LED Temperature Compensation via Periodic Calibration
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Solution Overview
Problem
Existing gas detection systems using light-emitting diodes face challenges in maintaining constant optical power across varying temperatures, leading to increased energy consumption and signal-noise ratio degradation.
Innovation Solution
A detection system employing a light-emitting diode powered by a constant voltage source, with a measurement resistor to monitor current changes, and processing means using temperature calibration parameters to adjust output signals, ensuring low energy consumption and maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous current adjustment is used to compensate for temperature effects, then detection accuracy is maintained, but energy consumption increases
Solution Approach 1:
The system uses periodic temperature calibration cycles instead of continuous current adjustment. The microcontroller periodically updates temperature calibration parameters based on measured temperature, allowing the LED to operate at constant current without continuous compensation, thereby reducing energy consumption while maintaining detection accuracy between calibration cycles.
Solution Approach 2:
The patent replaces the electrical control mechanism (continuous current adjustment) with a computational approach using temperature calibration parameters stored in memory. The microcontroller calculates compensation based on stored parameters rather than continuously adjusting current, substituting mechanical/electrical control with information processing to reduce energy consumption.
2Measurement precision
If temperature calibration parameters are stored in memory, then temperature compensation is achieved, but device complexity increases
Solution Approach 1:
Temperature calibration parameters are pre-calculated and stored in the microcontroller's memory before actual operation. This preliminary preparation allows the system to perform simple lookups and calculations during operation rather than performing complex real-time temperature compensation, thereby achieving accurate compensation without increasing operational device complexity.
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 system effectively compensates for temperature effects while minimizing energy consumption and preserving signal-noise ratio, enabling accurate gas concentration measurements.
Implementation Method 1
an emitter comprising a light-emitting diode DEL able to emit a luminous signal
Implementation Method 2
a light-emitting diode DEL able to emit a luminous signal
Implementation Method 3
a receiver 2 which is distant with respect to the emitter 1 and comprising for example a photodiode (PHD) intended to sense the luminous signals emitted by the emitter 1
Data Source
AI summary
A detection system that includes an emitter, a power supply source, a receiver, a detector, and a processor. The emitter includes a light-emitting diode that emits a luminous signal. The power supply source applies a constant voltage to the light-emitting diode. The receiver senses the luminous signal emitted by the light-emitting diode and generates a first input signal representative of the luminous signal detected. The detector measures the current passing through the light-emitting diode and generates a second input signal representative of the current measured. The processor is connected to the receiver and provides an output signal as a function of the first input signal and of the second input signal.