CN1220043C - Ozone concentration detection method and device used for ozone box - Google Patents

Abstract

The invention relates to an ozone concentration detection method and device used in an ozone aging test chamber. Its detection method includes measuring the flow rate Q1 of the main air supply circuit that supplies air to the working room, and it is characterized in that, when measuring the flow rate Q1 of the main air supply circuit, simultaneously measure the flow rate Q2 of the ozone gas supply circuit to the air ozone mixer, And the ozone concentration of the ozone gas in the ozone gas supply path is detected by non-dispersive ultraviolet absorption photometry, and the ozone concentration value in the working room is converted with a fixed Q1/Q2 value. The measuring device is that in the original device, a flowmeter is set on the inlet pipeline of the ozone generator, and a sample tube is set on the outlet pipeline; there is also an optical path detection system, which consists of a sample tube, an ultraviolet light source, a detector, a signal processor and Reader composition. The invention can continuously detect the ozone concentration in the working room in real time, the detection system has simple structure and low manufacturing cost.

Description

Ozone concentration detection method and device for ozone aging test chamber

technical field

The invention relates to an ozone concentration detection method and device, in particular to an ozone concentration detection method and device for an ozone aging test chamber.

Background technique

In the prior art, the air supply system in the ozone aging test chamber is: the main air supply air supply composed of the outlet of the air pump connected to the inlet of the working room through a voltage stabilizer, a dry purifier, a flow meter, a heater and a mixer. Road, and the ozone gas supply path formed by connecting the branch outlet of the dry purifier to the branch inlet of the mixer through the ozone generator. And a sample tube is set on the air outlet pipeline of the studio for measuring the ozone concentration. There are two main categories of concentration detection methods in existing ozone aging test chambers:

The first category is to collect the exhaust gas output from the studio and use chemical methods to react and absorb the ozone in it, and then obtain the ozone concentration value through chemical titration. This type of method is cumbersome and time-consuming to operate, and the amount of sampling must be strictly controlled to ensure that the sample is completely absorbed, which is not easy to do well. More importantly, this method cannot realize the real-time continuous detection of the ozone concentration in the studio. Realizing real-time and continuous detection of the ozone concentration in the working chamber is a necessary function for manufacturing high-quality real-time and continuous adjustable working chamber ozone concentration instruments.

The second category uses non-dispersive ultraviolet absorption method, electrochemical method, etc. to continuously detect the ozone concentration in the exhaust gas of the studio. Because the ozone concentration in the studio exhaust gas is extremely low, often only 0.01-0.5PPM. Therefore, its detection system requires high sensitivity and stability in order to obtain the necessary detection signal strength and signal-to-noise ratio. Therefore, the detection system of this type of instrument has a complicated structure and high manufacturing cost. Moreover, when the concentration of ozone in the exhaust gas of the studio is low, the detection error is relatively large.

Contents of the invention

The object of the present invention is to provide an ozone concentration detection method and device for an ozone aging test chamber, which can continuously detect the ozone concentration in the working room in real time, has a relatively simple structure of the detection system, and is low in manufacturing cost.

In order to achieve the above object, the present invention adopts the following technical solutions: a method for detecting ozone concentration in an ozone aging test chamber, comprising measuring the flow rate Q1 of the main air supply path of air supply to the working room, characterized in that, when measuring When the flow rate of the main air supply path is Q1, measure the flow rate Q2 of the ozone gas path to the air ozone mixer at the same time, and set a sample tube on the outlet line of the ozone generator, and use non-dispersive ultraviolet absorption photometry to detect the ozone in the ozone gas path The ozone concentration of the gas is converted to the ozone concentration in the studio.

The air flow Q1 in the above-mentioned main air supply circuit is 10-1000 liters/minute, and the flow Q2 of ozone-containing gas in the ozone supply circuit is 1/10-1/1000 of the air flow Q1 in the main air supply circuit, That is, Q1/Q2=10-1000; the gas exchange rate in the studio is 1-3 times/min.

One of the methods for the above-mentioned non-dispersive ultraviolet light absorption spectrometry to detect the concentration of ozone-containing gas in the ozone gas path is to irradiate one side of the sample tube with an ultraviolet light source, and to detect the intensity of ultraviolet light with a detector on the other side, thereby obtaining The ozone concentration signal is output to the signal processor and the reader; the detection steps are:

a. After starting up, do not turn on the ozone generator first, and collect blank signals first under the condition of no ozone;

b. After turning on the ozone generator, continue to collect sample signals;

c. Send signal processor and reader separately to obtain continuous real-time ozone concentration value;

d. Calculate the ozone concentration value in the studio with a fixed Q1/Q2 value.

The second method of the above-mentioned non-dispersive ultraviolet light absorption spectrometry to detect the ozone concentration of the ozone-containing gas in the ozone gas line is to set a reference tube on the inlet pipeline of the ozone generator, and use ultraviolet light on the side of the reference tube and the sample tube. The light source is irradiated, and the other side of them uses a detector to detect the ultraviolet intensity, so as to obtain the ozone concentration signal output to the signal processor and the reader; the detection steps are:

a. After starting up, detect the ultraviolet light intensity of the reference tube and the sample tube at the same time; send the signal processor and the reader at the same time, and adjust the reading of the reader to zero.

b. Turn on the ozone generator and detect the ultraviolet light intensity of the reference tube and the sample tube at the same time; send the signal processor and the reader at the same time to obtain the continuous real-time ozone concentration value;

c. Calculate the ozone concentration value in the studio with a fixed Q1/Q2 value.

An ozone concentration detection device for an ozone aging test chamber, comprising a main air supply path formed by connecting the outlet of an air pump to the inlet of a working chamber through a voltage stabilizer, a dry purifier, a flow meter, a heater and a mixer, and a The ozone gas supply circuit formed by connecting the branch outlet of the drying purifier to the branch inlet of the mixer through the ozone generator is characterized in that in the ozone supply circuit, a flow meter is set on the inlet pipeline of the ozone generator, and A sample tube is set on the gas outlet line; there is an optical path detection system, the structure of which is: a UV light source is set on one side of the sample tube, and a non-dispersive UV light intensity detector is set on the other side, and the output port of the detector is connected to a signal The input port of the processing system and the output port of the signal processing system are connected to the input port of a reading system.

A reference tube is also arranged on the air inlet pipeline of the above-mentioned ozone generator; in the optical path detection system, one side of the reference tube faces the ultraviolet light source, and a non-dispersive ultraviolet light intensity detector is arranged on the other side, and its output port is connected to The input port of the signal processing system.

Compared with the prior art, the present invention has the following outstanding features and significant advantages: the present invention eliminates the use of studio tail gas as the detection object in the prior art, but uses the studio air supply as the detection object, and the sample tube is arranged in the ozone supply In the gas path, the concentration of ozone in the gas to be measured is high, so that the obtained sample signal is strong, the signal-to-noise ratio is large, and it is easy to accurately measure the ozone concentration value, which is conducive to improving the measurement accuracy and reliability, and is conducive to improving the working stability of the instrument Therefore, the requirements for the optical system of the instrument, the electronic signal processing system and the ultraviolet detector are greatly reduced. The detection system has a simple structure and low manufacturing cost.

Description of drawings

Fig. 1 is a structural block diagram of an air supply system according to an embodiment of the present invention.

FIG. 2 is a block diagram of the single optical path detection system illustrated in FIG. 1 .

Fig. 3 is a structural block diagram of an air supply system according to another embodiment of the present invention.

FIG. 4 is a block diagram of the dual optical path detection system illustrated in FIG. 3 .

Detailed ways

Embodiment one: referring to Fig. 1 and Fig. 2, the ozone concentration detection method that this is used for ozone aging test box includes measuring the flow rate Q1 of the main air supply path that supplies air to the working room 7, and simultaneously measures the flow rate Q1 to the air ozone mixer 6 The flow rate Q2 of the ozone gas supply path, and the ozone concentration of the ozone gas in the ozone supply path is detected by non-dispersive ultraviolet absorption photometry, thereby converting the ozone concentration in the working room. Adjust the air flow Q1 in the main air supply circuit to 10-1000 liters per minute, and the flow Q2 of ozone-containing gas in the ozone supply circuit is 1/10-1/1000 of the air flow Q1 in the main air supply circuit, namely Q1/Q2=10-1000; the gas exchange rate in the studio 7 is 1-3 times/min. The method for the above-mentioned non-dispersive ultraviolet light absorption photometry to detect the ozone concentration of the ozone-containing gas in the ozone gas circuit is: the sample tube 8 is set on the outlet pipeline of the ozone generator, and the side of the sample tube 8 is irradiated with the ultraviolet light source 12, while the other One side detects the ultraviolet absorption luminosity with detector 13 and outputs ozone concentration signal to signal processor 14 and reader 15; Detection steps are:

a. After starting up, do not turn on the ozone generator first, and collect blank signals first under the condition of no ozone;

b. After turning on the ozone generator, continue to collect sample signals;

c. send signal processor 14 and reader 15 respectively, obtain continuous real-time ozone concentration value;

d. Convert the ozone concentration value in the studio 7 with a fixed Q1/Q2 value.

The ozone concentration detecting device that is used for ozone aging test box of present embodiment, referring to Fig. 1 and Fig. 2, comprises by air pump 1 outlet through stabilizer 2, drying purifier 3, flow meter 4, heater 5 and mixer 6 and the main gas supply path that is connected to the inlet of the working chamber 7, and the ozone gas path that is formed by the branch outlet of the dry purifier 3 and connected to the branch inlet of the mixer 6 through the ozone generator 9, for supply In the ozone gas circuit, a flow meter 11 is arranged on the inlet pipeline of the ozone generator 9, and a sample tube 8 is arranged on the outlet pipeline; , while the other side is provided with a non-dispersive ultraviolet absorption detector 13, the output port of the detector 13 is connected to the input port of a signal processing system 14, and the output port of the signal processing system 14 is connected to the input port of a reading system 15. The above-mentioned ultraviolet wavelength is 254nm, the above-mentioned detectors 13 and 16 are GD-18 ultraviolet photosensitive tubes of Chengdu Xuguang, and the above-mentioned signal processor 14 is mainly composed of a voltage amplifier output connected with a logarithmic circuit.

Embodiment two: referring to Fig. 3 and Fig. 4, the detection method of the present embodiment is basically the same as the detection method of the above-mentioned embodiment, the difference is: non-dispersive ultraviolet light absorption photometry detects the ozone gas containing ozone in the ozone gas circuit The method of concentration is: set reference tube 10 on the inlet pipeline of ozone generator, and set sample tube 8 on the outlet pipeline, irradiate with ultraviolet light source 12 on the side of reference tube 10 and sample tube 8, and their other Each side uses a detector 13,16 to detect the ultraviolet absorption luminosity and outputs the ozone concentration signal to the processor 14 and the reader 15 respectively; The detection steps are:

a. After starting up, detect the ultraviolet light intensity of the reference tube and the sample tube at the same time; send the signal processor and the reader at the same time, and adjust the reading of the reader to zero.

b. Turn on the ozone generator and detect the ultraviolet light intensity of the reference tube and the sample tube at the same time; send the signal processor and the reader at the same time to obtain the continuous real-time ozone concentration value;

c. Calculate the ozone concentration value in the studio with a fixed Q1/Q2 value.

Referring to Fig. 3 and Fig. 4, the device of the detection method of the present embodiment is basically the same as the device of the detection method of the above-described embodiment, and the difference is: a reference tube 10 is also set on the air inlet pipeline of the ozone generator 9; In the detection system, one side of the reference tube 10 faces the ultraviolet light source 12 , and a non-dispersive ultraviolet photometric detector 16 is arranged on the other side, the output port of which is connected to the input port of the signal processing system 14 .

Claims (6)

1. a kind of ozone concentration detection method that is used for ozone aging test chamber, comprises measuring the flow Q1 of the main air supply path of gas supply to working room (7), it is characterized in that, when measuring main air supply path flow Q1 , measure the flow Q2 of supplying the ozone gas circuit to the air ozone mixer (6) simultaneously, and set the sample tube (8) on the ozone generator outlet pipeline, adopt non-dispersive ultraviolet absorption photometry to detect the ozone gas supply in the ozone gas circuit Ozone concentration, thereby converting the ozone concentration in the studio. 2. the ozone concentration detection method that is used for ozone aging test box according to claim 1, it is characterized in that the air flow Q1 in the main air supply circuit is 10-1000 liters/min, and contains ozone gas in the ozone circuit The flow rate Q2 of main air is 1/10-1/1000 of the air flow rate Q1 in the main air supply circuit, namely Q1/Q2=10-1000; The gas exchange rate in the studio (7) is 1-3 times/min. 3. the ozone concentration detection method that is used for ozone aging test box according to claim 1, it is characterized in that non-dispersive ultraviolet light absorption photometry detects the method for containing ozone gas ozone concentration in the ozone gas circuit is: in sample tube ( 8) One side is irradiated with ultraviolet light source (12), and the other side detects ultraviolet intensity with detector (13), thereby obtains ozone concentration signal output to signal processor (14) and reader (15); Detection step is : a. After starting up, do not turn on the ozone generator first, and collect blank signals first under the condition of no ozone; b. After turning on the ozone generator, continue to collect sample signals; c. send signal processor (14) and reader (15) respectively, obtain continuous real-time ozone concentration value; d. Convert the ozone concentration value in the working chamber (7) with the fixed Q1/Q2 value. 4. the ozone concentration detection method that is used for ozone aging test chamber according to claim 1 is characterized in that the non-dispersive ultraviolet light absorption photometry method detects the method that contains ozone gas ozone concentration in the ozone gas circuit and is: in the ozone generator A reference tube (10) is arranged on the air inlet line, and one side of the reference tube (10) and the sample tube (8) is irradiated with an ultraviolet light source (12), while their other side is respectively equipped with a detector (13, 16). ) to detect the intensity of ultraviolet rays, thereby obtaining the ozone concentration signal output to the processor (14) and reader (15); the detection steps are: a. After starting up, detect the ultraviolet light intensity of reference tube (10) and sample tube (8) simultaneously; Send signal processor (14) and reader (15) simultaneously, the reading of adjustment reader is zero. B. open the ozone generator, detect the ultraviolet light intensity of reference tube (10) and sample tube (8) simultaneously; Send signal processor (14) and reader (15) simultaneously, obtain continuous real-time ozone concentration value; c. Convert the ozone concentration value in the working chamber (7) with the fixed Q1/Q2 value. 5. the device for the ozone concentration detecting method of ozone aging test box according to claim 1, comprises by air pump (1) outlet through voltage stabilizer (2), drying purifier (3), flowmeter (4) ), the heater (5) and the mixer (6) are connected to the main gas supply path formed by the inlet of the working chamber (7), and the branch outlet of the dry purifier (3) is connected to the ozone generator (9) The ozone gas supply circuit formed by the branch inlet of the mixer (6) is characterized in that in the ozone gas supply circuit, a flow meter (11) is set on the inlet pipeline of the ozone generator (9), and a flow meter (11) is set on the gas outlet pipeline. Sample tube (8); There is an optical path detection system, and its structure is: an ultraviolet light source (12) is set on one side of sample tube (8), and the detector (13) of a non-dispersive ultraviolet absorption photometry is set on the other side, The output port of the detector (13) is connected to the input port of a signal processing system (14), and the output port of the signal processing system (14) is connected to the input port of a reading system (15). 6. the device of the ozone concentration detection method that is used for ozone aging test box according to claim 5, is characterized in that a reference tube (10) is also set on the air inlet pipeline of ozone generator (9); One side of the reference tube (10) faces the ultraviolet light source (12), and a non-dispersive ultraviolet photometric detector (16) is arranged on the other side, and its output port is connected to the input port of the signal processing system (14).

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