Moisture sensor based on standing wave ratio for agriculture industry

Manatrinon, Supatra; Chantaweesomboon, Witsarawat; Chinrungrueng, Jatuporn; Kaemarungsi, Kamol

doi:10.1109/ictemsys.2016.7467121

Cited by 5 publications

(2 citation statements)

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“…The minimum points at the standing wave pattern are spaced half a wavelength apart and positioned midway between the maxima. The primary goal of the measurements described in this test method is to determine the standing wave ratio at the specimen's face, also known as the Standing Wave Ratio (SWR) (Manatrinon et al, 2016;Yan et al, 2018;Wang & Zhao, 2010). This must be accomplished indirectly by extrapolating the maximum and minimum microphone voltages measured in the tube.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Potential of Innovation on Rice Straw Fluff (RSF) in Roofing System

Ismail¹,

Omar²

2023

ARCEE

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The metal deck is a building material used on the roof of the house for protection. While rice straw is a plant that forms after the rice is harvested. Rice straws will usually be burned by rice farmers to produce fertile soil; however, this will encourage open burning which can destroy the sustainability of the environment which needs to be avoided. However, there are also many types of metal decks, including metal decks with Polyurethane foam (PU Foam) which are considered good sound absorbers and contain a mixture of chemicals that may be harmful. The existence of Rice Straw Fluff is expected to help those who are less able to get metal decks that are as good as metal decks with Polyurethane foam (PU Foam). Several tests were conducted to detect whether the products produced exceed the effectiveness and can work well. The first test is the Impedance Tube Method which is a method to detect and evaluate the efficient sound frequency level. By using this method, Rice Straw Fluff is tested, and the results and data taken are good and effective if used by consumers. The next test is the Fourier Transform Infrared Spectroscopy Method (FTIR) which is a method to detect the chemicals contained in Rice Straw Fluff and existing products. The result of this finding clearly shows that rice straw mixed with silicone rubber is alkaline in nature which is influenced by silicone rubber. While Polyurethane foam (PU Foam) is acidic which is influenced by the chemicals mixed to produce foam. Finally, Rice Straw Fluff is an innovative product that can maintain the sustainability of the environment and can help low-income users to get a metal deck that has the same uses and benefits as existing products.

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Section: Resultsmentioning

confidence: 99%

Exploring the Potential of Innovation on Rice Straw Fluff (RSF) in Roofing System

Ismail¹,

Omar²

2023

ARCEE

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“…Gaskin and Miller proposed the use of the SWR to measure soil water content based on electromagnetic wave theory [11,18]. On this basis, scholars have further studied soil water content measurement based on the SWR principle and developed related sensors [4,[19][20][21][22]. SWR sensors provide fast, accurate, automated measurements with a fast dynamic response for volumetric water content measurements in many types of soil and are widely used in long-term monitoring processes in soil water networks owing to their low cost, ease of use, and low power consumption.…”

Section: Introductionmentioning

confidence: 99%

A Novel Portable Soil Water Sensor Based on Temperature Compensation

Tian

Xie

et al. 2022

Journal of Sensors

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Soil water sensors based on the standing wave rate (SWR) principle are affected by temperature in long-term operation. To address this problem, a temperature compensation model based on the binary regression analysis method is proposed. The measurement results of the temperature-compensated standing wave rate (TCSWR) sensor at different temperatures and soil volumetric water content are analyzed, and the least-squares principle is used to identify the parameters to be determined in the compensation model for temperature for the SWR soil water sensor. A portable tapered TCSWR sensor with built-in temperature compensation model was developed on this basis. The calibration results show that the standing wave measurement circuit of the TCSWR sensor can effectively respond to changes in soil water, and the coefficient of the fitted equation exceeds 0.95. A comparison of the results before and after temperature compensation proves that compensation can significantly reduce the measurement error of the TCSWR sensor and improve the measurement accuracy. The static and dynamic characteristics of the TCSWR sensor show that the measurement range of the TCSWR sensor is7.50%-31.50%, the measurement accuracy is ±0.63%, the stability is good, the resolution is a minimum of 0.05%, and the dynamic response time is less than 1 s. The absolute error of the TCSWR sensor measurement is less than 1% in comparison with similar sensors, demonstrating that the measurement results of the TCSWR sensor are reliable.

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