CN106404694B - Device for dynamically monitoring smoke component concentration in cigarette smoking process - Google Patents

Abstract

A device for dynamically monitoring smoke component concentration in a cigarette smoking process is characterized in that: the smoke sucking machine comprises a smoke sucking machine, a two-way valve of the smoke sucking machine, a multi-reflection gas absorption pool, a filter disc, a three-way valve and a cigarette holder which are sequentially communicated according to the smoke sucking flow direction, wherein a light incidence end of the multi-reflection gas absorption pool is connected with an optical fiber collimator, a laser current controller and a laser temperature controller, a light receiving end of the multi-reflection gas absorption pool is connected with a photoelectric detector, the laser current controller and the laser temperature controller are connected with a computer, the photoelectric detector is connected with the computer through a data acquisition card, and a vacuum pump is connected on a gas path between the two-way valve of the smoke sucking machine and the multi-reflection gas absorption pool through the two-way valve. The method overcomes the defects that the pretreatment process is time-consuming, the detection steps are complicated, and the dynamic change of the smoke components cannot be accurately reflected in the prior art, and has important significance for deeply exploring the cigarette combustion pyrolysis mechanism and evaluating the real-time toxicity of the smoke.

Description

A device for dynamically monitoring the concentration of smoke components during cigarette smoking

technical field

The invention relates to a gas concentration detection device, in particular to a device for dynamically monitoring the concentration of smoke components during cigarette smoking.

Background technique

During the smoking process of cigarettes, there are a series of complex physical and chemical changes in the high-temperature combustion zone, distillation cracking zone or low-temperature condensation zone. Cigarette smoke is an aerosol produced during the burning of cigarettes and is one of the most complex systems known. Among them, mainstream smoke is the smoke that passes through the filter tip of cigarettes during smoking. Its harmful components can directly act on human organs. The type and content of harmful components are used together to judge the toxicity of smoke. The release amount can be used to reflect the combustion state of the cigarette. However, the composition and concentration of cigarette smoke have been in a process of dynamic change along with the smoking process. The combustion state of cigarettes is closely related to the chemistry of smoke. Therefore, detecting the real-time dynamic changes of harmful smoke components in mainstream smoke during cigarette smoking is of great significance for in-depth exploration of the pyrolysis mechanism of cigarette combustion and evaluation of smoke toxicity. It is necessary to design a device for real-time online monitoring of the concentration of smoke components during the smoking process.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a convenient and fast method for characterizing flue gas in view of the disadvantages of time-consuming sample pretreatment, cumbersome detection steps and failure to accurately reflect the dynamic changes of flue gas components in the prior art. Device for dynamic concentration of components.

The purpose of the present invention is achieved through the following technical solutions:

A device for dynamically monitoring the concentration of smoke components during cigarette smoking, comprising a smoking machine, a two-way valve for the smoking machine, a multi-reflection gas absorption pool, a filter, a three-way valve and The cigarette support holder is connected with a fiber collimator, laser, laser current controller and laser temperature controller at the light incident end of the multiple reflection gas absorption cell, and is connected with a photoelectric sensor at the light receiving end of the multiple reflection gas absorption cell. detector, the laser current controller and the laser temperature controller are all connected to the computer, the photoelectric detector is connected to the computer through the data acquisition card, and the gas between the two-way valve of the smoking machine and the multiple reflection gas absorption pool A vacuum pump is connected to the road through a two-way valve of the vacuum pump.

The smoking machine is a linear smoking machine or a rotary table smoking machine, and the smoking machine can be single-channel or multi-channel. The suction power source of the smoking machine is a stepping motor.

The filter is a polytetrafluoroethylene (PTFE) membrane filter or a Cambridge filter.

The optical fiber collimator is connected to the multi-reflection gas absorption cell through a collimator end flange fixed adjustment seat, and there are three waist-shaped holes evenly distributed in the circumferential direction of the collimator end flange fixed adjustment seat, Three threaded holes are correspondingly processed on the end surface of the multiple reflection gas absorption cell; at the same time, one end surface of the flange fixing adjustment seat at the end of the collimator is designed as an inclined plane, which is used to fit one end surface of the multiple reflection gas absorption cell; three The screws are respectively installed in the three waist-shaped holes uniformly distributed on the circumference of the collimator end flange fixed adjustment seat, and at the same time, the inclined surface of the collimator end flange fixed adjustment seat is attached to the end surface of the multiple reflection gas absorption cell, and It is connected by three screws; when the light is incident from the centerline of the fiber collimator, it propagates along the centerline of the center hole on the flange of the collimator to fix the adjustment seat. Since the fitting surface of the collimator end flange fixed adjustment seat is an inclined surface, if the screw on the collimator end flange fixed adjustment seat is loosened at this time, and the collimator end flange fixed adjustment seat is rotated by a certain angle, Then the incident light will be rotated by a corresponding angle in a smaller arc, and at the same time, the position of the incident point of the incident light will also change.

The photoelectric detector is connected to the multi-reflection gas absorption cell through a detector end flange fixed adjustment seat, and there are three waist-shaped holes evenly distributed on the circumference of the detector end flange fixed adjustment seat, and the multiple reflection Three threaded holes are correspondingly processed on the end face of the gas absorption cell; at the same time, the end face of the fixed adjustment seat of the detector end flange is designed as an inclined plane, which is used to fit one end face of the multiple reflection gas absorption cell; the three screws are respectively installed The flange fixing and adjusting seat at the detector end is in three evenly distributed waist-shaped holes on the circumference, and at the same time, the inclined surface of the flange fixing and adjusting seat at the detector end is attached to the end surface of the multiple reflection gas absorption cell, and connected by three screws; When the light exits from the absorption cell, it propagates along the centerline of the center hole on the flange fixed adjustment seat at the quasi-detection end. Since the fitting surface of the detector end flange fixed adjustment seat is an inclined plane, if the detector is loosened at this time The screw on the adjusting seat fixed by the end flange, and the fixed adjusting seat on the detector end flange is rotated by a certain angle, then the outgoing light will be rotated by a corresponding angle in a smaller arc, and at the same time the exit point of the outgoing light will be The location has also changed.

The difference between the flange fixed adjustment seat at the collimator end and the flange fixed adjustment seat at the detector end is that the size hole designed in the middle of the flange fixed adjustment seat at the collimator end is a light hole, while the flange fixed adjustment seat at the photodetector end The seat hole is a threaded hole, because there is a corresponding external thread on the photodetector, so the threaded hole is used to connect the detector.

The model of the multiple reflection gas absorption cell is an integrated multiple reflection gas absorption cell, which is integrated by a detector, an optical fiber collimator and a multiple reflection gas absorption cell. The fiber collimator and the photodetector are integrated with the multi-reflection gas absorption cell through the corresponding collimator end flange fixing adjustment seat and the photodetector end flange fixing adjustment seat respectively.

The multiple reflection gas absorption cell can be one of the Heriott gas absorption cell and the White cell, and the volume is between 50-1000mL.

The data acquisition card is provided with a lock-in amplifier and an A/D converter inside the data acquisition card. The second harmonic absorption signal obtained through signal amplification and double frequency harmonic demodulation is sent to the computer after analog-to-digital conversion for processing and display .

The working mechanism and process of the device are as follows: the cigarette is sucked by the smoking machine, and the mainstream smoke of the cigarette enters the multi-reflection gas absorption pool after being filtered by the filter. At the same time, the light beam collimated by the fiber collimator is incident from the light entrance hole of the multiple reflection gas absorption cell, and after multiple reflections in the absorption cell, it exits the light exit hole and is then received by the photodetector. The photoelectric detector converts the optical signal into an electrical signal, and the electrical signal is sent to the data acquisition card. The signal is amplified by the lock-in amplifier, demodulated by double frequency, amplified by the preamplifier and digital-to-analog converted, and then enters the computer for data processing and display. . After the dynamic suction test is completed, the vacuum pump, two-way valve and three-way valve are coordinated and controlled, and nitrogen is used to clean the gas to be tested in the multiple reflection gas absorption cell and the residual gas in the suction pipeline.

The laser control process and principle are as follows, the laser is controlled by a laser current controller and a laser temperature controller. After the laser temperature controller sets the required temperature, the laser generates a laser beam with a specific wavelength. The laser current controller generates a sawtooth wave signal of tens of Hz, and the sawtooth wave signal controls a slow scanning current to complete the scanning of the absorption peak of the gas to be measured at a specific central wavelength. The scanning range is controlled by setting different starting current and ending current on the control interface. Modulation signal generator generates tens of kHz sine wave signal for modulation.

The feature of the present invention is that the integrated multi-reflection gas absorption cell can save the time for adjusting the optical path, and at the same time, because the optical path is fixed during the experiment, it is not easily disturbed by factors such as mechanical vibration, so that the output beam detected by the photoelectric detector is very stable. The accuracy and comparability of real-time detection of data will not be lost. This is especially important for dynamic detection. The flange fixed adjustment seat at the collimator end and the flange fixed adjustment seat at the photodetector end can be rotated at a certain angle for fine adjustment of the angle, which makes it more convenient to fine-tune the optical path. The laser scanning range is adjustable. By setting different scanning frequencies, gas concentration detection with high time resolution can be realized, that is, the changes of harmful smoke components in mainstream smoke can be dynamically analyzed in real time during the smoking process of detectable cigarettes. The device of the invention is easy to operate, has simple detection steps, can realize accurate dynamic monitoring, and the monitoring result has very important significance for in-depth exploration of the pyrolysis mechanism of cigarette combustion and evaluation of smoke toxicity.

Description of drawings

Figure 1 is a schematic diagram of an online detection device for the concentration of smoke components in cigarette smoking;

In Figure 1: 1. Stepping motor, 2. Smoking machine, 3. Vacuum pump two-way valve, 4. Vacuum pump, 5. Photoelectric detector, 6. Multiple reflection gas absorption cell, 7. Computer, 8. Laser current control Device, 9. Laser, 10. Temperature controller, 11. Optical fiber, 12. Optical fiber collimator, 13. Three-way valve, 14. Cigarette holder, 15. Cigarette, 16. Filter, 17. Smoking Machine two-way valve, 18. Data acquisition card.

Figure 2 is a schematic diagram of the connection end of the integrated absorption cell photodetector,

Among Fig. 2: 19. air outlet, 20. photodetector end flange fixed adjustment seat, 20-1. threaded hole, 20-2. waist-shaped hole.

Figure 3 is a schematic diagram of the connection end of the fiber collimator of the integrated absorption cell,

Among Fig. 3: 21. air inlet, 22. fiber collimator end flange fixed adjustment seat, 22-1. light hole, 22-2. waist hole.

Fig. 4 is a schematic diagram of the structure of the flange fixing adjustment seat at the photodetector end, c, d, and e are the full sectional view, the front view and the left view, respectively.

Fig. 5 is a schematic diagram of the structure of the flange fixing adjustment seat at the end of the fiber collimator, f, g, and h are the full sectional view, the front view and the left view, respectively.

Figure 6 is a schematic diagram of the second harmonic tuning.

Figure 7 is the TDLAS (Tunable Diode Laser Absorption Spectroscopy) computer control panel interface.

Figure 8 is the dynamic detection curve of the concentration of smoke components during cigarette smoking.

Figure 9 is the difference curve of the dynamic detection curve of the smoke component concentration during cigarette smoking.

Detailed ways

The present invention is further described below in conjunction with accompanying drawing:

As shown in Figure 1: a device for dynamically monitoring the concentration of smoke components in the process of cigarette smoking, which includes a smoking machine 2, a two-way valve 17 for the smoking machine, and a multi-reflection gas absorption pool connected in sequence according to the flow direction of the smoke suction 6. A filter 16, a three-way valve 13 and a cigarette holder 14 are connected to the light incident end of the multiple reflection gas absorption pool 6 with a fiber collimator 12, a laser 9, a laser current controller 8 and a laser temperature controller. A device 10, a photodetector 5 is connected to the light receiving end of the multiple reflection gas absorption cell, and the laser current controller 8 and the laser temperature controller 10 are all connected to the computer 7, and the photodetector 5 is connected to the computer 7 through data acquisition. The card 18 is connected with the computer 7, and the vacuum pump 4 is connected through the two-way valve 3 on the air path between the two-way valve 17 of the smoking machine and the multiple reflection gas absorption pool 6.

In the present invention, the optical fiber collimator 12 and the multiple reflection gas absorption cell 6 are connected through a fiber collimator flange fixing adjustment seat 22, and the photodetector 5 and the multiple reflection gas absorption cell 6 are connected by a A photodetector flange fixed adjustment seat 20 is connected, and three arc-shaped waist-shaped holes are symmetrically processed on the fiber collimator flange fixed adjustment seat 22 and the photodetector flange fixed adjustment seat 20 to increase the flange Angle of rotation during installation. There are three waist-shaped holes 22-2 evenly distributed on the circumference of the collimator end flange fixed adjustment seat 22, and three threaded holes are correspondingly processed on the end surface of the multiple reflection gas absorption cell, and the collimator end flange fixed adjustment seat One end is designed as an inclined plane, and the inclined plane is used to fit one end face of the multiple reflection gas absorption cell. The three screws are respectively installed in the three uniformly distributed waist-shaped holes on the circumference of the collimator end flange fixing adjustment seat, and at the same time, the slope of the collimator end flange fixing adjustment seat is attached to the end surface of the multiple reflection gas absorption cell , at this time tighten the three screws to connect the two end faces. The light is incident from the centerline of the fiber collimator, and propagates along the centerline of the center hole on the fixed adjustment base of the flange at the end of the collimator. Since the fitting surface of the collimator end flange fixed adjustment seat is an inclined surface, if the screw on the collimator end flange fixed adjustment seat is loosened at this time, and the collimator end flange fixed adjustment seat is rotated by a certain angle, Then the incident light will be rotated by a corresponding angle in a smaller arc, and at the same time, the position of the incident point of the incident light will also change. The flange fixed adjustment seat at the photodetector end is different from the flange fixed adjustment seat at the collimator end, and the other details are identical. The difference is that the size hole designed in the middle of the collimator end flange fixing adjustment seat 22 is the light hole 22-1, while the photodetector end flange fixing adjustment seat 20 hole is a threaded hole 20-1, because the photodetector 5 There is a corresponding external thread, so the threaded hole is used to connect the detector. From the full sectional view c in Figure 4 and the full sectional view f in Figure 5, the difference in structure can be clearly seen. The hole in the full sectional view c is a threaded hole, and the hole in the full sectional view f is a light hole. The threaded hole of the flange fixing adjustment seat at the photodetector end can be directly connected with the photodetector with external thread, and the light hole is used to pass through the fiber collimator, and then the threaded hole on the fiber collimator and the fiber collimator Straightener flange fixed adjustment seat connection.

The fiber collimator 12 and the photodetector 5 are integrated with the multiple reflection gas absorption cell 6 through the corresponding collimator end flange fixing adjustment seat 22 and the photodetector end flange fixing adjustment seat 20 respectively. Refer to Figures 2, 3, 4, and 5 for specific structures.

The detection process and working principle of this device are described as follows:

The smoke sampling system is based on a commercial smoking machine2. The experiment adopts the restrictive smoking mode in accordance with ISO requirements, that is, each cigarette is puffed one by one, the puffing time of each puff is 2s, the puffing volume is 35mL of smoke, and the next puff is puffed after an interval of 58s. Fixed suction 6 mouthfuls. In order to eliminate the interference caused by lighting cigarettes, an electronic automatic cigarette lighting method was used in the experiment. The smoking of the cigarette is completed by the piston driven by the stepper motor 1 . The PTFE filter can filter out particles greater than or equal to 0.22um. The Cambridge filter can filter out standard particles greater than or equal to 0.30um DOP, and the retention rate is greater than 99.9%. It is a special filter medium for the global cigarette standard "Cambridge filter method". Particles and nicotine during cigarette smoking are intercepted, and tar and nicotine contents are determined by HPLC. The sucked flue gas first passes through a Cambridge filter or a polytetrafluoroethylene (PTFE) membrane filter to filter out particulate matter to prevent contamination of the optical system, and then enters the multiple reflection gas absorption cell 6 through the three-way valve 13 .

The multi-reflection gas absorption cell 6 can be used for detection of gas concentration in both fixed and open light paths. The multi-reflection gas absorption cell 6 can be a type of HT-3S, HT-10M, HT-15L gas absorption cell or one of other Heriott gas absorption cells and White cells. The volume of the multi-reflection gas absorption cell is between 50-1000mL.

The laser current controller 8 and the temperature controller 10 provide the laser 9 with a sawtooth wave scanning signal of 50 Hz and a sine wave modulation signal of 40 KHz, and the output wavelength of the laser 9 scans near the central absorption wavelength of the gas to be measured. The laser beam passes through the multiple reflection gas absorption cell 6 and is focused onto the photodetector 5 after multiple reflections. The weak signal captured by the photodetector 5 is amplified by a lock-in amplifier and demodulated by a double frequency harmonic to obtain a second harmonic absorption signal. Finally, it is sent to the computer 7 for processing after A/D conversion.

After the detection is completed, the two-way valve 17 is closed, the two-way valve 3 is opened, the three-way valve 13 is switched and connected to the nitrogen cylinder, and the cleaning of the multiple reflection gas absorption pool 6 is completed under the suction of the vacuum pump 4 for the next mouthful. Get ready for smoke testing.

As shown in Figures 2 and 3, the fiber collimator is connected to the light incident end of the multiple reflection gas absorption cell 6 through the fiber collimator flange fixing adjustment seat, and the photodetector 5 is fixed to the adjustment seat through the photodetector end flange Fixed at the light exit end of the multi-reflection gas absorption cell 6, this new design saves the time for adjusting the optical path, and at the same time, because the optical path is fixed during the experiment, it is not easily disturbed by factors such as mechanical vibration, so that the output beam detected by the detector is very Stable, so as not to lose the accuracy and comparability of real-time data detection.

When light is incident from the fiber collimator, the light propagates along the dotted line in the center of Figure 5. If the screw on Figure 5 is adjusted at this time, the fiber collimator flange fixing adjustment seat in Figure 5 is rotated by a certain amount. Angle, the incident light will be rotated by the corresponding angle in a smaller arc. By changing the angle of rotation in Figure 5, the angle of the incident light can be adjusted, and of course the position of the incident point changes accordingly during the adjustment process. At the same time, at the light exit end, rotating the photodetector end flange fixing adjustment seat in Figure 4 can also fine-tune the position and angle of the square photosensitive surface on the photodetector, so that the photosensitive surface of the photodetector receives the outgoing light. Light, to achieve light reception and photoelectric conversion.

As shown in Figures 6 and 7, set the controller temperature on the control panel so that the laser generates a laser beam with a certain center wavelength. At the same time, set the start current and cut-off current on the scan current adjustment panel to realize the scan in a small range around the center wavelength. The central wavelength corresponds to the wavelength of the gas to be measured, and the range of the sweep current is determined by the half-width of the absorption line function of the gas to be measured and the avoidance of cross-interference from other gases.

The laser is controlled by a laser current controller and a laser temperature controller. After the laser temperature controller sets the required temperature, the laser generates a laser beam with a specific wavelength. The laser current controller generates a sawtooth wave signal of tens of Hz, and the sawtooth wave signal controls a slow scanning current to complete the scanning of the absorption peak of the gas to be measured at a specific central wavelength. The scanning range is controlled by setting different starting current and ending current on the control interface. Modulation signal generator generates tens of kHz sine wave signal for modulation. The modulation signal drives the laser to generate a corresponding beam, which is reflected multiple times in the multiple reflection gas absorption cell and then emerges from the light exit hole, and then is received by the photodetector. The photoelectric detector converts the optical signal into an electrical signal, and the electrical signal is sent to the data acquisition card. The signal is amplified by the lock-in amplifier, demodulated by double frequency, amplified by the preamplifier and digital-to-analog converted, and then enters the computer for data processing and display. . After the concentration calibration, the gas concentration can be obtained.

The effect diagram of the whole monitoring is shown in Fig. 8 and Fig. 9. Fig. 8 is a dynamic detection curve of the smoke component concentration during cigarette smoking, reflecting the dynamic change trend of the smoke component concentration during cigarette smoking. Figure 9 is the difference curve of the dynamic detection curve of the smoke component concentration during cigarette smoking, which reflects the change rate of the gas component concentration. The device of the invention is easy to operate, has simple detection steps, and can realize accurate dynamic monitoring of gas. The monitoring results are of great significance for in-depth exploration of the combustion pyrolysis mechanism of cigarettes. At the same time, the detection of harmful gases in cigarette smoke can better evaluate the toxicity of smoke .

Claims (8)

1. The utility model provides a device of smoke component concentration in dynamic monitoring cigarette smoking process which characterized in that: the smoke sucking machine comprises a smoke sucking machine, a two-way valve of the smoke sucking machine, a multi-reflection gas absorption pool, a filter disc, a three-way valve and a cigarette holder which are sequentially communicated according to the smoke sucking flow direction, wherein a light incidence end of the multi-reflection gas absorption pool is connected with an optical fiber collimator, a laser current controller and a laser temperature controller, a light receiving end of the multi-reflection gas absorption pool is connected with a photoelectric detector, the laser current controller and the laser temperature controller are connected with a computer, the photoelectric detector is connected with the computer through a data acquisition card, and a vacuum pump is connected on a gas path between the two-way valve of the smoke sucking machine and the multi-reflection gas absorption pool through the two-way valve;

the optical fiber collimator is connected with the multi-reflection gas absorption pool through a collimator end flange fixing and adjusting seat, three waist-shaped holes are uniformly distributed in the circumferential direction of the collimator end flange fixing and adjusting seat, and three threaded holes are correspondingly processed on the end face of the multi-reflection gas absorption pool; meanwhile, one end face of the collimator end flange fixed adjusting seat is designed into an inclined plane, and the inclined plane is used for being attached to one end face of the multi-reflection gas absorption cell; three screws are respectively arranged in three uniformly distributed kidney-shaped holes on the circumference of the collimator end flange fixing and adjusting seat, and meanwhile, the inclined plane of the collimator end flange fixing and adjusting seat is attached to the end face of the multi-reflection gas absorption tank and is connected with the end face of the multi-reflection gas absorption tank through the three screws; when light rays are incident from the central line of the optical fiber collimator and are transmitted along the central line of the central hole in the collimator end flange fixing adjusting seat, because the binding surface of the collimator end flange fixing adjusting seat is an inclined surface, if the screw on the collimator end flange fixing adjusting seat is loosened, and the collimator end flange fixing adjusting seat is rotated for a certain angle, the incident light rays can rotate for a corresponding angle on a smaller radian, and meanwhile, the position of the incident point of the incident light rays is also changed;

the photoelectric detector is connected with the multi-reflection gas absorption pool through a detector end flange fixing and adjusting seat, three waist-shaped holes are uniformly distributed in the circumferential direction of the detector end flange fixing and adjusting seat, and three threaded holes are correspondingly processed on the end face of the multi-reflection gas absorption pool; meanwhile, one end face of the detector end flange fixed adjusting seat is designed into an inclined plane, and the inclined plane is used for being attached to one end face of the multiple reflection gas absorption cell; three screws are respectively arranged in three uniformly distributed waist-shaped holes on the circumference of the detector end flange fixing and adjusting seat, and meanwhile, the inclined plane of the detector end flange fixing and adjusting seat is attached to the end face of the multi-reflection gas absorption cell and is connected with the end face of the multi-reflection gas absorption cell through the three screws; when light rays are emitted from the absorption cell, the light rays are transmitted along the central line of the central hole in the fixed adjusting seat of the end flange of the detector, and because the binding surface of the fixed adjusting seat of the end flange of the detector is an inclined surface, if the screw on the fixed adjusting seat of the end flange of the detector is loosened, the fixed adjusting seat of the end flange of the detector is rotated for a certain angle, the emitted light rays can rotate for a corresponding angle on a smaller radian, and meanwhile, the position of an emergent point of the emitted light rays is also changed.

2. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: the multi-reflection gas absorption cell is one of a white cell and a Herriott gas absorption cell, and the volume of the multi-reflection gas absorption cell is 50-1000 mL.

3. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: the smoking machine is a linear smoking machine or a rotating disc type smoking machine, and can be a single channel or a multi-channel smoking machine.

4. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: the filter disc is a Polytetrafluoroethylene (PTFE) film filter disc or a Cambridge filter disc.

5. The device for dynamically monitoring the concentration of smoke components in the smoking process of a cigarette according to claim 1 or 3, wherein: the power source of the smoking machine is a stepping motor.

6. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: the central hole of the fixed adjusting seat of the end flange of the detector is a threaded hole which is convenient to be connected with the external thread on the photoelectric detector.

7. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: the optical fiber collimator and the photoelectric detector are integrated with the multi-reflection gas absorption cell through a corresponding collimator end flange fixed adjusting seat and a corresponding photoelectric detector end flange fixed adjusting seat.

8. The device for dynamically monitoring the concentration of smoke constituents in the smoking process of a cigarette according to claim 1, wherein: a phase-locked amplifier and an A/D converter are arranged in the data acquisition card; and a second harmonic absorption signal obtained by signal amplification and double-frequency harmonic demodulation is transmitted to a computer after analog-to-digital conversion so as to complete processing and display.

Images