There are over 2 billion smartphone users in the world, but very few of them know the terms like PDAF, AutoFocus, Accelerometer, Gyroscope, Proximity Sensor etc. which are more technical and hard to understand. These terms always put a question in mind, What is it? I guess again you are in the same situation and your want to know What is the proximity sensor?
So, we are not going to break our promise to make technology simple and understandable, don’t worry we are going to give the answer to this question.
What is a Proximity Sensor?
A Proximity Sensor means a sensor that helps in detecting the presence of any nearby objects without any physical contact.
How Does a Proximity Sensor Work?
A proximity sensor emits a beam of electromagnetic radiation or an electromagnetic field radiation (infrared, for instance), and looks for changes in the field. The object being sensed is reflected as the proximity sensor’s target.
Different Proximity Sensor targets demand different sensors. For example, an inductive proximity sensor always requires a metal target and a capacitive or photoelectric sensor might be suitable for a plastic target.
The maximum distance the sensor can detect is called as “Nominal Range”. Some sensors have adjustments of the Nominal Range, this adjustments process is known as “Thermosensation”.
Proximity sensors may have a long functional life and high reliability because of the absence of mechanical parts and lack of physical contact between the sensor and the sensed object.
What is the use of Proximity Sensor?
Mostly Proximity sensors have commonly used in smartphones to detect accidental touchscreen taps when held to the ear during a call. Also, it reduces the display power consumption by turning off the LCD screens internal light while a person on the call.
Other Uses of Proximity Sensor
- Parking sensors: This sensor is used to sense the distance while parking this systems is mounted on car bumpers.
- Ground proximity warning system for aviation safety
- Vibration measurements of rotating shafts in machinery
- Sensing breakage of the sheet in a paper machine.
- Anti-aircraft warfare
- Roller coasters
- Conveyor systems
- Beverage and Food Can Production lines
- Improvised Explosive Devices
- Mobile devices:
- Touch screens that come in close proximity to the face
- To reduce the radio radiation exposure when radio power in close proximity to the body.
- 3D Touch will come with the aid of proximity sensing elements.
These are the different Types of Proximity Sensor:
- Capacitive sensor
- Capacitive displacement sensor
- Doppler effect (sensor based on effect)
- Eddy-current sensor
- Inductive sensor
- Magnetic, including magnetic proximity fuse sensor
- Optical sensor:
- Photocell (reflective) sensor
- Laser rangefinder sensor
- Passive (such as charge-coupled devices) sensor
- Passive thermal infrared sensor
- Radar sensor
- Reflection of ionizing radiation
- Sonar (active or passive)
- Ultrasonic sensor(sonar which runs in air)
- Fiber optics sensor
- Hall effect sensor
Some of Best Android Smartphones having Proximity Sensor Feature
- Asus Zenfone 3
- Asus Zenfone 3s Max
- Asus Zenfone Selfie
- HTC Desire 630
- HTC Desire 825
- HTC one X9
- Lenovo Vibe K5
- Lenovo Vibe K5 Note
- Lenovo Vibe P1m
- Lenovo Zuk Z1
- OnePlus 3
- Panasonic P55 Novo
- Panasonic P66 Mega
- Samsung Galaxy A9 Pro
- Samsung Galaxy J5 Prime
- Samsung Galaxy J7 Prime
- Sony Xperia E5
- Xiaomi Redmi 3s
- Xiaomi Redmi 3s Prime
- Xiaomi Mi 4
- Xiaomi Redmi Pro
- ZTE Blade A2 Plus
All iOS Smartphones that are currently available in the market has Proximity feature.