration, and power supply is powered to whole device.The present apparatus is high using optical detecting method detection gas measurement accuracy, easy to operate to be applicable to industrial trace gas detection, chemical reaction research and atmospheric trace gas measurement.
Description
Technical field
A kind of optical detection apparatus is the utility model is related to, specially a kind of portable nitrogen peroxide optical detection apparatus.
Background technology
The light source that usual cavity-type BPM absorption spectroscopy techniques (CRDS), cavity reinforced absorption spectrum technology (CEAS) use all is narrow
Band light source, tuning range is in several wave numbers or so, and for the one turn of spectrum that shakes, absorption line line width is narrower, and characteristic spectral line is brighter
Aobvious, during as spectrographic detection, selectivity is preferably.But for N03 etc free radical molecule, content is very low in air, typically
For pptv magnitudes, its one turn of absorption intensity of shaking is very weak, in actual detection is detected using electron Spectrum, and electron Spectrum absorption spectra
Line is wider, usually several nm, is far longer than the tunable range of the LASER Light Source used in usual CRDS, in order that with logical
For wide band absorption spectral line as normal CRDS methods detection, it is necessary to measure the ring-down time at several different wave lengths, measurement is several
Absorbing to exclude the interference of other material absorbings at different frequency.However, air is a complicated absorbing material and scattering
The mixture of material, change over time quickly, in order to obtain accurate result, be folded absorption and have to accurately to separate, need
The absorption of total material is recorded simultaneously.Therefore, non-coherent broad band cavity reinforced absorption spectrum technology is developed.Broadband chamber enhancing absorbs
Spectral technique can realize very long effective absorption optical path (~km magnitudes), broadband on the basis of very short chamber length (~1m)
The use of light source can realize multi-component material while measure that detectivity is high, and detection time is very fast, can measure small
The time of material concentration, space two-dimensional change, are provided for correlative studys such as Atmospheric Trace detection and Atmospheric Chemistries in range scale
One good detection method.
The content of the invention
The purpose of this utility model is to provide a kind of portable nitrogen peroxide optical detection apparatus, and the present apparatus uses optics
Detection method detection gas measurement accuracy is high, it is easy to operate be applicable to industrial trace gas detection, chemical reaction research and
Atmospheric trace gas measures.
Technical scheme is used by the utility model solves its technical problem：A kind of portable nitrogen peroxide optical detection
Device, it is main to include collimation head, convex lens, diaphragm, optical fiber, optical cavity pond, CCD light intensity sensors, laser and its driving, master control
Device and power supply；It is characterized in that：Laser and its driving, master control set and power supply are located at optical cavity pond side, concavees lens, diaphragm
Coaxial with optical cavity pond, diaphragm is located at concavees lens focal point and is placed in optical cavity pond light inlet, and collimation head is located at convex lens opposite side
Focus, CCD light intensity sensors are located at the light-emitting window in optical cavity pond；Master control set is connected with CCD light intensity sensors and controls CCD light intensity
Sensor, described optical fiber from laser draw, divide two-way, all the way with collimation head be connected, all the way directly with CCD light intensity sensors
Connection.
CCD light intensity sensors described in the utility model include CCD light intensity sensors module, enter hole and laser enters hole；Enter
The light that hole and laser enter hole collection is respectively coupled on two photo-sensitive cells of CCD light intensity sensors through optical fiber.
Master control set described in the utility model includes main control chip, temperature sensor, button, OLED display screen；It is special
Sign is：Temperature sensor, button and OLED display screen are separate and are connected with main control chip.
The driving of laser described in the utility model makes laser produce laser, and laser divides two-way, injected all the way through optical fiber
The air cavity pond of gas to be detected is deposited in the wall multiple reflections of air cavity pond two, finally projects air cavity pond through light intensity detector, another way
Directly it is connected through optical fiber with light intensity detector.Detector detection data returns to master control set, and master control set driving shows screen display
Show light intensity and gas concentration, power supply is powered to whole device.
Laser described in the utility model uses tunable Distributed Feedback Laser (centre wavelength 612nm), and its driving includes
The current source of temperature control, temperature control use PTC5000 modules, and current source uses LDD-400 modules.The light that Distributed Feedback Laser is sent is direct
It is coupled to a diameter of 500 μm, numerical aperture is in 0.22 silica fibre, then converges to intracavitary by f=70mm lens.It is small
Hole diaphragm is used for filtering veiling glare and suppresses high-order transverse mode.
Air cavity pond described in the utility model is cubic container, and top and bottom are provided with passage, inputted above right side for laser
Hole, left side lower section is laser delivery outlet.The wall of left and right two is using the reflectivity position 99.995% being parallel to each other apart from the flat of position 60cm
Concave mirror makes laser be reflected in two walls.
Light intensity detector described in the utility model uses linear CCD light-intensity test module, measures what laser was sent respectively
Laser intensity and the laser intensity reflected from air cavity pond.Linear CCD light-intensity test module is connected with master control set, by leading
The light intensity collected is simultaneously returned to master control set by control device driving collection light intensity.
Master control set described in the utility model includes STM32F103 chips, temperature sensor and key-press input, and display screen is adopted
Gas concentration after showing the numerical value of CCD light intensity sensors return with OLED and being handled according to numerical computations.Wherein gas concentration
Calculation formula be：Wherein To is absolute temperature, and T is Current Temperatures, and Io is laser
Light intensity, I are the light intensity behind optical cavity pond, and L grows for chamber, and E is absorption cross-section.To, L and E are, it is known that T, I and Io can be measured.
The utility model has the advantages that：A kind of simple device detection trace gas is provided, its portable and high accuracy is special
Point can apply the research of air and chemical reaction.
Brief description of the drawings
Fig. 1 is structure chart of the present utility model.
Fig. 2 is partial, detailed view one of the present utility model.
Fig. 3 is partial, detailed view two of the present utility model.
Fig. 4 is partial, detailed view three of the present utility model.
In figure, 1 is defined straight peen, and 2 be convex lens, and 3 be diaphragm, and 4 be optical cavity pond, 5CCD light intensity sensors, 6. master controls dress
Put 7,8 optical fiber of laser and its driving, 9 power supplys, 5.1CCD light intensity sensors 5.2 enter the laser of hole 1 5.2 and enter the master control of hole 2 6.1
The temperature controller of 6.2 temperature sensor of chip, 6.3 7.2 laser of button 6.4OLED 7.1 current sources of display screen 7.3
7.4 collimation heads.
Embodiment
As Figure 1-4, a kind of portable nitrogen peroxide optical detection apparatus, it is main to include collimating first 1, convex lens 2, light
Door screen 3, optical cavity pond 4, CCD light intensity sensors 5, laser and its driving 7, the optical fiber 8 of master control set 6 and power supply 9；It is characterized in that：
Laser and its driving, master control set and power supply are located at optical cavity pond side, and concavees lens, diaphragm and optical cavity pond are coaxial, and diaphragm is located at
Concavees lens focal point is simultaneously placed in optical cavity pond light inlet, and collimation head is located at convex lens opposite side focus, and CCD light intensity sensors are located at
The light-emitting window in optical cavity pond.Master control set is connected with CCD light intensity sensors and controls CCD light intensity sensors.Power supply power supply to the device.
CCD light intensity sensors described in the utility model include CCD light intensity sensors module, enter hole and laser enters hole；Enter
The light that hole and laser enter hole collection is respectively coupled on two photo-sensitive cells of CCD light intensity sensors through optical fiber.
Master control set described in the utility model includes main control chip, temperature sensor, button, OLED display screen；It is special
Sign is：Temperature sensor, button and OLED display screen are separate and are connected with main control chip.
Laser sensor machine described in the utility model driving includes tunable Distributed Feedback Laser, and (centre wavelength is
612nm), PTC5000 temperature control modules, the current source modules of LDD -400, fiber coupler；It is characterized in that：Current source and
Temperature control module is connected with Distributed Feedback Laser, and the light that laser is sent is transferred to optical fiber through fiber coupler.
Operation principle of the present utility model is：Resonance, light intensity are produced after into optical cavity pond
Wherein I is the light intensity I for projecting chamber pond0To inject light intensity, R is plano-concave specular reflectivity, and α is the absorption coefficient L of gas
Grown for chamber.Cause assuming that loss by one path (1-L) is only absorbed by the linear Bill of lambert one, then (1-L)=exp (- α L).Absorb system
Several mouthfuls can be write as following form：It is anti-when plano-concave mirror
The rate R of penetrating is intended to absorption coefficient when 1Again because it is point that the definition of absorption coefficient, which is α=N × E N,
Subnumber density, E are absorption cross-section.Relation be present with gas concentration again in gas molecule number density.Three oxidations are obtained after inverting
Nitrogen bulk concentration
Wherein T0For absolute temperature T Current Temperatures, E can be determined gas to be detected being passed through air cavity pond by chamber pond characteristic
In, the laser for making laser produce wavelength stabilization is turned on the power, connection optical fiber makes laser be shining into air cavity pond.CCD light intensity senses
Device and the outlet of air cavity pond are fixed, and master control set driving display screen shows the light intensity of measurement and gas concentration to be detected, master control dress
The temperature of temperature sensor collection in putting is directly used in the calculating of concentration.The utility model strengthens using incoherent chamber
Optical detecting method, and it is related to the control and communication of 32 single-chip microcomputers.Detection gas measurement accuracy is high, easy to operate to be applicable to
Industrial trace gas detection, chemical reaction research and atmospheric trace gas measurement.
Claims (4)
1. a kind of portable nitrogen peroxide optical detection apparatus, it is main include collimation head, convex lens, diaphragm, optical fiber, optical cavity pond,
CCD light intensity sensors, laser and its driving, master control set and power supply；It is characterized in that：Laser and its driving, master control dress
Put and be located at optical cavity pond side with power supply, concavees lens, diaphragm and optical cavity pond are coaxial, and diaphragm is located at concavees lens focal point and is placed in light
Chamber pond light inlet, collimation head are located at convex lens opposite side focus, and CCD light intensity sensors are located at the light-emitting window in optical cavity pond；Master control fills
Put and be connected with CCD light intensity sensors and control CCD light intensity sensors, described optical fiber from laser draw, divide two-way, all the way with
Head connection is collimated, is directly connected all the way with CCD light intensity sensors.
A kind of 2. portable nitrogen peroxide optical detection apparatus according to claim 1, it is characterised in that：Described CCD
Light intensity sensor includes CCD light intensity sensors module, enters hole and laser enters hole；Enter hole and laser enters the light of hole collection through optical fiber
It is respectively coupled on two photo-sensitive cells of CCD light intensity sensors.
A kind of 3. portable nitrogen peroxide optical detection apparatus according to claim 1, it is characterised in that：Described master control
Device includes main control chip, temperature sensor, button, OLED display screen；Temperature sensor, button and OLED display screen are mutual
It is connected independently and with main control chip.
A kind of 4. portable nitrogen peroxide optical detection apparatus according to claim 1, it is characterised in that：Described laser
The driving of sensor machine includes tunable Distributed Feedback Laser, PTC5000 temperature control modules, the current source modules of LDD -400, light
Fine coupler；Current source and temperature control module are connected with Distributed Feedback Laser, and the light that laser is sent is transferred to light through fiber coupler
It is fine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720789582.5U CN207133193U (en) | 2017-06-30 | 2017-06-30 | A kind of portable nitrogen peroxide optical detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720789582.5U CN207133193U (en) | 2017-06-30 | 2017-06-30 | A kind of portable nitrogen peroxide optical detection apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN207133193U true CN207133193U (en) | 2018-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720789582.5U Expired - Fee Related CN207133193U (en) | 2017-06-30 | 2017-06-30 | A kind of portable nitrogen peroxide optical detection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443641A (en) * | 2018-04-02 | 2018-08-24 | 上海海洋大学 | A kind of pneumatic type bionic soft pipe robot |
| CN109060691A (en) * | 2018-09-04 | 2018-12-21 | 深圳市卡普瑞环境科技有限公司 | A kind of calculation method and equipment of atmospheric molecule concentration |
-
2017
- 2017-06-30 CN CN201720789582.5U patent/CN207133193U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443641A (en) * | 2018-04-02 | 2018-08-24 | 上海海洋大学 | A kind of pneumatic type bionic soft pipe robot |
| CN109060691A (en) * | 2018-09-04 | 2018-12-21 | 深圳市卡普瑞环境科技有限公司 | A kind of calculation method and equipment of atmospheric molecule concentration |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180323 Termination date: 20180630 |