Changes between Version 58 and Version 59 of RoboDIMM
- Timestamp:
- Dec 7, 2010, 11:02:12 PM (16 years ago)
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RoboDIMM
v58 v59 437 437 == PS1-Skin-Seeing == 438 438 439 The potential for skin seeing at PS1 is being investigated in two ways. A temperature monitoring system has been installed and series of seeing measurements has been initiated.439 "Skin seeing" is a degradation in seeing due to a temperature differential between ambient and the surface of a dome. White domes, while reflecting heat during the day, cool to below ambient during the night. The potential for skin seeing at PS1 is being investigated with a temperature monitoring system and series of seeing measurements using two RoboDIMMs. 440 440 441 441 === __Skin Temperature Monitoring System__ === 442 442 443 To investigate whether a "skin seeing"issue exists at PS1 a monitoring system has been installed to measure dome skin and adjacent ambient temperatures. The system consists of three Resistance Temperature Detectors (RTDs) and a RTD input module. The photos show the placement of the sensors. The first dangles in the end a piece of 3/4" PVC. The sensor is shaded but the bottom of the tube is cut out to allow air flow. The sensor is approximately 2' away from the dome. The second sensor is taped to the dome with aluminum tape. The third is held against the dome surface by a 1" x 1" x 1/2" piece of closed-cell foam epoxied to the surface. Sensors two and three have a coating of thermal conductive paste. The sensors are wired to an ADAM-6015 RTD input module through the unused vent 3. The input module is polled every minute by a script on Otis 7. The data is recorded in /export/home/otis/skintemp/data with file names yyyymmdd.skintemp.dat443 To investigate whether a skin seeing issue exists at PS1 a monitoring system has been installed to measure dome skin and adjacent ambient temperatures. The system consists of three Resistance Temperature Detectors (RTDs) and a RTD input module. The photos show the placement of the sensors. The first dangles in the end a piece of 3/4" PVC. The sensor is shaded but the bottom of the tube is cut out to allow air flow. The sensor is approximately 2' away from the dome. The second sensor is taped to the dome with aluminum tape. The third is held against the dome surface by a 1" x 1" x 1/2" piece of closed-cell foam epoxied to the surface. Sensors two and three have a coating of thermal conductive paste. The sensors are wired to an ADAM-6015 RTD input module through the unused vent 3. The input module is polled every minute by a script on Otis 7. The data is recorded in /export/home/otis/skintemp/data with file names yyyymmdd.skintemp.dat 444 444 445 445 === __Dual DIMM Measurements__ === 446 446 447 * Dual DIMM Calibration 448 449 On May 28, 2010, two RoboDIMMs collected data pointing at Polaris from the PS2 dome. 450 451 * Dual RoboDIMMs August 25, 2010 452 453 The RoboDIMMs were set up south of PS1 so they point at Polaris along the west side of the dome. To get the star to appear just off the widest part of the dome the DIMMs were placed about 20' off the road in the area leading toward the former location of the ATST tower. To locate the DIMM measuring seeing near-dome the DIMM was moved east until the images were blocked by the dome then moved west until they were just clear. The other DIMM was placed 5' to the west. 447 The remaining original RoboDIMM control computer ran Windows 98 on an old machine. The requirements of running the RoboDIMM program often left the time significantly off despite the attached GPS receiver. To get measurements from two RoboDIMMs relatively close in time two relatively modern laptops running Windows XP were built with all of the required software. 448 449 On May 28, 2010, two RoboDIMMs separated by a distance of about 10 feet collected simultaneous data on Polaris from the PS2 dome that indicate the two DIMMs are quite well correlated. 450 451 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/DuoDIMMS-5.28.10.jpg DIMM Dual DIMM Calibration] 452 453 Dual RoboDIMMs 454 455 On August 25, 2010, the two RoboDIMMs were set up south of PS1 spointing at Polaris along the west side of the dome. To get the star to appear just off the widest part of the dome the DIMMs were placed about 20' off the road in the area leading toward the former location of the ATST tower. To locate the DIMM measuring seeing near-dome the DIMM was moved east until the images were blocked by the dome then moved west until they were just clear. The other DIMM was placed 5' to the west. 454 456 455 457 During the time the data was collected the dome was basically stationary while the observer, Natalia, was taking pinhole data on the moon. Because the moon was rising the near-dome measurements were made off the surface of the rear shutter. … … 459 461 == Reber-Circle-Seeing == 460 462 461 A series of measurements were made to characterize the seeing in the vicinity of Reber Circle. One set of observations was undertaken to determine if there is significant variation in seeing across Reber Circle. A second set was made to compare seeing at the center of Reber Circle to that at the top of the Airglow building. RoboDIMM locations are marked on 463 A series of measurements were made to characterize the seeing in the vicinity of Reber Circle. One set of observations was undertaken to determine if there is significant variation in seeing across Reber Circle. A second set was made to compare seeing at the center of Reber Circle to that at the top of the Airglow building. For comparison RoboDIMM data was plotted against seeing data acquired by the Day-Night Seeing Monitor (DNSM). Plotted DNSM data has been corrected to zenith and converted from r0 to FWHM. 464 465 466 To measure the variation in seeing across Reber Circle a static RoboDIMM (Location 0 on map) was positioned just off the asphalt NE of Airglow. Simultaneous measurements were made with the static DIMM and a second RoboDIMM at a series of four locations approximately 8 feet apart in a N-NW line (Locations 1-4 on map). 462 467 463 468 === __September 2, 2010__ === 464 469 465 The "static" RoboDIMM is located approximately near the "C" in the "Reber Circle" label on the site plan. Locations 1 and 2 are 8' and 16', respectively, NE of of the static location. (BTW, there appears to be location issue with respect to the containers because they're definitely further north.) 466 467 Winds all night were light, <3.5 m/s. Throughout the night both RoboDIMMs and the DNSM were looking at stars high in the sky. The DNSM was pointed at Altair all night. Both RoboDIMMs measured Antares during the data taking at Location 1. Around 6:30 UT some high clouds moved in. I believe this accounts for the degradation in seeing and the lack of DNSM data points. Because the DIMMs, particularly the static one, were struggling to keep their stars on the focal plane both were moved to Altair which was further south. 470 Measurements were made at Locations 1 and 2. Winds all night were light, <3.5 m/s. Throughout the night both RoboDIMMs and the DNSM were looking at stars high in the sky. The DNSM was pointed at Altair all night. Both RoboDIMMs measured Antares during the data taking at Location 1. Around 6:30 UT some high clouds moved in. I believe this accounts for the degradation in seeing and the lack of DNSM data points. Because the DIMMs, particularly the static one, were struggling to keep their stars on the focal plane both were moved to Altair which was further south. 468 471 469 472 * [https://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/attachment/wiki/RoboDIMM/Reber-seeing-9.2.10.jpg Seeing Plot]
