Optical Sensor for Noise Flickering: Difference between revisions
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*Shrink Tubes | *Shrink Tubes | ||
*Wires | *Wires | ||
* | *Resistor/Variable resistor | ||
*LDR Photoresistor: GL5528 / GL5537 | *LDR Photoresistor: GL5528 / GL5537 | ||
*3V DC Power Supply | *3V DC Power Supply | ||
* | *Signal Generator | ||
===Experimental Set-up=== | ===Experimental Set-up=== | ||
====Circuit design concept==== | ====Circuit design concept==== | ||
The circuit consists of a simple potential divider, with a resistor and a photodiode. By exposing the photodiode to visual noise tags, such as the flickering of LEDs, the output voltage | The circuit consists of a simple potential divider, with a resistor and a photodiode. By exposing the photodiode to visual noise tags, such as the flickering of LEDs, the output voltage. The photodiode resistance is a function of light exposure. The resistance is reciprocally proportional to light intensity. The output can be observed on an oscilloscope to determine the performance of the photodiode. | ||
The | |||
====Variables==== | ====Variables==== | ||
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1. Wavelength of LED | 1. Wavelength of LED | ||
2. Resistor in circuit | 2. Resistor in circuit | ||
3. Frequency of blinking | 3. Frequency of blinking (1Hz - 100kHz) | ||
The dependent variables that will be measured are: | The dependent variables that will be measured are: | ||
Revision as of 11:21, 14 March 2024
Group Members
Eric Cheung; Lee An Min, Amanda; Loh Jia Ying Whitney
Summary
Set-Up
Equipment Needed
- Soldering Iron
- Soldering Tin
- Shrink Tubes
- Wires
- Resistor/Variable resistor
- LDR Photoresistor: GL5528 / GL5537
- 3V DC Power Supply
- Signal Generator
Experimental Set-up
Circuit design concept
The circuit consists of a simple potential divider, with a resistor and a photodiode. By exposing the photodiode to visual noise tags, such as the flickering of LEDs, the output voltage. The photodiode resistance is a function of light exposure. The resistance is reciprocally proportional to light intensity. The output can be observed on an oscilloscope to determine the performance of the photodiode.
Variables
The performance of the photodiode will be determined by varying the following parameters: 1. Wavelength of LED 2. Resistor in circuit 3. Frequency of blinking (1Hz - 100kHz)
The dependent variables that will be measured are: 1.
This will allow us to determine the following parameters: 1. Efficiency (Time decay) of photodiode at different wavelengths
Timeline and Milestone
| Week 8 (11 - 15 Mar) | Complete circuit set-up on PCB and prelimary measurements | |
| Week 9（18 - 22 Mar) | Data collection (vary LEDs) | |
| Week 10（25 - 29 Mar) * Well-being day (28 Mar), Good Friday (29 Mar) | Data collection (vary resistance) | |
| Week 11 (1 - 5 Apr) | Data Analysis and further measurements (if needed) | |
| Week 12（8 - 12 Apr）* Hari Raya (10 Apr) | Data Analysis and explore other light sources (phone/computer screens) | |
| Week 13 (15 - 19 Apr) | Analyse experimental results and complete documentation |