Optical Module Spectroscopic Control Timing Optimization
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Solution Overview
Problem
Existing spectroscopic imaging apparatuses face increased measurement time due to inefficient timing coordination between the spectroscopic element and the rolling shutter-type imaging element, leading to invalid frames and reduced precision in light exposure detection.
Innovation Solution
The optical module includes a spectroscopic element that changes wavelength at the end of the photodetection period of the final pixel block, ensuring accurate light exposure and reducing measurement time by preventing consecutive invalid frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the spectroscopic element is driven without taking the drive timing for a photodetector element into consideration, then the device complexity is reduced, but the measurement precision deteriorates due to invalid frames
Solution Approach 1:
The control unit performs preliminary action by determining the photodetection period end timing before actually driving the spectroscopic element. This allows the system to pre-calculate when the imaging element finishes capturing a frame, ensuring the spectroscopic element is driven at the optimal moment to avoid invalid frames while maintaining coordinated control.
Solution Approach 2:
The system implements feedback by continuously monitoring the drive timing of the imaging element and adjusting the spectroscopic element driving timing accordingly. The control unit uses the photodetection period end timing information to dynamically determine when to drive the spectroscopic element, creating a closed-loop control system that maintains synchronization between the two components.
2Reliability
If the light shielding period is set to be much longer than the changing operation, then the reliability is improved, but the measurement time increases
Solution Approach 1:
The system changes the parameter of light shielding period duration based on the actual photodetection period end timing. Instead of using a fixed, overly long light shielding period, the control unit dynamically adjusts the timing to match the actual requirements of the imaging element, reducing unnecessary waiting time while maintaining sufficient reliability for the spectroscopic element to complete its wavelength changing operation.
3Loss of time
If the spectroscopic element starts wavelength change driving at the end of photodetection period of final pixel block, then the measurement time is reduced, but the device complexity increases due to precise timing control
Solution Approach 1:
The control unit performs preliminary calculation of the photodetection period end timing before driving the spectroscopic element. By pre-determining when the imaging element finishes capturing the final pixel block, the system can schedule the spectroscopic element driving at the optimal moment without requiring complex real-time synchronization mechanisms during execution.
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 reduces measurement time by optimizing the timing of wavelength change driving, ensuring valid frames and maintaining high measurement accuracy without unnecessary delays.
Implementation Method 1
a spectroscopic element that selects light of a predetermined wavelength from incident light
Implementation Method 2
a roll shutter-type imaging element that has pixels which accumulates electric charges while being exposed to the emitted light
Data Source
AI summary
A spectrometry apparatus includes a wavelength variable interference filter emitting light of various predetermined wavelengths; a roll shutter imaging element having pixels accumulating electric charges when exposed to light, and forming one frame by photodetection for each pixel block including pixels with a predetermined time delay for each pixel block, in which the imaging element accumulates electric charges in a photodetection period, and outputs a detection signal in response to the accumulated electric charges in a non-photodetection period; and a spectroscopic controller controlling the wavelength change driving of the emitted light of the wavelength variable interference filter. For the one frame, the spectroscopic controller starts the wavelength change driving at an end timing of the photodetection period of a final pixel block for which the photodetection process is performed at the end.