Optical Semiconductor Devices Frequently Asked Questions
The following are frequently asked questions on Optical Semiconductor Devices.
Click an item to view its answer.
- Visible LEDs
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- What is the difference between λp (peak wavelength) and λd (dominant wavelength)?
- What is the difference between Iv (luminous intensity) and F (luminous flux)?
- What is the directivity?
- What is the CIE chromaticity diagram?
- What is the 4-element LED?
- How is the white LED realized?
- Can you use the LED in combination with a light receiving element?
- How much current (mA) can you run to the LED lamp?
- Explain the LED lamp mounting method and conditions.
- Photocouplers/Photorelays
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- What is a photocoupler?
- Why is a photocoupler required?
- What types of photocouplers are available?
- Please explain the safety standards.
- What is the conversion efficiency?
- What is the difference between the mechanical relay and photorelay?
- What are the contact-a and contact-b of the photorelay?
- What is the CR product of the photorelay?
- What is the difference among the A-, B- and C-connections, and that among their roles?
- What is the difference in the capability and usage between the zero cross (ZC) type and non-zero cross (NZC) type phototriac couplers?
- Photosensors
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