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v:ext="edit" data="1"/> </o:shapelayout></xml><![endif]--> </head> <body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'> <div class=Section1> <p class=MsoNormal>&nbsp;</p> <p align=center class="style4" style='text-align:center'>Cloud Sensors</p> <p align=center class="style1" style='text-align:center'>The peltier cloud sensor</p> <p>These pictures show the construction of a peltier cloud detector made from a coffee can top and bottom. I gleaned most information from the web at this site <a href="http://www.astro.uni-bonn.de/~kbagschi/cloud.shtml">http://www.astro.uni-bonn.de/~kbagschi/cloud.shtml</a></p> <p class=MsoNormal align=center style='text-align:center'><a href="dsc04939.jpg"><span style='mso-fareast-font-family:"Times New Roman";mso-no-proof:yes;text-decoration: none;text-underline:none'><img border=0 width=150 height=110 id="_x0000_i1029" src=dsc04939.gif></span></a><a href="dsc04940.jpg"><span style='mso-fareast-font-family: "Times New Roman";mso-no-proof:yes;text-decoration:none;text-underline:none'><img border=0 width=150 height=110 id="_x0000_i1028" src=dsc04940.gif></span></a><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></p> <p>I used a can opener to take the top and bottom off a coffee can. I crimped very carefully arround the edges so they would not be sharp. </p> <p class=MsoNormal align=center style='text-align:center'><a href="dsc04942.jpg"><span style='mso-fareast-font-family:"Times New Roman";mso-no-proof:yes;text-decoration: none;text-underline:none'><img border=0 width=150 height=110 id="_x0000_i1027" src=dsc04942.gif></span></a><a href="dsc04943.jpg"><span style='mso-fareast-font-family: "Times New Roman";mso-no-proof:yes;text-decoration:none;text-underline:none'><img border=0 width=150 height=110 id="_x0000_i1026" src=dsc04943.gif></span></a><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></p> <p>I held the coffee can parts together and drilled holes for four nylon screws to hold the coffee can parts together I then placed a peltier chip with a heat conductive grease on the center of one coffee can part. The white square part in the center surrounded by black foam pads is the peltier chip. The plastic foam pads around the outside edge prevent the two from touching. I brought the wires out between the foam pads and used nylon screws, washers and nuts to clamp the two coffee can parts together. </p> <p>After assembly I sealed the opening between the coffee can parts with silicone sealant so water can not get in. I then spray painted the detector with flat black paint. I connected the unit to a computer USB analog to digital voltmeter device USB-1208FS from Measurement Computing <a href="http://www.measurementcomputing.com">http://www.measurementcomputing.com</a> and can now measure the voltage induced when the top is warmer or cooler than the bottom.</p> <p class=MsoNormal align=center style='text-align:center'><span style='mso-fareast-font-family:"Times New Roman"'><a href="dsc04942.jpg"><o:p></o:p></a></span></p> <p align=center style='text-align:center'><a href="dsc05021.JPG"><span style='mso-no-proof:yes;text-decoration:none;text-underline:none'><img src=dsc05021.gif name="_x0000_i1025" width=276 height=207 border=0 id="_x0000_i1025"></span></a></p> <p>The peltier unit is shown above on the right next to another home made cloud detector described below. The principle behind the peltier detector is the fact that when the sky is clear at night it is cooler than the ground and the two pieces of the coffee can gain or lose heat and generate an electric voltage. I made sure that when the top is cooler than the bottom it generates a positive voltage. I found that the peltier generates about 8 to 12 mv when exposed to a clear cloud free sky. </p> <p align=center class="style5" style='text-align:center'>The Infrared Thermometer Cloud Sensor</p> <p>The green device on the right is a Sper Scientific Ltd. narrow focus infrared remote sensor thermometer model #800002 with RS232 serial readout from <a href="http://www.technika.com/index.html">http://www.technika.com/index.html</a>. I modified the remote sensor and placed it in the green sealed water-tight container. There is a piece of plastic wrap over the sensor which lets the unit measure temperature without getting wet. The sensor is sealed in the top center with silicone around it to seal the hole and hold it in place. This unit puts out a reading of the sky temperature. When the sky is clear the temperature is lower by a long ways usually by about 12 or more degrees lower than the outside ambient and this unit can respond to clouds faster than the peltier unit. </p> <p>Both units work quite well and allow me to monitor the sky for clouds coming in during my picture runs.</p> <p align="center" class="style5">Weather Station</p> <p>When I purchased my dome from Technical Innovations, I also purchased a Davis Vantage Pro2 weather station from them which can monitor the weather outside and alerts me of wind and temperature problems. The Dome Works software from Technical Innovations can shut down the dome if weather conditions are not good for opening the dome based on information from the Davis unit.</p> <p>&nbsp;</p> <p align=center style='text-align:center'>&nbsp;</p> <p align=center style='text-align:center'>&nbsp;</p> </div> </body> </html>