Moisture Sensor Dual-Band Frequency Segmentation
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Solution Overview
Problem
Conventional moisture sensors employing frequency domain refractometry (FDR) require long measurement times and high power consumption, making them unsuitable for battery-driven devices like mobile terminals and IoT devices.
Innovation Solution
A detection device with a first and second probe, a measurement unit, and a calculation unit that measures and calculates medium characteristics in both a first and second frequency band, allowing for mode switching to reduce measurement time and power consumption while maintaining accurate water content measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the moisture sensor sweeps over a wide frequency band to measure water content accurately, then measurement precision is improved, but measurement time increases and power consumption increases
Solution Approach 1:
The frequency band is segmented into a first frequency band (e.g., 0.8GHz to 2GHz) and a second frequency band (e.g., 2GHz to 12GHz). The measurement unit measures electromagnetic waves in both bands, using the first band for accurate water content measurement and the second band for rapid additional measurements, thereby reducing overall measurement time while maintaining precision
Solution Approach 2:
The system performs measurements in two frequency bands, where the second band extends beyond the traditionally necessary first band. This partial excessive action allows the system to capture sufficient measurement data in the first band for accuracy while using the second band to accelerate the measurement process, reducing total measurement time
2Measurement precision
If the moisture sensor sweeps over a wide frequency band to measure water content accurately, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The frequency band is segmented into a first frequency band (e.g., 0.8GHz to 2GHz) and a second frequency band (e.g., 2GHz to 12GHz). The measurement unit measures electromagnetic waves in both bands, using the first band for accurate water content measurement and the second band for rapid additional measurements, thereby reducing overall measurement time and power consumption while maintaining precision
Solution Approach 2:
The system performs measurements in two frequency bands, where the second band extends beyond the traditionally necessary first band. This partial excessive action allows the system to capture sufficient measurement data in the first band for accuracy while using the second band to accelerate the measurement process, reducing total power consumption
3Productivity
If the measurement time is reduced by narrowing the frequency band, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The frequency band is segmented into a first frequency band (e.g., 0.8GHz to 2GHz) and a second frequency band (e.g., 2GHz to 12GHz). The measurement unit measures electromagnetic waves in both bands, using the first band for accurate water content measurement and the second band for rapid additional measurements, thereby reducing overall measurement time while maintaining precision
Solution Approach 2:
The system performs measurements in two frequency bands, where the second band extends beyond the traditionally necessary first band. This partial excessive action allows the system to capture sufficient measurement data in the first band for accuracy while using the second band to accelerate the measurement process, reducing total measurement time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves reduced measurement time and power consumption while maintaining accurate water content measurement, enabling efficient operation in battery-driven devices.
Implementation Method 1
an electromagnetic wave is transmitted along a metal probe buried in a medium, and the water content in the medium is calculated from the relative permittivity measured on the basis of the reflection response of the electromagnetic wave
Implementation Method 2
the water content in the medium is calculated from the relative permittivity measured on the basis of the reflection response of the electromagnetic wave
Data Source
AI summary
An inspection device and method suppressing measurement time and power consumption. A detection device according to the present disclosure includes a first probe with a first antenna unit for transmission, a second probe with a second antenna unit for reception, the second probe being opposed to the first probe at a predetermined distance, a measurement unit that measures a measurement signal including a propagation characteristic of an electromagnetic wave in a medium between the first and second antenna units, and a calculation unit that calculates characteristics information of the medium based on the measurement signal. In a first mode, the measurement unit measures the measurement signal in a first frequency band for the electromagnetic wave propagating in the medium, and in a second mode, the measurement unit measures the measurement signal in a second frequency band, which is a part of the first frequency band for the electromagnetic wave.