Optoelectronic Sensor Noise Threshold Pulse Control
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Solution Overview
Problem
Optoelectronic sensors face detection errors due to noise radiation from external sources like fluorescent lamps and flash lamps, which can lead to false detections and increased measurement time, especially when the noise signal intensity exceeds the receiver's threshold, causing the sensor to either fail in detection or lead to energy wastage by emitting pulses that result in no useful data.
Innovation Solution
The method involves synchronizing the emitter and receiver to assess noise levels before each pulse emission, comparing the noise signal with a threshold, and delaying or blocking pulse emission if the noise is above the threshold, ensuring that pulses are only emitted when the noise level is acceptable, thereby reducing false positives and negatives and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the emitter continuously emits pulses to improve detection speed, then productivity increases, but energy consumption increases and overheating occurs
Solution Approach 1:
The emitter operates in periodic pulses rather than continuously, with active emission phases followed by idle phases. This periodic operation allows the system to maintain detection capability while reducing average energy consumption and preventing overheating, directly resolving the contradiction between productivity and energy use.
2Productivity
If the emitter increases pulse frequency to reduce measurement time, then productivity improves, but reliability deteriorates due to receiver overheating
Solution Approach 1:
The system dynamically adjusts the pulse frequency and timing based on thermal conditions and noise levels. The emitter incorporates thermal management that modulates the duty cycle, allowing higher frequencies when cooling and lower frequencies when thermal load is high, thus maintaining reliability while optimizing productivity.
3Reliability
If the receiver processes all incoming signals to improve detection coverage, then reliability improves, but measurement time increases due to noise filtering requirements
Solution Approach 1:
The system performs preliminary noise characterization during idle phases before actual measurement. By pre-assessing the noise environment and establishing baseline thresholds, the receiver can quickly filter relevant signals during the measurement phase without extensive post-processing, thus maintaining high detection coverage while reducing measurement time.
4Productivity
If the system emits pulses during high noise periods to maintain productivity, then productivity is maintained, but measurement precision deteriorates due to signal saturation
Solution Approach 1:
The system continuously monitors noise levels and uses this feedback to control pulse emission timing. When noise exceeds thresholds that would compromise measurement precision, the controller automatically delays or cancels pulse emission. This feedback mechanism maintains productivity by resuming operations as soon as conditions improve, while ensuring measurement accuracy is never compromised.
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 increases the reliability of object detection by ensuring that pulses are only emitted when noise levels are within a usable range, reducing false detections and energy wastage, while maintaining productivity by minimizing delays in measurement processes.
Implementation Method 1
an emitter (20) suitable for emitting a periodic electromagnetic radiation in the form of pulses
Implementation Method 2
a receiver (30) suitable for receiving the electromagnetic radiation emitted by the emitter (20) and converting it into an electric signal
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to a method for receiving a pulsed signal emitted by an emitter (2,20) in an optoelectronic sensor (1), the sensor including at least an emitter (2,20) for emitting electromagnetic radiation and a receiver (3, 30) for receiving electromagnetic radiation and wherein the electromagnetic radiation received is converted into an electric signal, said method including the steps of: o arranging said emitter to emit a pulsed electromagnetic radiation; o before the emission of a pulse, receiving an electromagnetic radiation received through said receiver (3, 30) by generating a noise signal (s r,S1,S2); o comparing an amplitude of said received noise signal (s r,S1) with a first threshold (V threshold); and o emitting said pulse if the amplitude of said received noise signal is below said first threshold, and not emitting said pulse otherwise. The invention also relates to an optoelectronic sensor.