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LiDAR and Ranging
Principle of LiDAR
The basic principle of LiDAR is to calculate distance by emitting a laser beam and measuring the time it takes for the beam to be reflected back. A LiDAR system typically includes a laser transmitter (TX), a receiver (RX), a processor, and scanning components. The laser transmitter emits a laser beam, which is reflected off a target object and received by the receiver. The processor calculates the distance based on the time difference between emission and reception.
Specific Ranging Methods
Triangulation Method: Calculates distance based on the change in position of the reflected light. This method offers high accuracy but is suitable for shorter distances, often used in robot navigation and industrial inspection.
Direct Time-of-Flight Method (DTOF): Calculates distance by measuring the time difference between laser emission and reception. This method provides fast response speed and high detection accuracy, making it suitable for long-distance measurements such as autonomous driving and environmental mapping.
Frequency-Modulated Continuous Wave Method (FMCW): Calculates distance by modulating the frequency of the light wave and measuring the phase difference of the reflected light. It offers fast data acquisition but can be affected by signal attenuation over long distances.
Indirect Time-of-Flight Method (iTOF): Calculates distance by measuring the phase shift between the emitted and reflected light. This method provides high accuracy at short to medium distances.
Application Areas
LiDAR technology is crucial in various fields, including:
Autonomous Driving: For environment detection and obstacle avoidance.
Topographic Mapping: For terrain measurement and map creation.
Robot Navigation: For precise navigation of robots.
Remote Sensing: For measurements in atmospheric and oceanic studies.
Lasers for LiDAR
CNI lasers for LiDAR are used in applications such as satellite ranging, topographic mapping, and autonomous driving. Common wavelengths include ultraviolet (266nm, 355nm), visible (532nm), and near-infrared (1064nm, 1535nm, 1573nm) bands.
Lasers for LiDAR must operate reliably under harsh conditions, including wide temperature ranges (-20°C to 55°C), low pressure, and vibration, ensuring long-term thermal and mechanical stability.
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Integrated Illumination and Ranging LiDAR Systems | Satellite Laser Ranging LiDAR |
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Autonomous Driving LiDAR | Topographic Mapping LiDAR |
Changchun New Industries Optoelectronics Technology Co., Ltd.
Address: No. 888 Jinhu Road, High-Tech Zone, Changchun, 130103, P.R.China
International Tel:+86-431-85603799
Email: sales@cnilaser.com
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