Laser Power Calibration via Feedback Averaging
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Solution Overview
Problem
Laser radars and 3D imaging technologies based on time of flight (TOF) face deviations in laser power due to temperature variations, process deviations, and power source voltage fluctuations, affecting their ability to implement precise ranging functions.
Innovation Solution
A laser power calibration method and system that continuously receives feedback on the output power from the transmitter end, compares it to a predefined power, and adjusts it to an average value when deviations exceed a set range, using a processor and communication interface to control the output power and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmitter end operates under varying temperature, process deviations, and power source voltage conditions, then the device can adapt to different environmental conditions, but the laser output power deviates from the predefined value
Solution Approach 1:
The patent implements a feedback mechanism where the actual laser output power is continuously monitored and compared with the predefined power value. The difference is calculated and used to generate a compensation value that adjusts the drive current, thereby correcting power deviations caused by temperature, process, and voltage variations.
Solution Approach 2:
The patent dynamically adjusts the drive current parameter based on the calculated power deviation. By changing the drive current in response to detected power variations, the system compensates for environmental influences and maintains accurate laser output power.
2Stability of the object's composition
If the laser power is continuously adjusted to compensate for PVT variations, then the output power stability is improved, but the system complexity increases
Solution Approach 1:
The system performs self-calibration by automatically detecting its own power deviations and generating appropriate compensation signals. The calibration process is autonomous, requiring minimal external intervention while maintaining stable output power through continuous self-adjustment.
Solution Approach 2:
The patent performs power calibration before actual ranging operations to establish accurate baseline parameters. This preliminary calibration ensures that the transmitter end is properly configured before use, reducing the need for frequent adjustments during operation.
Data Source
AI summary
A laser power calibration method includes: receiving a first power fed back by a transmitter end; comparing a difference of the first power against a second power predefined at the transmitter end; and when the difference exceeds a predefined range, controlling an output power of the transmitter end to be a third power, wherein the third power is an average power of the first power and the second power.