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The ORG measures rainfall by detecting the optical irregularities induced within the sample volume by precipitating particles falling through a beam of partially coherent infrared light. These irregularities are known as scintillation. By detecting the intensity of the scintillation, the actual rainfall rate can be measured.

This particular rain gauge is an optical independent analog unit consisting of a frame that contains 1) the transmit head, 2) a receive head and electronics, and 3) a 15-meter-long power/signal cable. The transmit head contains an infrared-emitting diode and lens with heater. The other head contains a photodiode, lens and aperture, heater, electronics, and cable connectors. All wiring between the heads runs within the frame.

ORG Precipitation Rate

North Slope Alaska

• Latitude: 71.323
• Longitude: -156.609
• Publication Date: 1998-03-20
• Start Date: 1998-03-20
• End Date: 2003-10-13
• Last Updated: 2003-10-16

https://www.arm.gov/connect-with-arm/organization/instrument-mentors/list#org

Mary Jane Bartholomew

Brookhaven National Laboratory

Jenni Kyrouac

Argonne National Laboratory

http://dx.doi.org/10.5439/1046212
Atmospheric Radiation Measurement (ARM) user facility. 1998, updated hourly. Optical Rain Gauge (ORG). 1998-03-20 to 2003-10-13, North Slope Alaska (NSA) Central Facility, Barrow AK (C1). Compiled by J. Kyrouac and M. Bartholomew. ARM Data Center. Data set accessed at http://dx.doi.org/10.5439/1046212.