CN109696404A - Portable multi-channel detector - Google Patents
Portable multi-channel detector Download PDFInfo
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- CN109696404A CN109696404A CN201711041155.XA CN201711041155A CN109696404A CN 109696404 A CN109696404 A CN 109696404A CN 201711041155 A CN201711041155 A CN 201711041155A CN 109696404 A CN109696404 A CN 109696404A
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- detection
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- portable multi
- detection cell
- probe head
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to the optical detecting instruments to poisonous and harmful substances in liquid, specially portable multi-channel detector.It is provided with the diode light-source of multiple and different wave bands, each diode light-source is combined with the matched filter plate of wave band therewith, detection cell is set after filter plate, for containing detected liquid, the optical signal that setting optical probe head will transmit through detection cell after detection cell is converted to corresponding stable voltage signal, optical probe head connects data collecting card (DAQ) or A/D conversion circuit realizes the processing of voltage signal, and the concentration information of determinand in unknown sample is determined according to the relation curve between the concentration of known determinand and voltage signal.Detector can acquire simultaneously the concentration information of a variety of (three kinds) target determinands under the conditions of real-time on-site, breach the limitation that traditional detection method can only carry out in laboratory conditions.With good portability, signal processing step is simple, testing result is accurate and reliable.
Description
Technical field
The present invention, which is devised, carries out the portable more of real-time, high-precision detection to poisonous and harmful substances a variety of in fluid sample
Air conduct measurement instrument.
Background technique
The mode of dissolubility poisonous and harmful substances includes that atomic absorption spectrography (AAS), atom are glimmering in existing detection water environment
Light photometry, near infrared spectroscopy, ion mobility spectrometry, nuclear-magnetism power resonance method, high performance liquid chromatography, mass spectrography, electrochemistry
[1-15] such as method, chrominance response method, Density Detection method, ultraviolet absorption method and fluorescence detections.Existing large-scale instrument analysis inspection
Survey method has many advantages, such as high-precision, high stability and high degree of automation.But large-scale instrument is faced with detecting instrument or equipment
Expensive, bulky, the problems such as operating process is relatively complicated, time-consuming.And it is not able to satisfy live real-time on-site detection need
It asks.Based on the above issues, research and develop a kind of portable, high-precision, the available small-sized detecting instrument of real-time on-site have it is extremely heavy
The meaning wanted.
Summary of the invention
Using existing poisonous and harmful substances under the conditions of detecting liquid as design premises, have developed one kind can be used for the present invention
The small-sized detecting instrument of portable multi-channel of soluble poisonous and harmful substances in real-time on-site analysis detection liquid environment, power
The limitation that traditional detection method of having sought to achieve breakthrough can only carry out in laboratory conditions.
Design scheme of the present invention: portable multi-channel detector, the detector are provided with the diode light of multiple and different wave bands
Source, each diode light-source are combined with the matched filter plate of wave band therewith, keep optical signal more stable.It is arranged after filter plate
Detection cell, for containing detected liquid.The optical signal that setting optical probe head will transmit through detection cell after detection cell is converted to
Corresponding stable voltage signal, optical probe head is electrically connected data collecting card (DAQ) or A/D conversion circuit realizes voltage signal
Processing, detection is determined according to the relationship (being obtained by analysis of experimental data) between the concentration of known determinand and voltage signal
The concentration of object；The data collecting card (DAQ) is handled by computer by being communicatively coupled with computer and shows testing result；
The A/D conversion circuit is electrically connected with microprocessor, by microprocessor processes data, and the display connected by microprocessor
Device shows testing result, and can externally transmit testing result by the communication module of microprocessor.
The detector electrical structure is divided into three layers, and bottom is instrument power supply unit, and middle layer is data processing circuit,
Including data collecting card and A/D conversion circuit, top layer is detection path, and sense channel has 3 tunnels, light source, and filter plate detects liquid,
Optical probe head is placed in detection path.
The diode light-source wavelength band is substantially consistent with through the detection optical signalling wave band of liquid, is placed horizontally at
In path channels.
The detection cell is formed using quartz material, is rectangular-shape, by the slip lid on instrument top layer
Opening is placed in detection path, and is higher by opening 2-3cm.
The optical probe head uses photoelectric sensor, carries out photoelectric conversion, there is high sensitivity, stable reaction speed
Degree, is placed horizontally in path channels, and the height of sensor is consistent with the detection cell height of sense channel is located at, and energy maximum limit is adopted
Optical signalling of the collection through detection liquid.
There is following two mode to handle the voltage signal of optical probe head output.
First, using 16 data collecting card acquisition analog voltage signals and being converted to digital signal, connected by USB line
Onto computer, the information of data collecting card output is read using standard modbus agreement using labview software.By having determined that
Transformational relation obtain the concentration of detectable substance, and with broken line graphics mode real-time display on the interface labview of computer.Data
The A/D conversion digit of capture card ensure that high measurement accuracy and can complete one-time detection task in 1.5 seconds.
Second, using the voltage signal for handling detecting head output based on the A/D Acquisition Circuit of stm32 chip, by ADC
Circuit obtains digital signal, then carries out calculation process by stm32 chip, corresponding with voltage value by fixed testing concentration
Relationship calculates the concentration of determinand, and with numeric form real-time display on liquid crystal display.
Instrument application method is simple, need to only will test and be packed into detection liquid in pond, is then placed on the reserved detection position of instrument
?.Detection liquid optical signalling change with the addition after poisonous and harmful substance, be presented as optical signalling enhancing or
Weaken, the degree that portable multi-channel detector is exactly based on detection change in optical signal reaches detection poisonous and harmful substance concentration
Purpose.After light source is through detection solution, optical signalling can change, optical probe head acquisition change after optical signal and be converted to pair
The voltage signal answered.The concentration that detectable substance in solution is obtained after data collecting card or the processing of A/D conversion circuit, passes through
Labview program interface or liquid crystal display real-time display, and data can be will test and be stored under the specified path of computer.Inspection
Survey instrument multiple optical paths are set, it can be achieved that many kinds of substance concentration real-time detection.
Portable multi-channel detector can acquire the concentration information of plurality of target detectable substance in multiple channels simultaneously, breach
The limitation that traditional detection method can only carry out in laboratory conditions.Can by virtual instrument program interface real-time display, meanwhile,
Data sampling and processing and liquid crystal screen display system based on SCM system can be used, detection process does not need the office such as computer
Equipment, portability are more preferable.Detector uses optical detector, receives the optical signal for penetrating detection cell, and be converted to corresponding electricity
Signal simplifies treatment process and accelerates processing speed so that signal processing step is simpler, accurate.Combining response wave band
Optical filter, the interference of veiling glare signal can be more efficiently reduced, to keep electric signal more stable.
Detailed description of the invention
Fig. 1 is portable multi-channel detector electrical block diagram；
Fig. 2 is portable multi-channel detector system principle schematic diagram；
Fig. 3 is portable multi-channel detector surface structure schematic diagram；
Appended drawing reference: 1 power switch, 2 USB interfaces, 3 liquid crystal displays, 4 detection cells, 5 constant voltage sources, 6 voltage reduction modules, 7 light
Source, 8 filter plates, 9 photoelectric sensors, 10 power module of voltage regulation, 11,12 microprocessor of data collecting card, 13 computers.
Specific embodiment
The invention will be further described with Figure of description combined with specific embodiments below.Specific reality described herein
Example is applied only to explain the present invention, is not intended to limit the present invention.
Embodiment: as shown in Figure 1 and Figure 2, four parts of portable multi-channel detector point, a part is constant voltage source, including
Constant voltage source 5 and voltage reduction module 6, for providing power supply to detector；Second part is bleeder circuit, by power module of voltage regulation 10
It powers for data collecting card 11 and A/D conversion circuit；Part III is light path part, shares three optical channels, each channel by
The microprocessor 12 of light source 7, optical filter 8, detection cell 4 and photoelectric sensor 9, data collecting card 11 and integrated A/D conversion circuit
Successively arrangement composition；Part IV is signal display portion, and detector can be arrived by the multiple Air conduct measurements of 3 real-time display of liquid crystal display
A variety of testing concentrations.Meanwhile detector can also be connected by USB line and computer 13, be shown by labview program interface
Collected multi-pass testing concentration information.Detector is divided into three layers from the bottom to top, and bottom is constant voltage source；Intermediate one layer is number
According to capture card and A/D conversion circuit；Top layer is light path part.Liquid crystal display is located at the right side of instrument, descends there are three key,
Control display of the individual channel on liquid crystal display.The appearance of detector is as shown in figure 3, be arranged power switch in side panel
1, USB interface 2 and liquid crystal display 3 are sliding lid construction, setting 3 detection cells 4, Chi Kou of installation in the top shell of detector
Expose tool housing, is detected liquid convenient for placing.
The light source of light path uses diode light-source, and wavelength band is substantially and through the optical signalling wave band one for detecting liquid
It causes, is placed horizontally in path channels.
Detection cell 4 is formed using quartz material, is rectangular-shape, is put by the opening on the slip lid on instrument top layer
It is placed in detection path, and is higher by opening 2-3cm.
Optical probe head uses photoelectric sensor, carries out photoelectric conversion, there is high sensitivity, and stable reaction speed is horizontal
It is placed in path channels, the height of sensor is consistent with the detection cell height of sense channel is located at, can maximum limit acquisition transmission
Detect the optical signalling of liquid.
The electricity that the processing of photosignal is exported optical detector using 16 data collecting cards or ADC acquisition circuit module
Pressure signal is converted to digital signal, then is handled by computer or stm32 chip, ensure that acquisition precision and signal processing speed
Degree, 1.5 seconds or so with regard to an achievable sampling process.It can real-time display in conjunction with Labview frame chart program or 32 SCM systems
The concentration information for detecting substance, meets the detection demand under the conditions of real-time on-site.
The power supply of external power supply 0-24V constant pressure source can be used in detector, and compact lithium cell power supply can also be used.Suitable for various
Based on the detection demand of optical signalling variation, including the optical bands such as ultraviolet, visible, infrared.Detector has a wide range of applications neck
Domain can be used for medical diagnosis, Drug monitoring, the detection of harmful substance and airport in water environment, the large size public arena pair such as station
Poisonous and harmful substance present in liquid is detected.
The analysis of the optical property of substance is converted to electric signal and analyzed by portable multi-channel detector, simplifies biography
The analytic process of system.Instrument has the characteristics that high-precision, portability, and has stronger portable and detection real-time.It adopts
Small in size with microprocessor architecture design, frame is made of ABS plate, and light-weight, stability is good, has stable chemical property
And corrosion resistance.Instrument has good smooth airtightness, can avoid the factors such as light, temperature and the electromagnetic interference in environment to detection
The influence of precision.Detector is with good expansibility, and it is different to realize that the part of different function is designed in instrument
Module, such as light source, filter plate, capture card, display screen etc. can be replaced according to actually detected demand, meet under different condition
The demand of measurement.For example, light source can select ultraviolet source, infrared light supply, visible light source according to the characteristic of determinand and detection liquid
Deng.
It is preferred embodiments of the present invention in summary, all changes made according to technical solution of the present invention, function produced
It is all belonged to the scope of protection of the present invention when can act on the range without departing from technical solution of the present invention.
Claims (5)
1. portable multi-channel detector, which is characterized in that the detector is provided with the diode light-source of multiple and different wave bands,
Each diode light-source is combined with the matched filter plate of wave band therewith, and detection cell is arranged after filter plate, tested for containing
Liquid is surveyed, the optical signal that setting optical probe head will transmit through detection cell after detection cell is converted to corresponding stable voltage letter
Number, optical probe head is electrically connected data collecting card (DAQ) or A/D conversion circuit realizes the processing of voltage signal, according to known
Relationship between the concentration and voltage signal of determinand determines the concentration of detectable substance；The data collecting card (DAQ) by with electricity
Brain is communicatively coupled, and is handled by computer and is shown testing result；The A/D conversion circuit is electrically connected with microprocessor, is passed through
Microprocessor processes data, and testing result is shown by the display that microprocessor connects, and the logical of microprocessor can be passed through
Letter module externally transmits testing result.
2. portable multi-channel detector according to claim 1, which is characterized in that the detector electrical structure point
It is three layers, bottom is instrument power supply unit, and middle layer is data processing circuit, including data collecting card and A/D conversion circuit, top
Layer is detection path, and sense channel has 3 tunnels, light source, and filter plate detects liquid, and optical probe head is placed in detection path.
3. portable multi-channel detector according to claim 1, which is characterized in that the diode light-source wave band model
Enclose substantially with through detection the optical signalling wave band of liquid it is consistent, be placed horizontally in path channels.
4. portable multi-channel detector according to claim 1, which is characterized in that the detection cell is using quartzy material
Material is made, and is rectangular-shape, is placed in detection path by the opening on the slip lid on instrument top layer, and be higher by opening
2-3cm。
5. portable multi-channel detector according to claim 1, which is characterized in that the optical probe head uses light
Electric transducer carries out photoelectric conversion, has high sensitivity, stable reaction speed is placed horizontally in path channels, sensor
Height is consistent with the detection cell height of sense channel is located at, optical signalling of the energy maximum limit acquisition through detection liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711041155.XA CN109696404A (en) | 2017-10-20 | 2017-10-20 | Portable multi-channel detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711041155.XA CN109696404A (en) | 2017-10-20 | 2017-10-20 | Portable multi-channel detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109696404A true CN109696404A (en) | 2019-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711041155.XA Pending CN109696404A (en) | 2017-10-20 | 2017-10-20 | Portable multi-channel detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487767A (en) * | 2019-09-03 | 2019-11-22 | 中国科学院重庆绿色智能技术研究院 | A kind of portable up-conversion fluorescence detector |
-
2017
- 2017-10-20 CN CN201711041155.XA patent/CN109696404A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487767A (en) * | 2019-09-03 | 2019-11-22 | 中国科学院重庆绿色智能技术研究院 | A kind of portable up-conversion fluorescence detector |
| CN110487767B (en) * | 2019-09-03 | 2022-03-25 | 中国科学院重庆绿色智能技术研究院 | Portable up-conversion fluorescence detector |
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