Light Detector Delay Setting Module for SPAD Timing Accuracy
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Solution Overview
Problem
Existing light detectors using SPAD arrays face challenges in accurately detecting light reception intensity due to variations in the timing of pulse signal outputs from individual SPADs, leading to measurement errors and reduced detection accuracy.
Innovation Solution
A light detector configuration that includes a light receiving array, a comparison module, a response acquisition module, and a delay setting module, where the delay setting module adjusts the time interval for acquiring the response number by setting a delay value, ensuring accurate timing for pulse signal output and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the time interval for acquiring response number is fixed, then the device structure is simple, but measurement accuracy deteriorates due to variations in pulse signal timing
Solution Approach 1:
The patent implements a delay setting module that dynamically adjusts the delay time based on the actual timing of received light signals. This allows the time interval for acquiring response number to be optimized for each measurement, improving accuracy while maintaining a relatively simple device structure through parameter adjustment rather than structural complexity
Solution Approach 2:
The patent changes the delay time parameter according to the timing characteristics of received light signals. By adjusting this parameter, the system optimizes the measurement window to capture the appropriate number of pulse signals, thereby improving measurement accuracy without requiring complex structural modifications
2Measurement precision
If the delay time is adjusted to capture more pulse signals, then measurement accuracy improves, but the time interval increases reducing productivity
Solution Approach 1:
The delay time is dynamically adjusted based on the actual timing of light signal reception rather than using a fixed conservative value. This allows the system to use the minimum necessary time interval for accurate measurement, thereby improving measurement speed while maintaining accuracy
Solution Approach 2:
The system optimizes the delay time parameter for each measurement based on the characteristics of the received light signals. This parameter optimization ensures that the measurement window is neither too short (missing signals) nor too long (unnecessary delay), achieving a balance between accuracy and productivity
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
The proposed configuration enhances the detection accuracy of light reception intensity by allowing for appropriate adjustment of the time interval for acquiring the response number, thereby reducing measurement errors and improving the overall accuracy of light detection.
Implementation Method 1
SPAD, which is an abbreviation of Single Photon Avalanche Diode, is an avalanche photodiode that operates in Geiger mode and can detect the incidence of a single photon
Data Source
AI summary
A light detector is provided to include a light receiving array having a plurality of light receivers respectively outputting pulse signals upon incidence of photons. A delay setting value is set which is used to adjust a time interval from when the pulse signals are output from the light receiving array to when a response number, which is a specified number of the light receivers outputting the pulse signals, is acquired.