{"product_id":"unihedron-sky-quality-meter-le-sqm-le","title":"Unihedron Sky Quality Meter - LE","description":"\u003ch2\u003eUnihedron Sky Quality Meter - LE\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\"\u003e\n\u003cp\u003e\u003cb\u003eAn ethernet-enabled SQM model for night-time sky brightness monitoring!\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAn affordable meter for continual, connected measuring of sky brightness for astronomers!\u003c\/p\u003e\n\u003cp\u003eThe \"Sky Quality Meter - LE\" measures the brightness of the night sky in magnitudes per square arcsecond.\u003c\/p\u003e\n\u003cp\u003eDesigned by Dr. Doug Welch and Anthony Tekatch\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"10%\"\u003e\n\u003cimg src=\"http:\/\/unihedron.com\/projects\/sqm-le\/sqmleg.gif\" border=\"0\" align=\"left\" alt=\"Live SQM-LE results from Unihedron office\" title=\"This code (sqmlog.pl and sqmplot.pl) is available on the FLASH-drive, see below for link.\"\u003e\u003cbr clear=\"all\"\u003e\n\u003cdiv align=\"center\"\u003eLive SQM-LE results from the Unihedron office\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cb\u003eUses:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFind out how good the night or site REALLY is.\u003c\/li\u003e\n\u003cli\u003eCompare the sky brightness at different sites quantitatively.\u003c\/li\u003e\n\u003cli\u003eDocument the evolution of light pollution in your area.\u003c\/li\u003e\n\u003cli\u003eSet planetarium dome illumination to mimic the skies people are likely to experience elsewhere in the city.\u003c\/li\u003e\n\u003cli\u003eMonitor sky brightness through the night, night-to-night, and year-to-year.\u003c\/li\u003e\n\u003cli\u003eDetermine which nights show the greatest promise for finding the 'faintest fuzzies'!\u003c\/li\u003e\n\u003cli\u003eCalibrate the effect of sky brightness on qualitative measures such as the Bortle Scale.\u003c\/li\u003e\n\u003cli\u003eInvestigate how sky brightness correlates with the solar cycle and month-to-month sunspot activity.\u003c\/li\u003e\n\u003cli\u003eHelp provide local ground truth for future sky brightness prediction with the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/cleardarksky.com\/csk\/\"\u003eClear Sky Clock\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca title=\"Charge-Coupled Device (type of image sensor)\"\u003e\u003cstrong\u003eCCD\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eusers can make a correlation between the SQM reading and when the background reaches some\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"Analog-to-Digital Converter\"\u003e\u003cstrong\u003eADC\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003elevel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSky brightness reported in visual magnitudes per square arcsecond.\u003c\/li\u003e\n\u003cli\u003eInfrared blocking filter restricts measurement to visual bandpass.\u003c\/li\u003e\n\u003cli\u003eSensor temperature, model number, and serial number are provided.\u003c\/li\u003e\n\u003cli\u003ePrecision readings at even the darkest sites.\u003c\/li\u003e\n\u003cli\u003eField-upgradeable\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-le\/updates\"\u003efirmware\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eOpen protocol\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/darksky\/cd\/SQM-LE\/SQM-LE_Users_manual.pdf\"\u003edocument\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWeatherproof Housing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis housing design is made to protect the SQM-LE\/LU from normal outdoor conditions including weather and insects.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhite surfaces reflect the hot summer sunshine.\u003c\/li\u003e\n\u003cli\u003eOpening on bottom to allow moisture to escape.\u003c\/li\u003e\n\u003cli\u003eGlass top to prevent scratching when removing ice.\u003c\/li\u003e\n\u003cli\u003eRaised glass surface to prevent dirt and leaves from collecting.\u003c\/li\u003e\n\u003cli\u003eSmall glass opening to minimize internal heating due to the Sun.\u003c\/li\u003e\n\u003cli\u003eCable opening at bottom sealed with open-cell (breathable) foam prevents insects from entering.\u003c\/li\u003e\n\u003cli\u003eMarine silicone seal rated for outdoor use.\u003c\/li\u003e\n\u003cli\u003eSilicone seal around glass extends beyond glass-plastic interface to prevent ice from building in crevices.\u003c\/li\u003e\n\u003cli\u003eHose clamps for easy mounting to pole.\u003c\/li\u003e\n\u003cli\u003eStaples for easy mounting to wood surface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDetails:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/housing-all.pdf\"\u003eDiagram of all SQM meters that fit into housing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/photos\"\u003ePhotos\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/housing_glass_versions.pdf\"\u003eGlass versions (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/wiring\"\u003eSQM-LE wiring layout inside housing.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eWhat you get:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHousing with removable top cap. 8.8 x 18.7cm, 360g.\u003c\/li\u003e\n\u003cli\u003eTwo adjustable clamps.\u003c\/li\u003e\n\u003cli\u003eTwo staples for mounting to wood.\u003c\/li\u003e\n\u003cli\u003eInstruction sheet.\u003c\/li\u003e\n\u003cli\u003eAn optional PoE (\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-le\/PDFspecs\/PoE\"\u003eLinksys WAPPOE-5V or D-Link DWL-P200 or TL-POE200\u003c\/a\u003e) for extended length SQM-LE installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEthernet connectivity\u003c\/li\u003e\n\u003cli\u003eIncluded applications for reading data in Java, C, Perl, Python.\u003c\/li\u003e\n\u003cli\u003eThe Half Width Half Maximum (HWHM) of the angular sensitivity is ~10°. The Full Width Half Maximum (FWHM) is then ~20°. The sensitivity to a point source ~19° off-axis is a factor of 10 lower than on-axis. A point source ~20° and ~40° off-axis would register 3.0 and 5.0 magnitudes fainter, respectively. Annotated FOV spec.\u003cbr\u003eComparison chart.\u003c\/li\u003e\n\u003cli\u003eOperates from 5-6VDC adapter (included).\u003c\/li\u003e\n\u003cli\u003eSize 3.6 x 2.6 x 1.1 in.\u003c\/li\u003e\n\u003cli\u003eMaximum light sampling time: 80 seconds.\u003c\/li\u003e\n\u003cli\u003eMinimum light sampling time: 1 seconds.\u003c\/li\u003e\n\u003cli\u003eSpecifications are subject to change without notice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003ch4\u003eMeter only:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LE unit\u003c\/li\u003e\n\u003cli\u003eInternational Power adapter\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found online.\u003c\/li\u003e\n\u003cli\u003e6ft Ethernet cable (straight through for connection to hub\/router)\u003c\/li\u003e\n\u003cli\u003eEthernet crossover cable or adapter (for connection directly to PC)\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit MAC address, and calibration values\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat you get (with housing):\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LE unit\u003c\/li\u003e\n\u003cli\u003eInternational Power adapter\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found online.\u003c\/li\u003e\n\u003cli\u003e6ft Ethernet cable (straight through for connection to hub\/router)\u003c\/li\u003e\n\u003cli\u003eEthernet crossover cable or adapter (for connection directly to PC)\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit MAC address, and calibration values\u003c\/li\u003e\n\u003cli\u003eWeatherproof housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat you get (with housing and PoE adapters): \u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LE unit\u003c\/li\u003e\n\u003cli\u003eInternational Power adapter\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found online.\u003c\/li\u003e\n\u003cli\u003e6ft Ethernet cable (straight through for connection to hub\/router)\u003c\/li\u003e\n\u003cli\u003eEthernet crossover cable or adapter (for connection directly to PC)\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit MAC address, and calibration values\u003c\/li\u003e\n\u003cli\u003eWeatherproof housing\u003c\/li\u003e\n\u003cli\u003ePower over Ethernet kit with North American plug (may look different than photo)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eWarranty: Unihedron Warranty\u003c\/p\u003e","brand":"Unihedron","offers":[{"title":"Unihedron Sky Quality Meter-LE","offer_id":46118592086245,"sku":"UH-SQM-LE-2","price":402.0,"currency_code":"CAD","in_stock":true},{"title":"Unihedron Sky Quality Meter-LE+H","offer_id":46118592119013,"sku":"UH-SQM-LEH","price":466.0,"currency_code":"CAD","in_stock":true},{"title":"Unihedron Sky Quality Meter-LE+H+PoE","offer_id":46118679445733,"sku":"UH-SQM-LEHPOE","price":563.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/hbjfew.png?v=1777045108","url":"https:\/\/astronomyplus.com\/products\/unihedron-sky-quality-meter-le-sqm-le","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}