Hi! I am currently assigned to do a report on the sensing unit of a counting and display system for factory automation and the unit consists of an infra-red circuit and a transmitter-receiver. I am suppose to provide information on that, however, I could not seem to find any relevant ones. Can anyone help me with that? Thanks!
2007-02-03 03:20:58 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
IR for factory automation (proximity and edge detection) is an invisible (to our eyes) wave lenght of light. When IR sensors are used in a conveyor system IR heat detection is not an issue.
Edge detection is when a package on a conveyor belt breaks a light beam. A light source is on one side of the conveyor and a light sensor one the other side. As long as the light beam shines on the light sensor nothing is blocking the beam. The moment a package or other object blocks that light shining onto the sensor the sensor output changes (Closing a contact or changing a voltage) The control automation senses the change in state of the light sensors output and increments a counter(or performs some action like filling a container etc...)
Proximity Detection is sensing when an object comes with in a certain distance. An IR system for proximity detection works in a similar fashion to edge detection where there is a light source and a detector. However rather than breaking a beam of light by an object passing between the two, proximity detection bounces the light off an object.
With IR proximity detection the light source and sensor are side by side facing the same direction. As a package approaches the sensor IR light is reflected off of the object towards the sensor. As the object gets closer more light is reflected and eventually the amount of reflected light will trigger the sensor and signal the control automation to do something.
2007-02-03 05:14:35 · answer #1 · answered by MarkG 7 · 0⤊ 0⤋
Infrared is just a fancy name for a red light that because of its wave length is not visible to the human eye. A transmitter/receiver sensor system is just that transmitter (light) and a receiver that only responds to that light. The receiver will output a signal depending on how its set up when it sees the light or not sees the light giving you a way of sensing the presents or non-presents of an item or product.
http://www.bannerengineering.com/products/
2007-02-03 03:37:32 · answer #2 · answered by tallbrian1000 5 · 1⤊ 0⤋
I have to study about this also.
Infrared is a wireless transmission medium that carries data via light beams
Transmitter and receiver must be in line of sight
An IrDA port is needed to use infrared with a computer. If you need fater information then you might have look at what it says about cable or how the signal works.
2007-02-03 04:03:16 · answer #3 · answered by Anonymous · 0⤊ 1⤋
An infrared detector is a photodetector that reacts to infrared (IR) radiation. The two main types of detectors are thermal and photonic.
The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena. Bolometers and microbolometers are based on changes in resistance. Thermocouples and thermopiles use the thermoelectric effect. Golay cells follow thermal expansion. In IR spectrometers the pyroelectric detectors are the most widespread.
The response time and sensitivity of photonic detectors can be much higher, but usually these have to be cooled to cut thermal noise. The materials in these are semiconductors with narrow band gaps. Incident IR photons can cause electronic excitations. In photoconductive detectors, the resistivity of the detector element is monitored. Photovoltaic detectors contain a p-n junction on which photoelectric current appears upon illumination.
Type Spectral range (μm)
Indium gallium arsenide (InGaAs) photodiodes 0.7-2.6
Germanium photodiodes 0.8-1.7
Lead sulfide (PbS) photoconductive detectors 1-3.2
Lead selenide (PbSe) photoconductive detectors 1.5-5.2
Indium arsenide (InAs) photovoltaic detectors 1-3.8
Platinum silicide (PtSi) photovoltaic detectors 1-5
Indium antimonide (InSb) photoconductive detectors 1-6.7
Indium antimonide (InSb) photodiode detectors 1-5.5
Mercury cadmium telluride (MCT, HgCdTe) photoconductive detectors 2-25
Mercury zinc telluride (MZT, HgZnTe) photoconductive detectors ?
Vanadium pentoxide is frequently used as a detector material in uncooled microbolometer arrays.
2007-02-03 03:31:56 · answer #4 · answered by Anonymous · 1⤊ 1⤋
Infra Red rays are light rays that are below red in frequency. They produce a sensation of heat when they fall on our skin. They can be detected by many types of sensors, photoelectric and thermoelectric etc. Look in any good catalogue of electronic sensors and you will find information.
2007-02-03 03:27:16 · answer #5 · answered by Swamy 7 · 1⤊ 2⤋
it's just a CCD camera tuned to detect infrared, even a normal digital cameras can "see" some infrared, try to use a remote in front a digital camera, and you will se a light from your remote controller thet your eye can't see.
So search for CCD technology
2007-02-03 03:28:46 · answer #6 · answered by scientific_boy3434 5 · 0⤊ 1⤋
it detects body heat or any other type of heat.
used mainly during earthquakes and landslides when victims are under the debris. the detector detects infrared body heat and hence victims are taken out of the rubble.
2007-02-03 03:28:00 · answer #7 · answered by cutiepie_4ever 2 · 0⤊ 2⤋
u simlpy can consider it as a wall which change its color or rediate when the infrared falls on it
2007-02-03 03:52:21 · answer #8 · answered by kater al nada 2 · 0⤊ 1⤋
im not sure but doesnt infrared detect heat?
2007-02-03 03:24:44 · answer #9 · answered by Lani 2 · 0⤊ 2⤋
its a red beam, that detects heat signatures.
2007-02-03 03:24:48 · answer #10 · answered by kute_regina_gal 4 · 0⤊ 2⤋