Abstract:
A moisture sensor is provided that simultaneously achieves ruggedness, sensitivity, wide dynamic range, versatility of application, and low cost. The outer, top service of the sensor is a lens having a predetermined geometric shape which preferably makes the rain sensor resistant to the build up of debris on the outer surface as well as being effectively self-cleaning. Within a housing of the rain sensor, at least one light emitter and at least one light detector are each deployed on a substantially planar circuit board facing such outer lens surface. So arranged, light rays from the at least one emitter strike the outer lens surface and is reflected about 90°, whereupon it strikes the outer lens surface once more and is again reflected therefrom about 90° to focus back onto the at least one detector. Raindrops present on the outside surface of the sensor affect the intensity of the light rays reflected and signals from the at least one light detector are sent to control circuitry within the rain sensor. A microprocessor in the sensor processes the resulting data to detect rain intensity over a wide range so as to be capable of being effectively deployed for applications such as to emulate a tipping bucket style rain detector, providing condensation sensing, and automatically adjusting the strength of the light rays emitted by the at least one light emitter to provide improved consistency of operation of the sensor over time.
Abstract:
A computerized system for mapping an atmospheric phenomenon in a geographic region. Multiple free-space electromagnetic communications links are previously distributed in the geographic region. The system includes an interface to monitoring mechanisms attached respectively to the free-space electromagnetic communications links. The monitoring mechanisms respectively monitor attenuation levels of the free-space electromagnetic communications links. A processor simultaneously processes the attenuation levels, and maps in the geographic region the atmospheric phenomenon. The simultaneous processing preferably applies a non-linear model which relates the attenuation levels the atmospheric phenomenon, and solves a tomographic problem based on the non-linear model and the attenuation levels. The tomographic problem is preferably solved by an interactive algorithm based on consecutive refinement and linear inversion at each iteration. Alternatively, an interpolation is performed based on respective inverse distance from the communications links. Preferably, the interpolation is further based on respective lengths of communications links. A data interface preferably provides to subscribers temporal information related to the atmospheric phenomenon within portions of the geographic region.
Abstract:
A precipitation static sensor includes a bottom flexible dielectric layer (e.g., a layer of urethane tape) configured to be attached to a wing or other external surface of an aircraft, a flexible conductive layer (e.g., a layer of aluminum tape) formed over a portion of the first flexible dielectric layer, and a conductor (such as a twisted-pair wire) coupled to the flexible conductive layer. A top flexible dielectric layer is formed over a portion of the bottom dielectric layer and a portion of the flexible conductive layer, thus forming an exposed detector region. In accordance with a further embodiment, multiple such precipitation static sensors are used and coupled to a meter device (e.g., a picoammeter), which may also be coupled to a data acquisition and display for providing a visual indication of the charge accumulated by the precipitation static sensors.
Abstract:
Disclosed is an in situ design for a runoff rain gauge 14 comprising an elevated storage pan 18 for storing precipitation above grade, a splitter pan 28 for partitioning the split of flow from storage to runoff and infiltration, a saturation cup 40 for measuring surface saturation of the infiltration resistance medium and a saturation cap 42 and splitter balance line 38 for communicating water levels in the saturation cup 40 to the splitter pan 28.
Abstract:
A system and method are disclosed for forecasting probability of precipitation values and most probable precipitation amount values for, preferably, three hour time period increments starting from the present hour through approximately hour 96 (i.e., four days) or beyond. The values are recalculated at the beginning of each hour, based upon existing forecasting information and meteorological data. The values are communicated to end users through a communications channel such as the Internet.
Abstract:
An apparatus for gathering weather related information is disclosed, in particular wind related information and rain related information, along with associated methods of using the apparatus. The apparatus may calculate at least one of a wind speed, a wind direction, and a rainfall amounts. The apparatus may include a controller, a sensor, and a communication member.
Abstract:
A self-dumping rain gauge including a collection container with value indications for gauging rainfall amounts is disclosed. The methodology discovers an apparatus comprising a rain collection container with a top hole, a replaceable rain collection cap containing a rain collection chamber and a plug with channels, a bottom hole, and a siphoning tube located within the rain collection container. The siphoning tube, including an open first end that protrudes through the bottom hole; a curved midpoint, or alternatively an intersecting midpoint, located near the top of the container; and a second end that is within the rain collection container, permits the rain collection container to be self-dumping. A flat surface, with easy to read numbers directly correlating to value indications (e.g., graduation marks, horizontal lines), is attached to the rain collection container to provide a method for gauging amounts of rainfall.
Abstract:
Disclosed is a runoff rain gauge 100 which includes a collector tube 104, soil infiltration resistance medium 108, a runoff resistance flow element 113, a standard rain gauge 102, and runoff collection tube 114. Precipitation enters the collector tube 104 and is divided to flow into the infiltration medium 108 and runoff collection tube 114 via flow element 113. Total precipitation is read in standard rain gauge 102, runoff in tube 114, and soil infiltration in medium 108 is calculated by the difference between total precipitation and the runoff.
Abstract:
A magnetostrictive precipitation gage includes a catch tube having an upper opening configured to receive precipitation therein. A vertical magnetostrictive rod and corresponding magnetic float linearly displaceable thereon are used to determine the fluid level within the catch tube. More particularly, as the fluid level fluctuates in the catch tube, so will the vertical position of the float, which interacts magnetically with the magnetostrictive rod. Accordingly, the vertical position of the float may be detected to determine the fluid level within the catch tube, and calculations regarding precipitation may be performed.
Abstract:
A rain gauge includes a cylindrical rain holder having a float in the rain holder and a rainfall value indicator arranged so that as the float moves vertically in the rain holder a pointer moves circumferentially to indicate the amount of rainfall. A cover for the rain holder includes an opening that is less in area than the area of the surface of water in the rain holder, whereby the water level in the rain holder raises less than but in proportion to the rainfall. The pointer is on the float and the float is mounted to a vertical screw so as to rotate as it floats vertically, whereby the pointer points to lettering on the rain holder wall indicating the amount of rainfall. The pitch per inch of the screw is proportional to the ratio of the area of the surface of water in the rain holder to the area of the opening.