DDS Signal Source Circuit for Field Rock Impedance Measurement
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Solution Overview
Problem
Existing spectral induced polarization measuring instruments for rock and ore samples require external signal generators, are not suitable for outdoor measurements, and lack constant-voltage and constant-current capabilities in the frequency domain, posing challenges for precise impedance measurement in harsh environments.
Innovation Solution
A circuit and apparatus integrating a DDS signal generator on a circuit board, connected to a smart mobile device, with a sample rack and electrode interfaces, enabling portable, multi-gear constant-voltage and constant-current signal generation, and featuring a compact, durable design for field measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external signal generator is used for impedance measurement, then the instrument can perform frequency domain measurements, but the instrument becomes unsuitable for outdoor measurements and requires a 220 V inverter
Solution Approach 1:
The patent integrates the signal generator functionality directly into the impedance analyzer by incorporating a DDS (Direct Digital Synthesis) chip and associated circuitry. This merging of functions eliminates the need for external signal generators and power inverters, enabling the instrument to operate autonomously in outdoor field conditions while maintaining frequency domain measurement capabilities.
Solution Approach 2:
The instrument is designed to perform multiple functions including signal generation, impedance measurement, and power conversion within a single integrated unit. The DDS-based signal generator can operate across a wide frequency range (10^-2 to 10^2 Hz), and the instrument can function as both a constant voltage and constant current source, making it universally applicable for various geophysical measurement scenarios in the field.
2Adaptability or versatility
If a constant-voltage and constant-current measuring instrument in time domain is used, then the instrument can measure impedance, but there are no constant-voltage and constant-current measuring products in frequency domain
Solution Approach 1:
The patent implements dynamic switching between constant voltage and constant current modes using a DDS-based signal generation system. The system can dynamically adjust its operation mode based on measurement requirements, transitioning between voltage-controlled and current-controlled impedance measurement modes. This dynamic capability enables the instrument to adapt to different measurement scenarios in the frequency domain, providing both constant-voltage and constant-current measurement capabilities.
Data Source
AI summary
The present disclosure provides a circuit and apparatus for generating a signal source for impedance measurement of rock and ore samples, including a smart mobile device; an integrated instrument, where the integrated instrument is connected to the smart mobile device via a wireless network, and a first electrode interface, a second electrode interface, a third electrode interface and a fourth electrode interface are fixedly arranged on the integrated instrument; and a sample rack, where the sample rack includes a first unpolarized electrode, a second unpolarized electrode, a third unpolarized electrode, and a fourth unpolarized electrode, rock and ore samples are placed between the second unpolarized electrode and the third unpolarized electrode, and a first end of the first unpolarized electrode is electrically connected to the first electrode interface by a triaxial cable.