Variable Wavelength Interference Filter Voltage Inversion
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Solution Overview
Problem
Variable wavelength interference filters face challenges in prompt spectral measurement due to overshoot and free damped vibrations when switching voltage from high to low, leading to delayed gap spacing stabilization and measurement inaccuracies.
Innovation Solution
An optical filter configuration with a voltage control system that switches the electrical potential difference from a first to a second value larger than the first, ensuring a stronger restoring force and preventing overshoot, allowing for more precise and rapid gap spacing stabilization and spectral measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If voltage is switched from high to low to change wavelength, then the gap spacing can be adjusted to a larger value, but it takes much time for the gap spacing to reach the desired value due to overshoot and free damped vibrations
Solution Approach 1:
The patent inverts the conventional voltage switching direction by switching from a first (lower) voltage to a second (higher) voltage instead of from high to low. This reversal prevents the electrostatic attractive force from becoming excessively strong, thereby avoiding overshoot and free damped vibrations of the substrates, and enabling the gap spacing to reach the desired value quickly without time loss.
2Length of moving object
If voltage is switched from high to low, then the gap spacing increases, but overshoot and free damped vibrations occur leading to measurement inaccuracies
Solution Approach 1:
By inverting the voltage switching direction from conventional high-to-low to low-to-high, the patent prevents the electrostatic attractive force from becoming excessively strong. This avoids substrate vibrations and overshoot that would cause gap spacing instability, thereby ensuring measurement precision without sacrificing gap spacing adjustment capability.
3Length of moving object
If voltage is switched from low to high, then the electrostatic attractive force increases to reduce gap spacing, but this causes stronger restoring force and longer vibration period
Solution Approach 1:
The patent applies partial action by switching voltage in a controlled manner from a first voltage to a second voltage, where the voltage increase is managed to achieve the desired gap spacing adjustment without excessively increasing the electrostatic attractive force. This prevents the restoring force from becoming too strong and the vibration period from extending, thus avoiding harmful oscillations while maintaining effective gap control.
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 configuration enables prompt and accurate spectral measurement by suppressing vibrations and ensuring stable gap spacing, thereby improving measurement precision and efficiency.
Implementation Method 1
an electrostatic attractive force F caused by the electrostatic drive electrodes is expressed by a function of the applied voltage and the distance (an opposed electrode distance) between the pair of electrostatic drive electrodes
Implementation Method 2
a variable wavelength interference filter provided with a pair of reflecting films disposed so as to be opposed to each other with a gap therebetween, and for dispersing the light with a desired wavelength from the incident light
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An optical filter (5) includes a first substrate (51), a second substrate (52) opposed to the first substrate, a first reflecting film (53) provided to the first substrate, a second reflecting film (54) provided to the second substrate, and opposed to the first reflecting film, a first electrode (551) provided to the first substrate, a second electrode (552) provided to the second substrate, and opposed to the first electrode, and a voltage control section adapted to control an electrical potential difference between the first electrode and a second electrode, and when switching a wavelength of a light beam to be dispersed by switching the electrical potential difference between the first electrode and the second electrode, and measuring an intensity of the light beam dispersed, the voltage control section switches the electrical potential difference from a first electrical potential difference to a second electrical potential difference larger than the first electrical potential difference.