红外皮温参数

SI-111 Precision Infrared Radiometer Th e SI-111* is a precision, infrared radiometer that makes continuous measurements in fi eld conditions. Infrared temperature sensors provide a non-contact means of measuring the surface temperature of an ob- ject or surface by sensing the infrared radiation given off by the subject. Th is unique sensor is manufactured by Apogee Instruments Inc. (Logan, UT). Typical applications include: Road surface temperature• Plant canopy temperature for irrigation scheduling • and crop water stress Soil, snow, and water surface temperatures• The SI-111 is comprised of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature probes are housed in a rugged aluminum body that contains a germanium window. When compared with the silicon window of its predecessor, the germanium window facilitates correction of target emissivity, reduces the effect of atmospheric humidity, and allows the sensor to be used at greater distances from the target. Both the thermopile and the thermistor output a millivolt signal. Our dataloggers measure the milli- volt signals and apply the Stefan-Boltzman equation, which corrects for the eff ect of sensor body tempera- ture on the target temperature. Use of the Stefan- Boltzman equation allows the SI-111 to achieve an absolute accuracy of ±0.2°C from -10° to 65°C. Mounting The SI-111 is often mounted to a CM202, CM204, or CM206 crossarm, a tripod or tower mast, or a user-supplied pole via a CM220 Right Angle Mount or CM230 Adjustable Inclination Mount. Th e SI-111 should be mounted perpendicular to the target surface. Therefore, the CM230 mount is recom- mended when the target surface is on an incline. Th e SI-111 may also be mounted directly to a user- supplied camera tripod. The SI-111 is mounted to a CM204 crossarm via the CM230; the CM230 allows the sensor to be pointed at the surface of interest. The SI-111 is mounted to a CM204 crossarm via the CM220 Right Angle Mount. *Prior to November 2008, the SI-111 was named the IRR-P. 815 W. 1800 N. | Logan, Utah | 84321-1784 | USA | (435) 753-2342 | www.campbellsci.com Australia | Brazil | Canada | England | France | Germany | South Africa | Spain | USA [headquarters] Ordering Information Model Description SI-111 Precision Infrared Radiometer with 15-ft cable SI-111-PW Precision Infrared Radiometer with 15-ft cable and connector for attaching sensor to a prewired enclosure. Mounting Hardware CM220 Right Angle Mount CM230 Adjustable Angle Mounting Kit that allows the SI-111 to be pointed at the surface of interest CM202 Two-foot crossarm that attaches the CM220 or CM230 to a tripod or tower CM204 Four-foot crossarm that attaches the CM220 or CM230 to a tripod or tower CM206 Six-foot crossarm that attaches the CM220 or CM230 to a tripod or tower CM210 Bracket Aluminum Pipe The CM202 (shown), CM204, and CM206 crossarms consist of a 1” IPS anodized aluminum pipe and a CM210 bracket that attaches to the tripod or tower. Specifi cations Datalogger Channels: one diff erential (thermopile) and one single-ended (thermistor); please note that our CR200-series dataloggers are not compatible. Input Power: 2.5 V excitation for thermistor Absolute Accuracy: ±0.2°C @ -10° to +65°C; ±0.5°C @ -40° to +70°C Uniformity: ±0.1°C @ -10° to +65°C; ±0.3°C @ -40° to +70°C Repeatability: ±0.05°C @ -10° to +65°C; ±0.1°C @ -40° to +70°C Response Time: <1 s to changes in target temperature Target Temperature Output Signal: 60 μV per °C diff erence from sensor body Body Temperature Output Signal: 0 to 2500 mV Optics: Germanium lens Wavelength Range: 8 to 14 μm (corresponds to atmospheric window) Field of View (FOV): 22° half angle. Th e FOV is reported as the half-angle of the apex of the cone formed by the target (cone base) and the detector (cone apex). Th e target is a circle from which 98% of the radiation viewed by the detector is being emitted. Operating Range: -55° to +80°C; 0 to 100% RH Cable Description: 15’ (4.5 m) twisted, shielded 4-conductor wire with Santoprene casing, ending in pigtails. Dimensions: 0.9” (2.3 cm) diameter, 2.4” (6 cm) length Weight: 6.7 oz. (190 g) SI-111Half Angle Target Distance ↓ Ta rg et D ia m et er ↕ ↗ ↘ Copyright © 2006, 2009 Campbell Scientifi c, Inc. Printed April 2009