InGaAs Photodetector Array for Laser Pulse Detection
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Solution Overview
Problem
Conventional laser designation systems face limitations in accurately detecting and decoding pulsed laser signals, particularly in terms of spatial resolution and noise interference.
Innovation Solution
A laser designator pulse detector utilizing an InGaAs photodetector and a Read Out Integrated Circuit (ROIC) configured to convert and condition laser signals, along with a two-dimensional array of photodetectors and a filter assembly, enables improved detection, tracking, and decoding of pulsed laser codes with enhanced signal-to-noise ratio and high spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional photodetectors are used for laser detection, then the system structure is simple, but the detection precision and spatial resolution are insufficient
Solution Approach 1:
The patent divides the detection system into multiple independent photodetector elements arranged in a two-dimensional array, where each element independently detects laser signals from different spatial positions. This segmentation enables high spatial resolution by providing discrete detection points across the laser beam profile, directly improving measurement precision without requiring a single complex detector.
Solution Approach 2:
The patent transitions from conventional one-dimensional or point-based photodetectors to a two-dimensional array of photodetector elements. This dimensional expansion allows simultaneous detection of laser signals across multiple spatial coordinates, dramatically improving spatial resolution and enabling precise beam profiling while maintaining relatively simple individual detector elements.
2Reliability
If conventional detection methods are used, then the system is easy to operate, but the signal-to-noise ratio is poor
Solution Approach 1:
The patent combines multiple photodetector elements into a unified two-dimensional array that simultaneously processes signals from various spatial positions. By merging the detection capabilities of multiple elements and processing their outputs collectively, the system achieves improved signal-to-noise ratio through spatial diversity and signal integration, while the automated array processing maintains operational simplicity.
Solution Approach 2:
The patent implements signal processing feedback mechanisms where the outputs from multiple photodetector elements are continuously monitored and processed to enhance signal detection. The system uses the combined information from all array elements to distinguish true laser signals from noise, improving reliability through collective signal validation while maintaining ease of operation through automated processing algorithms.
3Measurement precision
If traditional laser spot tracking is used, then the device complexity is low, but the tracking precision for multiple laser spots is insufficient
Solution Approach 1:
The patent segments the laser detection task by assigning individual photodetector elements to detect specific spatial positions and laser spots. Each element independently tracks laser signals from its designated region, enabling precise multi-spot tracking through distributed detection. This segmentation allows the system to simultaneously monitor multiple laser spots with high precision without requiring a single complex tracking mechanism.
Solution Approach 2:
The patent employs a two-dimensional photodetector array that provides spatial mapping capabilities across the laser beam profile. This dimensional expansion enables simultaneous tracking of multiple laser spots at different positions by utilizing the x-y coordinate information from the array, achieving high tracking precision for multiple spots while keeping individual detector elements simple.
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 solution allows for accurate detection and decoding of multiple laser spots with significantly improved spatial resolution, overcoming the limitations of traditional systems by providing a robust and precise method for laser pulse tracking and decoding.
Implementation Method 1
An Indium Gallium Arsenide (InGaAs) photodetector configured to convert laser signals into electrical signals
Data Source
AI summary
A laser designator pulse detector includes an InGaAs photodetector configured to convert laser signals into electrical signals. A Read Out Integrated Circuit (ROIC) is operatively connected to the InGaAs photodetector to condition electrical signals from the InGaAs photodetector. The ROIC can be operatively connected to a peripheral device including one or more modules configured to process signals from the ROIC and provide pulse detection, decoding, and tracking. In another aspect, a laser designator pulse detector includes a two-dimensional array of photodetectors configured to convert laser signals into electrical signals. A ROTC as described above is operatively connected to the two-dimensional array of photodetectors.