Single Laser Receiver for Multi-Beam Self-Mix Interferometry
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Solution Overview
Problem
Conventional audio microphones capture desired audio signals along with background noise and interference, making it challenging to isolate clean audio signals effectively.
Innovation Solution
The use of multiple lasers or laser beams in conjunction with a single laser drive component and receiver, forming an optical or laser microphone, which enhances self-mix techniques and reduces manufacturing costs and device size by utilizing a single receiver instead of multiple separate receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate laser receivers are used for multiple laser beams, then measurement precision and reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple laser receivers into a single integrated receiver that can process optical signals from multiple laser beams simultaneously. This merging approach maintains the measurement precision benefits of having multiple receivers while reducing device complexity and manufacturing cost by eliminating the need for multiple separate receiver components.
Solution Approach 2:
The single laser receiver is designed with multi-functional capability to handle optical signals from multiple different laser beams. This universal receiver performs the functions of what would traditionally require multiple specialized receivers, thereby simplifying the overall system architecture while maintaining audio signal capture accuracy across multiple laser channels.
2Object-affected harmful factors
If multiple separate laser receivers are used, then noise filtering capability is improved, but manufacturing cost and device size increase
Solution Approach 1:
The patent merges multiple noise-filtering receiver functions into a single integrated laser receiver unit. This unified receiver maintains the noise filtering and interference rejection capabilities that would be achieved with multiple separate receivers, while significantly reducing manufacturing cost and simplifying device assembly by requiring only one receiver component instead of multiple separate units.
3Device complexity
If a single laser receiver is used for multiple laser beams, then device complexity and cost are reduced, but measurement precision may deteriorate
Solution Approach 1:
The single laser receiver is engineered with universal multi-functional capabilities to accurately process optical signals from multiple different laser beams simultaneously. This design ensures that measurement precision and audio signal capture accuracy are maintained despite using only one receiver component, as the receiver is specifically designed to handle multiple input channels with high fidelity.
Solution Approach 2:
The patent employs parameter changes in the receiver design, such as adjustable sensitivity settings and frequency response characteristics, to optimize the single receiver's performance across multiple laser beam inputs. By dynamically adjusting receiver parameters, the system maintains high measurement precision for each laser channel while using a single receiver unit.
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 approach improves the efficiency and accuracy of audio signal capture by filtering and cleaning noise, reducing the form factor and cost of the microphone device while maintaining effective noise reduction.
Implementation Method 1
Each one of said plurality of laser transmitters has a different, respective, self-mix carrier frequency
Implementation Method 2
optical feedback of said first laser transmitter, and optical feedback of said second laser transmitter
Implementation Method 3
a first monitor photodiode to receive a first optical signal from said first laser transmitter, and to output a first electric signal
Data Source
AI summary
A laser-based device or sensor includes: a first laser transmitter having a first self-mix carrier frequency; a second laser transmitter having a second, different, self-mix carrier frequency; a first monitor photodiode to receive a first optical signal from the first laser transmitter, and to output a first electric signal; a second monitor photodiode to receive a first optical signal from the second laser transmitter, and to output a second electric signal; an electric connection to connect together the first electric signal and the second electric signal, forming a combined electric signal; a single laser receiver to receive the combined electric signal and to generate from it a spectrum that corresponds to both (i) self-mix signal of the first laser transmitter, and (ii) self-mix signal of the second laser transmitter. Alternatively, a single monitor photodiode is used, receiving self-mix signals from multiple laser transmitters, and outputting a single electric signal to a single laser receiver.