JP4115646B2 - Light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a light simulating the change in light intensity of sunlight that can improve the efficiency, quality, operability, etc. in research, development, and production that require light such as photosynthesis reaction and photochemical reaction. Or a light source device capable of stably supplying light of an arbitrary intensity. In particular, the present invention relates to a light source device capable of simulating good sunlight for use in research of photosynthesis organisms and device development using sunlight.
[0002]
[Prior art]
In the study of photosynthesis and the development of photosynthesis culture devices, various studies are conducted by experiments using sunlight or artificial light. For example, there are studies on effects on culture characteristics such as culture solution temperature, CO ₂ concentration, medium component, culture solution pH, cell concentration, irradiation area, reactor structure, control method, and the like. At that time, it was relatively easy to use a constant light intensity with a light source device using artificial light, but depending on the type of light source device, the light intensity might attenuate with long-term use. . Moreover, since sunlight is natural light, it was difficult to reproduce the same irradiation conditions.
[0003]
In the conventional method, incandescent bulbs and fluorescent lamps are used as light sources that are easily used, and they are placed on the outer surface of a transparent tank of a culture reactor, or placed in a reactor tank in a transparent protective tube. It is used. However, in all cases, the light intensity was relatively weak, and it was difficult to adjust the light intensity with a fluorescent lamp, and the operability was poor.
[0004]
As other light source devices, discharge lamps such as a xenon lamp, a sodium lamp, a metal halide lamp, and a mercury lamp are known. In particular, xenon lamps are often used because the wavelength characteristic of visible light is close to that of sunlight, and the responsiveness is good and a strong light intensity can be obtained.
[0005]
These discharge lamps have an advantage that the light intensity can be changed according to the amount of current, but in order to be lit, it is necessary to energize more than a certain current value, and it is difficult to use weak light. Further, there are problems that the arc becomes unstable near the lighting current value, the light intensity varies, and the light is turned off. Although it is known to use a neutral density filter to reduce the light intensity, there is a problem that the light intensity decreases as a whole.
[0006]
In addition, the discharge lamp may be worn with the generation of an arc in the discharge lamp, and even when the current value is controlled to be constant, the luminous flux gradually decreases, and in the worst case, it may not be lit. Generally, it is said that it is necessary to replace the light beam when the light intensity is reduced by 20 to 30% from the initial light intensity or when it is not lit.
[0007]
For this reason, even if constant current control is performed, the supplied light intensity gradually decreases, causing experimental errors, and in order to avoid this, it is necessary to frequently measure the light intensity and change the set current value. And operability was bad.
[0008]
Therefore, it is considered that the light intensity may be measured and controlled so that this value becomes constant. However, since the discharge lamp has a high light intensity, it exceeds the measurement range of the optical sensor, or if it is directly measured by the optical sensor, an error due to the sensor history occurs, so that accurate measurement is difficult. Although it is possible to measure the light intensity of the discharge lamp with a pin fall, in that case the measurement accuracy is poor and the light intensity in the synthetic culture apparatus is several μE · m ⁻² · s ^−. It was difficult to control with an accuracy of ¹ .
[0009]
In the case of a discharge lamp, if lighting and extinguishing are repeated, the life of the discharge lamp may be significantly reduced due to arc shock during lighting. On the other hand, sunlight is frequently blocked by clouds from several times to several hundred times or more per day except for a perfect sunny day. For this reason, when trying to simulate sunlight with a conventional discharge lamp, the discharge lamp may be consumed in large quantities.
[0010]
JP-A-7-289237 proposes a culture vessel for photosynthetic microorganisms using a cold cathode fluorescent lamp tube with an inverter and capable of dimming the light intensity independently. However, this publication does not describe a specific description of the light intensity related to light control. Japanese Patent Application Laid-Open No. 9-306201 proposes a pseudo-sunlight irradiation device that removes a spectral component in a desired wavelength region from the emission spectrum of a xenon short arc lamp. However, the purpose of the pseudo-sunlight irradiation apparatus of the publication is related to the reproduction of the spectrum distribution of natural sunlight, and no specific description of the light intensity related to light control is described.
[0011]
[Problems to be solved by the invention]
Therefore, the present invention can improve the efficiency, quality, operability, etc. in research, development, and production that require light such as photosynthesis reaction and photochemical reaction, that is, change the light intensity of sunlight. Provided is a light source device capable of stably supplying simulated light or light of an arbitrary intensity. In particular, an object of the present invention is to provide a light source device that can simulate sunlight well for use in research of photosynthesis organisms and device development using sunlight.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the light source device of the present invention includes:
(1) A light source unit having a discharge lamp in which the intensity of light applied continuously changes depending on the amount of current supplied ;
(2) a power supply unit for supplying power to the discharge lamp of the light source unit;
(3) A dimming unit having a neutral density filter for stepwise dimming the light emitted from the light source unit;
(4) An irradiating unit having a light dispersion carrier for irradiating light modulated by the light modulating unit by light scattering,
(5) a light sensor fixed so that the light scattering portion of the upper end light receiving portion of the light dispersion carrier and the light sensitive portion of the light sensor coincide with each other; and
(6) By changing the current value to the discharge lamp and the dimming rate of the neutral density filter so as to be a preset value of the light intensity of the light dispersion carrier by the measurement value of the photosensor , Measurement / control unit for controlling the light intensity of the light-dispersed carrier irradiation surface,
It is characterized by having.
[0013]
According to the light source device of the present invention, the light intensity irradiated from the light sensor arranged in the light scattering portion of the light dispersion carrier in the light irradiation portion is actually measured, and using this value, the filter and the artificial light source having different attenuation rates are measured. By controlling the current value, the light intensity can be controlled over a wide range from low light intensity to high light intensity including zero light intensity.
[0014]
The sun can be used as the light source instead of the artificial light source. In this case, the power supply unit is not particularly necessary, and preset light can be stably supplied.
[0015]
The light source device of the present invention is used for general purposes when simulated light of sunlight is required, or when arbitrary light is stably required, such as research, development, and production where light such as photochemical reaction is indispensable In particular, it can be used as a light source device that can simulate sunlight well for use in research of photosynthetic organisms and device development of photosynthesis reaction by sunlight.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram of a light source device showing an embodiment of the present invention. The light source device of the present invention comprises a light source unit 1, a power source unit 2, a light control unit 3, a light transmission unit 4, a cooling unit 5, an irradiation unit 6, a measurement / control unit 7, and a photoreactor unit 8. .
[0017]
The light source unit 1 includes a discharge lamp 12, a condensing reflecting mirror 13 that collects and reflects light from the discharge lamp 12, and a main configuration of a lamp house 11 that houses the discharging lamp 12 and the condensing reflecting mirror 13. It consists of parts. The discharge lamp 12 is connected to the power supply device 10 of the power supply unit 2. Examples of the discharge lamp 12 include a xenon lamp, a sodium lamp, a metal halide lamp, and a mercury lamp.
[0018]
The dimming unit 3 is for dimming the light from the light source unit 1, and is composed of a dimming filter 31 and a dimming filter 32, which are a heat insulating filter and a wavelength adjusting filter.
[0019]
The neutral density filter 32 may be configured to be exchangeable with a plurality of filters having different attenuation ratios. Preferably, the filter is composed of a total of three or more filters, one with a light attenuation rate of 0%, one with 100%, and one or more with a value between 0 and 100%. The However, the neutral density filter 32 having a dimming rate of 0% may be a blank dummy filter with nothing. Further, the neutral density filter 32 having a dimming rate of 100% may be a light shielding plate that does not transmit light. As the neutral density filter 32, a neutral density filter 32 made of glass or a small aperture formed in a metal plate can be used. The neutral density filters 32 having different dimming rates are arranged in a circular shape, a row shape, and a stacked shape, and the desired neutral density filter 32 is passed through the optical path by an existing driving device such as a servo motor, an actuator, or an electromagnet. It is preferable to move to.
[0020]
The light transmission unit 4 includes a light transmission main body 42 such as an optical fiber or an optical duct having a light transmission incident part 41 and a light transmission emission part 43 at both ends. In addition, the cooling unit 5 has a structure in which cooling air is blown to the light source unit 1, the light control unit 3, and the light transmission incident unit 41 to remove heat. The light transmission emitting part 43 is connected to the upper end light receiving part of the light dispersion carrier 61 constituting the irradiating part 6 by a connecting jig 73. The connection jig 73 is provided with an optical sensor mounting hole, and the optical sensor 71 is mounted.
[0021]
FIG. 2 is an internal view of the inside of a connection jig 73 for connecting the light transmission emitting portion 43 and the light dispersion carrier 61. As shown in FIG. 2, the light-sensitive portion 72 of the optical sensor 71 is adjusted and fixed so as to exactly coincide with the upper light-scattering slit portion 62 among the light-scattering slits provided on the entire light dispersion carrier 61. ing. In FIG. 2, the light scattering slit portion 62 is shown as a band-shaped slit, but it may be a circular slit combined with the light-sensitive portion 72 of the optical sensor 71.
[0022]
In addition, the optical transmission main body 42 may be branched in the middle, and there may be a plurality of the optical transmission emitting units 43 and the irradiation units 6. An optical sensor 71 may be provided.
[0023]
The optical sensor 71 and the measurement / control unit 7 are connected so that the light intensity measured by the optical sensor 71 becomes input information to the measurement / control unit 7 that controls the average light intensity of the irradiation surface of the light dispersion carrier 61. Has been.
[0024]
On the other hand, in the measurement / control unit 7, a sunlight tracking direct light sensor 74 is installed outdoors, and the light intensity measurement signal obtained by the sunlight tracking direct light sensor 74 is transmitted from a keyboard, The signal is input to the control computer 76 together with a signal from the input device 75 based on various media. Further, the output signal of the control computer 76 is a filter of a discharge lamp current control circuit (not shown) for controlling the power supply device 10 of the power supply unit 2, and a neutral density filter 32 for controlling the dimming unit 3. It is connected to a drive control circuit (not shown).
[0025]
The sunlight tracking direct light optical sensor 74 is not necessarily installed at the same place as the light source device. Data regarding light intensity may be transmitted from a remote place via a communication circuit, or once stored in a recording medium may be used via the input device 75. Note that the input device 75 can also handle arbitrary values and light measurement data of the past and each place.
[0026]
Examples of the light sensor 71 and the sunlight tracking direct light sensor 74 include an optical quantum meter, a radiometer, and an illuminometer. Moreover, not only direct light but sunlight may measure total sky light according to the necessity of experiment, and you may use this.
[0027]
The light dispersion carrier 61 of the irradiation unit 6 is attached to the photoreactor unit 8. For example, the photoreactor unit 8 is a photosynthetic culture tank or a photochemical reaction device, but this is not limited in the present invention, and any device or tester that requires light may be used. In the light source device of FIG. 1, the shape of the light dispersion carrier 61 and the connection jig 73 is expressed as a flat shape, but may be a columnar shape, a cylindrical shape, a tapered plate shape, or the like.
[0028]
Next, the operation of the light source device of FIG. 1 will be described in detail. In FIG. 1, when the set current is supplied from the power supply unit 2, the discharge lamp 12 is turned on, and the generated artificial light is condensed on the end surface of the light transmission incident unit 41 by the condensing reflecting mirror 13. The At this time, the infrared component is cut from the wavelength of the artificial light or the spectrum is adjusted so as to have a wavelength spectrum in the visible light range by the action of the heat insulating filter or the wavelength adjusting filter as the dimming filter 31 provided in the optical path. The
[0029]
Further, the light intensity is adjusted stepwise between 0% and 100% according to the attenuation rate of the selected filter by the action of the neutral density filter 32 provided in the optical path. Here, the setting control of the current amount of the discharge lamp 12 and the drive control of the neutral density filter 32 are performed by a method described later.
[0030]
In addition, since the light transmission incident part 41 of the light source part 1, the light control part 3, and the light transmission part 4 each generate | occur | produces the heat rise accompanying lighting of the discharge lamp 12, and strong temperature permeation | transmission and irradiation generate | occur | produce, It is necessary to remove heat by blowing air from the cooling unit 5.
[0031]
By using an optical transmission function such as an optical fiber or an optical duct, it is possible to transmit the light incident on the optical transmission incident unit 41 to the optical transmission emitting unit 43. In addition, it is possible to directly focus the discharge lamp 12 on the upper incident surface of the light dispersion carrier 61 without using the light transmission unit 4, and the light transmission efficiency is high. However, it is preferable to use an optical fiber for operability and safety.
[0032]
As the light dispersion carrier 61, for example, a light dispersion carrier such as a light-emitting carrier having a light incident end face as shown in JP-A-8-262232 and an irradiation surface of a patterned light scattering portion is used. Can do.
[0033]
The connecting jig 73 has a function of optically and mechanically connecting the light transmission emitting portion 43 and the light dispersion carrier 61, and a light scattering slit portion in which the light sensing portion 72 of the light sensor 71 is provided in the light dispersion carrier 61. It has the function to make it correspond to 62 firmly and to be able to always measure the light in this part stably. Further, the light of the light dispersion carrier 61 is prevented from leaking to the outside, and conversely, the light is prevented from entering the light dispersion carrier 61 from the outside, and the measurement value of the light sensor 71 is not given an error.
[0034]
The light emitted from the light transmission emitting unit 43 is irradiated from the light dispersion carrier 61 into the photoreactor unit 8. At this time, the optical sensor 71 can measure the light scattered light of the light dispersion slit portion 62. The relationship between the measured light intensity using the optical sensor 71 and the average light intensity of the light dispersion carrier 61 (or if the light transmission main body portion 42 is branched and there are a plurality of light transmission emitting portions 43, all the connected light sources are connected). The relationship between the average light intensity of the light dispersion carrier 61 and the inside and outside of the photoreactor unit 8 is obtained in advance so that the control computer 76 receives the signal of the light sensor 71 and receives the average of the light dispersion carrier 61. It becomes possible to perform setting control of the current amount of the discharge lamp 12 and drive control of the neutral density filter 32 so that the light intensity becomes a desired set value.
[0035]
【Example】
[Example 1] Example of control using current value and neutral density filter In Example 1, the light source device of the present invention shown in Fig. 1 is used, and a 2.5 kW xenon discharge lamp is used as the discharge lamp. The transmission part used a multicomponent optical fiber fiber (single fiber diameter: 50 μm) with a bundling diameter of 25 mmφ × length 5000 mm, and the irradiation part used a glass light dispersion carrier of length 1200 mm × width 100 mm × thickness 30 mm. By changing the discharge lamp current amount and the neutral density filter, the result of controlling the light intensity to an arbitrary value is shown. The horizontal axis indicates the current amount (A), and the vertical axis indicates the light intensity (μE · m ⁻² · s ⁻ FIG. 3 shows a graph obtained by taking ¹ ).
[0036]
The mark ● in FIG. 3 indicates the average light intensity of the light dispersion carrier when using a filter with a light attenuation rate of 0%. The light intensity is 200 μE · m ⁻² · s within a stable lighting current range from 94 A to 50 A. ⁻¹ to 70 μE · m ⁻² · s ⁻¹ . In the same manner, a filter with a light attenuation rate of 50% is indicated by a circle, a filter with a light attenuation rate of 80% is indicated by a triangle, and a filter with a light attenuation rate of 100% is indicated by a square. as described above, including the overlapping light intensity, up to the weak light intensity from 200μE · m ^-2 · s ^-1 to about 13μE · m ^-2 · s ^-1, to be set in a stable lighting state It was possible.
[0037]
Furthermore, it was possible to make the light intensity zero even with the discharge lamp turned on by the filter having a light attenuation rate of 100%. Note that the current amount when the light attenuation rate is 100% can be set from 50 A to 94 A. However, a smaller current amount is preferable in terms of heat removal and power reduction.
[0038]
In Example 1, since the attenuation rate of the neutral density filter was 80%, about 13 μE · m ⁻² · s ⁻¹ was the minimum value of the light intensity current setting. Can be easily handled by replacing or adding a neutral density filter with a further increased attenuation factor.
[0039]
Note that if the light intensity of the optical sensor is apparently weak due to an unexpected failure such as damage to the optical fiber, there is a possibility of abnormal control that attempts to increase the light intensity of the light source. For this reason, it is advisable to take safety measures such as detecting an abnormal state from the relationship between the set value and the light intensity of the optical sensor and the attenuation rate of the discharge lamp light amount in normal use.
[0040]
According to the light source device of the first embodiment, it is possible to stably use weak light that cannot be obtained by a conventional discharge lamp. Moreover, even if it is not turned off, it is possible to make it the same state as turned off, and an effect of preventing the shortening of the discharge lamp life due to arc shock at the time of lighting was obtained. In addition, in the conventional light source device, a strong current is temporarily required for arc formation at the time of lighting, so that the strong light intensity may continue for a while, and it is in a state where light control is not possible, of course, such as photosynthetic culture Although the influence on the experiment may be a problem, the light source device of Example 1 did not have such a problem.
[0041]
[Example 2, Comparative Example 1]
FIG. 4 shows the comparison between the second embodiment using the light source device of the present invention and the first comparison example using the light source device having the same configuration as that of the second embodiment, except that a light sensor, a control computer, and a neutral density filter are not present. , Comparing the time course of light intensity at the center point of the light dispersion carrier, with the horizontal axis representing the lighting time (hours) and the vertical axis representing the light intensity (μE · m ⁻² · s ⁻¹ ) Show.
[0042]
Here, the present Example 2 and Comparative Example 1 use 2.5 kW xenon discharge lamps having the same specifications, and the optical transmission part has a bundling diameter of 25 mmφ × length of 2000 mm for a multicomponent optical fiber (single fiber diameter: 50 μm). In the irradiation part, an acrylic light dispersion carrier of 900 mm long × 100 mm wide × 30 mm thick was used. In Example 2, a filter with a light attenuation rate of 0% is used, and Comparative Example 1 is a light source device without a light attenuation filter. In Comparative Example 1, the current value of the power supply device was controlled to be constant. On the other hand, in Example 2, the initial setting input is performed from the keyboard so that the light intensity is the same as that of Comparative Example 1, and then the current is measured so that the light intensity measured by the optical sensor installed on the light dispersion carrier is constant. The value was automatically controlled. The relationship between the lighting time of the xenon discharge lamps of Example 2 and Comparative Example 1 thus obtained and the light intensity at the center point of the light dispersion carrier is shown in the graph of FIG.
[0043]
As shown in FIG. 4, in Comparative Example 1 indicated by a circle, a decrease in light intensity considered to be a consumption of the discharge lamp was observed, but in this Example 2 indicated by a circle, a stable light intensity was confirmed. It was. As described above, according to the second embodiment, the experiment accuracy is improved by supplying light with a stable light intensity, and it is not necessary to change the set current value by the light intensity measurement that has been frequently performed so far. The work efficiency of experiments etc. has improved. In the second embodiment, a filter having a dimming rate of 0% is used in comparison with Comparative Example 1. However, this stable light controllability can be obtained in the same manner even when other dimming filters are used.
[0044]
As described above, the results and effects confirmed in Example 1 and Example 2 are a wide range of light from weak light intensity to strong light intensity, including zero light intensity, which was substantially difficult with the conventional light source device. Intensity control is measured using a light intensity measurement mechanism consisting of a light scattering part of a light dispersion carrier and a light sensor in the irradiation part, and this value is used to control a filter with a different light attenuation rate and a current value. It became possible for the first time. As will be described later, the control accuracy of the light dispersion carrier was controlled to an accuracy of several μE · m ⁻² · s ⁻¹ . Next, examples relating to simulated sunlight are shown below.
[0045]
[Example 3] Example of control by simulated light of sunlight The measurement results of the temporal change in light intensity with a photon meter for direct light in one day are shown as graphs in FIGS. 5A and 5B. FIG. 5A shows an example of measurement on a clear day around 35 degrees north latitude on August 24, 1997, which was stable with few clouds. FIG. 5B is an example of measurement at the same point on August 25, 1998 when the light intensity varies due to clouds. These measured values are averaged by a control computer at intervals of 15 minutes and are shown as graphs in FIGS. 6A and 6B, and averaged at intervals of 60 minutes as graphs in FIGS. 7A and 7B. As described above, the measurement value of the light intensity can be averaged at intervals of 15 minutes or 60 minutes. By using these measured values and averaged processing values, and determining the relationship between the light intensity of both solar and light-dispersing carriers, the simulated solar light is used as the photoreactor unit. It became possible to supply.
[0046]
In addition, these measured values and averaged values can be called from the input device or stored in the control computer and used repeatedly.
[0047]
In addition, by averaging the light intensity measurement values of sunlight, the number of times that the neutral density filter is driven can be reduced or the solar light intensity curve can be modeled within a range that does not affect the culture characteristics of the photosynthetic culture. It has become possible.
[0048]
Example 4
The light intensity of sunlight is measured in advance using a sunlight tracking direct light sensor located at a location different from the light source device, and the obtained light intensity measurement value is averaged to average the light intensity. The light source device was operated and controlled under the same device configuration as that of Example 2 using the light processing value as the light source control setting value. FIG. 8 is a graph comparing the set value of the light intensity of the light dispersion carrier set in advance in this way with the measured value of the light sensor mounted on the light scattering portion above the light dispersion carrier. According to FIG. 8, as a result, it was confirmed that the measurement control was stably performed within the accuracy of ^{1 to 2} μE · m ⁻² · s ⁻¹ with respect to the set value.
[0049]
【The invention's effect】
The light source device of the present invention is used for general purposes when simulated light of sunlight is required, or when arbitrary light is stably required, such as research, development, and production where light such as photochemical reaction is indispensable In particular, it can be used as a light source device that can simulate sunlight well for use in research of photosynthetic organisms and device development of photosynthesis reaction by sunlight.
[0050]
According to the light source device of the present invention, the light intensity irradiated from the light sensor arranged in the light scattering portion of the light dispersion carrier in the light irradiation portion is actually measured, and using this value, the filter and the artificial light source having different attenuation rates are measured. By controlling the current value, the light intensity can be controlled over a wide range from low light intensity to high light intensity including zero light intensity.
[0051]
In the conventional light source device, it was difficult to cope with the decrease in light intensity considered to be the consumption of the discharge lamp. However, the light source device of the present invention can supply light with high accuracy and stable light intensity. Further, the change of the set current value by the light intensity measurement that has been frequently performed until now is not required in the light source device of the present invention, and the working efficiency of experiments and the like is improved.
[0052]
According to the light source device of the present invention, it is possible to supply simulated sunlight to the photoreactor unit by obtaining the relationship between the light intensities of both the sunlight and the light dispersion carrier on the premise of transmission use. Become.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a light source device according to an embodiment of the present invention.
FIG. 2 is an internal view of the inside of a connection jig for connecting a light transmission emitting part and a light dispersion carrier.
FIG. 3 is a graph showing a result of controlling to obtain an arbitrary light intensity by changing a discharge lamp current amount and a neutral density filter;
4 is a graph comparing the light intensity time course at the center point of the light dispersion carrier of the light source device of Example 2 and the light source device of Comparative Example 1. FIG.
FIG. 5 is a graph showing the measurement results of the temporal change of light intensity by a direct light photon meter on a single day (a fine day and a cloudy day).
6 is a graph showing the result of averaging the measured values of FIG. 5 at 15-minute intervals by a control computer.
7 is a graph showing the result of averaging the measured values in FIG. 5 at 60-minute intervals by a control computer.
FIG. 8 is a graph comparing a preset value of light intensity of a light dispersion carrier with a measurement value of a light sensor attached to a light scattering portion of an upper light receiving portion of the light dispersion carrier.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light source part 2 Power supply part 3 Light control part 4 Light transmission part 5 Cooling part 6 Irradiation part 7 Measurement / control part 8 Photoreactor part 10 Power supply device 11 Lamp house 12 Discharge lamp 13 Reflecting mirror 31 Light control filter 32 Reduction Optical filter 41 Optical transmission incident section 42 Optical transmission main body section 43 Optical transmission exit section 61 Optical dispersion carrier 62 Optical scattering slit section 71 Optical sensor 72 Photosensitive section 73 Connection jig 74 Photosensor 75 for direct sunlight tracking light Input device 76 Control computer

Claims (6)

(1) A light source unit having a discharge lamp in which the intensity of light applied continuously changes depending on the amount of current supplied ;
(2) a power supply unit for supplying power to the discharge lamp of the light source unit;
(3) A dimming unit having a neutral density filter for stepwise dimming the light emitted from the light source unit;
(4) An irradiating unit having a light dispersion carrier for irradiating light modulated by the light modulating unit by light scattering,
(5) a light sensor fixed so that the light scattering portion of the upper end light receiving portion of the light dispersion carrier and the light sensitive portion of the light sensor coincide with each other; and
(6) By changing the current value to the discharge lamp and the dimming rate of the neutral density filter so as to be a preset value of the light intensity of the light dispersion carrier by the measurement value of the photosensor , Measurement / control unit for controlling the light intensity of the light-dispersed carrier irradiation surface,
A light source device comprising: An optical transmission unit that transmits the light that has been modulated to an irradiation unit, a cooling unit that supplies a cooling medium to a heating part, and a photoreactor unit that uses light irradiated from the irradiation unit. 1. The light source device according to 1. The attenuating filter has a total of 3 or more attenuating filters, one with a dimming rate of 0%, one with 100%, and one or more with a value between 0 and 100%. The light source device according to claim 1, comprising: The means for changing the light attenuation rate of the light attenuation filter is arranged such that a plurality of light attenuation filters having different light attenuation rates are arranged in a circular shape, a row shape, or a product shape, and can be exchanged with light attenuation filters having different light attenuation rates. The light source device according to claim 1, wherein an arbitrary neutral density filter can be positioned in the optical path by the driving device. The light source device according to claim 1, wherein the neutral density filter is a neutral density filter made of glass, or a neutral density filter in which small holes are uniformly formed in a plate. The preset value of the light intensity of the light dispersion carrier is data obtained from a sunlight sensor, arbitrary data of a data input device, or data obtained by averaging these data. The light source device according to claim 1.

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