Umair Gaines
An electric eye is a solid-state electronic device that converts light into electrical energy by producing a voltage or uses light to regulate the flow of current. It is used in automatic control systems for doors, burglar alarms, lighting, etc. It is a photo detector used for detecting the obstruction of a light beam. An example of this is the door safety system used on garage door openers that use a light transmitter and receiver to prevent closing if there is any obstruction. The device does not provide an image; only the presence of light is detectable.
| Characteristics | Values |
|---|---|
| First Introduced | 1925-1930 |
| Purpose | Detecting obstruction of a light beam |
| Use Case | Automatic control systems for doors, burglar alarms, lighting, etc. |
| Function | Converts light into electrical energy by producing a voltage or uses light to regulate the flow of current |
| Variants | Infrared, UV |
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What You'll Learn
Electric eye in robotics
An electric eye is a photoelectric cell or photodetector that detects the obstruction of a light beam. In robotics, electric eyes are being used in innovative ways to improve machine vision. For example, a system known as LENS uses a sensor, a chip, and a tiny AI model to learn and remember locations, mimicking the human eye and brain. This system is far more energy-efficient than conventional camera-based systems, using only 10% of the energy required by traditional location systems.
LENS was developed by a team led by Adam Hines, a bioroboticist at Queensland University of Technology in Brisbane, Australia. Speck, a commercially available product from SynSense, is a key component of LENS. Speck's visual sensor operates similarly to the human eye, waking up individual pixels only when they detect a change in brightness in the environment. This allows the sensor to focus on important structures, like edges, and reduces the amount of data that needs to be processed.
The LENS system has significant implications for the future of robotics, particularly for robots involved in space and undersea exploration, as well as for drones and microrobots. Its low-power consumption makes it ideal for these applications, where energy efficiency is crucial.
In addition to LENS, there are other advancements in robotic vision inspired by the human eye. For example, eye-tracking setups are being used to control assistive robotic arms and to interact with computers. Electroencephalography (EEG) and hybrid Brain Computer Interfaces (hBCI) are also being explored to measure neural signals and interpret a user's intentions, allowing for more intuitive control of external devices, including robots.
The field of robotics is constantly evolving, and the development of more efficient and effective robotic vision systems is a key area of focus. By drawing inspiration from nature and the human eye, researchers are creating innovative solutions that have the potential to revolutionize the way robots interact with their surroundings.
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Electric eye in door systems
An electric eye is a photoelectric cell or photodetector that can detect the presence or obstruction of a light beam. This technology is commonly used in garage door safety systems, where a light transmitter and receiver are installed at the bottom of the door. If an obstruction breaks the light beam, the door will not close, preventing accidents. Electric eyes do not capture images or videos, only detecting light.
The use of electric eyes in door systems has enhanced security and convenience for homeowners and businesses. In addition to garage doors, electric eyes are also used in automatic doors in various settings, such as hospitals, where they automatically open for guests. This technology improves accessibility and ease of movement, especially for individuals with disabilities or those carrying items.
General Electric played a pioneering role in the development of electric eye door systems. In 1931, they tested the first automatic door openers, branding their electric eye technology as the "Magic Eye." These early systems used lamps powered by direct current or power line alternating current frequency. Over time, advancements have been made, and modern photodetector systems employ infrared light-emitting diodes modulated at higher frequencies, enhancing the range, sensitivity, and security of the devices.
The application of electric eyes in door systems offers significant advantages in terms of safety. For instance, in garage settings, electric eyes can detect the presence of children or objects in the door's path, preventing potential injuries or fatalities. This feature is particularly crucial in safeguarding against dangerous garage door accidents. Additionally, electric eyes can be used in conjunction with auto-reverse functions, further enhancing safety by causing the door to reverse direction upon detecting resistance.
While electric eyes have proven valuable in door systems, they are susceptible to malfunctions and errors. Common issues include misalignment of the photo eyes, dirty lenses interrupting the light beam, and faulty wire connections. Regular maintenance and cleaning are necessary to ensure optimal performance and prevent accidents.
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Electric eye in cameras
An electric eye is a photo-detector that detects the presence or absence of light. It does not produce an image but is used to detect obstructions in the path of a light beam. The presence or absence of light is detected and used to regulate the flow of current.
The electric eye has been applied to cameras, with the first such patent awarded to Dr. Albert Einstein and Dr. Gustav Bucky in 1936. The electric eye in cameras can be used to detect the presence or absence of light, and this information can be used to adjust the camera settings accordingly for optimal image capture. For example, if the electric eye detects low light conditions, the camera may increase the exposure time or ISO sensitivity to compensate.
Electric eyes in cameras can also be utilised in more advanced ways, such as in autofocus systems. By analysing the light reflected off a subject, the camera can determine whether the subject is in focus or not, and adjust the focus of the lens accordingly. This is achieved through a series of micro adjustments until the maximum amount of contrast is detected, indicating that the subject is in focus.
In modern digital cameras, the electric eye can also be used in conjunction with facial recognition software. By detecting the presence of light and dark patterns, the camera can identify faces within the frame and adjust settings such as focus, exposure, and white balance to optimise the image for the detected face.
Furthermore, electric eyes in cameras can be employed in various security applications. For instance, a camera with an electric eye can be set up to detect changes in light patterns, such as the sudden appearance of a bright light at night, which may indicate a potential security threat. This triggers an alarm or notification to the relevant authorities, allowing for a swift response to any potential intrusion or threat.
Overall, the electric eye has had a significant impact on the development of camera technology, improving image quality, focus, and exposure, as well as enabling a range of security applications.
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Electric eye in lighting
An electric eye is a photoelectric cell or photodetector used for detecting obstructions in a light beam. In lighting, electric eyes are used in outdoor lights and automatic door systems.
History
The first automatic door openers were tested by General Electric in 1931 and were branded the "Magic Eye". These early systems used lamps powered by direct current or the power line alternating current frequency. In the same year, a version of the electric eye that used invisible UV wavelengths was offered to businesses as a 24-hour alarm system.
Modern Usage
Modern photodetector systems use an infrared light-emitting diode modulated at a few kilohertz, allowing the detector to reject stray light and improve the range, sensitivity, and security of the device.
Examples of Use
Electric eyes are used in garage door safety systems to prevent doors from closing on obstructions. They are also used in outdoor lighting, with products available on Amazon.
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Electric eye in burglar alarms
An electric eye, also known as a magic eye, is a photodetector used to detect obstructions of a light beam. This technology is often used in door safety systems, such as garage door openers, to prevent closing when something or someone obstructs the beam. The electric eye device does not produce images, but it can detect the presence of light.
The electric eye has been used in security applications, such as burglar alarms, since the 1930s. In 1931, General Electric tested the first automatic door openers, which used an invisible UV wavelength to detect obstructions. This technology was offered to businesses requiring 24-hour alarm systems.
Burglar alarms are designed around complete and incomplete electric circuits. When an intruder breaks a light or laser beam, the circuit is completed, and the alarm is triggered. The light beam is invisible to the human eye but is necessary to complete the circuit. Modern photodetector systems use infrared light-emitting diodes, which improve the range, sensitivity, and security of the device.
An example of an electric eye-controlled security system is one that uses an LDR as the main sensor. When anyone tries to open a locker, a shadow falls on the LDR, activating the circuit, and causing a buzzer to ring and an LED to glow. This technology can be applied to a home security system, where the doorbell is rung when a person is detected at the entrance.
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Frequently asked questions
An electric eye is a solid-state electronic device that converts light into electrical energy by producing a voltage or that uses light to regulate the flow of current.
The term "electric eye" was first recorded in the period 1925–1930. In 1931, General Electric tested the first automatic door openers now popular in hospitals. They called their invention the Magic Eye.
The electric eye is used in automatic control systems for doors, burglar alarms, lighting, etc. For example, a garage door opener uses a light transmitter and receiver to prevent closing if there is an obstruction in the way that breaks the light beam.
