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sensors can detect blood flow ,the movements of body and IR sensors can find the temperature of human body
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Are the infrared sensors dangerous?
no
What is an electric power sensor?
Electrical power sensors are used to measure characteristics of electric power such as voltage, current, power, and potential degradation of insulation due to age. For AC circuits, an electric power sensor can also be used to measure power quality. Some electrical power sensors are incorporated into transformers or other components of the power distribution grid. Others are added to existing systems. Typically, these electrical power sensors measure one or more physical characteristics and convert them to electrical signals. Basic electric power sensor categories include electrical capacitance sensors, electrical frequency sensors, electrical resistance sensors, and electrical conductance sensors.
What does a BCD invalid code detector do?
detects the invalid portion of the bcd number codes (1010-1111)
How does an occupancy sensor work?
The general answer is that occupancy sensors work by detecting human presence or activity. The specific answer is that occupancy sensors use one or more of three different technologies to detect or "sense" human presence and/or activity. The most common technology is passive infrared (PIR). A PIR sensor works by sending out invisible infrared beams that read or respond to temperature differences. If there is no one in the range of the sensor the sensor does not respond. When a warmer object, such as a human body, crosses two or more beams the sensor responds to the difference in temperature between the person and the background. This is the tecnology used in basic security sensors. In the case of a basic security sensor, there will be typically 4 - 10 beams which means each beam is fairly wide. This is why you can sometimes walk directly towards a security sensor and nothing happens. It is because you are moving within one beam and not crossing two beams. Only when you cross at least two beams will the sensor activate. In modern PIR occupancy sensors there can be over 1400 individual beams which makes them much more responsive to small movements such as sitting at a desk and typing on a keyboard. PIR works very well in most commercial environments and can detect at a long range, up to 40 meters, in warehouses and underground car parks. PIR has several limitations, however; it requires line of sight and will not read through any material including glass. In addition, PIR does not work well in extremely warm envorinments as it cannot distinguish between the temperature of the human body and the background. The second common technology is microphonics. As the name implies, occupancy sensors that incorporate microphonics work by picking up noise that is typical of human occupancy or activity. Advanced microphonics sensors incorporate Automatic Gain Control (AGC) and can "learn" background noises such as the steady hum of a central air conditioner or the sound of a circulating fan. They are also sensitive enough to pick up sounds typical of human activity such as typing on a keyboard, talking on the phone, a phone ringing, tapping on a desk, a chair squeaking, walking on a wood floor and numerous other sounds that are typically generated by human presence or activity. Microphonics type sensors do not require line of sight and can hear around corners. This type of sensor works very well in large open plan office and commercial areas as they can cover a large area without having to "see" all of it. The limitation of microphonics sensors is that they do not work in very noisy envorinments such as a factory or where a recurring noise not necessarily related to human activity such as a TV that stays on in the background or an individual, window type air conditioner that comes on and off whether there is a person in the room or not. The third common tecnnology is high frequency (HF) ultrasound or ultrasonics sensors. HF works exactly the same as a bat's "radar" or a submarine's "sonar." The sensor sends out a high frequency sound wave that bounces around the space and returns to the sensor. Any movement that disturbs the wave activates the sensor. HF sensors can be very sensitive and can read through many materials including the most commonly used interior construction materials and glass. From a human occupancy standpoint, HF's big limitation is that it responds to any motion, not just human presence. For example, an open window and rustling curtains or a moving window shade or, in an office environment a piece of paper coming out of a printer, can activate an HF sensor even if no one is there. To enhance the strengths and minimize the limitations of each of the three technologies, sensor manufacturers sometimes combine technoligies in "dual technology" sensors that typically include a combinaton of PIR and either microphonics or HF. The most imortant issue for a successful occupancy sensor installation is to understand the strengths and limitations of each type of sensor and to choose the appropriate sensor for th application. Occupancy sensors can save significant amounts of energy and take the human factor out of remembering to turn off the lights, the air conditioner and any other equipment that only needs to be on when there is human presence.
Difference between sensor and Acatuars?
A sensor is a device that is programmed to send a signal as soon as a specified event occurs; for example the motion sensor in supermarket doors. Meanwhile, an actuator is a device that does an especifc action according to a signal received. Lets go back to the door: Once the motion sensor detects a movements, it send a signal to a piston that moves the door. To sum up: sensors detect events and actuators perform an action
What type of sensors exploratory robots use?
Heat, motion, and cameras. Heat detects temperatures of life such as us. Motion detects movement of anything in the robots sight, and cameras provide the details of the exploration.
What three vehicle systems are parts of advancetrac without roll stability control?
A System of speed sensors and tire pressure sensors that helps detects and counteracts the tendency for the vehicle to roll over
How do Motion Sensing Lights Work?
Motion sensing lights use a passive system that detects infrared energy. These sensors are known as PIR (passive infrared) detectors or pyroelectric sensors. Human skin averages to be 93 degrees F, which radiates infrared energy in a wavelength that is between 9 and 10 micrometers. The sensors dectect quick movement of objects that radiate between 8 to 12 micrometers of infrared energy.
How do military technology detects smokes from battle vehicles emission?
If the smoke is not enough to be detected visually, it can be detected by infra-red (heat sensors).
What does the iris do for the human eye?
the iris finds and detects images and sends them to the brain
How does an automatic trash can work?
An automatic trash can works by using sensors to detect movement. One can wave their hand in the line of the sensors, even a few meters away, and the trash can will open automatically, then close when it no longer detects activity.
Do occupancy sensor sense the human bodies in an open area if so then how far it detects the human presence?
Yes. Occupancy sensor do sense the human movements in an open area with in the specified range. It is better to refer to the data sheet of a specific make, model to decide on the range. There are two types of occupancy sensors. Pyrotech Infra red (PIR) type or Ultrsonic type.
Which of the human body's basic senses detects temperature and pressure?
All except sound
Do military robots have sensors?
Yes, of course. Sensors are necessary to check own status and/or of any object (like human target). Without sensors any robot is not able to search, find, indentify or even to move in difficult area. Sensors are important to receive feedback for the human, who is steering a robot. If robot is at automatic drive (no human is steering - only on software running) sensors are also very important to the robot to get any information about the outside, the surrounding of it.
How do you activate a motion sensor without a human being or animal?
I have had motion sensors activated by wind moving branches, pine cones falling from trees and hail storms.
Do some red lights on change if a car is there?
Some have sensors which will indicate that a car is at the intersection, some have pressure plates at the intersection which detects the weight of a vehicle on it, some are just timed.
What is the difference between a passive sensor and an active sensor?
active sensors are sensors that transmit some kind of energy ( microwave , sound , light , .... ) into the environment in order to detect the changes that occur on the transmitted energy . That means it transmits and detect at the same time . But passive sensors don't transmit energy but only detects the energy transmitted from an energy source, e.g. motion detectors which are mostly passive infrared sensors.
