A Complete Collection of 100000 Whys
Fav十万个为什么
为什么自动门能感应人体？
简单的摘要：自动门能感应人体主要是通过红外感应、微波雷达以及图像识别技术。
1、红外感应器通过发射和接收红外线来检测人体或物体的接近，当人体靠近时，红外线被反射或阻断，触发开门信号。
2、微波雷达利用微波的多普勒效应检测物体的移动，当人体靠近时，微波反射信号发生变化，从而感应到人体并触发开门。
3、部分高端自动门还配备图像识别技术，通过摄像头捕捉和识别人体，确保更精准的感应和开门控制。
1. This tool has compiled a vast collection of questions and answers to help answer your everyday queries.
2. Simply enter the keywords for your search directly into the input box above.
3. The data in this tool is collected from the internet; if you find any errors, please report them to us so we can correct them.
Recommended Tools
![AES encryption and decryption tool]()
AES encryption and decryption tool
AES online encryption tool/AES online decryption tool
![Audio equalization segmentation tool]()
Audio equalization segmentation tool
Divide the audio into N equal parts online and download them locally.
![Chmod Calculator]()
Chmod Calculator
A powerful tool for quickly calculating Linux file permissions
![Nth power calculation tool]()
Nth power calculation tool
Online Nth power calculation tool
![Water hardness calculator]()
Water hardness calculator
Calculate the hardness of water to evaluate water quality
![State Secrets SM2 Encryption/Decryption]()
State Secrets SM2 Encryption/Decryption
An online tool for encrypting, decrypting, signing, and verifying using the State Secrets SM2 algorithm
![日期天干地支计算器]()
日期天干地支计算器
在线推算指定日期的天干地支等信息
![Electronic Signature Generator]()
Electronic Signature Generator
Online electronic signature generation tool
![Complete Guide to Food Pairing]()
Complete Guide to Food Pairing
The benefits and drawbacks of online food pairing
![SQL compression/formatting]()
SQL compression/formatting
SQL online compression/SQL online decompression and formatting tool
![Online GIF image decomposition]()
Online GIF image decomposition
An online tool for decomposing GIF images
![HAC hash encryption]()
HAC hash encryption
The HMAC hash online encryption tool supports multiple encryption methods
![Designated frequency sound generator]()
Designated frequency sound generator
Generate sinusoidal sound of specified frequency online and download it
![Image format conversion]()
Image format conversion
A secure and free online image format conversion tool
![Comparison Table of National Language Codes]()
Comparison Table of National Language Codes
Online search for codes corresponding to languages of various countries
![Mobile phone number location inquiry]()
Mobile phone number location inquiry
Online mobile phone number attribution query tool
![Online Maze Game]()
Online Maze Game
A small game for online maze exploration
![Child height prediction]()
Child height prediction
Predicting a child's height based on their parents' height
![Reaction speed test]()
Reaction speed test
Tools to help people test and train reaction speed
![Festival Avatar Generator]()
Festival Avatar Generator
Add holiday decorations to avatars, supporting National Day, Spring Festival, Christmas, etc
![Online salary conversion tool for single and double rest days]()
Online salary conversion tool for single and double rest days
Online single or monthly leave monthly salary conversion
![Facial Text Editor]()
Facial Text Editor
Online emoji editor
![Xiaoliuren online calculation]()
Xiaoliuren online calculation
Xiaoliuren (Zhuge Ma Pre class) Online Calculation Tool
![Password strength detection tool]()
Password strength detection tool
Check the strength of passwords online to ensure your security
粤ICP备2021116614号