BNCP-MJ(41)

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The BNCP-MJ 41 (Buried Nuclear Magnetic Resonance Permeameter – Multi-Frequency Joint measurement) Application Field and Working Principles are aimed at bringing forward decisive advances in the field of soil moisture measurement. This technology features a combination of nuclear magnetic resonance (NMR) and electromagnetic (EM) techniques. It enables efficient measurement of water content and moisture distribution in soil profiles. The BNCP-MJ 41 combines time-domain and frequency-domain techniques in order to accurately measure the electrical and thermal properties of soils in-situ, resulting in a significant improvement in accuracy and resolution of measurements.

The application field of BNCP-MJ 41 relies on a new principle of measurement called the joint-measurement technique. The basic idea of the BNCP-MJ 41 is to measure the electromagnetic response of the ground in the frequency domain, and then combine it with NMR measurements in the time domain. By combining these two techniques, the device is able to precisely measure the change in soil water content over both time and frequency domains. This increase in accuracy and resolution compared to traditional frequency domain devices is a major advantage of the BNCP-MJ 41.

Considering the working principle of the BNCP-MJ 41, the device is composed of two parts: the transmitter and receiver. The transmitter consists of a frequency-domain power supply (FPS) and a time-domain power source (TPS). The FPS produces two frequency sinusoidal signals that are sent to the ground. The TPS usually produces a dc voltage, and when a rise and fall current is applied, it is transformed into a radio frequency (RF) signal that is also sent to the ground. Through a suitable choice of the period and duty cycle of the sinusoidal voltage, the phase of the two waves in the soil can be controlled. This yields an effective joint measurement of the soil conductivity and permittivity, which in turn enables a determination of the soil moisture content.

The BNCP-MJ 41 receiver contains two channels, the electrical channel (E-Channel), which detects the frequency component of the signal, and the thermal channel (T-Channel), which detects the thermal component. The received signal is extended to two parallel power amplifiers, from which the amplitude, frequency and phase of the frequency component of the signal is extracted. This information is relayed to the base station, where it is analyzed for accuracy. The thermal channel extracts the thermal component of the signal, and passes it through a thermal converter module, which converts it into a proportional voltage. This voltage is then measured, and the obtained value contributes to the determination of the moisture content.

The BNCP-ME 41 application field and working principle are highly beneficial to soil moisture measurement. The use of nuclear magnetic resonance (NMR) and electromagnetic (EM) techniques in the joint measurement technique allow for an accurate determination of the electrical and thermal properties of soils in-situ, which significantly improves accuracy and resolution of measurements. The device is composed of two parts, a transmitter and receiver, which together extract amplitude, frequency and phase of the frequency component of the signal, and the thermal component from the T-Channel, converting it into a proportional voltage. The application field and working principle of the BNCP-ME 41 prove essential in soil moisture measurement.

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