1. Overview (Purpose)
This test aims to verify the reproducibility and stability of irradiance when illumination is resumed after the shutter has been closed in a solar simulator.
In actual operation, the shutter is frequently closed for sample exchange and measurement preparation. Therefore, how quickly the irradiance stabilizes after reopening the shutter, and whether the duration of shutter closure affects the irradiance, are important factors related to the reproducibility and operability of the system.
In this test, the temporal variation of irradiance was measured under different shutter-closure durations in order to examine whether the duration of shutter closure influences the irradiance behavior.
2. Test Conditions
| Item | Condition |
| Model | XES-300S1 |
| Light source | Xenon lamp |
| Irradiance setting | 1 SUN |
| Warm-up time | 30 min |
| Measurement duration | 5 min |
| Sampling interval | 0.5 s |
| Shutter close duration | 1 min / 1 hour |
For reliability verification, two pyranometers (Main / Sub) were used in the measurements.
3. Optical Configuration (Reference)
The optical configuration of this model is as follows:
Lamp
→ Reflector
→ AM Filter
→ Shutter
→ Integrator Lens
→ Reflector
→ Collimator Lens
→ Irradiation Plane
Note: The optical configuration may vary depending on the model.
4. Measurement Results
The temporal variation of irradiance after reopening the shutter is shown below.
The difference in shutter close duration (1 min / 1 hour) was confirmed not to affect irradiance reproducibility after illumination was resumed.
5. Observations
The following tendencies were observed in this test:
- No difference in irradiance behavior was observed between the shutter close durations (1 min / 1 hour).
- The measurement results obtained from the main and sub pyranometers were generally consistent, confirming the reproducibility of the measurements.
- A gradual change in irradiance was observed immediately after reopening the shutter; however, this behavior is considered to be mainly due to the temperature characteristics of the pyranometer.
6. Evaluation
A comparison of irradiance behavior after shutter reopening under shutter closure durations of 1 minute and 1 hour confirmed that the rise characteristics of irradiance were nearly identical under both conditions. In both cases, the irradiance was stable immediately after the shutter was opened, and a slight increasing trend was observed over time.
This behavior is considered to be attributable to the temperature characteristics of the pyranometer, as confirmed in the 24-hour continuous irradiation test, and is presumed not to indicate a change in the irradiance of the light source itself.
No significant difference in irradiance level or recovery behavior was observed between the different shutter closure durations.
These results confirm that the duration of shutter closure does not have a substantial effect on irradiance reproducibility or stability after shutter reopening. Therefore, normal operational shutter operations associated with sample exchange or measurement preparation are not expected to affect the irradiation conditions of the solar simulator.
Furthermore, the results suggest that the optical system and thermal behavior of this model are stable. Since no difference in irradiance behavior was observed even when the shutter closure duration was varied from 1 minute to 1 hour, the influence of thermal state changes in the optical system caused by shutter operation is considered to be extremely small. This indicates that the irradiation conditions can be reproduced stably even after operational procedures such as sample exchange, which is regarded as a favorable characteristic in terms of operational reproducibility of the system.
For further discussion of this behavior, please refer to the results of the 24-hour continuous irradiation test.
7. Notes
The results presented here are based on measurements obtained under the specific test conditions and for the model tested.
Results may differ if the optical configuration or operating conditions vary.
8. Measurement Method and Equipment
For details regarding the measurement method and equipment used, please refer to the following.
Measurement Method and Equipment
9. Measurement Data
This page provides the measured values and graphs obtained in the test.
Raw data (CSV) are available for members.
Download CSV – Members only
10. Contact
For inquiries regarding this test or the product described, please contact us using the following form.