JPH04241B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application) The present invention relates to a simulated sunlight irradiation device, and particularly relates to a simulated sunlight irradiation device whose configuration is simplified by minimizing the number of required filters. It is something.

(Prior Art) As is well known, a simulated sunlight irradiation device is a light source device for reproducing the spectral distribution of natural sunlight with high precision. Such a simulated sunlight irradiation device is indispensable for performance measurement and accelerated deterioration tests of various solar energy utilization devices, such as the photoelectric conversion characteristics of solar cells.

A xenon short arc lamp is widely used as a light source for a conventional simulated sunlight irradiation device. However, as shown in the spectral distribution diagram in Figure 1, the light emission from a xenon short arc lamp is
Since it has a group of sharp and complex peaks in the near-infrared region (800 to 1000 nm), a multilayer mock interference filter is used in order to average out these peaks and bring it closer to the spectral distribution of natural sunlight. There are many things.

An example of the emission spectrum distribution of the simulated sunlight irradiation device using the xenon short arc lamp corrected as described above is shown by the solid line in FIG. The dashed line in the figure is the spectral distribution of natural sunlight (in the case of zero air mass).

As can be seen from this figure, even in the conventional simulated sunlight irradiation device, the spectral distribution is, on average, quite close to that of natural sunlight.
It can also be used for practical purposes.

However, as shown in Figure 3, in order to more accurately measure the photoelectric conversion characteristics of various solar cells with spectral sensitivity characteristics over a wide range from the ultraviolet region to the near-infrared region, against natural sunlight, However, the conventional simulated sunlight irradiation device using a combination of a xenon lamp alone and a multilayer interference filter, that is, a dichroic filter, is still insufficient.

The reason for this is that, as is clear from the spectral distribution in FIG. 2, a considerable number of peaks still remain in the near-infrared region in the range of 750 nm to 1000 nm, which causes measurement errors.

As a means to reduce the aforementioned peak groups, bring the spectral distribution closer to that of natural sunlight, and improve spectral accuracy, we have used xenon short films with a relatively continuous spectral distribution in the UV and visible regions. It has been proposed to combine, superimpose, or mix the light emission of an arc lamp and the light emission of an incandescent (tungsten) filament lamp, which has a continuous spectral distribution in the near-infrared region.

An example of the composite spectral distribution in this case is shown in FIG. In the same figure, curve L1 is a spectral distribution characteristic curve obtained by removing components on the longer wavelength side than near infrared light from the light emitted by the xenon short arc lamp 11, and curve L2 is the visible light emitted from the incandescent filament lamp. This is a spectral distribution characteristic curve with light and ultraviolet components removed.

Further, a curve L3 is a combined spectral distribution characteristic curve obtained by superimposing or mixing the curves L1 and L2. Note that the solid line curve L4 shows the same spectral distribution characteristics of natural sunlight as in FIG. 2 for comparison.

From this figure, we can see that by superimposing and mixing the light emitted by a xenon short arc lamp, which removes components on the longer wavelength side than near-infrared components, and the light emitted by an incandescent filament lamp, which removes visible and ultraviolet components, it is possible to generate natural sunlight. It can be seen that a spectral distribution that closely approximates the spectral distribution can be obtained, and that irregular peak groups in the near-infrared region, which cause measurement errors in conventional devices, can be reduced.

The specific configuration of a simulated sunlight irradiation device with such a spectral distribution is usually considered to be a first light source that combines a xenon short arc lamp with a filter that removes light with wavelengths longer than near-infrared. A second light source device that combines an incandescent filament lamp with a filter that removes light in the visible and ultraviolet regions is prepared, and the light emitted from these two light source devices is directed to a single integrating optical system. It is to superimpose and mix.

However, such a configuration is expected to have the following drawbacks.

(1) The same number of filters as the number of xenon short arc lamps and incandescent filament lamps (e.g.
Dichkreuzk filter) is required.
Not only does the device become larger and maintenance becomes more troublesome, but the cost also increases.

(2) It is extremely difficult to manufacture a plurality of individual filters with the same filter characteristics, and the uniformity and reproducibility of the overall spectral distribution characteristics are insufficient.

(3) In order to increase light collection efficiency, a large condensing mirror or condensing lens is required, as well as a large-sized filter. It is extremely difficult to equalize the filter characteristics of the two, and it is difficult to obtain the desired overall spectral distribution.

(Purpose) The present invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to create a pseudo-solar system that has sufficiently high uniformity and reproducibility of integrated spectral distribution characteristics for practical use, and that is relatively small and inexpensive. An object of the present invention is to provide a light irradiation device.

(Summary) To achieve the above objects, the present invention provides a single method for removing the near-infrared component from the emission spectrum of a xenon short arc lamp and extracting the near-infrared component from the emission spectrum of an incandescent filament lamp. A filter means is provided, and the near-infrared component extracted by the filter means of the light emission from the xenon short arc lamp from which the near-infrared component has been removed and the light emission from the incandescent filament lamp is integrated into a single integral. It is distinctive in that it is configured so that it enters the optical system coaxially.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 5 is a side view showing a schematic configuration of an embodiment of the present invention.

The xenon short arc lamp 11 has a condenser mirror 15, and an integrating optical system 14 is arranged on the optical axis of the xenon short arc lamp 11.

Xenon short arc lamp 11 and integrating optical system 14
intersects the optical axis (preferably at 45°).
The cold filter 13 is arranged so as to reflect infrared rays and transmit visible light and ultraviolet rays.

The incandescent filament lamp 12 also has a condenser mirror 16. The light emitted from the incandescent filament lamp 12 is projected onto the surface of the cold filter 13 on the integrating optical system 14 side, and the near-infrared component light reflected there exits from the condenser mirror 15 and passes through the cold filter 13.
The visible and ultraviolet components of the light from the xenon short arc lamp 11 are coaxially directed toward the integrating optical system 14.

The light superimposed and mixed by the cold filter 13 and the integrating optical system 14 is applied to the irradiated sample 1.
Evenly distributed over 7. The heat absorber 20 functions to absorb infrared and near-infrared component light from the xenon short arc lamp reflected by the cold filter 13.

According to this embodiment, the xenon short arc lamp 1 is controlled by the single cold filter 13.
Since the infrared and near-infrared components can be removed from the light emitted by the incandescent filament lamp 12, and the near-infrared component can be extracted from the light emitted by the incandescent filament lamp 12, the configuration can be simplified and miniaturized, and the cost can be reduced. It is clear that it can be done.

Furthermore, in this embodiment, one filter extracts and adds the long wavelength side component and the short wavelength side component from the light emitted from the two light sources, so the filter characteristics of the cold filter 13 are slightly different. Even if there is a change, the spectral distribution of the output light that is finally obtained does not change much, which is an advantage. Therefore, the tolerance for the filter characteristics of the cold filter 13 is increased, and manufacturing costs can also be reduced.

FIG. 6 is a side view showing a schematic configuration of another implementation instruction of the present invention. In this figure, the same reference numerals as in FIG. 5 represent the same or equivalent parts.

As can be easily understood from the comparison with Figure 5,
This embodiment corresponds to the configuration shown in FIG. 5 in which the xenon short arc lamp 11 and the incandescent filament lamp 12 are exchanged, and the cold filter 13 is replaced with an infrared-transmissive cold mirror 19. Infrared transmission cold mirror 1
9 transmits infrared rays and reflects visible light and ultraviolet rays.

It will be clear that the configuration of FIG. 6 achieves exactly the same operation and effect as the embodiment of FIG. 5.

In any of the embodiments described above, a multilayer interference filter or the like is used as the condenser mirror 16 to partially transmit infrared rays and thereby modify the spectral distribution in the infrared region. By appropriately selecting the spectral reflection characteristics of 15, the irradiated sample 1
The integrated spectral distribution characteristics of the output light obtained on 7 can be brought closer to those of natural sunlight.

(Effects) As is clear from the above description, according to the present invention, the following effects are achieved.

(1) Since the number of necessary filters can be halved, the device can be made smaller and costs can be reduced.

(2) removal of the near-infrared component from the emission of a xenon short arc lamp by a single shared filter;
Near-infrared components are extracted from the light emitted from the incandescent filament lamp 12 at the same time.
Therefore, compared to using multiple filters to remove the near-infrared component from the light emission of a xenon short arc lamp and to extract the near-infrared component from the light emission of an incandescent filament lamp, the filter Sufficient effects can be obtained even if the permissible accuracy of the characteristics is low.

That is, when the near-infrared components are removed and extracted separately using a plurality of filters, it is necessary to ensure that the boundaries of the removal and extraction regions by each filter coincide precisely. Otherwise, when combining the light of the xenon short arc lamp with the near-infrared component removed and the light of the near-infrared component extracted from the light of the incandescent filament lamp, the spectral distribution will accurately match that of natural sunlight. It becomes impossible to match.

On the other hand, if a single filter is used to remove and extract the near-infrared component, the near-infrared component can be removed and the boundaries of the extraction region can be easily marked. Can be matched.

In this way, even if the characteristics of the filter are slightly different, the spectral distribution of the output light that is finally obtained does not change, so the uniformity and reproducibility of the combined spectral distribution characteristics are improved.

[Brief explanation of drawings]

Figure 1 shows the spectral distribution of light emitted by a xenon short arc lamp, Figure 2 shows a comparison of the spectral distribution of a modified xenon short arc lamp with that of natural sunlight, and Figure 3 shows the spectral distribution of various types of solar cells. Figure 4 is a diagram showing the spectral sensitivity characteristics, Figure 4 is a diagram showing the spectral distribution characteristics of synthetic light and natural sunlight obtained by superimposing a xenon short arc lamp and an incandescent filament lamp, Figures 5 and 6 are:
FIG. 3 is a schematic side view showing an embodiment of the present invention. 11...xenon short arc lamp, 12...incandescent filament lamp, 13...infrared reflective cold filter, 14...integrating optical system, 15...
Concentrating mirror, 17...Irradiated sample, 19...Infrared transmission cold mirror, 20... Heat absorber.

Claims (1)

[Claims] 1. A pseudo sunlight system in which light from a xenon short arc lamp and light from an incandescent filament lamp pass through an integrating optical system, thereby uniformly distributing and irradiating the mixed light onto the irradiated sample. The irradiation device comprises a single multilayer interference filter means for removing near-infrared components from the emission spectrum of the xenon short arc lamp and extracting near-infrared components from the emission spectrum of the incandescent filament lamp, The integrating optical system extracts the light from the xenon short arc lamp from which the near-infrared component has been removed by the filter means, and the light of the near-infrared component extracted by the filter means from among the light from the incandescent filament lamp. A pseudo sunlight irradiation device characterized by a single integrating optical system that receives sunlight. 2. The filter means is a cold filter that is arranged obliquely with respect to the optical axis of the integrating optical system and reflects near-infrared component light, and xenon is placed behind the cold filter on the optical axis of the integrating optical system. The simulated sunlight irradiation device according to claim 1, characterized in that a short arc lamp is arranged and an incandescent filament lamp is arranged in front of the cold filter. 3. The filter means is an infrared transmitting type cold mirror that is disposed obliquely with respect to the optical axis of the integrating optical system and transmits near-infrared component light; An incandescent filament lamp is placed behind the cold mirror,
The pseudo sunlight irradiation device according to claim 1, further comprising a xenon short arc lamp disposed in front of the cold mirror. 4. The above-mentioned device is characterized in that an infrared spectrum correction means is provided in the middle of the optical path from the incandescent filament lamp to the filter means, for weakening the infrared component of the emission spectrum of the incandescent filament lamp to increase its color temperature. Claim 1
The pseudo sunlight irradiation device according to any one of Items 1 to 3. 5. The pseudo sunlight irradiation device according to claim 4, wherein the infrared spectrum correction means is a multilayer reflective surface that partially transmits infrared rays.