{"product_id":"unihedron-sky-quality-meter-lr-sqm-lr","title":"Unihedron Sky Quality Meter - LR (SQM-LR)","description":"\u003ch2\u003eUnihedron Sky Quality Meter - LR\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" with=\"100%\"\u003e\n\u003cp\u003e\u003cb\u003eAn RS232 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 - LR\" 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\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\u003eClear Sky Clock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCCD\u003c\/strong\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\u003cstrong\u003eADC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003elevel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eDeployment:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLegacy computer interface installations.\u003c\/li\u003e\n\u003cli\u003eMODEM interface installations.\u003c\/li\u003e\n\u003cli\u003eSimple electronic interface projects.\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 firmware.\u003c\/li\u003e\n\u003cli\u003eOpen protocol\u003cspan\u003e \u003c\/span\u003edocument.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRS232 connectivity\u003c\/li\u003e\n\u003cli\u003eIncluded applications for reading data in Perl.\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.\u003cspan\u003e \u003c\/span\u003eAnnotated FOV spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eComparison chart\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.\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\u003cul\u003e\n\u003cli\u003eSQM-LR unit\u003c\/li\u003e\n\u003cli\u003eSQM-LR users manual\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found\u003cspan\u003e \u003c\/span\u003eonline.\u003c\/li\u003e\n\u003cli\u003e6ft RS232 straight through cable\u003c\/li\u003e\n\u003cli\u003eInternational AC adapter\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit serial number, and calibration values\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarramty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eWarranty : Unihedron warranty\u003c\/p\u003e\n\u003cp\u003eManual: Unihedron\u003c\/p\u003e","brand":"Unihedron","offers":[{"title":"Default Title","offer_id":48958634918062,"sku":"dii1787937730457","price":144.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0695\/2727\/3646\/files\/unihedron-sky-quality-meter---lr-sqm-lr_1.png?v=1787937740","url":"https:\/\/www.pleasantparcel.shop\/products\/unihedron-sky-quality-meter-lr-sqm-lr","provider":"My Store","version":"1.0","type":"link"}