Optical Concentration Measuring Device Power Control
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Solution Overview
Problem
Optical concentration measuring devices face a trade-off between extending the lifespan of the light source, improving power saving performance, and maintaining measurement precision and responsiveness, as pulsed driving of the light source can lead to decreased signal-to-noise ratio (SNR) and reduced responsiveness.
Innovation Solution
The device includes a light source, a light detection part, a smoothing filter, a signal change amount calculation part, and a light source control part that adjust power supplied to the light source and filter characteristics based on calculated change amounts, optimizing power usage and filter settings to enhance power saving and lifespan while preserving measurement quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source is driven continuously to maintain high measurement precision and responsiveness, then measurement quality is improved, but power consumption increases and lifespan decreases
Solution Approach 1:
The light source is driven in a pulsed manner rather than continuously. The driving circuit supplies driving voltage to the light source in periodic pulses, allowing the light source to emit light only during pulse periods. This periodic operation reduces average power consumption while maintaining sufficient light emission for measurement during active periods.
Solution Approach 2:
The system dynamically adjusts the pulse width of the driving voltage based on the resistance value of the light source. The control part determines a predetermined pulse width that varies according to the light source resistance, optimizing the balance between measurement precision and power consumption under different operating conditions.
2Duration of action of stationary object
If the light source is driven in pulses to save power and extend lifespan, then power saving performance is improved, but signal-to-noise ratio and responsiveness deteriorate
Solution Approach 1:
The system measures the resistance value of the light source and uses this feedback to dynamically adjust the pulse width of the driving voltage. This feedback mechanism ensures that the pulse width is optimized for each light source's actual state, maintaining sufficient light emission intensity during pulses to preserve signal-to-noise ratio while still achieving power savings through pulsed operation.
Solution Approach 2:
The system changes the pulse width parameter based on the light source resistance value. By adjusting this temporal parameter dynamically, the system adapts the light emission characteristics to maintain reliable signal quality during pulsed operation, compensating for the reduced duty cycle effects.
3Measurement precision
If the pulse width is increased to improve measurement precision, then signal quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically changes the pulse width parameter based on the light source resistance value rather than using a fixed pulse width. This allows optimization of the pulse width to achieve sufficient signal quality for measurement while minimizing the duration of light emission, thereby reducing overall power consumption and energy loss.
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 improves power saving performance and extends the lifespan of the light source while minimizing degradation in measurement precision and responsiveness, maintaining effective SNR and responsiveness.
Implementation Method 1
a light source that emits an amount of light corresponding to a power to be supplied
Implementation Method 2
a light detection part that receives at least a part of the light emitted by the light source and generates a first signal corresponding to an amount of received light
Data Source
AI summary
An optical concentration measuring device capable of power saving and lifespan extension of a light source is provided, including a light source emitting an amount of light corresponding to a supplied power; a light detection part receiving at least a part of the light emitted by the light source and generating a signal corresponding an amount of received light as an output signal; a smoothing filter smoothing a signal based on the output signal; a signal change amount calculation part calculating a first and a second change amounts corresponding to a change amount between at least two selected acquisition values selected from acquisition values based on the output signal at current or past time; a light source control part controlling the power supplied to the light source based on the first change amount; and a filter control part controlling characteristics of the smoothing filter based on the second change amount.