Radiometric Measuring Device Two-Wire Power Management
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Solution Overview
Problem
Radiometric measuring devices with scintillators and light detectors face high energy requirements and short component lifespan, particularly due to limited power availability in two-wire systems, leading to potential undersupply and reduced measurement accuracy.
Innovation Solution
Implementing a controller to periodically switch on and off the light detector and evaluation circuit, adjusting the on/off time ratio based on current count rate and available power, allowing energy collection during off periods and using energy stores to maintain operation without power-related undersupply, thereby reducing power consumption and extending component lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light detector and evaluation circuit are operated continuously, then measurement accuracy is maintained, but power consumption increases and component lifespan decreases
Solution Approach 1:
The patent implements periodic switching of the light detector and evaluation circuit between active and inactive states. The controller activates these components only during measurement phases and deactivates them during energy storage phases, creating a periodic operation pattern that reduces average power consumption while maintaining measurement functionality when needed.
Solution Approach 2:
The system dynamically adapts its operation mode based on available energy. The controller monitors energy availability and adjusts the duty cycle of the light detector and evaluation circuit accordingly, making the system flexible and adaptive to varying power conditions while balancing measurement needs with power constraints.
2Use of energy by moving object
If the light detector and evaluation circuit are switched off periodically to save energy, then power consumption decreases, but measurement continuity is affected
Solution Approach 1:
The system performs preliminary energy storage in the energy storage element before switching off the light detector and evaluation circuit. This ensures that sufficient energy is accumulated in advance to sustain the system during inactive periods, allowing measurements to resume quickly when energy is available without interrupting the overall measurement process.
Solution Approach 2:
The controller continuously monitors the energy level in the energy storage element and uses this feedback to determine when to switch the light detector and evaluation circuit on or off. This closed-loop control ensures that measurements are performed only when sufficient energy is available, maintaining measurement continuity while optimizing power consumption.
3Productivity
If the light detector operates at high count rates, then measurement speed increases, but power consumption increases and component lifespan decreases
Solution Approach 1:
The system uses periodic activation of the light detector synchronized with the radioactive radiation source's emission pattern. By activating the detector only during expected radiation events rather than continuously, the system achieves high measurement speed when needed while reducing cumulative operating time and power consumption, thereby extending component lifespan.
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 approach reduces power consumption, ensures continuous operation within minimum available power, and extends the service life of components by minimizing power usage during high pulse rates and maintaining measurement accuracy.
Implementation Method 1
a gamma quantum (or other radioactive radiation) passing through the filling material from a radioactive source generates a light pulse in the scintillator
Implementation Method 2
This light pulse is then converted into electrical pulses using a photomultiplier (PMT), an avalanche photodiode (APD) or a silicon photomultiplier (SiPM)
Data Source
Figure 1
AI summary
Radiometric measuring device with a scintillator and a light detector, as well as a switch arrangement that periodically switches the light detector and the evaluation circuit on and off. When switched off, energy can be stored and used to operate the light detector and the evaluation circuit. This enables the measuring device to be connected to a 4...20mA 2-wire loop.