Dual-Laser Projector Polarization Control for Stable Beam Intensity
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Solution Overview
Problem
Existing laser projection devices lack the ability to maintain consistent laser beam intensity and continuous operation in case of diode failure, and do not allow for dynamic adjustment of intensity for enhanced visibility and safety.
Innovation Solution
A device utilizing two laser diodes with perpendicular linear polarizations combined by a polarization combiner, with an intensity-measuring arrangement and control unit to adjust and maintain beam intensity, ensuring continuous operation and dynamic intensity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single laser diode is used for projection, then the device structure is simple, but the operation is interrupted when the laser diode fails or performance degrades
Solution Approach 1:
The patent combines two laser diodes with different wavelengths (red and green) into a single projection system. Both laser diodes are coupled to a common beam combining element that merges their beams into a single combined beam for projection, enabling continuous operation even if one diode fails.
Solution Approach 2:
The laser source is segmented into two independent laser diodes (red and green wavelengths) that can operate separately. Each diode can be independently controlled and monitored, allowing the system to maintain operation with one diode if the other fails or requires maintenance.
2Adaptability or versatility
If laser diode intensity is fixed, then the device structure is simple, but the projection intensity cannot be adjusted for different applications or safety requirements
Solution Approach 1:
The system implements dynamic intensity control by independently adjusting the drive currents of the red and green laser diodes. The control unit can vary the intensity of each diode based on application requirements, safety considerations, or detected performance degradation, enabling flexible adaptation to different projection needs.
Solution Approach 2:
The patent changes the operational parameters (drive currents) of the laser diodes to control output intensity. By adjusting the current supplied to each diode, the system can optimize projection brightness, respond to safety requirements, or compensate for aging effects without mechanical adjustments.
3Reliability
If one laser diode fails, then the other diode can compensate, but the system requires complex monitoring and control mechanisms
Solution Approach 1:
The system incorporates feedback mechanisms where the control unit monitors the performance and intensity of each laser diode. Based on this feedback, the control unit automatically adjusts the drive currents to maintain optimal combined beam intensity, detect failures, and enable seamless switching or compensation when one diode underperforms or fails.
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
Ensures consistent laser beam intensity and continuous operation even with diode failure, and allows for dynamic intensity adjustments for improved visibility and safety in industrial applications.
Implementation Method 1
The beams of the laser diodes are each linearly polarized, with the polarization axes or directions being in pairs perpendicular to one another. A polarization combiner is also provided, which combines the incident beams of the laser diodes into a combined beam with circular or elliptical polarization.
Data Source
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AI summary
Device (10) for laser projection comprising: • two laser diodes (12, 14) of the same wavelength, whose beam is linearly (20, 28) polarized and whose polarization axes are perpendicular to each other, • a polarization combiner (24) which combines the beams of the laser diodes (12, 14) into a combined beam (26) with circular or elliptical polarization, • a measuring arrangement (25) which measures an intensity of the combined laser beam (26) and • a control unit to which the measured intensity of the combined laser beam is applied as an input signal and which sets an intensity of at least one of the laser diodes.