High-Voltage X-Ray Generator Temperature Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods fail to maintain stable output of electronic radiation sources, such as x-ray tubes, in high-temperature environments like oil and gas well logging, leading to inefficiencies and potential failures due to temperature-induced variations in capacitance and generator efficiency.
Innovation Solution
A control mechanism for high-voltage generators includes a voltage feedback loop, environmental temperature monitoring, and a control processor to adjust driving frequency and pulse-train, ensuring optimal efficiency and stability by characterizing temperature effects and making real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If x-ray tube output is monitored and input voltage is modified to correct output variations, then output stability is improved, but the correction occurs after data is already affected by voltage changes
Solution Approach 1:
The patent implements preliminary action by monitoring the input voltage to the x-ray tube and proactively adjusting it before output variations occur. The system characterizes temperature effects on generator efficiency and modifies driving signals in advance to maintain optimal input parameters, preventing output variations before they affect measurement data.
2Productivity
If logging speed is increased to improve productivity, then fewer photons enter detectors at any depth, but data resolution and repeatability deteriorate
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the input voltage and driving frequency parameters of the x-ray generator based on temperature conditions. This allows the system to maintain optimal photon output across varying temperatures, enabling faster logging speeds while preserving sufficient photon counts for accurate density measurements with 0.01 g/cc repeatability.
3Temperature
If capacitor capacitance reduces with temperature increase, then multiplier efficiency increases due to frequency mismatch, but output voltage reduces and thermal runaway occurs
Solution Approach 1:
The patent implements feedback by continuously monitoring the output voltage of the voltage multiplier and using this information to adjust the input driving frequency and pulse-train parameters. The control processor characterizes temperature effects on generator efficiency and modifies driving signals in real-time to maintain optimal input parameters, preventing thermal runaway and output instability.
Solution Approach 2:
The patent applies dynamics by making the driving frequency and pulse-train parameters adjustable and adaptive rather than fixed. The system dynamically modifies these parameters based on real-time temperature and output voltage conditions, allowing the generator to maintain optimal efficiency across varying thermal environments.
4Duration of action of stationary object
If 137Cs isotope activity decreases over time due to half-life, then gamma-ray output reduces, but replacement requires well closure and complex disposal procedures
Solution Approach 1:
The patent applies mechanics substitution by replacing the radioactive 137Cs isotope source with an electronic x-ray tube powered by a temperature-compensated high-voltage generator. This substitution eliminates the need for periodic isotope replacement and disposal while providing controllable and stable x-ray output for density logging measurements.
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
This solution maintains stable output voltage and efficiency of electronic radiation sources across varying temperatures, achieving statistical repeatability comparable to chemical sources and enabling high-speed logging without compromising data accuracy.
Implementation Method 1
A resistor-based feedback loop may be implemented such that the output potential of the multiplier can be monitored
Implementation Method 2
at least one environmental temperature monitor
Implementation Method 3
using a control mechanism to modify an associated driving frequency, and using a control mechanism to modify an associated driving pulse-train, such that the change in properties of the electronic components of the generator as a result of changes in environmental temperature are characterized
Data Source
AI summary
A control mechanism for a high-voltage generator for supplying voltage and current to an electronic radiation source in high-temperature environments is provided, the control mechanism including at least one voltage feedback loop for monitoring the output of the generator; at least one environmental temperature monitor; a control bus; and at least one control processor. A method of controlling a high-voltage generator that powers an electronic radiation source in high-temperature environments is also provided, the method including at least: measuring the output voltage of the generator; measuring the temperature within the generator's environment, using a control mechanism to modify a driving frequency, and using a control mechanism to modify a driving pulse-train, such that changes in properties of the electronic components of the generator as a result of changes in environmental temperature are characterized and the generator's driving signals modified to maintain optimally efficient input parameters for a specific environmental temperature.