JP2008039735A - Particle measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a particle measuring apparatus for quickly responding, and accurately measuring a concentration and a type of particles. <P>SOLUTION: The particle measuring apparatus is provided with: an inlet for sucking the particles in the air; piping for transporting the sucked particles; a sample cell for passing the particles through the piping; a light source for irradiating the particles passing through the sample cell with a light; a first optical sensor for detecting a scattered light scattered by the particles; a second optical sensor for detecting a fluorescence generated from the particles by the light; an analysis section for identifying the type of the particles based on an output signal from the second optical sensor; and a control section for increasing an intensity of the light emitted from the light source based on an output signal from the first optical sensor when the particles are detected, and instructing the second optical sensor to detect the fluorescence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a particle measuring apparatus that measures particles such as pollen scattered in the atmosphere or liquid.

In recent years, an increasing number of hay fever patients show allergic symptoms to pollen such as cedar and cypress. For these hay fever patients, it is very important to know the concentration of scattered pollen in real time for reference when opening and closing the window of the house, drying the laundry outdoors, or going out. It is beneficial.
The type of pollen that becomes an allergen, that is, the type of plant differs for each hay fever patient. Therefore, it is very useful to grasp the concentration scattered for each pollen species.

As a conventional real-time pollen measuring device, for example, in Patent Document 1, the pollen scattered in the atmosphere is sucked and guided to a pipe part, the pollen passing through the pipe is irradiated with laser light, the scattered light is detected, and the pollen is detected. An apparatus for calculating the concentration has been proposed. Moreover, in patent document 2, in addition to the amount of pollen, the kind of pollen is calculated by irradiating the pollen which passes through a piping path | route with the laser beam used as excitation light, and measuring the characteristic fluorescence amount which pollen emits. A configuration is disclosed.
Japanese Patent Laid-Open No. 10-318908 JP 2001-242065 A

However, when measurement is performed by continuously emitting laser light (CW) using the apparatus described in Patent Document 2, the fluorescence detection accuracy decreases due to insufficient irradiation power, and as a result, the pollen species identification accuracy decreases. there is a possibility.
In order to compensate for this shortage of irradiation power, a method of improving the fluorescence detection accuracy by reducing the passage speed of pollen by reducing the atmospheric suction speed (suction volume per unit time) can be considered. However, when the suction speed of the atmosphere is lowered, there is a problem that the response to the concentration change is lowered and the real-time property is impaired.
In view of the above-described conventional problems, an object of the present invention is to provide a particle measuring apparatus that can measure the concentration and type of particles with high responsiveness and high accuracy.

  The particle measuring apparatus according to the present invention includes an inlet for sucking particles in the atmosphere, a pipe part for transporting the sucked particles, a sample cell through which the particles pass through the pipe part, and the sample cell A light source for irradiating light to the particles passing through the inside, a first optical sensor for detecting scattered light scattered by the particles out of the light, and a second for detecting fluorescence emitted by the particles by the light. A light sensor; an analysis unit that identifies a type of the particle based on an output signal of the second light sensor; and light emission of the light source when the particle is detected based on an output signal of the first light sensor. A controller that increases the intensity and detects the fluorescence by the second optical sensor.

  ADVANTAGE OF THE INVENTION According to this invention, the particle | grain measuring apparatus which can measure the density | concentration and kind of particle | grains which exist in air | atmosphere etc. with high responsiveness with high precision is obtained.

Embodiments of the particle measuring apparatus of the present invention are shown below.
(Embodiment 1)
The configuration of the particle measuring apparatus according to the present embodiment will be described. FIG. 1 is a configuration diagram showing the entire particle measuring apparatus according to the present embodiment. The particle measuring apparatus includes a suction port 1 for sucking pollen 8 in the atmosphere, a cover 2 for preventing water and dust from falling into the suction port 1 and mixing with the pollen 8, and from the suction port 1 to the detection unit 6. Control for analyzing and analyzing the piping unit 3 for introducing the pollen 8, the pump 4 for sucking the air at a constant suction speed, the filter 5 for preventing particles larger than the pollen 8 from entering the piping unit 3, and the detection unit 6. An analysis unit 7 is provided.

Here, the structure of a detection part and a control analysis unit is shown in FIG. 3 and 4 are a front view and a longitudinal sectional view of the detection unit 6.
The detection unit 6 is scattered by the sample cell 61 through which the pollen 8 that has passed through the piping unit 3 passes, the semiconductor laser irradiation module 62 that irradiates the pollen 8 that passes through the sample cell 61 with laser light, and the pollen 8 out of the laser light. The scattered light receiving module 63 for detecting the scattered light and the fluorescent light receiving module 64 for detecting the fluorescence emitted by the pollen 8 by the laser light. The scattered light receiving module 63 and the fluorescence receiving module 64 are arranged on the yz plane including the semiconductor laser irradiation module 62. The semiconductor laser irradiation module 62 corresponds to the light source in the present invention, the scattered light receiving module 63 corresponds to the first optical sensor in the present invention, and the fluorescent light receiving module 64 corresponds to the second optical sensor in the present invention.

Pollen 8 that has passed through the piping 3 is injected from the injection port 65 and passes through the cavity 61 a in the sample cell 61. The hollow portion 61a has a rectangular shape with a cross section of a square having a side of 2.5 mm and a length (X direction (flow velocity direction)) of 10 mm. Pollen 8 that has passed through the hollow portion 61a moves from the discharge port 66 to the piping portion 3. Then, it is discharged to the outside via the pump 4.
The semiconductor laser irradiation module 62 includes a semiconductor laser and an optical system that emits light emitted from the semiconductor laser in the z direction.

The scattered light receiving module 63 includes a photodiode, a preamplifier, and an optical system that causes light scattered in the y direction in the region irradiated by the semiconductor laser irradiation module 62 in the sample cell 61 to enter the light receiving surface of the photodiode. Consists of. The signal intensity output from the scattered light receiving module 63 indicates the scattered light intensity.
The fluorescence light receiving module 64 is an optical system that causes the fluorescence generated in the region irradiated by the semiconductor laser irradiation module 62 in the sample cell 61 to propagate in the −y direction to the light receiving surface of the photodiode. And a spectroscopic element that causes a specific wavelength to enter the photodiode. The signal intensity output from the fluorescence light receiving module 64 indicates the fluorescence intensity.

  The control analysis unit 7 analyzes the output signal of the fluorescence light receiving module 64 to identify the type of pollen 8 and the semiconductor laser when the pollen 8 is detected based on the output signal of the scattered light receiving module 63. , The fluorescence is detected by the fluorescence receiving module 64, and after pollen 8 passes through the light receiving area of the fluorescence receiving module 64, the emission intensity of the semiconductor laser irradiation module 62 is returned to the intensity before the increase. Part. More specifically, the control unit includes a driver 71 that drives the semiconductor laser irradiation module 62, a trigger generator 72 that supplies the driver 71 with a trigger signal that increases the emission intensity of the semiconductor laser in pulses, and scattered light. The counter 73 counts the number of pulses of the output signal of the light receiving module 63. The fluorescence analyzer 74 corresponds to the analysis unit in the present invention.

Next, operation | movement of the particle | grain measuring apparatus of this Embodiment is demonstrated using FIGS.
Here, as an example, a case will be described in which the semiconductor laser irradiation module 62 irradiates a substantially parallel laser beam having a wavelength≈400 nm and a beam thickness in the x direction of 1 mm in the z direction. In addition, when light with a wavelength ≈ 400 nm is irradiated, a cedar pollen emits a fluorescence spectrum having a peak at a wavelength ≈ 500 nm, and a cypress pollen emits a fluorescence spectrum having a peak at a wavelength ≈ 521 nm. In this case, it is known to emit fluorescence spectrum fluorescence having a peak at a wavelength ≈ 505 nm.

Further, as a spectroscopic element, a bandpass filter made of a dielectric multilayer film having a transmittance peak of 500 nm and a transmittance full width at half maximum of 10 nm is used, and fluorescence of 500 ± 5 nm is incident on the light receiving surface of the silicon photodiode. The case where the fluorescence light receiving module 64 configured as described above is used to detect the peak of the fluorescence spectrum of cedar pollen will be described.
In the present embodiment, the pump 4 sucks air at a suction speed = 4.1 L / min. Accordingly, an air flow with a flow velocity of approximately 10.9 m / s is generated in the hollow portion 61a in the sample cell 61, and the pollen moves through the sample cell 61 at a velocity of approximately 10.9 m / s.

  In the graphs of FIGS. 5 to 7, the horizontal axis represents time (s). The vertical axis of the graph of FIG. 5 shows the output signal of the scattered light receiving module 63, which corresponds to the sum of the scattered light intensity scattered by pollen and the scattered light intensity scattered by other particles. The vertical axis of the graph in FIG. 6 indicates the power irradiated from the semiconductor laser irradiation module 62. The vertical axis of the graph of FIG. 7 shows the output signal of the fluorescence light receiving module 64, which corresponds to the fluorescence intensity emitted by pollen.

In the graph of FIG. 5, the scattered light receiving module 62 generates a pulse signal each time particles pass through the irradiation region of the semiconductor laser irradiation module 62. Here, the pulse width of this pulse signal is (1 mm) / (10.9 m / s) ≈91.4 μs. Further, the pulse amplitude depends on the size of the particle, and becomes larger as the particle becomes larger. The particle diameter of pollen is 20 μm or more, and most other suspended particles are 10 μm or less. Therefore, if the peak of the pulse amplitude is a predetermined value or more, it is determined as pollen. Here, the pulse amplitude for airborne particles other than pollen and the pulse amplitude for pollen are measured in advance. Then, in order to distinguish these, greater than the value of the pulse amplitude for airborne particles other than pollen, and sets the predetermined value y ₁ is smaller than the value of the pulse amplitude for pollen. If the predetermined value y ₁ is too small, floating particles other than pollen are misjudged as pollen, and if the predetermined value y ₁ is too large, pollen is misjudged as other floating particles. Set so that these misjudgments are minimized according to the environment used.

The number of pulses per unit time corresponds to the concentration of particles. For example, when the pollen concentration is 1000 / m ³ , the number of pulses per unit time = 1000 × (4.1 L / 1 m ³ ) = 4.1 pulses / min. ≈0.0683 pulses / s. The counter 73 counts the number of pulses per unit time and calculates the concentration. Here, counting only pulses exceeding the predetermined value y ₁ corresponds to the pollen concentration, and counting pulses equal to or less than the predetermined value y ₁ corresponds to other particle concentrations.

The trigger generator 72 supplies a trigger signal to the driver 71 when observing a pulse signal whose pulse amplitude exceeds a predetermined value y ₁ (at time t ₁ and t _{3 in} FIG. 5). Then, the driver 71 controls the semiconductor laser irradiation module 62 to increase the output power in a pulse shape as shown in the graph of FIG. That is, at time t ₁ and t ₃ in FIG. 6, the output power is increased from y ₂ to y ₃ (for example, from 5 mW to 100 mW). Then, after the particles pass through the irradiation region, the power is returned from y ₃ to y ₂ (for example, from 100 mW to 5 mW) at the time t ₂ and t ₄ after the elapse of a predetermined time τ from t ₁ and t ₃ . In the present embodiment, the period τ during which the power is increased (the period from t ₁ to t _{2 and} the period from t _{3 to} t ₄ in FIG. 6) is 91.4 μs. In other words, the output power is pulse-modulated with an amplitude of 95 mW (= 100-5 mW) and a width (τ) = 91.4 μs.

As described above, when the output power is controlled, as shown in the graph of FIG. 7, the fluorescence light receiving module 64 shows a pulsed output signal. Here, the pulse amplitude of the output signal (solid line) of the fluorescence light receiving module 64 for cedar pollen and the pulse amplitude (dotted line) for hinoki pollen are measured in advance, and the pulse amplitude that can be distinguished from these is set to a predetermined value y ₄ . . Then, when the trigger signal is supplied from the trigger generator 72, the fluorescence analyzer 74 analyzes the output signal of the fluorescence light receiving module and identifies the pollen species. That is, when the pulse amplitude exceeds the predetermined value y ₄ is identified as cedar pollen, if it does not exceed specified as Japanese cypress pollen.

  As described above, according to the present embodiment, it is possible to increase the power applied to the pollen by increasing the power of the laser light in a pulse shape only during the period when the pollen passes through the irradiation region of the laser light. it can. In the particle measuring apparatus according to the present embodiment, it is possible to irradiate 20 times the power, the fluorescence intensity also becomes 20 times, and the detection accuracy of the fluorescence is improved. As a result, the pollen species identification accuracy can be improved.

  The maximum standard of the output power of the semiconductor laser is set by distinguishing between continuous light emission (CW) and pulse light emission. Output power can be increased in pulsed light emission compared to continuous light emission (CW). Further, the output power can be increased as the pulse width and the duty are reduced. In view of this characteristic, the present invention effectively utilizes the light emission capability by pulse-modulating the power in accordance with the timing when pollen passes through the irradiation region.

Preferably, the maximum fluorescence intensity can be obtained by setting the power (pulse amplitude) at the time of pulse light emission to the allowable light emission power from the assumed duty and pulse width at the maximum pollen concentration. For example, when the amount of pollen scattering is very large and the pollen concentration is 1000 / m ³ , the average pulse interval is (1 m ³ /4.1 L) /1000≈0.244 min≈14.6 s. Since the pulse width is 91.4 μs, the duty is 91.4 μs / 14.6 s≈6.26 × 10 ⁻⁶ . Then, the power at the time of pulse emission is set from the duty and the pulse width.

In addition, since the lifetime of the semiconductor laser becomes longer as the average power of the output is lower, the pulsed output signal shown in the graph shown in FIG. 6 can be used to determine pollen with the required accuracy except during pulse emission. By setting the light emission power small, the life of the semiconductor laser can be extended, which is economical. Furthermore, by making the pulse width (τ) coincide with the passage period (period between t _{1 and} t ₂ ), it is advantageous that the average power can be set low while maintaining the accuracy of fluorescence detection at the maximum.

(Embodiment 2)
The configuration of the particle measuring apparatus according to the present embodiment will be described.
Except for using the detection unit 16 and the control analysis unit 17 instead of the detection unit 6 and the control analysis unit 7, it is the same as the particle measuring apparatus of the first embodiment shown in FIG.
Here, the structure of the detection part 16 and the control analysis unit 17 is shown in FIG. 9 and 10 are a front view and a longitudinal sectional view of the detection unit 16. The sample cell 61, the fluorescence light receiving module 64, the injection port 65, the discharge port 66, and the counter 73 in FIG. 8 are the sample cell 61, the fluorescence light reception module 64, the injection port 65, the discharge port 66, and the counter in FIG. 73. 8 is the same as the semiconductor laser irradiation module 62 and the trigger generator 72 of FIG. 2, but the settings and operations are different.

  The detection unit 16 includes a sample cell 61, a semiconductor laser irradiation module 62 that irradiates light in the z direction, and the sample cell 61 on the upstream side (position of 3 mm in the −x direction) from the irradiation region of the semiconductor laser irradiation module 62. On the yz plane including the semiconductor laser irradiation module 67 for generating scattered light, which irradiates the pollen 8 passing through the laser beam in the z direction, and the semiconductor laser irradiation module 62, the pollen 8 is disposed on both sides of the cavity 61a of the sample cell 61. A pair of fluorescent light receiving modules 64 and 69 for detecting fluorescence emitted in the -y and y directions, that is, a first fluorescent light receiving module 64 and a second fluorescent light receiving module 69 are provided. The semiconductor laser irradiation module 67 includes a semiconductor laser and an optical system that emits light emitted from the semiconductor laser as substantially parallel light. A substantially parallel laser beam having an output power ≈ 20 mW, a wavelength ≈ 780 nm, and a beam thickness in the x direction of 1 mm is irradiated in the z direction. The semiconductor laser irradiation module 67 and the semiconductor laser irradiation module 62 correspond to the first light source and the second light source in the present invention, respectively. The first fluorescent light receiving module 64 and the second fluorescent light receiving module 69 correspond to the second photosensor in the present invention.

  The scattered light receiving module 68 detects scattered light scattered by the pollen 8. The scattered light receiving module 68 is an optical system that causes light scattered in the y direction in the region irradiated by the semiconductor laser irradiation module 67 in the sample cell 61 to be incident on the light receiving surface of the photodiode. It consists of. The signal intensity output from the scattered light receiving module 68 indicates the scattered light intensity. The scattered light receiving module 68 corresponds to the first optical sensor in the present invention.

Similar to the first embodiment, the semiconductor laser irradiation module 62 irradiates substantially z-axis laser light having a wavelength of approximately 400 nm and a beam thickness in the x direction of 1 mm in the z direction.
The second fluorescent light receiving module 69 detects only the fluorescence emitted from the pollen 8. The second fluorescent light receiving module 69 causes the fluorescent light generated in the region irradiated by the semiconductor laser irradiation module 62 in the sample cell 61 to propagate in the y direction to be incident on the light receiving surface of the photodiode. It consists of an optical system and a spectroscopic element that makes a specific wavelength incident on a photodiode. The signal intensity output from the second fluorescence light receiving module 69 indicates the fluorescence intensity. The fluorescence analyzer 76 corresponds to the analysis unit in the present invention.

Next, operation | movement of the particle | grain measuring apparatus of this Embodiment is demonstrated using FIGS.
Here, a bandpass filter made of a dielectric multilayer film having a transmittance peak of 521 nm and a transmittance full width at half maximum of 10 nm is used as the spectroscopic element, and fluorescence of 521 ± 5 nm is incident on the light receiving surface of the silicon photodiode. A case where the peak of the fluorescence spectrum of cypress pollen is detected using the second fluorescence light receiving module 69 configured as described above will be described.

As in the first embodiment, the pump 4 sucks air at a suction speed = 4.1 L / min. Accordingly, an air flow with a flow velocity of approximately 10.9 m / s is generated in the hollow portion 61a in the sample cell 61, and the pollen moves through the sample cell 61 at a velocity of approximately 10.9 m / s.
In the graphs of FIGS. 11 to 14, the horizontal axis represents time (s). The vertical axis of the graph in FIG. 11 indicates the power irradiated from the semiconductor laser irradiation module 67, and is the power that generates scattered light. The vertical axis of the graph of FIG. 12 shows the output signal of the scattered light receiving module 68, which corresponds not only to the scattered light intensity scattered by pollen but also to the scattered light intensity scattered by other particles. The vertical axis of the graph of FIG. 13 indicates the power irradiated from the semiconductor laser irradiation module 62 and indicates the power for exciting the fluorescence. The vertical axis of the graph of FIG. 14 shows the output signals of the fluorescence light receiving modules 64 and 69, which corresponds to the fluorescence intensity emitted by the pollen.

As shown in the graph of FIG. 12, the scattered light receiving module 68 generates a pulse signal each time particles pass through the irradiation region of the semiconductor laser irradiation module 67. Here, the pulse width of this pulse signal is (1 mm) / (10.9 m / s) ≈91.4 μs. Further, the pulse amplitude depends on the size of the particle, and becomes larger as the particle becomes larger. The particle diameter of pollen is 20 μm or more, and most other suspended particles are 10 μm or less. Therefore, if the peak of the pulse amplitude is a predetermined value or more, it is determined as pollen. Here, the pulse amplitude for airborne particles other than pollen and the pulse amplitude for pollen are measured in advance. Then, in order to distinguish them, larger than the pulse amplitude values for airborne particles other than pollen, and sets the predetermined value y ₅ less than the value of the pulse amplitude for pollen. Note that this will be a predetermined value y ₅ to too small suspended particles other than pollen erroneously determined pollen, because when too large a predetermined value y ₅ pollen erroneously determined other suspended particles, Set so that these misjudgments are minimized according to the environment used.

The number of pulses per unit time corresponds to the concentration of particles. For example, when the pollen concentration is 1000 / m ³ , the number of pulses per unit time = 1000 × (4.1 L / 1 m ³ ) = 4.1 pulses / min. ≈0.0683 pulses / s. The counter 73 counts the number of pulses per unit time and calculates the concentration. Here, counting only pulses exceeding the predetermined value y ₅ corresponds to the concentration of pollen, and counting pulses equal to or less than the predetermined value y ₅ corresponds to the concentration including other particles.

The trigger generator 72 supplies the trigger signal to the driver 75 after a lapse of a predetermined time t from the time point (t ₉ and t _{11 in} FIG. 12) when the pulse signal whose pulse amplitude exceeds the predetermined value y ₅ is observed. In the present embodiment, since fluorescence is observed 3 mm downstream from the region where scattered light is observed, the trigger is set so that the predetermined time t = (3 mm) / (10.9 m / s) ≈275 μs. Set the generator 72. The driver 75 controls the semiconductor laser irradiation module 62. As shown in the graph of FIG. 13, the output power is changed from 0 mW to a predetermined value y at t ₅ and t ₇ after 275 μs has elapsed from the time t ₉ and t _{11. 6} (for example, 200 mW) and pulse light emission. Then, after the particles pass through the irradiation region, that is, after passing through the light receiving region of the fluorescent light emitting modules 64 and 69, the output power is restored from a predetermined value y ₆ (for example, 200 mW) to 0 mW. In the case of the present embodiment, the period during which the output power is increased (the period from t ₅ to t _{6 and} the period from t _{7 to} t ₈ in FIG. 13) is 91.4 μs. In other words, the output power is pulse-modulated with an amplitude of 200 mW width = 91.4 μs.

  As described above, when the output power is controlled, as shown in the graph of FIG. 14, the fluorescence light receiving module shows a pulsed output signal. In FIG. 14, the solid line indicates the output signal of the first fluorescent light receiving module 64, and the dotted line indicates the output signal of the second fluorescent light receiving module 69. Here, the first fluorescent light receiving module 64 is set to detect the peak of the fluorescence spectrum of the cedar pollen, and the second fluorescent light receiving module 69 is set to detect the peak of the fluorescence spectrum of the cypress pollen. ing.

  For this reason, in the case of cedar pollen, the output signal of the first fluorescent light receiving module 64 is larger than the output signal of the second fluorescent light receiving module 69. In the case of cypress pollen, the output signal of the second fluorescent light receiving module 69 is larger than the output signal of the first fluorescent light receiving module 64. Therefore, the fluorescence analyzer 76 identifies cedar pollen when the solid line (the output signal of the first fluorescent light receiving module 64) is larger than the dotted line (the output signal of the second fluorescent light receiving module 69). In the case of cypress pollen.

Further, the semiconductor laser irradiation module 67 emits light during a period in which fluorescence is detected, that is, a period in which the semiconductor laser irradiation module 62 emits pulses (periods t ₅ to t ₆ and t _{7 to} t ₈ shown in FIG. 13). To stop. Thereby, the stray light in fluorescence detection can be reduced.
As described above, according to the present embodiment, it is possible to increase the power applied to the pollen by increasing the power of the laser light in a pulse shape only during the period when the pollen passes through the irradiation region of the laser light. it can.

  In particular, in the fluorescence analysis, the pollen species is identified based on the spectral characteristics, that is, the output signals of the two types of fluorescence light receiving modules 64 and 69 having different fluorescence wavelengths to be detected, so that the identification accuracy is improved. That is, compared with Embodiment 1, since the influence by the difference in irradiation intensity | strength and the fluorescence capture rate by the difference in the pollen position in the yz surface in an excitation light irradiation area | region can be removed, specific accuracy improves. For example, a large number of pollen species can be identified by calculating a ratio of signals of two types of fluorescent light receiving modules and measuring and registering the ratio for each pollen species in advance.

  In general, a semiconductor laser dedicated to pulsed light emission can emit light at a higher power than a semiconductor laser capable of CW light emission. Accordingly, when the semiconductor laser irradiation module 62 is dedicated to fluorescence excitation as in the present embodiment, a semiconductor laser dedicated to pulse emission can be used, and high power can be irradiated, which is advantageous in improving accuracy. It is.

Although the above embodiment shows a case where the type of pollen is specified, if the particle emits specific fluorescence other than pollen, the type of particle is specified by detecting the specific fluorescence spectrum of the particle. Can do.
Moreover, although the said embodiment shows the case where the kind of pollen which floats in air | atmosphere is specified, the other particle | grains which float in air | atmosphere may be sufficient. Examples of such particles include soil pride, house dust, particles discharged from diesel vehicles, and the like. The same effect as described above can also be exhibited when specifying particles floating in the solution, such as polystyrene particles and antigen-antibody complexes.

  The particle measuring apparatus according to the present invention is useful for hay fever countermeasures and the like because the concentration and type of particles such as pollen scattered in the atmosphere can be specified with high accuracy and high responsiveness.

It is a block diagram of the particle | grain measuring apparatus of Embodiment 1 of this invention. It is a block diagram of the detection part 6 and the control analysis unit 7 in the particle | grain measuring apparatus of Embodiment 1 of this invention. It is a front view of the detection part 6 of FIG. It is a longitudinal cross-sectional view of the detection part 6 of FIG. It is a figure which shows the time-dependent change of the output signal of the scattered light light reception module 63. FIG. It is a figure which shows the time-dependent change of the output power of the semiconductor laser irradiation module 62. FIG. It is a figure which shows the time-dependent change of the output signal of the fluorescence light reception module 64. FIG. It is a block diagram of the detection part 16 and the control analysis unit 17 in the particle | grain measuring apparatus of Embodiment 2 of this invention. It is a front view of the detection part 16 of FIG. It is a longitudinal cross-sectional view of the detection part 16 of FIG. It is a figure which shows the time-dependent change of the output power of the semiconductor laser irradiation module 67 for scattered light generation. It is a figure which shows the time-dependent change of the output signal of the scattered light light reception module 68. FIG. It is a figure which shows the time-dependent change of the output power of the semiconductor laser irradiation module 62 for fluorescence excitation. It is a figure which shows the time-dependent change of the output signal of the fluorescence light-receiving modules 64 and 69.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suction port 2 Cover 3 Piping part 4 Pump 5 Filter 6, 16 Detection part 7, 17 Control analysis unit 8 Pollen 61 Sample cell 61a Cavity part 62, 67 Semiconductor laser irradiation module 63, 68 Scattered light receiving module 64, 69 Fluorescence receiving Module 71, 75 Driver 72 Trigger generator 73 Counter 74, 76 Fluorescence analyzer

Claims (9)

A suction port for sucking particles in the atmosphere;
A piping section for transporting the sucked particles;
A sample cell through which the particles pass through the piping section;
A light source for irradiating light to the particles passing through the sample cell;
A first optical sensor for detecting scattered light scattered by the particles of the light;
A second optical sensor for detecting fluorescence emitted by the particles by the light;
An analysis unit for identifying the type of the particle based on an output signal of the second photosensor;
A controller that increases the emission intensity of the light source at the time when the particles are detected based on the output signal of the first photosensor, and detects the fluorescence by the second photosensor;
Particle measuring device equipped with.   2. The particle measuring apparatus according to claim 1, wherein the control unit returns the intensity before the light emission intensity of the light source is increased after the particles have passed through a light receiving region of the second photosensor in the sample cell. The light source includes: a first light source that irradiates light to the particles that pass upstream in the sample cell; a second light source that irradiates light to the particles that pass downstream in the sample cell; Including
The first sensor detects scattered light scattered by the particles out of light from the first light source,
The second sensor detects fluorescence emitted by the particles by light from the second light source,
The control unit increases the emission intensity of the second light source at the time when the particles are detected based on the output signal of the first photosensor, and causes the second photosensor to detect the fluorescence. Item 1. The particle measuring apparatus according to Item 1.   4. The particle measurement according to claim 3, wherein the control unit returns the intensity of the second light source to an intensity before increasing after the particles have passed through a light receiving region of the second photosensor in the sample cell. apparatus.   The particle measuring apparatus according to claim 3, wherein the control unit causes the second light source to emit light based on an output signal of the first photosensor.   6. The particle measuring apparatus according to claim 4, wherein the controller reduces the light emission intensity of the first light source while the second light source emits light.   7. The particle measuring apparatus according to claim 3, wherein the control unit matches a light emission time of the second light source with a time during which the particles pass through a light receiving region of the second photosensor.   The particle analyzer according to any one of claims 1 to 7, wherein the analysis unit specifies a pollen species based on an output signal of the second photosensor. The second photosensor includes two or more detection units having different fluorescence wavelengths to be detected,
The particle analyzer according to any one of claims 1 to 7, wherein the analysis unit specifies a pollen species based on output signals of the two or more detection units.

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