Multi-Frequency Prospecting Signal Transmission Without Harmonics

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Solution Overview

Problem

Current electrical prospecting transmitters produce signals with rich harmonic components, leading to electromagnetic coupling interference and reduced signal-to-noise ratios, which affect the quality and accuracy of observation data.

Innovation Solution

A transmission device comprising a single-chip microcontroller, FPGA, DAC module, isolation amplifier circuit, differential amplifier module, digital power amplifier circuit, and sensor module, which generates multi-frequency equal-amplitude non-harmonic electrical prospecting signals by combining sine waves of multiple frequencies and amplifying them without harmonic components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rectangular wave signal is used for electrical prospecting, then the signal can be transmitted and received, but electromagnetic coupling interference occurs and signal-to-noise ratio decreases due to rich harmonic components

Engineering Contradiction:

Improvesignal qualityVSAvoidelectromagnetic coupling interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts only the fundamental wave component from the rectangular wave signal using a band-pass filter, removing the harmful harmonic components while retaining the useful fundamental frequency for prospecting measurements

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the signal waveform from rectangular wave to sine wave by filtering out harmonics, transforming the frequency spectrum parameters to eliminate electromagnetic coupling interference while maintaining the fundamental frequency for effective prospecting

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If rectangular wave signal with multiple harmonics is transmitted, then multi-frequency measurement can be achieved, but harmonic pollution affects observation accuracy

Engineering Contradiction:

Improvemulti-frequency measurement capabilityVSAvoidobservation accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the frequency spectrum by using multiple rectangular wave signals with different fundamental frequencies, each filtered to contain only its fundamental component, thereby achieving multi-frequency measurement without harmonic pollution

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the harmful harmonic components into beneficial separated frequency components by filtering each rectangular wave to retain only its fundamental frequency, transforming potential interference into useful multi-frequency measurement signals

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Ease of operation

If transition rectangular wave signal is used to control bridge inverter switches, then the transmitter can operate, but high-order harmonic components form electromagnetic coupling peaks at the receiving end

Engineering Contradiction:

Improvetransmitter operationVSAvoidharmonic pollution

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent extracts only the fundamental wave component from the transition rectangular wave signal using a band-pass filter, removing the harmful high-order harmonic components that cause electromagnetic coupling peaks while retaining the useful fundamental frequency for operation

Inventive Principle:

Principle #2Taking out (Extraction)

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 solution effectively suppresses electromagnetic coupling interference, improves signal-to-noise ratios, and enhances the quality of observation data by producing signals with equal amplitude main frequencies and no harmonic components.

Implementation Method 1

a digital to analog conversion (DAC) module; the DAC module is configured to convert the digital signal to an analog signal

Methodology Applied

Scientific EffectDigital-to-analog conversion:

Implementation Method 2

an isolation amplifier circuit; the signal source is isolated and amplified through the isolation amplifier circuit

Methodology Applied

Scientific EffectElectrical isolation:

Implementation Method 3

a differential amplifier module; the differential amplifier module is configured to adjust a voltage range of the signal source

Methodology Applied

Scientific EffectVoltage amplification:

Implementation Method 4

a digital power amplifier circuit; the signal source is subjected to power amplification through a digital power amplifier circuit

Methodology Applied

Scientific EffectPower amplification:

Data Source

PatentUS20250067896A1Transmission device and method for multi-frequency equal-amplitude non-harmonic electrical prospecting signal

Publication Date: 2025.02.27 HUNAN UNIV OF SCI & TECH

AI summary

A transmission device for multi-frequency equal-amplitude non-harmonic electrical prospecting signal includes a single-chip microcontroller, a field programmable gate array (FPGA), a digital to analog conversion (DAC) module, an isolation amplifier circuit, a differential amplifier module, a digital power amplifier circuit, and a sensor module connected successively. A plurality of output ends of the digital power amplifier circuit is in cascade connection with a grounding electrode A and a grounding electrode B to form a loop with ground. An input end of the sensor module is connected with the digital power amplifier circuit. An output end of the sensor module is connected with the single-chip microcontroller.