The difference between surface and edge emitting LED.
时间: 2024-06-03 21:11:20 浏览: 17
Surface emitting LEDs are also known as vertical cavity surface emitting lasers (VCSELs). They emit light perpendicular to the surface of the semiconductor wafer. Edge emitting LEDs, on the other hand, emit light from the edges of the wafer, parallel to its surface. The main advantages of surface emitting LEDs are their higher efficiency, lower power consumption, and ability to be fabricated in large numbers on a single wafer. Edge emitting LEDs, however, are generally more powerful and can be used for applications that require higher output power, such as fiber optic communications.
相关问题
Why we use Vertical Cavity Surface Emitting Lasers?
Vertical Cavity Surface Emitting Lasers are often used because they have a low threshold current, are easy to manufacture in large quantities, and have a circular, low divergence beam pattern which makes them more suitable for certain optical applications than traditional edge-emitting lasers.
Explain the functioning of Ultrasonic sensor.
An ultrasonic sensor works by emitting high frequency sound waves and then listening for the echo that bounces back. The sensor sends out a sound wave at a frequency above the range of human hearing, typically around 40 kHz. This sound wave travels through the air until it encounters an object in its path. When the sound wave hits the object, it is reflected back towards the sensor.
The ultrasonic sensor then measures the time it takes for the sound wave to return. By knowing the speed of sound in air and the time it took for the sound wave to return, the sensor can calculate the distance to the object.
This distance information can be used for a variety of applications, such as obstacle detection, distance measurement, and even object tracking. Ultrasonic sensors are commonly used in robotics, automotive applications, and industrial automation.
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![.pdf](https://img-home.csdnimg.cn/images/20210720083646.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)