| CPC G01L 13/00 (2013.01) [G01L 19/086 (2013.01); G01L 19/12 (2013.01); G01L 27/002 (2013.01); G08B 21/082 (2013.01); G08B 21/086 (2013.01)] | 13 Claims |
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1. A method for detecting an entry of an object into a pool, comprising the following steps:
providing at least one underwater sensor enclosure having at least one pressure sensor, the underwater sensor enclosures positionable beneath a surface of the pool, wherein the at least one pressure sensor of the at least one underwater sensor enclosure measures a summation of water pressure and barometric pressure;
providing at least one above ground sensor enclosure having at least one pressure sensor, the above ground sensor enclosure positionable above the surface of the pool, wherein the at least one pressure sensor of the at least one above ground sensor enclosure measures barometric pressure;
providing a receiver having a processing unit, the receiver communicably connected to each of the at least one pressure sensors of the at least one underwater sensor enclosure and of the at least one above ground sensor enclosure, respectively, wherein the receiver collects pressure sensor data from the at least one pressure sensor of the at least one underwater sensor enclosure and from the at least one pressure sensor of the at least one above ground sensor enclosure;
positioning the at least one underwater sensor enclosure beneath a surface of the pool;
positioning the at least one above ground sensor enclosure above the surface of the pool;
measuring a summation of water pressure and barometric pressure with the pressure sensor of the at least one underwater sensor enclosure, wherein the pressure data from the pressure sensors within each enclosure is collected contemporaneously within less than 8 seconds;
measuring barometric pressure with the pressure sensor of the at least one above ground sensor enclosure;
receiving, in a processing unit within the receiver, data from each of the at least one pressure sensors of the at least one underwater sensor enclosure and of the at least one above ground sensor enclosure, respectively;
collecting pressure sensor data from the at least one pressure sensor of the at least one underwater sensor enclosure and from the at least one pressure sensor of the at least one above ground sensor enclosure;
defining a set of pressure data tranches in the processing unit to comprise: the underwater member data tranches having data collected from the at least one pressure sensors of the at least one underwater pressure sensor enclosure, and an above ground member data tranche having data collected from the at least one pressure sensor of the at least one above ground pressure sensor enclosures, whereby the data from the underwater member data tranches and above water data tranches were collected contemporaneously within less than 16 seconds,
wherein the processing unit performs a data processing method having the steps of:
calculating an average underwater pressure from the underwater member data tranches of the set;
calculating an average above ground pressure from the above ground member data tranches of the set;
calculating a differential pressure by subtracting the average above ground pressure from the average underwater pressure;
calculating a first moving average differential pressure to determine the average differential pressure over a time period;
calculating a second moving average differential pressure at a time gap before the first moving average is determined;
calculating a change in moving average differential pressure by subtracting the second moving average differential pressure from the first moving average differential pressure;
calculating a mass of an entrant object by multiplying a calibration factor by the change in moving average differential pressure; and
alerting a user of the mass of the entrant object, whereby a positive mass represents water entry and a negative mass represents water exit.
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