Capacitive sensor and infrared (IR) sensor application principle

This year, the non-contact induction market is booming.
On the one hand, with the growth in demand for technical services such as smartphones and the Internet of Things (IoT), the application scenarios of non-contact sensing have been expanded; on the other hand, under the influence of the new virus epidemic, the global importance of health has renewed Awareness has also accelerated the development of this market because of the growing demand for non-contact sensing technology and non-contact biometric solutions with advanced tracking and control functions.
The non-contact sensing market is expected to grow from USD 6.8 billion in 2020 to USD 15.3 billion in 2025.
Two types of sensors are used in non-contact sensing devices: infrared sensors and capacitive sensors, both of which work by enabling electronic devices to communicate with the surrounding environment.
Infrared (IR) sensor
Infrared sensors emit and receive waves in the form of heat; in the infrared spectrum, all objects emit some form of thermal radiation. Although it is not visible to the human eye, it can be detected by an infrared sensor that interprets thermal radiation.
For example, motion sensors used in sanitary equipment, such as non-contact faucets, trash cans or dispensers. The sensor detects the movement around the object and turns on or off accordingly. Major producers of such technologies include Orbis, EMX Inc and Wilcoxon Research based in the United States.
In April 2020, in response to Covid-19, Japanese elevator manufacturer Fujitec launched a model with an optional non-contact panel that uses infrared sensors to detect the position of the user’s hand on the dashboard The required target floor, the technology is mainly aimed at hospitals, pharmaceutical manufacturers and food companies.
Optex, another Japanese manufacturer of high-performance induction technology, also introduced non-contact switches for opening and closing doors. When the hand is placed on the sensor, it will work, just like an automatic faucet and a buttonless pull.
Capacitive sensor
The electrical characteristics of the capacitor used in capacitive sensors lies between two conductive surfaces within a reasonable proximity. They work by generating electric fields and detect nearby objects by sensing whether the field is disturbed. They can detect any object that is conductive or has a dielectric constant that is very different from air, such as a human body or hand.
Capacitive sensors are non-contact devices that can perform high-resolution measurement of changes in the position of conductive targets. Capacitive sensor antennas (if large enough) will become more sensitive and can work in a non-contact manner, such as automatic faucets and gesture recognition devices (such as tablets and mobile phones).
Capacitive sensors can detect two types of targets-conductive and non-conductive. Conductive targets include metals, water, blood, acids, alkalis, and salt water. Major producers include American companies such as Baluff, Lion Precision and EMX Inc, as well as Micro Epsilon headquartered in Germany.
Non-contact biometric solution
In Japan, NEC Corp adopted facial recognition technology at its Tokyo headquarters in March 2020 in response to Covid-19, so that people no longer need to take off their mouth* and prevent them from touching their faces.
Capacitive sensor and infrared (IR) sensor application principle
Previously, their security ticket gates had difficulty identifying people wearing mouthpieces, sunglasses and hats. Their new system can detect who is under the mask by comparing the bare part of the face with the original image on the system software. The AI ​​of the system uses deep learning to accurately identify the person who is passing the ticket gate after showing the photo of the person wearing the mouth* or sunglasses.
After inquiries from other companies that want to implement the technology, the technology is likely to be on the market starting in September 2020. This may be particularly cautious in countries where oral sex is common, especially during winter and hay fever seasons.
Fujitsu, another company in Tokyo, is also implementing a trial of multi-biological authentication and payment systems in convenience stores. Their system relies on palm vein authentication and facial recognition. Cameras track the movement of customers around the store, and load cells check their purchases and automatically pay when they leave the store.
Conclusion
Due to the current Covid-19 pandemic, the demand for non-contact sensor technology has undoubtedly attracted people's attention. As the epidemic is not over, the industry’s prosperity will continue for some time. However, non-contact sensor technology products and the high initial costs involved in their implementation will be one of the main constraints on the market.

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