Infrared laser sensors that can detect movement.
You can find them on braindex.com. You can also try looking on www.tradekey.com.
It depends what kind of sensor you mean. There are lots of sensors in trains already... for such things as heat/smoke detectors, doors (which stop the train moving unless the doors are closed, fuel, signal sensors..... etc
Various ways. Infra Red sensors can be used for alarm systems to detect doors being opened or motion inside the vehicle. Sensors can be used in doors to detect when the door is opened, and trigger the internal light.
In automatic doors, an electromagnet is used to create a magnetic field that attracts or repels a metal plate on the door. When an electrical current is applied to the electromagnet, it generates a magnetic force that moves the metal plate, allowing the door to open or close automatically. This process is controlled by sensors that detect movement, ensuring the door operates efficiently.
motion sensors and voice activated doors
The main sensor used for garaged doors is a infrared line sensor. When the line of sight is broken the sensor is activated. Pressure sensors may additionally be implemented to stop the closing action if opposite pressure is sensed.
Interesting question, however I couldn't exactly find and accurate answer; the technology already existed in other industries, and slowly leaked into the garage door one as well. After too many accidents involving children being after playing around and with garage doors, a law named UL 325 passed, stating that each automatic system must be equipped with photo eye sensors, and it is mandatory. This happened in 1993, and since then, all automatic doors and openers are equipped with a set.
Light sensors are used in a variety of applications, including automatic lighting controls in buildings, photography, photovoltaic systems to optimize energy production, and in electronic devices like smartphones to adjust screen brightness based on ambient light levels.
Optical sensors are used to detect and measure light levels, colors, distances, and patterns. They are commonly used in cameras, barcode scanners, medical devices, and industrial automation systems for tasks such as detection, sorting, and monitoring.
Automatic: Dexron-6
Sensors in lifts are used to detect the presence of passengers and provide information to the lift control system. They can help prevent elevator doors from closing on passengers, ensure that the lift car is at the correct level for boarding, and monitor weight limits to prevent overloading. Overall, sensors improve the safety, efficiency, and performance of elevator systems.
Dexron 3.