Tunable Interference Filter Oscillation Center Detection
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Solution Overview
Problem
Spectroscopic measurement apparatuses using wavelength tunable interference filters face long measurement periods due to the need to wait for oscillations to stop before measuring light levels, which reduces measurement efficiency.
Innovation Solution
A spectroscopic measurement apparatus that includes a wavelength tunable interference filter with a gap value changer, a detection unit, and a measurement controller that acquires light levels during oscillation, allowing for the determination of a target light level based on the oscillation center without waiting for the oscillation to stop, by analyzing the transition of light levels and natural oscillation cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement waits for oscillation to stop before measuring light level, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The patent applies preliminary action by acquiring light level data during the oscillation period before the oscillation stops. The measurement controller collects multiple light level values at different time points during oscillation, then calculates the average light level corresponding to the oscillation center position. This eliminates the need to wait for oscillation to stop, thereby reducing measurement time while maintaining precision through statistical processing of multiple samples.
Solution Approach 2:
The patent uses feedback by continuously monitoring the light level changes during oscillation and using this information to determine the oscillation center position. The measurement controller acquires light level data throughout the oscillation process, analyzes the transition characteristics, and uses this feedback to calculate the average light level at the oscillation center, enabling quick and accurate measurement without waiting for oscillation to cease.
2Length of moving object
If the gap value changer applies voltage to bend the second substrate, then the inter-reflection-film gap is adjusted, but oscillation is induced
Solution Approach 1:
The patent applies dynamics by intentionally utilizing the oscillation that occurs when voltage is applied to bend the second substrate. Instead of trying to eliminate the oscillation, the measurement controller is designed to acquire light level data during the oscillation period and calculate the average light level corresponding to the oscillation center position. This dynamic approach converts the instability into a measurable phenomenon that can be processed to obtain accurate results.
Solution Approach 2:
The patent uses parameter changes by varying the timing of light level acquisitions during oscillation and using the natural oscillation cycle characteristics to determine the oscillation center position. The measurement controller changes the measurement parameters (acquisition timing, number of samples) to adapt to the oscillating state, enabling accurate measurement despite the dynamic gap changes.
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
Enables quick measurement of spectral characteristics by determining the target light level during the oscillation period, improving measurement precision and reducing overall measurement time.
Implementation Method 1
a gap value changer that changes a gap value of the inter-reflection-film gap by applying a voltage to bend the second substrate toward the first substrate
Implementation Method 2
stress produced by the gap value changer and an elastic force produced by the second substrate act on the second substrate
Implementation Method 3
a wavelength tunable interference filter that includes a pair of reflection films facing each other and picks up light of a predetermined wavelength from light under measurement by changing the distance between the reflection films
Implementation Method 4
a detection unit that detects a light level of light picked up by the wavelength tunable interference filter
Data Source
AI summary
A spectroscopic measurement apparatus includes: a wavelength tunable interference filter including a fixed substrate having a fixed reflection film, a movable substrate having a movable reflection film, and an electrostatic actuator that changes a gap value of an inter-reflection-film gap by applying a voltage to bend the movable substrate; a detector that detects a light level; and a controller that measures a spectral characteristic of light under measurement. The controller includes a filter driver that applies a drive voltage to the electrostatic actuator to change the inter-reflection-film gap, a detected light level acquisition unit that acquires light levels detected by the detector, and a target light level acquisition unit that acquires a light level corresponding to an oscillation center of the movable substrate as a target light level based on how the detected light level transitions and a natural oscillation cycle that the movable substrate has.