TWI507685B - Nitric oxide radiosonde - Google Patents

Nitric oxide radiosonde Download PDF

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Publication number
TWI507685B
TWI507685B TW102101376A TW102101376A TWI507685B TW I507685 B TWI507685 B TW I507685B TW 102101376 A TW102101376 A TW 102101376A TW 102101376 A TW102101376 A TW 102101376A TW I507685 B TWI507685 B TW I507685B
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TW
Taiwan
Prior art keywords
nitrogen dioxide
cold light
sonde
light agent
reaction tank
Prior art date
Application number
TW102101376A
Other languages
Chinese (zh)
Other versions
TW201428290A (en
Inventor
Ching Ho Lin
Chien Hong Sung
shu hua Yang
Chin Hsing Lai
Li Jen Huang
Original Assignee
Univ Fooyin
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Publication date
Application filed by Univ Fooyin filed Critical Univ Fooyin
Priority to TW102101376A priority Critical patent/TWI507685B/en
Publication of TW201428290A publication Critical patent/TW201428290A/en
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Publication of TWI507685B publication Critical patent/TWI507685B/en

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Description

Nitrogen dioxide sonde
The invention relates to the structure of a nitrogen dioxide sonde, in particular to a reaction of the outside air directly into the reaction tank by a Teflon reciprocating pump, and reacting with the wet cloth core with the cold light agent in the tank. Fluorescence is generated, which automatically executes a program to convert the concentration of nitrogen dioxide according to the amount of fluorescence, temperature, and pressure.
Nitrogen dioxide (NO 2 ) is an important atmospheric pollutant involved in photochemical reactions, which can be derived from man-made and natural emissions. Nitrogen dioxide sondes can be used with balloons and other vehicles to accurately measure the NO 2 concentration in the vertical profile of the atmosphere. Distribution helps to clarify the source of NO 2 in the atmosphere.
As shown in Fig. 2, the conventional nitrogen dioxide sonde 1 imported from abroad has at least a pressure sensor 11, a zero-stage system pump 12, a zero-stage scrubber 13, an ozone scrubber 14, and a reaction. Components such as the tank 15, the waste liquid tank 16, the fluorescence measuring device 17, the small peristaltic pump 18, the cold light agent storage tank 19, the sampling air pump 20, and a circuit board (not shown) are heavy and complicated in construction. In particular, the internal zero-stage system pump 12, the zero-stage scrubber 13, and the ozone scrubber 14 occupy a considerable weight. In order to adapt to the domestic climate environment and effectively reduce the material cost of each lift operation, it needs to be further improved or lightened.
In addition to the aforementioned weight problems, the conventional nitrogen dioxide sonde 1 has a problem that affects the accuracy of the measurement. Since the sampling pump 20 is disposed at the exhaust gas outlet end of the reaction tank 15, the pressure in the reaction tank 15 is required to be lower than the outside by suction, so that the outside air can be introduced into the reaction tank 15 through the ozone scrubber 14 or the like. However, the reaction tank 15 is in communication with the waste liquid tank 16, and the low pressure in the reaction tank 15 also causes the liquid in the waste liquid tank 16 to be easily evaporated and contaminated into the reaction tank 15 The air inside, even if it is swayed by the wind, can also cause the waste liquid to flow back to the reaction tank 15, causing errors in the measurement of the concentration of nitrogen dioxide.
In addition, since the waste liquid is corrosive to the strong alkali, the waste gas containing the liquid droplets or the vaporized liquid is inevitably contained in the exhaust gas, and after the liquid droplets or the alkaline gas enters the sampling air pump 20, the use of the sample air pump 20 is degraded. Life and performance. Finally, in order to measure the mass flow rate of the sampling gas, a barometer (not shown) is disposed between the reaction tank 15 and the sampling pump 20 for measuring the pressure of the exhaust gas in the pipeline, thereby calculating the reaction into the reaction. The gas mass flow rate of the tank, such pressure measurement for mass flow rate estimation, easily including errors from several sources. One is that the measured exhaust gas flow includes the amount of gas evaporated by the waste liquid, not just the flow rate of air entering the reaction tank; the second is between the reaction tank 15 and the waste liquid tank 16, only a simple O-ring ( O-ring) Prevents leakage of air from the periphery. If there is any inconsistency, the outside air will be sucked into the exhaust gas. The third is that the air entering the reaction tank is different from the temperature of the cold light agent. The temperature of the gas is not measured and corrected in the exhaust gas line, which also affects the correctness of the mass flow rate calculation result and indirectly affects the accuracy of the NO 2 measurement.
In order to improve the disadvantages of the conventional nitrogen dioxide sonde, the present invention provides a nitrogen dioxide sonde, which can be provided with at least one reaction tank, a Teflon reciprocating pump, and an electronic circuit. The Teflon reciprocating pump is connected to the reaction tank for directly sending outside air into the reaction tank to react with the wet cloth core with the cold light agent in the tank to generate fluorescence. The electronic circuit is connected with a plurality of temperature probes, an atmospheric pressure sensor and a fluorescent measuring device, and uses a temperature probe to detect the outside temperature, the temperature of the reaction tank, the temperature of the Teflon reciprocating pump, and the atmospheric pressure. The force sensor detects the atmospheric pressure at the location, and measures the fluorescence generated in the reaction by the fluorescence measuring device, and automatically executes a program, which is converted according to the amount of fluorescence, atmospheric pressure and temperature. The concentration of nitrogen dioxide.
The main differences between the construction of the present invention and the prior art are as follows:
1. The construction of the present invention eliminates the need to use the prior art zero stage system pump 12, zero stage scrubber 13, and ozone scrubber 14, which saves cost and reduces the weight of the radiosonde.
Second, before the prior art sampling pump 20 is modified into the reaction chamber, and a reciprocating constant flow pump is used. At the same time, the exhaust gas pressure and the applied exhaust gas pressure are no longer measured to calculate the mass flow rate of the sampled gas, but the atmospheric pressure and the temperature of the sampling pump are measured to accurately calculate the mass flow rate of the gas entering the reaction tank.
1‧‧‧ Nitrogen dioxide sonde
2‧‧‧ Nitrogen dioxide sonde
3‧‧‧ Ground receiving antenna
4‧‧‧Signal Processing Host
11‧‧‧ Pressure Sensor
12‧‧‧zero system pump
13‧‧‧zero-level scrubber
14‧‧‧Ozone scrubber
15‧‧‧Reaction tank
16‧‧‧ Waste tank
17‧‧‧Fluorescent measuring device
18‧‧‧Small peristaltic pump
19‧‧‧ cold light agent storage tank
20‧‧‧Sampling pump
21‧‧‧Flight device
22‧‧‧Reaction tank
23‧‧‧Teflon reciprocating pump
24‧‧‧Electronic circuits
25‧‧‧Cold light agent supply device
26‧‧‧ Memory Card (SD Card)
27‧‧‧GPS device
28‧‧‧RF devices
221‧‧‧Wet cloth core
222‧‧‧ Waste storage tank
241‧‧‧Temperature probe
242‧‧‧Atmospheric pressure sensor
243‧‧‧Fluorescent measuring device
244‧‧‧Photomultiplier tube (PMT)
251‧‧‧Small peristaltic pump
252‧‧‧cold light storage tank
Fig. 1 is a view showing an application example of a nitrogen dioxide sonde of the present invention connected to a flying device.
Figure 2 is a schematic diagram showing the internal structure of a conventional nitrogen dioxide sonde imported from abroad.
Figure 3 is a schematic view showing the internal structure of a nitrogen dioxide sonde according to the present invention.
As shown in Fig. 1, the nitrogen dioxide sonde 2 of the present invention is connected to a flying device 21 composed of a helium balloon, and continuously detects the concentration of nitrogen dioxide in the air during the ascending and descending process, and Data is wirelessly transmitted back to the ground via a radio frequency device.
As shown in Fig. 3, the nitrogen dioxide sonde 2 of the present invention comprises a reaction tank 22, a Teflon reciprocating pump 23, and an electronic circuit 24. The electronic circuit 24 is implemented on a circuit board carrying a program for converting the concentration of nitrogen dioxide according to the temperature measured at each moment, the atmospheric pressure, and the amount of fluorescent light generated by the exposure of the nitrogen dioxide to the cold light agent.
A wet cloth core 221 coated with a cold light agent can be accommodated inside the reaction tank 22 to react with nitrogen dioxide in the air to generate fluorescence, and the fluorescent light penetrates through a window to enter a fluorescent measuring device 243 to generate electrons. Signal, the intensity of fluorescence is proportional to the concentration of nitrogen dioxide, so the electronic signal is strong. Weakness is also proportional to the concentration of nitrogen dioxide.
In the implementation, a cold light agent supply means 25 may be provided in the reaction tank 22 to supply the cold light agent to the wet cloth core 221 instead of the cold light agent which has generated the fluorescent reaction. The cold light agent supply device 25 can include a small peristaltic pump 251 and a cold light agent storage tank 252. The cold light agent is pumped from the cold light agent storage tank 252 into the reaction tank 22 by the small peristaltic pump 251, and is continuously wetted with a new cold light agent. A wet cloth core 221 with a cold light agent. Further, the reaction tank 22 may be connected or connected to a waste liquid storage tank 222 to collect the cold light agent waste liquid dripped from the wet cloth core 221 .
A Teflon reciprocating pump 23 is connected to the reaction tank 22 for directly feeding an outside air into the reaction tank 22 to react with the wet cloth core 221 impregnated with the cold light to generate fluorescence. Since the motor speed behind the Teflon reciprocating pump 23 is fixed, the volume of air pushed by each piston stroke is fixed to achieve a fixed flow rate. Teflon and nitrogen dioxide do not react chemically and are not conductive, so Will change the composition of the outside air.
The electronic circuit 24 can connect a plurality of temperature probes 241, an atmospheric pressure sensor 242 and a fluorescence measuring device 243, and the temperature probe 241 detects the temperature of the outside, the temperature of the reaction tank, and the Teflon reciprocating type. The temperature of the air pump is used to detect the atmospheric pressure at the location using the atmospheric pressure sensor 242. Preferably, a memory card (SD card) 26 is connected to the electronic circuit 24 to store the measurement results of the fluorescence measuring device 243, the temperature probes 241 and the atmospheric pressure sensor 242. In addition, the electronic circuit 24 can still be connected to a GPS device 27 to provide the space coordinates of the nitrogen dioxide sonde 2, and provide the corresponding three-dimensional spatial position and satellite time for each detected nitrogen dioxide concentration value. .
According to the relevant literature (Sitnikov et al, 2005; Drummond Technology Inc, 2006), it is pointed out that temperature and pressure affect the concentration measured by the nitrogen dioxide sonde, resulting in a deviation between the measured concentration and the actual concentration, relative to the application at high altitude. The interference factor such as the nitrogen dioxide sonde is more important for the concentration measurement, so the pressure and temperature correction is required for the NO2 measurement. The electronic circuit 24 of this embodiment may include a program with built-in parameters, and the fluorescence measuring device 243 The measurement result is converted into the concentration of nitrogen dioxide, and the concentration value of the nitrogen dioxide is adjusted according to the measurement results of the atmospheric pressure sensor 242 and each temperature probe 241 and using the built-in parameters.
The electronic circuit 24 can also be connected to a radio frequency device 28 for wirelessly transmitting the measurement results of the fluorescence measuring device 243, the temperature probes 241 and the atmospheric pressure sensor 242, or wirelessly transmitting each detected nitrogen dioxide. Concentration value and its corresponding three-dimensional spatial position and satellite time. The radio frequency device 28 is paired with a ground receiving antenna 3 for measuring the fluorescence measuring device 243, the atmospheric pressure sensor 242 and the temperature probes 241, and the detected nitrogen dioxide concentration value and The corresponding three-dimensional spatial position and satellite time are forwarded to a signal processing host 4.
The amount of fluorescence is proportional to the concentration of nitrogen dioxide. The fluorescence measuring device 243 generates a voltage signal by fluorescence, and the temperature, pressure and parameters are adjusted. The built-in program of the electronic circuit 24 converts the voltage signal into two. Nitric oxide concentration. In implementation, the fluorescence measuring device 243 can include a photomultiplier tube (PMT) 244, and a separate analog digital converter is used to measure the voltage value of the photomultiplier (PMT) 244, and the resolution can be Reach 24Bit.
In other words, when the outside air containing nitrogen dioxide is quantitatively fed into the reaction tank 22 by the Teflon reciprocating pump 23, it will be in contact with the cold light agent on the wet cloth core 221 to emit fluorescence, and the fluorescent light will be irradiated. The photomultiplier tube 244 causes the photomultiplier tube 244 to generate a voltage signal related to the concentration of nitrogen dioxide, and the cold light agent after the reaction becomes a waste liquid, which can be discharged from the waste liquid outlet of the reaction tank 22 to the waste liquid storage tank 222. The exhausted air is exhaust gas and can be discharged from the exhaust gas outlet of the reaction tank 22.
Since the cold light agent used in the present embodiment is prepared by using a formulation which is known not to be affected by the chemical reaction of ozone, it is not necessary to load the zero-stage system pump 12, the zero-stage scrubber 13, the ozone scrubber 14, and the like. A lightweight goal can be achieved. In addition, the Teflon reciprocating air pump 23 is selected to avoid the chemical reaction between the sampling air and the pump body, and the reciprocating quantitative air supply mode can also solve the problem of unstable sampling air flow in the conventional structure. Finally, in this embodiment, a front-mounted (before the reaction tank) Teflon reciprocating pump is used, and the atmospheric pressure and the temperature measurement of the pump can be used to accurately calculate the mass flow rate of the air entering the reaction tank, and the amount of NO 2 is increased. The accuracy of the measurement.
In summary, the improvement of the present invention can indeed solve the problems of the conventional nitrogen dioxide sonde in the weight, the sampling air flow is unstable, the mass flow calculation is inaccurate, and the sampling pump is corroded by the waste liquid, which is obviously in conformity with practicality. Patent requirements such as novelty and advancement.
2‧‧‧ Nitrogen dioxide sonde
22‧‧‧Reaction tank
23‧‧‧Teflon reciprocating pump
24‧‧‧Electronic circuits
25‧‧‧Cold light agent supply device
26‧‧‧ Memory Card (SD Card)
27‧‧‧GPS device
28‧‧‧RF devices
221‧‧‧Wet cloth core
222‧‧‧ Waste storage tank
241‧‧‧Temperature probe
242‧‧‧Atmospheric pressure sensor
243‧‧‧Fluorescent measuring device
244‧‧‧Photomultiplier tube (PMT)
251‧‧‧Small peristaltic pump
252‧‧‧cold light storage tank

Claims (10)

  1. A nitrogen dioxide sonde is attached to a flying device for lifting to detect the concentration of nitrogen dioxide in the air during the lifting thereof, and at least: a reaction tank, the inner container is filled with a wet cloth core of a cold light agent; a Teflon reciprocating air pump connected to the reaction tank for directly sending an outside air into the reaction tank and reacting with the wet cloth core impregnated with the cold light agent to generate a firefly And an electronic circuit having a plurality of temperature probes for detecting an ambient temperature, a reaction tank temperature, a temperature of a Teflon reciprocating pump; and an atmospheric pressure sensor for detecting the second The atmospheric pressure at the height of the nitric oxide sonde; and a fluorescent measuring device generates a corresponding voltage signal according to the intensity of the fluorescent light, and uses the voltage signal, the atmospheric pressure sensor and the majority temperature probe The measurement results were converted to nitrogen dioxide concentration.
  2. The nitrogen dioxide sonde as described in claim 1 further comprises a cold light agent supply device for supplying a cold light agent to the reaction tank.
  3. The nitrogen dioxide sonde as described in claim 2, wherein the cold light agent supply device comprises a small peristaltic pump and a cold light agent storage tank for conveying the cold light agent from the cold light agent storage tank to the reaction tank. Inside, wet the wet cloth core with the cold light agent.
  4. The nitric oxide sonde as described in claim 1, wherein the reaction tank is connected to a waste liquid storage tank for collecting a cold light agent dripped from the wet cloth core impregnated with the cold light agent.
  5. The nitrogen dioxide sonde as described in claim 1, wherein the electronic circuit is connected to a memory card (SD card) for storing the fluorescence measuring device and the measurement result of the plurality of temperature probes. .
  6. The nitrogen dioxide sonde as described in claim 1, wherein the fluorescence measuring device is provided with a photomultiplier tube (PMT).
  7. The nitrogen dioxide sonde as described in claim 1, wherein the electronic circuit is still connected A GPS device is connected to provide the space coordinates and satellite time of the nitrogen dioxide sonde.
  8. The nitrogen dioxide sonde as described in claim 1, wherein the electronic circuit is connected to a radio frequency device for wirelessly transmitting the converted nitrogen dioxide concentration each time.
  9. The nitrogen dioxide sonde as described in claim 8, wherein the radio frequency device is paired with a ground receiving antenna for the fluorescent measuring device, the atmospheric pressure sensor and the plurality of temperature probes The measurement result is sent to a signal processing host.
  10. The nitrogen dioxide sonde as described in claim 1, wherein the electronic circuit carries a built-in parameter program, and the voltage signal generated by the fluorescent measuring device, the atmospheric pressure sensor and The measurement result of the majority of the temperature probe is converted to the concentration of the nitrogen dioxide.
TW102101376A 2013-01-14 2013-01-14 Nitric oxide radiosonde TWI507685B (en)

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TWI507685B true TWI507685B (en) 2015-11-11

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890494A (en) * 1983-10-08 1990-01-02 Plessey Overseas Limited Atmospheric sensor
TW559658B (en) * 1999-06-30 2003-11-01 Ind Tech Res Inst System and method for measuring concentration of ozone
TW200637643A (en) * 2005-04-26 2006-11-01 Mitsubishi Heavy Ind Ltd Exhaust gas treatment system and exhaust gas treatment method
EP1475631B1 (en) * 2002-03-29 2008-05-28 Honda Giken Kogyo Kabushiki Kaisha Temperature control device for exhaust gas sensor and temperature control method for the sensor
TW201104247A (en) * 2009-07-28 2011-02-01 Univ Nat Taiwan Gas detecting device and gas monitoring device
CN201971158U (en) * 2011-03-30 2011-09-14 杨当立 Air sampling aircraft
TW201135225A (en) * 2010-01-11 2011-10-16 Applied Nanotech Holdings Inc Gas sensor
TW201226895A (en) * 2010-12-27 2012-07-01 Ind Tech Res Inst Gas sensor and manufacture method thereof
TWM443164U (en) * 2012-06-19 2012-12-11 Univ Vanung Air quality monitoring system
TW201250239A (en) * 2011-02-03 2012-12-16 Fuji Electric Co Ltd Gas detection device and gas detection method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890494A (en) * 1983-10-08 1990-01-02 Plessey Overseas Limited Atmospheric sensor
TW559658B (en) * 1999-06-30 2003-11-01 Ind Tech Res Inst System and method for measuring concentration of ozone
EP1475631B1 (en) * 2002-03-29 2008-05-28 Honda Giken Kogyo Kabushiki Kaisha Temperature control device for exhaust gas sensor and temperature control method for the sensor
TW200637643A (en) * 2005-04-26 2006-11-01 Mitsubishi Heavy Ind Ltd Exhaust gas treatment system and exhaust gas treatment method
TW201104247A (en) * 2009-07-28 2011-02-01 Univ Nat Taiwan Gas detecting device and gas monitoring device
TW201135225A (en) * 2010-01-11 2011-10-16 Applied Nanotech Holdings Inc Gas sensor
TW201226895A (en) * 2010-12-27 2012-07-01 Ind Tech Res Inst Gas sensor and manufacture method thereof
TW201250239A (en) * 2011-02-03 2012-12-16 Fuji Electric Co Ltd Gas detection device and gas detection method
CN201971158U (en) * 2011-03-30 2011-09-14 杨当立 Air sampling aircraft
TWM443164U (en) * 2012-06-19 2012-12-11 Univ Vanung Air quality monitoring system

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