CN106404694B - Device for dynamically monitoring smoke component concentration in cigarette smoking process - Google Patents
Device for dynamically monitoring smoke component concentration in cigarette smoking process Download PDFInfo
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- CN106404694B CN106404694B CN201610998074.8A CN201610998074A CN106404694B CN 106404694 B CN106404694 B CN 106404694B CN 201610998074 A CN201610998074 A CN 201610998074A CN 106404694 B CN106404694 B CN 106404694B
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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
Technical Field
The invention relates to a gas concentration detection device, in particular to a device for dynamically monitoring the concentration of smoke components in the smoking process of cigarettes.
Background
During smoking, cigarettes in a high-temperature combustion area, a distillation cracking area or a low-temperature condensation area all contain a series of complex physical and chemical changes. Cigarette smoke is an aerosol generated in the burning process of cigarettes and is one of the systems with the most complex known compositions. The main stream smoke is smoke passing through the filter tip of the cigarette during smoking, harmful components of the smoke can directly act on human organs, the category and the content of the harmful components are used for judging smoke toxicity, and the release amount of related smoke components can be used for reflecting the combustion state of the cigarette. However, the components and concentrations of cigarette smoke are constantly in a dynamic process as the smoking process progresses. The cigarette combustion state has close correlation with the smoke chemistry. Therefore, the method for detecting the real-time dynamic change of the harmful smoke components in the mainstream smoke of the cigarette in the smoking process has very important significance for deeply exploring the cigarette combustion pyrolysis mechanism and evaluating the smoke toxicity. There is a need for a device for real-time on-line monitoring of the concentration of smoke constituents during a smoking process.
Disclosure of Invention
The invention mainly solves the technical problems that in the prior art, the pretreatment of a sample is time-consuming, the detection steps are complicated, and the dynamic change of smoke components cannot be accurately reflected, and provides a convenient and quick device for representing the dynamic concentration of the smoke components.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a device of dynamic monitoring cigarette smoking in-process flue gas component concentration, according to the flue gas suction flow direction including the smoking machine, smoking machine two-way valve, the gaseous absorption cell of multiple reflection, filter disc, three-way valve and the cigarette holder that communicate in proper order, be connected with optical collimator, laser instrument and laser current controller and laser temperature controller at the light incident end of the gaseous absorption cell of multiple reflection, be connected with photoelectric detector at the light receiving end of the gaseous absorption cell of multiple reflection, laser current controller, laser temperature controller all are connected with the computer, photoelectric detector passes through data acquisition card and is connected with the computer, is connected with the vacuum pump through vacuum pump two-way valve on the gas circuit between smoking machine two-way valve and the gaseous absorption cell of multiple reflection.
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. The suction power source of the smoking machine is a stepping motor.
The filter disc is a Polytetrafluoroethylene (PTFE) film filter disc or a Cambridge filter disc.
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 enters from the center line of the optical fiber collimator, the light is transmitted along the center line of the center hole in the fixed adjusting seat of the end flange of the collimator. Because the binding face of the collimator end flange fixing and adjusting seat is an inclined face, if the screw on the collimator end flange fixing and adjusting seat is loosened, the collimator end flange fixing and adjusting seat is rotated by a certain angle, the incident light can rotate by a corresponding angle on a smaller radian, and meanwhile, the position of the incident point of the incident light 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 is emitted from the absorption tank, the light is transmitted along the central line of the central hole in the fixed adjusting seat of the quasi-detection end flange, and because the binding surface of the fixed adjusting seat of the detector end flange is an inclined surface, if the screw on the fixed adjusting seat of the detector end flange is loosened, the fixed adjusting seat of the detector end flange is rotated by a certain angle, the emitted light can rotate by a corresponding angle on a smaller radian, and meanwhile, the position of an emergent point of the emitted light is also changed.
The difference between the collimator end flange fixing and adjusting seat and the detector end flange fixing and adjusting seat is that a size hole designed in the middle of the collimator end flange fixing and adjusting seat is a unthreaded hole, and a photoelectric detector end flange fixing and adjusting seat hole is a threaded hole, and the threaded hole is used for connecting a detector because the photoelectric detector is provided with corresponding external threads.
The type of the multi-reflection gas absorption cell is an integrated multi-reflection gas absorption cell, and the multi-reflection gas absorption cell is integrated with a detector, an optical fiber collimator and the multi-reflection gas absorption cell. 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.
The multi-reflection gas absorption cell can be one of a Herriott gas absorption cell and a white cell, and the volume of the multi-reflection gas absorption cell is 50-1000 mL.
The data acquisition card is internally provided with a lock-in amplifier and an A/D converter. Second harmonic absorption signal obtained by signal amplification and double frequency harmonic demodulation, and analog-to-digital conversionTransmitting to computer for processing and display。
The working mechanism and the process of the device are as follows: the smoking machine sucks the cigarette, and the mainstream smoke of the cigarette enters the multi-reflection gas absorption tank after being filtered by the filter disc. Meanwhile, the light beams collimated by the optical fiber collimator enter from the light inlet hole of the multi-reflection gas absorption cell, are reflected for multiple times in the absorption cell and then exit from the light outlet hole, and are received by the photoelectric detector. The photoelectric detector converts the optical signal into an electric signal, the electric signal is sent to the data acquisition card, and the signal is amplified by the lock-in amplifier, demodulated by the double frequency, amplified by the preamplifier and converted by the digital-analog to enter the computer for data processing and display. After the dynamic suction detection is finished, the vacuum pump, the two-way valve and the three-way valve are controlled in a coordinated mode, and the gas to be detected in the multi-reflection gas absorption pool and the residual gas in the suction pipeline are cleaned by using nitrogen.
The laser control process and principle are as follows, and 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 dozens 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 with the specific central wavelength. The scanning range is controlled by setting different starting current and ending current by the control interface. The modulation signal generator generates a sine wave signal of tens of kHz for modulation.
The invention is characterized in that: the time of adjusting the light path can be saved to gaseous absorption cell of integrated form multiple reflection, simultaneously because the light path is fixed in the experimentation, is difficult for receiving factor interference such as mechanical vibration, lets the output light beam that photoelectric detector detected very stable, is unlikely to lose data real-time detection's accuracy and comparability. This is particularly important for dynamic detection. The collimator end flange fixing and adjusting seat and the photoelectric detector end flange fixing and adjusting seat can rotate at a certain angle to finely adjust the angle, so that the fine adjustment of the light path is more convenient. The laser scanning range is adjustable. By setting different scanning frequencies, the gas concentration detection with high time resolution can be realized, namely, the change condition of harmful smoke components in mainstream smoke can be dynamically analyzed in real time in the process of detecting the smoking of cigarettes. The device is simple and convenient to operate, the detection steps are simple, accurate dynamic monitoring can be realized, and the monitoring result has very important significance for deeply exploring the cigarette combustion pyrolysis mechanism and evaluating the smoke toxicity.
Drawings
FIG. 1 is a schematic view of an on-line detection device for the concentration of smoke components in cigarette smoking;
in fig. 1: 1. the system comprises a stepping motor, 2. A smoking machine, 3. A vacuum pump two-way valve, 4. A vacuum pump, 5. A photoelectric detector, 6. A multi-reflection gas absorption pool, 7. A computer, 8. A laser current controller, 9. A laser, 10. A temperature controller, 11. An optical fiber, 12. An optical fiber collimator, 13. A three-way valve, 14. A cigarette holder, 15. A cigarette, 16. A filter disc, 17. A smoking machine two-way valve and 18. A data acquisition card.
Figure 2 is a schematic diagram of the integrated absorption cell photodetector connection,
in fig. 2: 19. the gas outlet hole, 20, the photoelectric detector end flange fixing adjusting seat, 20-1, the threaded hole and 20-2, the waist-shaped hole.
Figure 3 is a schematic diagram of the connection end of an integrated absorption cell fiber collimator,
in fig. 3: 21. air inlet hole, 22, optical fiber collimator end flange fixing adjusting seat, 22-1, light hole, 22-2, kidney-shaped hole.
Fig. 4 is a schematic structural view of the fixing and adjusting seat for the end flange of the photodetector, and c, d, and e are respectively a full sectional view, a front view and a left view thereof.
Fig. 5 is a schematic structural view of a flange fixing and adjusting seat at the end of the optical fiber collimator, wherein f, g, and h are respectively a full sectional view, a front view and a left view thereof.
Fig. 6 is a diagram of a second harmonic tuning schematic.
FIG. 7 is a TDLAS (Tunable Diode Laser Absorption Spectroscopy) computer control panel interface.
FIG. 8 is a graph showing the dynamic measurement of smoke constituent concentration during smoking of a cigarette.
FIG. 9 is a differential plot of a dynamic profile of smoke constituent concentration during smoking of a cigarette.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1: the utility model provides a device of dynamic monitoring cigarette smoking in-process smoke constituent concentration, according to the smoke suction flow direction including the smoking machine 2, smoking machine two-way valve 17, the gaseous absorption cell 6 of multiple reflection, filter disc 16, three-way valve 13 and the cigarette holder 14 that communicate in proper order, be connected with optical collimator 12, laser 9 and laser current controller 8 and laser temperature controller 10 at the light incident end of the gaseous absorption cell 6 of multiple reflection, be connected with photoelectric detector 5 at the light receiving end of the gaseous absorption cell of multiple reflection, laser current controller 8, laser temperature controller 10 all are connected with computer 7, photoelectric detector 5 is connected with computer 7 through data acquisition card 18, are connected with vacuum pump 4 through two-way valve 3 on the gas circuit between smoking machine two-way valve 17 and the gaseous absorption cell 6 of multiple reflection.
In the invention, the optical fiber collimator 12 is connected with the multi-reflection gas absorption cell 6 through an optical fiber collimator flange fixing and adjusting seat 22, the photoelectric detector 5 is connected with the multi-reflection gas absorption cell 6 through a photoelectric detector flange fixing and adjusting seat 20, and three arc-shaped waist-shaped holes are symmetrically processed on the optical fiber collimator flange fixing and adjusting seat 22 and the photoelectric detector flange fixing and adjusting seat 20 to increase the rotation angle of the flange plate during installation. Three kidney-shaped holes 22-2 are uniformly distributed on the circumference of the collimator end flange fixing adjusting seat 22, three threaded holes are correspondingly processed on the end surface of the multi-reflection gas absorption cell, and one end of the collimator end flange fixing adjusting seat is designed into an inclined surface which is used for being attached to one end surface 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 simultaneously, the inclined plane of the collimator end flange fixing and adjusting seat is attached to the end face of the multi-reflection gas absorption cell, and at the moment, the three screws are fastened to be connected by two end faces. Light rays are incident from the center line of the optical fiber collimator and are transmitted along the center line of the center hole in the fixed adjusting seat of the flange at the end of the collimator. Because the binding face of the collimator end flange fixing adjusting seat is an inclined face, if the screw on the collimator end flange fixing adjusting seat is loosened, the collimator end flange fixing adjusting seat is rotated by a certain angle, the incident light can rotate by a corresponding angle on a smaller radian, and meanwhile, the position of the incident point of the incident light is also changed. The fixed adjusting seat of the end flange of the photoelectric detector is different from the fixed adjusting seat of the end flange of the collimator in one place, and other details are completely the same. The difference is that the hole of the collimator end flange fixing and adjusting seat 22 is a unthreaded hole 22-1, the hole of the photoelectric detector end flange fixing and adjusting seat 20 is a threaded hole 20-1, and the threaded hole is used for connecting the detector because the photoelectric detector 5 is provided with corresponding external threads. The difference in structure is clearly seen from the full sectional view c in fig. 4, in which the holes are threaded holes, and the full sectional view f in fig. 5, in which the holes are unthreaded holes. The threaded hole of the fixing and adjusting seat of the end flange of the photoelectric detector can be directly connected with the photoelectric detector with external threads, and the unthreaded hole is used for penetrating through the optical fiber collimator and then is connected with the fixing and adjusting seat of the flange of the optical fiber collimator through the threaded hole on the optical fiber collimator.
The optical fiber collimator 12 and the photoelectric detector 5 are integrated with the multi-reflection gas absorption cell 6 respectively through a collimator end flange fixing and adjusting seat 22 and a photoelectric detector end flange fixing and adjusting seat 20. The specific structure is shown in fig. 2, 3, 4 and 5.
The detection process and the working principle of the device are explained as follows:
the smoke sampling system is built on the basis of a commercial smoking machine 2. The experiment adopts a restrictive smoking mode according to ISO requirements, namely, each cigarette is smoked mouth by mouth, the smoking time of each mouth is 2s, the smoking volume is 35mL smoke, the next mouth of smoking is carried out after 58s interval, and each cigarette is smoked for 6 mouths fixedly. In order to eliminate the interference caused by cigarette lighting, an electronic automatic cigarette lighting mode is adopted in the experiment. The cigarette is sucked by the piston driven by the stepping motor 1. The PTFE filter can filter out particulate matter of more than or equal to 0.22 um. The Cambridge filter can filter out DOP standard particles with the rejection rate of more than or equal to 0.30um of more than 99.9 percent, and is a special filter medium of global cigarette standard Cambridge filter method. The sucked flue gas firstly filters particulate matters through a Cambridge filter or a Polytetrafluoroethylene (PTFE) film filter to prevent the optical system from being polluted, and then enters the multi-reflection gas absorption cell 6 through the three-way valve 13.
The multi-reflection gas absorption cell 6 can be used for both fixed and open path gas concentration detection. The multiple reflection gas absorption cell 6 may be one of HT-3S, HT-10M, HT-15L, or other Herriott gas absorption cells and white cells. The volume of the multi-reflection gas absorption cell is between 50 and 1000 mL.
The laser current controller 8 and the temperature controller 10 provide 50Hz sawtooth wave scanning signals and 40KHz sine wave modulation signals for the laser 9, and the output wavelength of the laser 9 is scanned near the central absorption wavelength of the gas to be measured. The laser beam passes through the multi-reflection gas absorption cell 6, is focused on the photoelectric detector 5 after being reflected for multiple times. The weak signal captured by the photoelectric detector 5 is amplified by the phase-locked amplifier and demodulated by the double frequency harmonic wave to obtain a second harmonic wave absorption signal. Finally, the data is sent to a computer 7 for processing through A/D conversion.
After the detection is finished, the two-way valve 17 is closed, the two-way valve 3 is opened, the switching position of the three-way valve 13 is connected with the nitrogen cylinder, the cleaning work of the multi-reflection gas absorption pool 6 is finished under the suction action of the vacuum pump 4, and the preparation is made for the detection of the next smoke.
As shown in fig. 2 and 3, the optical fiber collimator is connected at the light incident end of the multiple reflection gas absorption tank 6 through the optical fiber collimator flange fixing adjusting seat, the photoelectric detector 5 is fixed at the light emergent end of the multiple reflection gas absorption tank 6 through the photoelectric detector end flange fixing adjusting seat, the time for adjusting the light path is saved by the novel design, meanwhile, the light path is fixed in the experiment process, the interference caused by factors such as mechanical vibration is not easy to be received, the output light beam detected by the detector is very stable, and the accuracy and comparability of data real-time detection are not lost.
When light enters from the optical fiber collimator, the light propagates along the center-point scribe line of fig. 5, and if the screw of fig. 5 is adjusted to rotate the flange fixing adjusting seat of the optical fiber collimator in fig. 5 by a certain angle, the incident light rotates by a corresponding angle in a smaller arc. The incident angle of the incident light can be adjusted by changing the angle of the rotating graph 5, and the position of the incident point is correspondingly changed in the adjusting process. Meanwhile, at the light ray outgoing end, the photoelectric detector end flange fixing adjusting seat in fig. 4 is rotated, and the position and the angle of the square photosensitive surface on the photoelectric detector can be finely adjusted, so that the photosensitive surface of the photoelectric detector receives outgoing light rays, and the light rays are received and subjected to photoelectric conversion.
As shown in fig. 6 and 7, the controller temperature is set on the control panel so that the laser generates a laser beam of a certain center wavelength. While setting the start current and the off current at the scan current adjusting panel for realizing the scanning 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 scanning current is determined according to the half width of the absorption line function of the gas to be measured and the avoidance of cross interference of 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 dozens 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 with the specific central wavelength. The scanning range is controlled by setting different starting current and ending current by the control interface. The modulation signal generator generates a sine wave signal of tens of kHz for modulation. The modulation signal drives the laser to generate a corresponding light beam, and the light beam is reflected for multiple times in the multiple-reflection gas absorption cell and then is emitted from the light outlet hole, and then is received by the photoelectric detector. The photoelectric detector converts the optical signal into an electric signal, the electric signal is sent to the data acquisition card, and the signal is amplified by the lock-in amplifier, demodulated by the double frequency, amplified by the preamplifier and converted by the digital-analog to enter the computer for data processing and display. And then the gas concentration can be obtained after concentration calibration.
The effect of the whole monitoring is shown in fig. 8 and fig. 9. Fig. 8 is a dynamic detection curve of smoke component concentration in the process of smoking a cigarette, which reflects the dynamic variation trend of smoke component concentration in the process of smoking a cigarette. FIG. 9 is a differential plot of a dynamic detection curve of smoke component concentration during cigarette smoking, the rate of change of reactive gas component concentration. The device is simple and convenient to operate, the detection steps are simple, the gas can be accurately and dynamically monitored, the monitoring result has important significance for deeply exploring the cigarette combustion pyrolysis mechanism, and the harmful gas in the cigarette smoke can be detected to better evaluate the smoke toxicity.
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.
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