Lidar Receiver Polarization Splitting for Reflective Target Protection
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Solution Overview
Problem
Current lidar devices face irreversible damage and decreased measurement accuracy due to high-intensity reflected light from oriented reflective targets and interference from particulate matters like dust and water mist, which complicates precise distance measurement.
Innovation Solution
A high-speed laser distance measuring device employing a polarizer and polarizing beamsplitter to differentiate between light reflections from oriented reflective targets and target objects, using separate photoelectric receiving tubes with different sensitivities to filter out high-intensity signals and particulate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one photoelectric device is used to receive both light from reflective targets and target objects, then the device structure is simple, but the receiver suffers irreversible damage from high-intensity reflected light and measurement accuracy decreases
Solution Approach 1:
The receiving device is segmented into two separate photoelectric receiving devices: a first receiving device for receiving light reflected by oriented reflective targets, and a second receiving device for receiving light reflected by target objects. This segmentation allows each device to be optimized for its specific function, preventing damage from high-intensity reflected light while maintaining measurement accuracy.
Solution Approach 2:
Different photoelectric receiving devices are assigned different sensitivity characteristics according to their specific receiving tasks. The first receiving device has higher sensitivity for detecting weak reflected light from reflective targets, while the second receiving device has appropriate sensitivity for target objects, optimizing performance for each local function.
2Productivity
If conventional lidar technology is used, then the basic measurement function is achieved, but particulate matters such as dust and water mist cannot be identified and interfere with measurement results
Solution Approach 1:
The system dynamically switches between different receiving devices based on the type of reflected light detected. When light from oriented reflective targets is detected, the first receiving device is activated; when light from target objects is detected, the second receiving device is activated. This dynamic adaptation allows the system to maintain high measurement precision in environments with particulate matters.
Solution Approach 2:
The system changes the sensitivity parameter of the receiving device according to the type of light being received. By adjusting which receiving device is active based on the polarization characteristics and intensity of the incoming light, the system optimizes measurement precision for different environmental conditions including the presence of dust and water mist.
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 solution prevents damage to the receiver and enhances measurement accuracy by effectively separating and processing light signals from reflective targets and objects, while filtering out environmental interference, resulting in a simple and precise distance measurement system.
Implementation Method 1
the light emitting tube emits an outgoing light beam to the polarizer, and after passing through the polarizer, the outgoing light beam forms an outgoing polarized light beam
Implementation Method 2
after being filtered by the optical filter, the reflected polarized light beam is transmitted into the polarizing beamsplitter, and is split by the polarizing beamsplitter into a first reflected polarized light beam and a second reflected polarized light beam
Implementation Method 3
the receiving tube set includes a first receiving tube and a second receiving tube; the first reflected polarized light beam passes through the polarizing beamsplitter and is transmitted into the first receiving tube; and the second reflected polarized light beam is reflected by the polarizing beamsplitter and transmitted into the second receiving tube
Data Source
AI summary
A high-speed laser distance measuring device is described that includes an emitting part and a receiving part. The emitting part can include a polarizer (2) arranged between a light emitting tube (1) and a reflective mirror (3); the receiving part can further include a polarizing beamsplitter (7) arranged between the optical filter (6) and the receiving tube set. The light emitting tube (1) can emit an outgoing light beam to the polarizer (2), and the outgoing light beam can form an outgoing polarized light beam and is transmitted into the reflective mirror (3). After being reflected by the reflective mirror (3) and passing through the transmitting objective lens (4), the outgoing polarized light beam can be transmitted onto a target object. After being reflected by the target object, the outgoing polarized light beam can form a reflected polarized light beam, which passes through the receiving objective lens set (5) and is transmitted to the optical filter (6). After being filtered, the reflected polarized light beam is transmitted into the polarizing beamsplitter (7), and is split into a first reflected polarized light beam and a second reflected polarized light beam, which are transmitted into the first receiving tube (8), and the second receiving tube (9) respectively. The high-speed laser distance measuring device can identify the light formed by the reflection of an oriented reflective target and a target object, and can adopt different receiving means for receiving them. Simultaneously, it can effectively filter the interference caused by particulate matter in the test environment to the test.