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Comparison between Different Types of Sensors Used in the Real Operational Environment Based on Optical Scanning

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Summary

Blue LEDs and phototransistors are effective photosensors for optical scanning systems, even in sunlight. Digital filtering significantly improves accuracy and resolution, reducing standard deviation to near zero.

Keywords:
light dependent resistor (LDR)light emitting diode (LED-receiver)optical scanning system (OSS)photodiodereal environment

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Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Optical Systems

Background:

  • Photosensors are crucial components in optical systems, but performance can be affected by ambient light conditions like sunlight.
  • Traditional photosensors may struggle in environments with high levels of solar or artificial light.
  • Selecting appropriate photosensors is key to ensuring reliable operation of optical scanning systems.

Purpose of the Study:

  • To evaluate the performance of various photosensors (IRLED, photodiode, LDR, blue LED, phototransistor) in controlled and real-world environments.
  • To identify photosensors suitable for optical scanning systems operating under adverse conditions, including sunlight.
  • To assess the impact of digital filtering on improving photosensor accuracy and resolution.

Main Methods:

  • Experiments were conducted in both controlled and real-world settings.
  • Multiple photosensor types were tested, including infrared light-emitting diodes (IRLEDs), photodiodes, light-dependent resistors (LDRs), blue LEDs, and phototransistors.
  • Digital filters were applied to the output signals of selected photosensors to analyze their effect on data stability.

Main Results:

  • Blue LEDs and phototransistors demonstrated lower sensitivity to sunlight, making them suitable for optical scanning systems.
  • These devices also served effectively as stable reference sources.
  • Digital filtering dramatically reduced the standard deviation of sensor output, e.g., from 100.26 to 0.15 for phototransistors and 86.08 to 0.11 for blue LEDs.

Conclusions:

  • Blue LEDs and phototransistors are viable, cost-effective photosensors for optical scanning systems, particularly in challenging lighting.
  • The integration of digital filtering is essential for enhancing the resolution and accuracy of these systems.
  • This approach offers a pathway to reduced system costs with improved performance metrics.