Vibration Insulation Sensor Frequency Response Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vibration isolation systems using geophones face challenges in achieving linear sensitivity below 4 Hz due to significant sensitivity drop-off at low frequencies, leading to high noise levels and large, expensive analog components required for frequency response correction.
Innovation Solution
A hybrid frequency response correction method combining analog and digital amplification stages, where the signal is digitized and processed through a digital stage after an analog stage, allowing for reduced noise and component size while maintaining accuracy, with amplification focused below 4 Hz to enhance sensitivity linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog amplification is used to correct frequency response below 4 Hz, then sensitivity linearity is improved, but noise level increases significantly
Solution Approach 1:
The patent replaces the purely analog amplification system with a hybrid system that converts the sensor signal to digital form using an A/D converter. This substitution of analog processing with digital processing eliminates the noise amplification problem while maintaining the frequency response correction functionality through digital signal processing algorithms.
Solution Approach 2:
The patent changes the state of the signal from analog to digital domain. By converting the sensor signal to digital form before amplification, the system can apply frequency-dependent gain without introducing the high noise levels characteristic of analog amplification at low frequencies, thus improving the signal-to-noise ratio while maintaining sensitivity linearity.
2Measurement precision
If analog circuits are used for frequency response correction, then sensitivity correction is achieved, but component size and cost increase
Solution Approach 1:
The patent replaces complex analog circuitry with a digital signal processing approach. The A/D converter followed by digital amplification stages eliminates the need for large, expensive analog components while achieving the same frequency response correction. This reduces both the physical size and cost of the correction device.
Solution Approach 2:
The patent uses digital copying of the signal characteristics through software-based filtering and amplification algorithms. Instead of physical analog components, the system replicates the frequency response correction function digitally, which is more compact and cost-effective while maintaining the required precision.
3Measurement precision
If high amplification is applied at low frequencies, then sensitivity linearity is improved, but noise in sensor signal increases
Solution Approach 1:
The patent substitutes analog amplification with digital amplification after A/D conversion. This allows the system to apply high gain at low frequencies without amplifying the noise that would be introduced by analog circuitry. The digital domain processing maintains signal integrity while achieving the required sensitivity linearity.
Solution Approach 2:
The A/D converter acts as an intermediary between the analog sensor and the amplification stage. By converting the signal to digital form first, the system can then apply frequency-dependent amplification without the noise-generating analog components, thus mediating between the need for high low-frequency gain and the need to minimize noise.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The method involves producing analogous vibrations to represent sensor signals by a vibration signal sensor (100). The frequency-dependent sensor signals are amplified for adjusting a frequency-dependent sensitivity of the vibration signal sensor. An actuator control signal is produced by processing the amplified sensor signals. An actuator (400) is controlled with the actuator control signal to counteract the vibration. An independent claim is also included for an adjustment device for adjusting the frequency-dependent sensitivity of vibration signal sensor of a vibration insulation system.