CN208795660U - Optical dissolved oxygen sensor original position self-calibrating device - Google Patents
Optical dissolved oxygen sensor original position self-calibrating device Download PDFInfo
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- CN208795660U CN208795660U CN201821081054.5U CN201821081054U CN208795660U CN 208795660 U CN208795660 U CN 208795660U CN 201821081054 U CN201821081054 U CN 201821081054U CN 208795660 U CN208795660 U CN 208795660U
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Abstract
The utility model belongs to dissolved oxygen sensor collimation technique field, disclose optical dissolved oxygen sensor original position self-calibrating device, including calibration gas generator and calibrating installation underwater portion, calibration gas generator includes saturated air bottle, High Purity Nitrogen gas cylinder, mass flow controller and de-watering apparatus, calibrating installation underwater portion includes calibration test case, the dissolved oxygen sensor to be calibrated being arranged in calibration test case and temperature, humidity and baroceptor, and calibration test case is equipped with water inlet, water outlet and gas access.It replaces solution to calibrate with gas calibration, simplifies the proportion process of different dissolved oxygen concentration gradient water body in solution, not only can simplify calibration process and save prover time, but also improve the precision of calibrated in situ benchmark oxygen concentration；The calibration gas of use is diffused into the pollution that not will cause atmosphere in air；Realize self calibration in situ, for promoting the quality of data of dissolved oxygen sensor in-situ monitoring, extending non-maintaining runing time in situ has important role.
Description
Technical field
The utility model relates to dissolved oxygen sensors to calibrate field, disclose a kind of self-correcting of optical dissolved oxygen sensor original position
Quasi- method and device.
Background technique
Dissolved oxygen be measure seawater quality superiority and inferiority, water body be contaminated degree important indicator, be in addition to temperature and salt are outside one's consideration,
Most important monitoring index in seawater can cause great influence to marine life activity and sea farming, be to carry out ocean life
The important evidence of state environmental assessment and Marine Sciences experiment.The measurement analysis of dissolved oxygen generally uses Winkler analysis method, but
It is that this method program is cumbersome, takes time and effort, it is often more important that, due to the limitation of erect-position setting time and funds, this non-reality
When, interrupted detection pattern be difficult to carry out ocean dissolved oxygen in time, effectively monitoring, can not be formed long-term continuous, large-scale
Oxidation data is dissolved in ocean, is less able to satisfy the requirement of marine environmental monitoring and early warning to data.Currently, ocean dissolved oxygen senses
The development of device Detection Techniques compensates for the deficiency of conventional detection method, and original position, the real-time monitoring of dissolved oxygen, but electrification may be implemented
Learning dissolved oxygen sensor needs reference electrode, and by dissolved oxygen, spreading factor is limited continuous mode in water, need to be molten to being tested
Liquid carries out constant speed stirring；Electrode is using certain energization activation time is preceding needed, and ventilated membrane also will be replaced often, and precision is poor,
Cause signal drift, therefore application of the electrochemical dissolution lambda sensor in terms of the dissolved oxygen monitoring of ocean vulnerable to the interference of electromagnetic field
It is limited by very large.Optical dissolved oxygen based on Fluorescence Quenching Principle pass in-situ monitoring technology with its measurement accurately and fast,
Highly selective, high stability, electromagnetism interference and the advantages that can remotely monitoring, overcome the deficiency on traditional dissolved oxygen sensing,
Continuous detection in situ can be achieved, be widely used in the in-situ monitoring of dissolved oxygen.
Although optical dissolved oxygen sensor has been widely used in various mobile and fixed monitoring platforms, and is dispatching from the factory
Before passed stringent calibration, but it is in situ in monitoring process since film can produce due to by photodegradation, biological attachment etc.
Raw data wander, it is therefore desirable to the accuracy and reliability to guarantee monitoring data is calibrated to it.But at present for molten
The universal calibration method of solution lambda sensor only has laboratory investment method, lacks optical dissolved oxygen sensor self-alignment side in situ
Method, and laboratory investment method calibration cycle is very long, it is time-consuming and laborious, it needs to fetch sensor land laboratory and carries out manually
Calibration, influences the continuity of dissolved oxygen sensor monitoring data, is unable to satisfy dissolved oxygen sensor in situ self-alignment urgent
It is essential and asks.Therefore, as the most important means of dissolved oxygen in-situ monitoring reliability and stability are ensured, it is therefore proposed that a kind of energy
Enough just become particularly important, the party suitable for the method for self-calibrating in situ of optical dissolved oxygen sensor and high-precision self-calibrating device
For the quality of data of promotion dissolved oxygen sensor in-situ monitoring, extension non-maintaining runing time in situ has important for method and device
Effect.
Utility model content
The purpose of this utility model is that in view of the above technical problems, providing a kind of self-correcting of optical dissolved oxygen sensor original position
Quasi- method and calibrating installation solve optical dissolved oxygen sensor in-situ monitoring data wander, influence the skill of accuracy and reliability
Art problem.
It is achieved in order to solve the above technical problems, adopting the following technical solutions.
Optical dissolved oxygen sensor original position self-calibrating device, it is real including the sea water circulating pump 20 that is placed in seawater, calibration
Tryoff 21, dissolved oxygen sensor to be calibrated 22, temperature sensor, humidity sensor, the air pressure transmission being placed in calibration experiments case 21
Sensor；Calibration experiments case 21 is pressure-resistant, the corrosion resistant container of open on three sides, and side is equipped with seawater inlet and seawer outlet, preceding
Person and sea water circulating pump 20 are by piping connection, and the latter is as seawater and gas vent；The opening at top is as calibration gas
Entrance connect between 1 three of triple valve and calibration gas generator with tracheae 28 for calibrating dissolved oxygen sensor；It sets
Calibration gas generator 1 inside fixation/mobile platform；Be placed in saturated air bottle 10 inside calibration gas generator 1,
13, two solenoid valves of the mass flow controller of pressure reducing valve 12, two of High Purity Nitrogen gas cylinder 11, two, pressure sensor 16, water removal dress
17 are set, two external triple valves are placed in, for controlling gas circuit flow direction.Water inlet 23 passes through the bracket of fixed calibration experimental box,
Dissolved oxygen sensor is fixed on calibration test case, can fully enter experimental box, can also only enter chamber a part, can
It is adjusted according to the size of calibration experiments case, need to only guarantee that optic probe is arranged in chamber.
Optical dissolved oxygen sensor original position method for self-calibrating, comprising the following steps:
(1) sea water circulating pump 20 is closed, the water inlet 23 of calibration experiments case 21 is closed, opens saturated air bottle 10, the
One solenoid valve 14 makes saturated air pass sequentially through pressure reducing valve 12, mass flow controller 13, baroceptor 16, de-watering apparatus
17, the first triple valve 18 enters calibration experiments case 21 through gas access 27, displaces seawater therein；
(2) it is full of calibration experiments case 21 to air, closes the water outlet 26 of calibration experiments case 21, close calibration experiments case
21, stopping is passed through air；
(3) temperature sensor indicating value in experimental box 21 to be calibrated is stablized, and records the temperature value, opposite of calibration gas respectively
Humidity value, atmospheric pressure value and optical dissolved oxygen sensor indicating value to be calibrated；
(4) it opens the water inlet 23 of sea water circulating pump 20 and calibration experiments case 21, water outlet 26, make calibration experiments case
Seawater is refilled in 21；
(5) sea water circulating pump 20 is closed, 21 water inlet 23 of calibration experiments case is closed, opens High Purity Nitrogen gas cylinder 11, is opened
Second solenoid valve 15 makes high pure nitrogen pass sequentially through pressure reducing valve 12, mass flow controller 13, baroceptor 16, water removal dress
17 are set, enters calibration experiments case 21 through gas access 27, displaces seawater therein；
(6) it is full of calibration experiments case 21 to high pure nitrogen, closes the water outlet 26 of calibration experiments case 21, close calibration experiments
Case 21, the temperature sensor indicating value in experimental box 21 to be calibrated are stablized, and record the temperature value and light to be calibrated of high pure nitrogen respectively
Learn the indicating value of dissolved oxygen sensor；
(7) according to temperature, relative humidity and the pressure value of air in the calibration experiments case 21 recorded under saturation of the air state,
Oxygen partial pressure is calculated by following formula:
In formula, pO2 airIt is the partial pressure of oxygen in calibration test case calibration gas, PairIt is the gross pressure of calibration gas,It is molar fraction of the oxygen in dry air, φ is the relative humidity in calibration system,It is steamed for saturation
Air pressure is function related with temperature and salinity.
According to the indicating value for recording optical dissolved oxygen sensor to be calibrated under nitrogen saturation state, calibration algorithm model is obtained:
pO2 optode.corr=ApO2 optode+ApO2 Optode.0%(formula 2)
PO in formula2 optode.corrFor corrected optical dissolved oxygen sensor registration, pO2 optodeFor not corrected biography
Sensor registration, A are calibration factor, meet following relationship with optical dissolved oxygen sensor sensor indicating value:
A=pO2 air/(pO2 Optode.100%-pO2 Optode.0%) (formula 3)
PO in formula2 Optode.100%For the sensor registration under saturation of the air state, pO2 Optode.0%For under nitrogen saturation state
Sensor registration, pO2 airTo calculate the oxygen partial pressure obtained according to formula 1.
This method successively obtains the oxygen concentration gradient of saturated air and oxygen free air, records optical dissolved oxygen sensing to be calibrated
The indicating value and the temperature value of calibration gas, rh value, pressure value of device, by calculate obtain oxygen concentration standard value, calculate to
Calibrate the calibration factor of dissolved oxygen sensor 22.
The utility model structure is simple, easy to operate, high degree of automation, can accomplish independently to carry out without manual intervention
Calibration solves multiple passes such as the acquisition of optical dissolved oxygen sensor calibration Standard Gases, the accurate determination of calibration benchmark oxygen concentration
Key technology realizes the self calibration in situ of optical dissolved oxygen sensor, meets various model optical dissolved oxygen sensors on the market
Calibration requirements, ensure the monitoring accuracy of dissolved oxygen data, dependable with function, self calibration in situ realized, for being promoted
The quality of data of dissolved oxygen sensor in-situ monitoring, extending non-maintaining runing time in situ has important role；Without manually doing
It is pre- independently to be calibrated, solution calibration method is replaced using gas calibration, it is unstable to measurement error to solve oxygen concentration in solution
Influence, simplify solution in different dissolved oxygen concentration gradient water body proportion process, both can simplify calibration process save calibration
Time, and improve the precision of calibrated in situ benchmark oxygen concentration；The saturated air and high pure nitrogen of use expand as calibration gas
It is scattered to the pollution that not will cause atmosphere in air, does not also need any chemical reagents in a calibration process, is avoided to ocean ring
Cause secondary pollution in border.
Detailed description of the invention
Fig. 1: the utility model optical dissolved oxygen original position self-calibrating device structural schematic diagram；
Fig. 2: the utility model optical dissolved oxygen original position self-calibrating device specific structure enlarged diagram.
Wherein: 1. calibration gas generators；10. saturated air bottle；11. High Purity Nitrogen gas cylinder；12. pressure reducing valve；13. quality stream
Amount controller；14. the first solenoid valve；15. second solenoid valve；16. pressure sensor；17. de-watering apparatus；18. the first triple valve；
19. the second triple valve；2. calibrating installation underwater portion；20. water pump；21. calibration experiments case；22. dissolved oxygen sensor to be calibrated；
23. water inlet；24. temperature, humidity and baroceptor；25. switch valve；26. water outlet；27. gas access；28. tracheae；3.
Buoy；4. seawater.
Specific embodiment
The technical solution of the utility model is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figs. 1-2, the optical dissolved oxygen sensor original position self-calibrating device of the utility model, including calibration gas hair
Raw device 1, saturated air bottle 10, High Purity Nitrogen gas cylinder 11, two pressure reducing valve 12, two mass flow controller 13, the first solenoid valve
14, second solenoid valve 15, pressure sensor 16, de-watering apparatus 17, the first triple valve 18, the second triple valve 19, seawater circulation water
Pump 20, calibration experiments case 21, dissolved oxygen sensor 22 to be calibrated, temperature sensor 24, humidity sensor 24, baroceptor
24, switch valve 25.
Sea water circulating pump 20 and calibration experiments case 21 are placed in seawater, and the latter is open on three sides pressure resistance, corrosion resistant appearance
Device, side are equipped with seawater inlet and seawer outlet, entrance of the opening at top as calibration gas, for calibrating optical dissolved oxygen
Sensor is connect between 11 three of triple valve 18-19 and calibration gas generator with tracheae 28；It is placed in calibration experiments case 21
In dissolved oxygen sensor to be calibrated 22, temperature sensor 24, humidity sensor 24 and baroceptor 24, for record calibration
Dissolved oxygen concentration and environmental parameter in chamber, calibration gas generator 11 are placed on movement/fixed platform, inside installation
Saturated air bottle 10,13, two solenoid valve 14-15 of the mass flow controller of pressure reducing valve 12, two of High Purity Nitrogen gas cylinder 11, two,
Two pressure sensors 16, de-watering apparatus 17 by pipeline and are placed in the 11 two triple valve 18-19 in outside of calibration gas generator
Connection, the other end of threeway are connect with atmosphere, and water and air is discharged.Three are common to generation calibration gas and control gas circuit flow direction.
Groove in Fig. 2 on temperature sensor 22 is the position of dissolved oxygen sensor optic probe.
Core apparatus is the calibration experiments case 21 by special designing, which is set using cylindrical tube
Meter, is made of acetal plastic material, is had the advantages that high pressure resistant, etch-proof；The side of being reserved at the top of calibration experiments case 21
Just the underwater electrical connector that External Internal pipeline is connected with electric wire；Seawater inlet is reserved in 21 side wall of calibration experiments case and seawater goes out
Mouthful, the former connects sea water circulating pump 20 and detects for extracting seawater, and the latter also can be used as gas vent in air-blowing；To
Calibration dissolved oxygen sensor 22 is mounted on the middle position of calibration experiments case 21 by bracket；In 21 private side of calibration experiments case
Temperature, humidity and pressure sensor 24 are installed, for monitoring and recording temperature in calibration experiments case 21, air pressure and opposite on wall
Humidity.
It is below platform with buoy 3, the optical dissolved oxygen developed using Oceanic Instruments & Meters Inst., Shandong Prov. Academy of Sciences
Sensor is described further the method for self-calibrating in situ of optical dissolved oxygen sensor in the utility model, specifically includes following
Step:
(1) sea water circulating pump 20 is closed, 21 water inlet 23 of calibration experiments case is closed, opens solenoid valve 14, triple valve 18
It is adjusted to the channel status of calibration gas generator 11 Yu calibration experiments case 21, triple valve 19 is adjusted to the closed circuit shape of calibration experiments case 21
State, open saturated air bottle 10, make saturated air pass sequentially through pressure reducing valve 12, mass flow controller 13, baroceptor 16,
De-watering apparatus 17 enters calibration experiments case 2120 through air inlet, displaces seawater therein, and flushing pipeline 5 times；
(2) it is full of calibration experiments case 21 to air, 21 gas pressure of calibration experiments case is monitored by baroceptor 24, to
Pressure reaches 1 atmospheric pressure, closes 211 water outlet 26 of calibration experiments case, closes calibration experiments case 211, closes solenoid valve 14, stops
Only it is passed through air；
(3) 24 indicating value of temperature sensor in experimental box 211 to be calibrated is stablized, record respectively calibration gas temperature value,
The indicating value of rh value, atmospheric pressure value and optical dissolved oxygen sensor to be calibrated 22；
(4) triple valve 18 is adjusted to 21 closed circuit state of calibration experiments case, opens 21 water inlet 23 of calibration experiments case and water outlet
26, opening sea water circulating pump 20 makes in calibration experiments case 21 full of seawater.
(5) sea water circulating pump 20 is closed, 21 water inlet 23 of calibration experiments case is closed, opens solenoid valve 15, triple valve tune
19 to calibration gas generator 11 and calibration experiments case 21 channel status, triple valve 28 is adjusted to the closed circuit shape of calibration experiments case 21
State, opens High Purity Nitrogen gas cylinder 11, and high pure nitrogen passes sequentially through 12 mass flow controller 13 of pressure reducing valve, baroceptor 16, removes
Water installations 17 enter calibration experiments case 21 through air inlet, displace seawater therein, and flushing pipeline 5 times；
(6) it is full of calibration experiments case 21 to high pure nitrogen, closes 21 water outlet 26 of calibration experiments case, close calibration experiments case
21, solenoid valve 15 is closed, stopping is passed through high pure nitrogen；24 indicating value of temperature sensor in experimental box 21 to be calibrated is stablized, respectively
Record the temperature value of high pure nitrogen and the indicating value of optical dissolved oxygen sensor to be calibrated 22；
(7) according to 22 indicating value of optical dissolved oxygen sensor to be calibrated, air temperature value, relatively wet recorded in calibration process
Angle value, atmospheric pressure value and high pure nitrogen temperature value calibrate optical dissolved oxygen sensor using two point calibration methods, calculate calibration system
Number, the specific method is as follows:
1) according to temperature, relative humidity and the pressure value of air in the calibration experiments case 21 of record, pass through following formula meter
Calculate oxygen partial pressure:
In formula, pO2 airIt is the partial pressure of oxygen in calibration test case calibration gas, PairIt is the gross pressure of calibration gas,It is molar fraction of the oxygen in dry air, φ is the relative humidity in calibration system,It is steamed for saturation
Air pressure is function related with temperature and salinity.
2) according to the indicating value of optical dissolved oxygen sensor to be calibrated under nitrogen saturated environment, calibration algorithm model is obtained:
pO2 optode.corr=ApO2 optode+ApO2 Optode.0%(formula 2)
PO in formula2 optode.corrFor corrected optical dissolved oxygen sensor registration, pO2 optodeFor not corrected biography
Sensor registration, A are calibration factor.
3) the calibration factor A of formula 2 and sensor indicating value meet following relationship:
A=pO2 air/(pO2 Optode.100%-pO2 Optode.0%) (formula 3)
PO in formula2 Optode.100%For the sensor registration under saturation of the air state, pO2 Optode.0%For under nitrogen saturation state
Sensor registration, pO2 airTo calculate the oxygen partial pressure obtained according to formula 1.
Embodiment only illustrates the technical solution of the utility model, rather than carries out any restrictions to it；Although referring to aforementioned reality
Example is applied the utility model is described in detail, it for those of ordinary skill in the art, still can be to aforementioned
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and model of the utility model technical solution claimed that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (10)
1. optical dissolved oxygen sensor original position self-calibrating device, it is characterised in that: including calibration gas generator (1) and calibration cartridge
It sets underwater portion (2), calibration gas generator (1) includes saturated air bottle (10), High Purity Nitrogen gas cylinder (11), mass flow control
Device (13) and de-watering apparatus (17), calibrating installation underwater portion (2) include calibration test case, be arranged in calibration test case to
Dissolved oxygen sensor (22) and temperature, humidity and baroceptor (24) are calibrated, calibration test case is equipped with water inlet (23), water outlet
Mouth (26) and gas access (27).
2. optical dissolved oxygen sensor original position according to claim 1 self-calibrating device, it is characterised in that: calibration gas hair
Raw device (1) and calibrating installation underwater portion (2) are connected by tracheae (28), in saturated air bottle (10) and High Purity Nitrogen gas cylinder (11)
Gas enters calibration experiments case (21) from gas access (27) by tracheae (28).
3. optical dissolved oxygen sensor original position according to claim 2 self-calibrating device, it is characterised in that: saturated air bottle
(10) pressure reducing valve (12) are equipped with, saturated air bottle (10) interior gas can pass through pressure reducing valve (12), flow mass controller, first
Solenoid valve (14), pressure sensor (16) and de-watering apparatus (17) enter calibration experiments case (21) from gas access (27).
4. optical dissolved oxygen sensor original position according to claim 2 self-calibrating device, it is characterised in that: High Purity Nitrogen gas cylinder
(11) pressure reducing valve (12) are equipped with, High Purity Nitrogen gas cylinder (11) interior gas can pass through pressure reducing valve (12), flow mass controller, second
Solenoid valve (15), pressure sensor (16) and de-watering apparatus (17) enter calibration experiments case (21) from gas access (27).
5. optical dissolved oxygen sensor original position according to claim 1 to 4 self-calibrating device, it is characterised in that: also wrap
It includes water pump (20), water pump (20) is connect with water inlet (23).
6. optical dissolved oxygen sensor original position according to claim 5 self-calibrating device, it is characterised in that: water outlet (26)
Equipped with switch valve (25).
7. according to claim 1,2,3,4,6 any optical dissolved oxygen sensor original position self-calibrating device, feature exist
In: calibration experiments case (21) is made of pressure-resistant corrosion-resistant material.
8. optical dissolved oxygen sensor original position according to claim 7 self-calibrating device, it is characterised in that: quasi- gas occurs
Device is set in fixed or mobile platform.
9. optical dissolved oxygen sensor original position according to claim 8 self-calibrating device, it is characterised in that: pressure sensor
(16) there are two.
10. optical dissolved oxygen sensor original position according to claim 8 self-calibrating device, it is characterised in that: de-watering apparatus
(17) there are two.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821081054.5U CN208795660U (en) | 2018-07-09 | 2018-07-09 | Optical dissolved oxygen sensor original position self-calibrating device |
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| CN201821081054.5U CN208795660U (en) | 2018-07-09 | 2018-07-09 | Optical dissolved oxygen sensor original position self-calibrating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680551A (en) * | 2018-07-09 | 2018-10-19 | 山东省科学院海洋仪器仪表研究所 | Optical dissolved oxygen sensor original position self-calibrating device and method |
| CN113267481A (en) * | 2021-07-20 | 2021-08-17 | 常州罗盘星检测科技有限公司 | Dissolved oxygen's calbiration system |
-
2018
- 2018-07-09 CN CN201821081054.5U patent/CN208795660U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680551A (en) * | 2018-07-09 | 2018-10-19 | 山东省科学院海洋仪器仪表研究所 | Optical dissolved oxygen sensor original position self-calibrating device and method |
| CN108680551B (en) * | 2018-07-09 | 2023-08-11 | 山东省科学院海洋仪器仪表研究所 | In-situ self-calibration device and method for optical dissolved oxygen sensor |
| CN113267481A (en) * | 2021-07-20 | 2021-08-17 | 常州罗盘星检测科技有限公司 | Dissolved oxygen's calbiration system |
| CN113267481B (en) * | 2021-07-20 | 2021-10-08 | 常州罗盘星检测科技有限公司 | Dissolved oxygen's calbiration system |
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Effective date of registration: 20211103 Address after: 266000 No.2 Huiying street, Shanghe demonstration zone, Jiaozhou City, Qingdao City, Shandong Province Patentee after: Qingdao Mihai Technology Co.,Ltd. Address before: 266200, Qingdao, Shandong, Qingdao, Qingdao, the core of the blue Silicon Valley, blue Silicon Valley business center, phase one, building No. 1. Patentee before: INSTITUTE OF OCEANOGRAPHIC INSTRUMENTATION, SHANDONG ACADEMY OF SCIENCES |