ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Evapotranspiration SensorOutlineReference listTo explore furtherMajor applicationsBasic Working PrincipalSlide 7Typical Sample ConfigurationMajor SpecificationsSlide 10Type of SoilPrecipitationPower IssuesAccuracySlide 15MemoryTemperature RangeLimitationsSlide 19Slide 20ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: Evapotranspiration SensorPrepared by: Oscar DelgadoDept. of Electrical and Computer Engineering Utah State UniversityE: [email protected] F: (435)797-3054 (ECE Dept.)3/7/20093/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To probe further–Major applications–Basic working principle illustrated–Sample configuration in application–Major specifications–Limitations–Purchase Information01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference list•www.hunterindustries.com/resources/PDFs/Owners_Manuals/Domestic/lit399w.pdf .•www.gri.msstate.edu/research/nasa_rpc/review_apr_08/AnnGNPS_Project_April1408_MRCReview3_RLB_2008.04.15.ppt•www.findasensor.com/display_category.php?id=1&idc=5 - 115k•campbellsci.com/documents/lit/b_et107.pdf3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To explore further •Lance Yarbrough (PI), Dath Mita (Co-PI), The University of Mississippi, Evaluation for the Integration of a Virtual Evapotranspiration Sensor Based on VIIRS and Passive Microwave Sensors into Annualized Agricultural Non-Point Source Pollution (AnnAGNPS) Model, 2006.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major applications •Evapotranspiration sensor can capture how much water the plants have lost, or consumed, due to local atmospheric conditions.•This can result in a new, water-efficient irrigation program every water day, based on local weather conditions.•Evapotranspiration sensors (ET) can be used in agricultural weather stations, and can be customized by station (or “zone”) for specific plant, soil, and sprinkler types.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Basic Working Principal• The ET Sensor measures solar radiation, air temperature, and relative humidity, and calculates the daily Evapotranspiration factor (ET) for the irrigation zones.http://www.hunterindustries.com/resources/PDFs/Owners_Manuals/Domestic/lit399w.pdfFig. No. 13/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Basic Working Principal•This represents the amount of water lost by the plants due to local climatic conditions, which needs to be replaced by irrigation. This unit is usually placed 6.5 feet (2 meters) above ground.http://campbellsci.com/documents/lit/b_et107.pdfFig. No. 23/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Typical Sample Configuration•ET is a useful sensor for application on irrigation and agricultural systems. •It uses 4 sensors: solar radiation, air temperature, and relative humidity. Also includes a Rain Gauge, which measures rainfall in either hundredths of an inch, or in millimeters. •It uses a Non-volatile memory replaceable 10-year lithium battery CR2032 (for time/date backup only).3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Major Specifications•Like any other sensor, ET specifications depends on the application or purpose, in general which subsensor specifications are as follows: 1-) Type of soil and precipitation were the sensor will be used. 2-) The runtime of the system (how much the sensor will be used per day, week, month). (power usage). 3-) Accuracy 4-) Memory3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Major Specifications 5-) Temperature Range 6-) Sensitivityhttp://campbellsci.com/documents/lit/b_et107.pdfCS305-ETMTE525-ETEnclosure housingCR1000M, battery,and modemWindSonic1-ETMHMP50-ETFig. No. 33/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Type of Soil •Generally ET can be used on any type of soil. Soil type (or texture) is used to determine the Intake Rate of the soil, resulting in cycle and soak scheduling, and could be configured for the following soil types: •Sand: Predominantly Sandy soil Silt: Predominantly silt soil•Silty Clay Clay Loam•Clay: Predominantly clay soil•Loamy Sand•Sandy Loam•Loam: Predominantly loamy soil3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Precipitation•The Precipitation Rate is specified in inches or millimeters per hour. The longer a ET sensor runs, the more inches or millimeters it adds to the root zone of the plants. ET determines how many inches or millimeters were lost and based on that information how long the station needs to run to replace the lost could be calculated.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Power Issues•Li-Poly and Li-Ion are the batteries established for the batteries on sensors. The battery used by the ET sensor is a 10 year lithium CR2032 (for time/date backup only). The battery is recharged via an 24VAC/5VDC, 50/60 Hz AC transformer or a 10-W solar panel.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14Accuracy•The accuracy on sensors is a very important specification and its refer as the difference between the measured value and the true value. In the ET sensor the accuracy depends on the other’s probes and gauge accuracy: - Air temperature Probe (HMP50-ET Fig. 3): ±0.8°C -Relative Humidity Probe: ±3%, 0 to 90% range; ±5%, 90 to 98% range.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Accuracy-Rain Gage (TE525-ET Fig. 3): ±1% accuracy @ 2" per hr (50.8 mm per hr) or less-Pyranometer (CS305-ETM Fig. 3): ±5% for daily total radiation. -Wind Direction Accuracy (034B-ETM Fig. 3): ±4°-Wind Speed Accuracy: ±0.11 m s-1 when less than 10.1 m s-1; ±1.1% of true when greater than 10.1 m s-1-Wind Direction Accuracy: ±4°.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-16Memory• The memory required by the ET sensor is 2 Mbytes Flash for operating
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