Digital Exposure System, Solar Simulators

The 68951 Digital ExposureSystem is a light intensity controller and digital timer in one package. It maintains a constant light level and allows preset timed or dosage based exposure control. The 68951 is made up of a light sensing head, a controller, and a fiber optic probe. The controller may be controlled via a PC through an RS-232 interface. The silicon based light sensor monitors part of the light source output (via the fiber probe), and the controller constantly compares the recorded signal to the set level and changes the power supply output accordingly to keep the measured signal at this user-deifned level. Automatic detector gain setting allows the unit to work with 300 to 1600 W solar simulator models.

The 68951 also allows for timed exposures. The 68951 is capable of exposure times from 10 ms to 9999 hours, in increments as short as 10 ms. However, the mechanical response time of the shutter in our solar simulators limits the minimum exposure time to 100 ms, and the shortest interval between exposures to 80 ms. For those instances when a timed exposure is not sufficient, the auto-dose mode can be implemented to keep the shutter open until the total flux equals a user set value.

The system consists of the following:

• 68945 Digital Exposure Controller
• 71582 SI, UV Enhanced Cooled Detector Head
• 70018 BNC cable
• 70062 Temperature Control cable
• 70043 Specialty Connector cable
• 68957 Fiber Optic Probe