Otis Singleton
An electric eye is a device that uses a photoelectric cell to detect changes in light intensity and the obstruction of a light beam. Electric eyes are used in a variety of applications, including automatic door openers, alarm systems, and camera designs. They can also be used to monitor motion in a given area, with the device only detecting the presence of light rather than providing an image.
| Characteristics | Values |
|---|---|
| Type of Device | Photoelectric cell, photodetector |
| Function | Monitors motion by detecting variations in light intensity, including obstruction of a light beam |
| Applications | Automatic door openers, alarm systems, vehicle counters, camera |
| Light Type | Visible light, infrared radiation, invisible UV wavelength |
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What You'll Learn
Electric eye as a motion monitor
An electric eye is a motion monitor that uses a photoelectric cell to detect the presence or variation in the intensity of light. It does not produce an image but rather detects the presence of light.
The concept of the electric eye was first introduced in the 1930s, with the development of an electric eye vehicle counter and an automatic door opener. The vehicle counter used two IR lamps to count cars and pedestrians, while the automatic door opener, called the "Magic Eye," was tested by General Electric in 1931 and used by hospitals. In the same year, an electric eye with an invisible UV wavelength was offered as a 24-hour alarm system for businesses.
One common application of electric eyes is in door safety systems, such as garage door openers. These systems use a light transmitter and receiver to detect any obstructions that break the light beam, preventing the door from closing and causing potential harm. Modern systems often use infrared radiation, which improves the range, sensitivity, and security of the device while concealing its operation.
Electric eyes have also found use in other areas. For example, in 1936, Dr. Albert Einstein and Dr. Gustav Bucky received a patent for a design that applied the electric eye to a camera. Additionally, touchless entry doors in shared workspaces may use electric eyes to operate, providing a more hygienic and convenient way to open doors.
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Electric eye in automatic doors
An electric eye is a photoelectric cell or photodetector that can detect obstructions in a light beam. This technology has been used for automatic doors since at least 1931 when General Electric tested the first automatic door openers, which they called the "Magic Eye".
Electric eyes are often used in garage door safety systems, where they detect objects in the door's path and prevent the door from closing on them. This can help to prevent injuries and even deaths, such as if a child runs under a closing garage door. In addition to garage doors, electric eyes can also be used for other automatic doors, such as those in hospitals, to allow guests to enter without needing to touch the door.
The electric eye works by using a light transmitter and receiver, usually at the bottom of the door, to detect the presence of a light beam. If the beam is broken by an obstruction, the door will not close. While visible light can be used, modern systems typically use infrared radiation, which improves the range, sensitivity, and security of the device by allowing it to reject stray light.
In addition to their use in automatic doors, electric eyes are also used in security systems, industrial machinery, and industrial machine vision applications. For example, they can be used to scan end products for defects or to count vehicles and pedestrians. With their increasing popularity and versatility, we can expect to see electric eyes continue to grow in usage.
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Electric eye in alarm systems
An electric eye is a photodetector used for detecting obstructions of a light beam. This technology is commonly used in garage door opener safety systems, where a light transmitter and receiver are installed at the bottom of the door to detect any objects in the door's path and prevent closing if an obstruction is detected.
Electric eyes have been used in security systems since the 1930s, when an electric eye vehicle counter was introduced in the US to count cars and pedestrians. In 1931, an electric eye using invisible UV wavelengths was offered to businesses as a 24-hour alarm system. This technology has evolved and is now used in modern alarm systems for various applications, including perimeter security systems, automatic doors, and industrial machinery.
The electronic eye, also known as the "magic eye," is a simple electronic device that continuously monitors the entrance of a home or business. When a person or object enters the field of view, the device detects the obstruction of a light beam and activates the alarm. This technology can be used in conjunction with a camera to provide visual confirmation of any intrusion.
The use of electric eyes in alarm systems offers several advantages. Firstly, they improve the range, sensitivity, and security of the device by using infrared light-emitting diodes that can reject stray light. Secondly, electric eyes do not require visual images to function, relying solely on the detection of light presence, which enhances their performance in low-light conditions. Finally, electric eyes can be designed to be compact and easy to install, making them a versatile option for various security applications.
In conclusion, electric eyes play a crucial role in modern alarm systems, providing improved security, versatility, and reliability. With the increasing demand for better security measures, the integration of electric eyes into alarm systems will likely continue to grow in popularity.
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Electric eye in cameras
An electric eye is a photoelectric cell or photodetector that detects changes in light intensity or the obstruction of a light beam. This technology has been applied to various fields, including door systems, alarm systems, and cameras.
The application of the electric eye to cameras was pioneered by none other than Dr. Albert Einstein and Dr. Gustav Bucky, who received a patent for their design in 1936. This invention revolutionised the field of photography and imaging by leveraging the electric eye's ability to detect light variations.
The electric eye camera functions by utilising a photoelectric cell or a photodetector to capture light variations and convert them into images. This process involves breaking down the scene into tiny elements and measuring the light intensity at each point. By doing so, the camera can create a detailed image based on the light information gathered.
One of the key advantages of electric eye cameras is their ability to detect and capture objects or movements that obstruct a light beam. This feature has been particularly useful in various applications, such as surveillance and wildlife photography, where capturing fast-moving or elusive subjects is crucial.
Over time, the technology has evolved, and modern electric eye cameras have improved significantly in terms of range, sensitivity, and security. The use of infrared light-emitting diodes has allowed these cameras to filter out stray light, resulting in clearer and more accurate images.
In conclusion, the electric eye camera, with its origins in the innovative minds of Einstein and Bucky, has paved the way for advanced imaging systems. By harnessing the detection of light variations, this technology has found applications in numerous fields, continually pushing the boundaries of what we can see and capture.
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Electric eye as a photodetector
An electric eye, also known as a photoelectric sensor or photo eye, is a device used to detect the presence or absence of objects by emitting a beam of light. When an object interrupts or reflects the beam of light, the change in light patterns is measured by a receiver, and the object is recognised.
Electric eyes are commonly used in industrial manufacturing fields such as material handling, packaging, food and beverage, and medicine. They are also used in door safety systems, such as garage door openers, to prevent the door from closing if there is an obstruction. The electric eye only detects the presence or absence of light, and does not provide an image.
In the 1930s, an electric eye vehicle counter was introduced in the US to distinguish between cars and pedestrians using two IR lamps. In 1931, General Electric tested the first automatic door openers, now popular in hospitals, and offered an electric eye alarm system to businesses. This system used invisible UV wavelengths to provide 24-hour security.
Modern photodetector systems use an infrared light-emitting diode modulated at a few kilohertz, which allows the detector to reject stray light and improve the range, sensitivity, and security of the device. Remote photoelectric sensors are used for remote sensing and contain only the optical components of a sensor, with the circuitry for power input, amplification, and output switching located elsewhere, often in a control panel. This allows the sensor to be very small, and the controls to be more accessible.
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Frequently asked questions
An electric eye is a device that uses a photoelectric cell to detect changes in light intensity to monitor motion in a given area.
An electric eye uses a light transmitter and receiver to detect obstructions in a light beam.
Electric eyes are commonly used in automatic door systems, such as those in hospitals, to detect obstructions and prevent the door from closing on someone or something.
Modern systems typically use infrared radiation, which offers improved range, sensitivity, and security, as well as concealing the operation of the device.
In the 1930s, electric eyes were used for vehicle counting and as alarm systems for businesses.
