Figure 2: Video System Set Up for Cooker Optimization
Figure 2 shows a view similar to Figure 1, but with the video system running. The light source inside the plastic pail that replaces the pot in the cooker has been turned on. The camcorder that is on a tripod about 50 feet in front of the cooker, at the height of the center of the pot, has been turned on. The video signal is being transmitted to the TV monitor which appears in the upper left corner of Figure 2. The illuminated area on the TV screen represents the effective area of the cooker. The objective of the optimization is to adjust the shape of the cooker to maximize the illuminated area on the TV screen.
While performing the optimization procedure, the operator watches the TV monitor, and adjusts the shape of the cooker as necessary to maximize the illuminated area. Experience has shown that is helpful, before performing the optimization process, to place a clear plastic sheet over the face of the TV. Then, with the video system on, use an erasable marker to sketch the approximate outline of the initial illuminated area on the plastic sheet. This allows the operator to compare the changing illuminated area to the initial illuminated area. Normally, a video record of the optimization procedure is recorded on the camcorder. Also, the microphone, which is located near the cooker, allows the operator to add an audio description of the optimization process to the video record as it is being recorded.
Usually, the Reciprocal Optical Test for Measuring Solar Cooker Performance is performed before and after the real time video optimization procedure to more accurately determine how much the optimization improved the performance of the cooker.
The camcorder that is being used with the Reciprocal Video System is a Canon VIXIA HF R80. The video monitor is a 19 inch Element flat Screen TV. The TV is connected to the camcorder with 70 feet of HDMI cable. Also, the dynamic microphone is connected to the camcorder with 70 feet of microphone cable.