Lidar Optical Amplifier Segmentation for Long-Range Precision
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Solution Overview
Problem
Current lidar systems face challenges in efficiently amplifying and transmitting pulsed laser signals over long distances while maintaining signal quality, particularly in scattering environments, which affects the accuracy and range of distance measurements.
Innovation Solution
A lidar system comprising a seed laser, optical preamplifier, and optical booster amplifier, along with an optical link to a sensor head, which amplifies and scans pulses of light across a field of regard, enabling effective detection of scattered light from distant targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical amplifiers are used to amplify pulsed laser signals for long-distance transmission, then the transmission distance and signal quality are improved, but the device complexity increases
Solution Approach 1:
The optical amplification system is divided into two separate amplifiers: an optical preamplifier located at the light source and an optical booster amplifier located at the sensor head. This segmentation allows each amplifier to be optimized for its specific function and location, improving overall system performance while managing complexity through modular design
Solution Approach 2:
An optical fiber link serves as an intermediary to convey the amplified pulses from the light source to the sensor head. This intermediary enables long-distance transmission while isolating the complex amplification electronics from the remote sensor location
2Measurement precision
If high peak power pulses are transmitted to maintain signal quality over distance, then measurement precision is improved, but energy loss increases
Solution Approach 1:
The optical preamplifier performs preliminary amplification of the laser pulses at the light source before transmission. This preliminary action ensures that the pulses have sufficient power to withstand long-distance transmission through the optical fiber with minimal energy loss, while maintaining the peak power necessary for precise distance measurements
Solution Approach 2:
The system uses parameter changes in the optical amplification process, transforming low-power seed pulses into high-peak-power amplified pulses suitable for long-distance transmission. The amplifiers modify the power parameters of the light pulses to achieve the required signal quality over extended distances
3Reliability
If optical amplifiers are placed at the sensor head to amplify received pulses, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The amplification function is segmented between two locations: the optical preamplifier at the light source and the optical booster amplifier at the sensor head. Each segment performs a specific amplification task, with the booster amplifier providing final signal enhancement at the detection point, improving signal-to-noise ratio while distributing complexity across modular components
Solution Approach 2:
The system replaces electronic signal processing with optical amplification. By using optical amplifiers to directly amplify the light signals in the optical domain rather than converting to electrical signals for processing, the system improves signal-to-noise ratio while avoiding the complexity of electro-optic conversion and electronic amplification circuits
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 enhances the accuracy and range of distance measurements by amplifying and transmitting pulsed laser signals effectively, improving the signal-to-noise ratio and enabling precise scanning and detection of targets over extended distances.
Implementation Method 1
an optical preamplifier configured to amplify the pulses of light to produce amplified pulses of light
Implementation Method 2
an optical booster amplifier configured to receive the portion of the amplified pulses of light and amplify the received pulses of light to produce amplified output pulses of light
Implementation Method 3
a scanner configured to scan the amplified output pulses of light across a field of regard
Implementation Method 4
a receiver configured to detect at least a portion of the scanned pulses of light scattered by a target
Data Source
AI summary
A lidar system comprising with a light source, an optical link, and a sensor head. The light source can include a seed laser to produce pulses of light and an optical preamplifier to amplify the pulses of light. The optical link can convey amplified pulses of light to the sensor head remotely located from the light source. The sensor head can include an optical booster amplifier, a scanner to scan amplified output pulses of light across a field of regard, and a receiver to detect pulses of light scattered by a target located a distance from the sensor head.