CN112557269A - Probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method - Google Patents
Probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method Download PDFInfo
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Abstract
The invention provides a probing type receiving and transmitting integrated optical fiber dust concentration measuring device and a probing type receiving and transmitting integrated optical fiber dust concentration measuring method. The receiving and transmitting integrated optical fiber measuring probe comprises a probe optical fiber bundle with a Y-shaped structure and a measuring probe tip, and the signal generating and processing control module comprises a laser, a laser driver, a temperature controller, a main controller, a display, an avalanche type detector, a signal processor and a data acquisition device. Through the design of the probing type receiving and transmitting integrated optical fiber measuring probe, the measuring end can be probed into a specific measuring area in a complex limited space to measure the dust concentration. The measuring mode of the all-fiber optical path not only meets the working condition in a narrow space, but also effectively avoids the instability of a laser light source, a detector, a signal processing circuit and the like in a complex special environment.
Description
Technical Field
The invention relates to the technical field of dust concentration detection, in particular to a probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method.
Background
Measurement of flow parameters of gas-solid two-phase flows has been a difficult problem: on one hand, the measurement methods of various dust concentrations have limitations in principle, and certain errors exist in measurement results. On the other hand, dust particle flow parameter measurement is often accompanied by severe field conditions, and most measurement systems can obtain better measurement results under strict laboratory conditions, but the effect in field actual operation is not satisfactory. In order to verify the reliability of the dry powder fire extinguishing system in the power cabin of the transportation vehicles such as airplanes and the like, the concentration of fire extinguishing agent particles in a complex protected space needs to be detected in real time.
At present, various dust detection devices at home and abroad, such as LD-5C type microcomputer laser dust meters, ATM-2000 laser dust concentration meters, JFC-1 laser dust concentration meters and the like, are mainly used for detecting the concentration of particles in atmospheric environment and industrial places, and are difficult to realize real-time measurement of high-concentration dust in a complex restricted space under severe environment conditions. In a special environment of a protected complex limited space, such as the influence of factors such as high temperature, high humidity and vibration on electronic elements of the measuring device, the instability of a signal processing circuit is caused, the accuracy of a measuring result cannot be ensured, and the anti-interference capability is poor.
In the prior art, a patent "powder base agent measuring system" (CN 101858846 a) discloses a measuring system for a dry powder agent, wherein a dry powder agent sensor head of the measuring system is very likely to cause dust accumulation, block a measuring light path and influence a measuring result in the measurement of a high-concentration dust environment in a complex limited space. And the equipment control system is too complex, and the equipment is not beneficial to miniaturization and carrying. Patent "a reflection type optic fibre dust concentration measurement system" (CN 106769738A) provides a reflection type optic fibre dust concentration measurement device, including measuring part, light source part, directional coupling part, signal conversion part. (Liuhai Strong et al. fiber dust concentration measurement research based on two-optical-path differential measurement [ J ] applied optics, 2019,40(01): 167-. The optical measurement part is fixed, the laser adjustment end and the reflection end are fixedly connected through the connecting rod, the applicability is poor, and the high-concentration dust in a required specific area cannot be detected in real time in a complex limited space.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a probing type receiving and transmitting integrated optical fiber dust concentration measuring device and method. The measuring mode of the all-fiber optical path not only meets the working condition in a narrow space, but also effectively avoids the instability of a laser light source, a detector, a signal processing circuit and the like in a complex special environment, ensures the accuracy of the measuring result and has stronger anti-interference capability.
The technical scheme of the invention is as follows: a probing type receiving and transmitting integrated optical fiber dust concentration measuring device comprises a receiving and transmitting integrated optical fiber measuring probe and a signal generating and processing control module, wherein the receiving and transmitting integrated optical fiber measuring probe is connected with the signal generating and processing control part through an optical fiber cable. The receiving and transmitting integrated optical fiber measuring probe comprises a Y-shaped probe optical fiber bundle and a measuring probe tip, and the signal generating and processing control module comprises a laser, a laser driver, a temperature controller, a main controller, a display, an avalanche type detector, a signal processor and a data acquisition device.
The Y-shaped probe optical fiber bundle is formed by converging a plurality of transmitting end light source optical fiber bundles and a plurality of receiving end detecting optical fiber bundles through an optical fiber coupler, the converging end of the Y-shaped probe optical fiber bundle is connected with the tip end of the probe in a nested manner, the tip end of the measuring probe is of a hollow cylindrical structure with a plurality of wall holes arranged in the circumferential direction, and dust accumulation in a high-concentration dust environment can be avoided through the through type measuring space. The rear end of the interior of the Y-shaped probe optical fiber bundle converging end is sequentially provided with a lens and a reflector.
And the output end of the main controller is connected with the input ends of the laser driver and the temperature controller. The output ends of the laser driver and the temperature controller are connected with the input end of the laser. The output end of the laser is connected with the light source optical fiber bundle at the transmitting end through an optical fiber jumper, the detection optical fiber bundle at the receiving end is connected with the input end of the avalanche detector through the optical fiber jumper, the output end of the avalanche detector is connected with the input end of the data acquisition card through a signal processor, and the data acquisition card is interactively connected with the main controller. And the input end of the display is connected with the output end of the main controller.
The probing type receiving and transmitting integrated optical fiber dust concentration measuring device adopts a laser light source which adopts visible light red light with the wavelength of 650 nm. When the device is used for detecting the dust environment with the concentration lower than a certain threshold value, the current value passing through the laser can be increased through the laser driver so as to increase the initial light intensity; when the device is used for detecting a dust environment with the concentration higher than a certain threshold value, the current value passing through the laser can be reduced by the laser driver so as to reduce the initial light intensity.
The probing type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the optimal number of the transmitting end light source optical fiber bundles and the optimal number of the receiving end detection optical fiber bundles is as follows: the number of light source optical fibers at the transmitting end is 1, and the number of detection optical fibers at the receiving end is 6. The geometric distribution of the transmitting end light source optical fiber bundle and the receiving end detection optical fiber bundle on the section of the converging end of the Y-shaped probe optical fiber bundle is in a uniform and regular shape, and the receiving end detection optical fiber bundles are uniformly distributed around the transmitting end light source optical fiber bundle.
The probe-in type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the tip of the measuring probe is made of light absorption materials, and frosting and blackening are carried out to reduce the influence of space stray light on a detection signal of a receiving end.
The probe-in type receiving and transmitting integrated optical fiber dust concentration measuring device is characterized in that the distance from the inner reflector at the tip of the measuring probe to the converging end of the optical fiber bundle of the Y-shaped probe is 0-5 cm.
A detection method of a probing type receiving and transmitting integrated optical fiber dust concentration measuring device comprises the following steps:
step a, fixing a Y-shaped probe fiber bundle through a clamp, and installing the Y-shaped probe fiber bundle into protected structure testing equipment. The sensor probes should be reasonably arranged in a complex confined space.
And b, the main controller sends out an instruction, drives the laser through the laser driver, controls the laser to have constant light intensity, and enables the laser to be at constant working temperature through the temperature controller.
C, enabling the stabilized laser signal emitted by the laser to enter a probe measuring space through a transmitting end light source optical fiber bundle, irradiating the laser signal into a dust environment in the probe measuring space after being focused by a lens, reflecting the laser signal by a reflector, and irradiating the laser signal into the dust environment in the probe measuring space again to realize double-pass optical path transmission of the laser signal in the dust environment in the probe tip;
d, focusing a laser signal emitted from the dust to be detected in the probe measuring space through a lens, and then detecting an optical fiber bundle through a receiving end to transmit the laser signal to the avalanche type detector;
step e, converting the received laser signals into electric signals by the avalanche type detector, sending the electric signals to the signal processor, filtering and amplifying the electric signals by the signal processor, and collecting concentration signals at a certain collection frequency through a data collection card;
and f, the controller processes the output electric signal to establish the ratio of the output signal to the original signal, obtains the relation between the transmittance and the dust concentration according to the Lambert-beer law, and finally obtains the dust concentration to display on a display in real time.
The invention has the beneficial effects that:
(1) when the dust concentration detection device is used for detection, only the sensor measuring probe is required to be installed in a dust environment, other auxiliary equipment is not required to measure the dust concentration in the environment, the detection mode is explored, the dust concentration detection device can be flexibly used under various specific conditions, the influence on the dusty airflow flow field environment is avoided, the straight-through type measuring space can avoid dust accumulation in the probe in the high-concentration dust measuring process, the detection accuracy is improved, and the detection accuracy is improved;
(2) the invention adopts a structure form of transmitting and receiving integration, which is easy to integrate and miniaturize, has low cost and is convenient for detection in a narrow space, and the optical fiber probe of transmitting and receiving integration is of an all-optical fiber structure, thereby avoiding the interference of the external environment and improving the signal-to-noise ratio of a measurement system;
(3) the volume of the receiving and transmitting integrated optical fiber probe tip can be optimized according to the specific situation of a complex limited space. When the complex restricted space is too narrow, the design size of the tip of the measuring probe can be properly reduced, so that the measuring probe can be more reasonably arranged in the complex restricted space, and the change condition of the dust concentration of a measuring point can be accurately obtained;
(4) the manufacturing material of the receiving and transmitting integrated optical fiber probe optical fiber bundle can adopt high-temperature-resistant optical fibers, and is suitable for high-temperature complex detection conditions, so that the receiving and transmitting integrated optical fiber probe optical fiber bundle can be applied to a power cabin of a transportation means such as an airplane and the like, the reliability of a dry powder extinguishing system of the receiving and transmitting integrated optical fiber probe optical fiber bundle is verified, and the concentration of dry powder extinguishing agent particles in a complex protected space of the receiving and transmitting integrated optical fiber probe optical fiber bundle is.
Drawings
FIG. 1 is a schematic structural diagram of a probing type integrated fiber dust concentration measuring device;
FIG. 2 is a schematic view of the internal structure of the tip of the integrated fiber measurement probe;
FIG. 3 is a front view of the tip of a transceiver-integrated fiber optic measurement probe;
FIG. 4 is a side view of the tip of a transceiver-integrated fiber optic measurement probe;
FIG. 5 is a perspective view of the tip of the integrated fiber optic measurement probe;
FIG. 6 is a cross-sectional view of the distribution of the optical fiber bundle at the receiving end of the detector;
FIG. 7 is a cross-sectional view of the distribution of the fiber bundle at the emitting end of the laser light source;
FIG. 8 is a cross-sectional view of the converging end distribution of the probe fiber bundle;
FIG. 9 is a diagram of an example of a measuring device assembly installed in a representative complex confined space;
fig. 10 is a flow chart of a method implemented by a measuring device installed in a representative complex confined space.
The meaning of the reference symbols in the figures: 1-receiving and transmitting integrated optical fiber measuring probe part, 2-signal generating and processing control part, 3-representative complex limited space, 4-dusty airflow, 11-Y type probe optical fiber bundle, 111-receiving end detecting optical fiber bundle, 112-transmitting end light source optical fiber bundle, 113-lens, 114-receiving end optical fiber core, 115-transmitting end optical fiber core, 116-optical fiber protective layer, 12-measuring probe tip, 121-probe measuring space, 122-reflector, 123-reflector mounting end cover, 124-probe tip shell, 13-optical fiber coupler, 21-laser, 22-laser driver, 23-temperature controller, 24-main controller, 25-display, 26-avalanche type detector, 27-signal processor, 28-data acquisition means.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1 to 10, a probing type integrated fiber dust concentration measuring device includes an integrated fiber measuring probe 1 and a signal generating and processing control part 2, wherein the integrated fiber measuring probe 1 includes a Y-type probe fiber bundle 11, a receiving end detecting fiber bundle 111, a transmitting end light source fiber bundle 112, a lens 113, a measuring probe tip 12, a reflector 122, and a fiber coupler 13. The signal generation and processing control section 2 includes a laser 21, a laser driver 22, a temperature controller 23, a main controller 24, a display 25, an avalanche photodetector 26, a signal processor 27, and a data acquisition device 28.
The Y-shaped probe optical fiber bundle 11 is formed by converging a plurality of receiving end detection optical fiber bundles 111 and a plurality of transmitting end light source optical fiber bundles 112 through an optical fiber coupler, and the converging end of the Y-shaped probe optical fiber bundle 11 is connected with the tip 12 of the measuring probe in a nested manner. The measuring probe tip 12 is a hollow cylindrical structure with a wall hole formed in the circumferential direction, is made of a light absorption material, and is subjected to frosting and blackening treatment. The front end of the converging end of the Y-shaped probe fiber bundle 11 is sequentially provided with a lens 113 and a reflector 122. The hollow cylindrical structure in the measuring probe tip 12, in the area between the lens 113 and the mirror 122, is the probe measuring space 121. The straight-through type measuring space can avoid the influence of dust accumulation in a high-concentration dust environment on a measuring result.
The placing mode of the inner reflecting mirror 122 of the measuring probe tip 12 to the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 is limited along the central axis, and the collimation of the optical path is ensured. The distance between the reflector 122 and the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 is 0-5 cm. Namely, the focal length from the inner reflector 122 of the measuring probe tip 12 to the converging end lens 113 of the Y-shaped probe optical fiber bundle 11 should be between 0 and 5 cm.
In order to improve the dust concentration measurement precision, for the measurement of dust environments with different concentrations, the optimal determining method of the distance between the tip lens of the required measuring probe and the reflector comprises the following steps:
a. for different properties of the measured dust particles and different measured concentration ranges, the expression of the relationship between the intensity of the transmitted light and the original intensity is as follows according to Lambert-beer's law: i ═ I0e-cLK。I0The laser signal is an unattenuated laser signal, I is an attenuated laser signal, c is a dust concentration, L is a dust thickness through which incident light passes, and K is an absorption-divergence coefficient. And determining the absorption divergence coefficient K of the measured powder.
b. The transmissivity obtained by collecting the laser attenuation signal by the data collecting system is usually most suitable for data processing between 0.2 and 0.8, and the influence of noise signals such as stray light on the measurement result is small, so that the measurement result is more accurate. In the dust concentration measurement range of c2-c1g/m3Then, the following relationship is obtained: 0.2<
And 0.8>
By solving the above equation, the measurement range of the dust concentration is c2-c1g/m3The optical path L of the transmitted light is within a reasonable range
Measuring the distance between the probe tip lens and the reflector as the optical path L of the transmitted light
The output of the main controller 24 is connected to the laser driver 22 and the input of the temperature controller 23. The laser driver 22 and temperature controller 23 outputs are connected to the laser inputs. The output end of the laser 21 is connected with the transmitting end light source optical fiber bundle 112 through an optical fiber jumper, the receiving end detection optical fiber bundle is connected with the input end of the avalanche detector 26 through an optical fiber jumper, the output end of the avalanche detector 26 is connected with the input end of the data acquisition device 28 through the signal processor 27, and the data acquisition device 28 is interactively connected with the main controller 24. The input of the display 25 is connected to the output of the main controller 24.
As shown in fig. 10, a detection method of a probing type integrated fiber dust concentration measuring apparatus includes the following steps:
a. the measurement probe tip 12 is first secured by a jig and installed into the protected structure test equipment. The measurement probe tip 12 should be reasonably arranged in a complex confined space.
b. The main controller 24 gives an instruction to drive the laser 21 by the laser driver 22, to keep the laser 21 at a constant operating temperature by the temperature controller 23, and to perform constant light intensity control of the laser 21.
c. The stabilized laser signal emitted by the laser 21 enters the probe measuring space 121 through the transmitting end light source fiber bundle 112, is focused by the lens 113, and then irradiates the dust environment inside the probe measuring space 121 again through reflection of the reflecting mirror 122, so that the two-way optical path transmission of the laser signal in the dust environment inside the probe tip is realized;
d. laser signals emitted from dust to be detected in the probe measuring space 121 are focused by the lens 113 and then transmitted to the avalanche type detector 26 through the receiving end detection optical fiber bundle 111;
e. the avalanche type detector 26 converts the received laser signal into an electric signal and sends the electric signal to the signal processor 27, the signal processor 27 performs filtering and amplification processing, and concentration signal acquisition is performed at a certain acquisition frequency through the data acquisition device 28;
f. the main controller 24 processes the output electrical signal to obtain a ratio of the output signal to the original signal, establishes a relationship between the transmittance and the dust concentration according to the lambert-beer law, and finally obtains the dust concentration to display on the display 25 in real time.
The relationship between the transmittance and the dust concentration was obtained by the following calculation method. As shown in fig. 10, the measuring probe tip 12 installed in a typical complex confined space measures the dusty gas flow 4 by light, and calculates the ratio of the output signal to the original signal, i.e., the transmittance, based on the measurement data, and since the transmittance has a certain proportional relationship with the dust concentration in the dusty gas flow 4, the dust concentration in the dusty gas flow 4 can be calculated based on the certain proportional relationship. Initial light intensity of I0The monochromatic parallel light passes through a dust area with the medium thickness L, and if N scattering particles with the same size exist in a unit dust area, the light intensity I penetrating through the dust area is weakened under the scattering and absorption effects of the particles. According to lambert-beer's law, the reduced light intensity can be expressed as:
in the formula: n is a radical ofvNumber of particles per unit volume, KextThe extinction coefficient is related to the particle diameter d of the dust, the wavelength λ of incident light, and the refractive index m of the medium. L is the dust thickness through which the incident light passes. The particle number concentration is further deduced to be:
assuming that the measured particles are spherical particles, the density is ρ, and the diameter is d, the mass concentration is calculated as:
in practical application, the corresponding relation between the dust concentration and the transmissivity can be determined by a calibration test method, and the dust concentration can be conveniently obtained according to an experimental value in the measurement process.
The working principle of the invention is as follows: the main controller 24 is the core of the whole measuring device, and drives the laser 21 through the laser driver 22 and the temperature controller 23, and makes it at a constant working temperature for constant light intensity control. The stabilized laser signal emitted by the laser 21 passes through the light source fiber bundle 112 at the emitting end, is focused by the lens 113, and then irradiates the dust environment inside the probe measuring space 121, and the laser is reflected by the reflecting mirror 122 and irradiates the dust environment inside the probe measuring space 121 again, so that the two-way optical path transmission of the laser signal in the dust environment inside the measuring probe tip 12 is realized, and the measuring optical path is increased. Finally, the attenuated laser is focused by the lens 113 and transmitted to the avalanche type detector 26 through the receiving end detection optical fiber bundle 111. The avalanche detector 26 converts the received laser signal into an electrical signal, and sends the electrical signal to the signal processor 27 for filtering and amplification, the data acquisition device 28 acquires a concentration signal at a certain acquisition frequency, the main controller 24 processes the output electrical signal to obtain the ratio of the output signal to the original signal, and according to the lambert-beer law, the relationship between the transmittance and the dust concentration is established, and finally the obtained dust concentration is displayed on the display 25 in real time. Finally, the dust concentration measurement function of the receiving and transmitting integrated type is realized.
The above combinations may be flexibly adapted to some specific situations:
when the dust concentration of the dusty airflow 4 in the complex confined space is low, the main controller 24 can adjust the laser driver 22 to increase the current value passing through the laser 21 so as to increase the initial light intensity; when the dust concentration of the dusty gas flow 4 in the complex confined space is high, the main controller 24 can adjust the laser driver 22 to reduce the current value passing through the laser 21 to reduce the initial light intensity. And finally determining the initial light intensity value according to the specific measurement environment.
The volume of the measurement probe tip 12 can be optimized for the particular situation of a complex confined space. When the complex confined space is too narrow, the measurement probe tip 12 may be appropriately sized to be reduced for more reasonable placement in the complex confined space. When the environmental temperature in the complex confined space is too high, the measuring probe tip 12 and the Y-type probe fiber bundle 11 can be subjected to appropriate high temperature resistant protection treatment. And finally determining the reasonable design of the tip shape and the protective measures of the measuring probe according to the specific measuring environment.
The invention realizes the integrated transmitting and receiving measurement function of the transmitted light by adopting the Y-shaped probe optical fiber bundle 11, the measuring probe tip 12 and the optical fiber structure of the optical fiber jumper through the integrated transmitting and receiving optical fiber measuring probe 1. Through the collection of the transmitted light signal by the avalanche detector 26, the relation between the light transmittance and the dust concentration is established according to the Lambert-beer law, and the real-time measurement of the dust concentration in the complex limited space is realized. The dust concentration measurement device only needs to install the receiving and transmitting integrated optical fiber measurement probe 1 in a dust environment during dust concentration measurement, does not need to collect dust in the environment by other auxiliary equipment, has a simple structure, is easy to miniaturize and low in cost, avoids the influence of the wall surface of a measurement area on the size and the relative position of a scattering area by a probing type measurement mode, and can avoid dust accumulation in the probe in the high-concentration dust measurement process by a straight-through type measurement space, thereby improving the detection accuracy. The receiving and transmitting integrated structure is easy to integrate and miniaturize and has low cost, not only meets the working condition in a narrow space, but also effectively avoids the instability of circuit components in a complex special environment, ensures the accuracy of the measuring result and has stronger anti-jamming capability. The technical support is provided for anti-interference dust concentration measuring equipment in a complex limited space.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. The utility model provides a visit integrative optic fibre dust concentration measurement device of formula receiving and dispatching which characterized in that: the device comprises a receiving and transmitting integrated optical fiber measuring probe part (1) and a signal generating and processing control part (2), wherein the receiving and transmitting integrated optical fiber measuring probe part (1) comprises a Y-shaped probe optical fiber bundle (11), a receiving end detecting optical fiber bundle (111), a transmitting end light source optical fiber bundle (112), a lens (113), a measuring probe tip (12), a reflector (122) and an optical fiber coupler (13), and the signal generating and processing control part (2) comprises a laser (21), a laser driver (22), a temperature controller (23), a main controller (24), a display (25), an avalanche type detector (26), a signal processor (27) and a data acquisition device (28); wherein:
the Y-shaped probe optical fiber bundle (11) is formed by converging a plurality of transmitting end light source optical fiber bundles (112) and a plurality of receiving end detecting optical fiber bundles (111) through an optical fiber coupler (13), the converging end of the Y-shaped probe optical fiber bundle (11) is connected with a measuring probe tip (12) in a nested manner, the measuring probe tip (12) is of a hollow cylindrical structure with a plurality of wall holes arranged in the circumferential direction, is prepared by light absorption materials and is subjected to frosted blackening treatment, the front end of the converging end of the Y-shaped probe optical fiber bundle (11) is sequentially provided with a lens (113) and a reflector (122), the lens (113) and the reflector (122) are arranged in the middle area, and the hollow cylindrical structure in the measuring probe tip (12) is a probe measuring space (121);
the output end of the main controller (24) is connected with the input ends of the laser driver (22) and the temperature controller (23), the output ends of the laser driver (22) and the temperature controller (23) are connected with the input end of the laser, the output end of the laser (21) is connected with the transmitting end light source optical fiber bundle (112) through an optical fiber jumper, the receiving end detection optical fiber bundle is connected with the input end of the avalanche type detector (26) through the optical fiber jumper, the output end of the avalanche type detector (26) is connected with the input end of the data acquisition device (28) through the signal processor (27), the data acquisition device (28) is interactively connected with the main controller (24), and the input end of the display (25) is connected with the output end of the main controller (24).
2. The probing type optical fiber dust concentration measuring device of claim 1, wherein: the number of the transmitting end light source optical fiber bundles (112) is 1, the number of the receiving end detection optical fiber bundles (111) is 6-12, the geometric distribution of the transmitting end light source optical fiber bundles (112) and the receiving end detection optical fiber bundles (111) on the section of the converging end of the Y-shaped probe optical fiber bundle (11) is in a uniform and regular shape, and the receiving end detection optical fiber bundles (111) are uniformly distributed around the transmitting end light source optical fiber bundles (112).
3. The probing type optical fiber dust concentration measuring device of claim 1, wherein: the placing mode from the inner reflecting mirror (122) of the measuring probe tip (12) to the converging end lens (113) of the Y-shaped probe optical fiber bundle (11) is limited along the central axis direction, and the distance between the reflecting mirror (122) and the converging end lens (113) of the Y-shaped probe optical fiber bundle (11) is 0-5 cm.
4. The probing type optical fiber dust concentration measuring device of claim 1, wherein: the measuring probe tips (12) are made of light-absorbing material and are all frosted and blackened.
5. A measurement method of a probing type integrated optical fiber dust concentration measurement device according to claim 1, comprising the following steps:
step a, fixing a measuring probe tip (12) through a clamp, and installing the measuring probe tip (12) into protected structure testing equipment, wherein the measuring probe tip (12) is reasonably arranged in a complex limited space;
b, the main controller (24) sends out an instruction, the laser driver (22) drives the laser (21), the temperature controller (23) enables the laser (21) to be at a constant working temperature, and the laser (21) is subjected to constant light intensity control;
c, enabling the stabilized laser signal emitted by the laser (21) to enter a probe measuring space (121) through a transmitting end light source optical fiber bundle (112), irradiating the laser signal into a dust environment inside the probe measuring space (121) after being focused by a lens (113), reflecting the laser signal by a reflector (122), and irradiating the laser signal into the dust environment inside the probe measuring space (121) again to realize double-pass optical path transmission of the laser signal in the dust environment inside the measuring probe tip (12);
d, laser signals emitted from the dust to be detected in the probe measuring space (121) are focused by a lens (113) and then transmitted to an avalanche type detector (26) through a receiving end detection optical fiber bundle (111);
step e, converting the received laser signals into electric signals by the avalanche type detector (26), sending the electric signals to the signal processor (27), filtering and amplifying the electric signals by the signal processor (27), and acquiring concentration signals at a certain acquisition frequency by the data acquisition device (28);
and f, processing the output electric signal by the main controller (24) to obtain the ratio of the output signal to the original signal, establishing the relation between the transmittance and the dust concentration according to the Lambert-beer law, and finally displaying the obtained dust concentration on the display (25) in real time.
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| CN202011419949.7A CN112557269B (en) | 2020-12-07 | Detection type receiving and transmitting integrated optical fiber dust concentration measuring device and method |
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| CN202011419949.7A CN112557269B (en) | 2020-12-07 | Detection type receiving and transmitting integrated optical fiber dust concentration measuring device and method |
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| CN115096778B (en) * | 2022-07-05 | 2024-10-29 | 中国科学技术大学 | High-precision optical fiber aerosol concentration measuring probe, system and monitoring method |
| CN117233054A (en) * | 2023-11-13 | 2023-12-15 | 中国科学技术大学 | Method for correcting contamination interference of optical fiber probe, correction system and sensor |
| CN117233054B (en) * | 2023-11-13 | 2024-03-01 | 中国科学技术大学 | Method for correcting contamination interference of optical fiber probe, correction system and sensor |
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