Variable Wavelength Interference Filter Voltage Timing Control
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Solution Overview
Problem
Spectroscopic measurement devices using variable wavelength interference filters face increased measurement time due to the need to wait for vibrations to settle, especially when sequentially changing wavelengths, leading to prolonged measurement times.
Innovation Solution
A spectroscopic measurement device with a gap amount changing section that applies an analog voltage continuously to vary the inter-reflecting film gap, allowing for prompt detection of light intensity at the target wavelength by monitoring the applied voltage and using stored V-λ data to account for signal and vibration delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spectroscopic measurement device waits for the vibration of the thick-wall portion to settle before performing light intensity measurement, then the measurement accuracy is improved, but the measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-storing the relationship data between drive voltage values and corresponding wavelengths in a lookup table before measurement. This allows the system to directly retrieve the target wavelength information when a specific voltage is applied, eliminating the need to wait for vibration settlement while maintaining measurement accuracy through voltage-monitored timing.
Solution Approach 2:
The patent implements feedback by continuously monitoring the drive voltage applied to the variable wavelength interference filter and using this voltage information to determine the exact timing for light intensity measurement. The system retrieves pre-stored voltage-wavelength relationships and performs measurement at the precise moment when the filter reaches the desired wavelength, thereby eliminating idle waiting time while ensuring accurate measurement at the correct wavelength.
2Measurement precision
If the device sequentially changes the wavelength and waits for vibration settlement at each wavelength point, then the spectral measurement accuracy is improved, but the overall measurement time increases significantly
Solution Approach 1:
The patent applies continuity of useful action by eliminating the idle waiting periods between wavelength changes. The system continuously monitors the drive voltage and performs light intensity measurement immediately when the voltage corresponds to the desired wavelength, as determined from pre-stored relationships. This continuous operation without unnecessary delays significantly improves measurement throughput while maintaining spectral accuracy.
Solution Approach 2:
The patent uses preliminary action by pre-characterizing the variable wavelength interference filter and storing the complete voltage-wavelength relationship data before actual spectral measurement begins. This pre-processing allows the measurement phase to proceed efficiently by simply looking up and acting on the pre-determined voltage-wavelength correspondences, eliminating the need for time-consuming real-time characterization at each wavelength point.
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 prompt and accurate spectroscopic measurements by continuously varying the inter-reflecting film gap, reducing the need to wait for vibrations to settle and considering delays in the measurement process.
Implementation Method 1
since the electrostatic attractive force due to the application of the voltage and the elastic force of the thin-wall portion of the second substrate act on the thick-wall portion of the second substrate
Implementation Method 2
a variable wavelength interference filter having a pair of reflecting films opposed to each other and varying the distance between the reflecting films to thereby take out the light having a predetermined wavelength
Data Source
AI summary
A spectroscopic measurement device includes a variable wavelength interference filter provided with a first reflecting film, a second reflecting film, and an electrostatic actuator for changing a gap amount of a gap between the first reflecting film and the second reflecting film, a detection section adapted to detect the light intensity of the light taken out by the variable wavelength interference filter, a voltage setting section and a voltage control section for applying an analog voltage varying continuously to the electrostatic actuator, a voltage monitoring section for monitoring the voltage applied to the electrostatic actuator, a storage section for storing V-λ data, and a light intensity acquisition section for obtaining the light intensity detected by the detection section at a timing at which the light transmitted through the variable wavelength interference filter has the measurement target wavelength based on the voltage monitored by the voltage monitoring section.