How does laser thermometer work?
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Infrared thermometers measure temperature using electromagnetic radiation (i.e. infrared) emitted from an object. They are sometimes called laser thermometers if a laser is used to help aim the thermometer, or non-contact thermometers to describe the device’s ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and its emissivity, the objects temperature can be determined.
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A thermometer is the most common method...\n\nUsually weather thermometres use alcohol rather than mercury as it is cheaper, less hazardous than mercury, and you are unlikely to measure close to or above 75 degrees celcius (which is the boiling point of ethanol).\nA thermometer works by filling a tube with the alcohol, as the temperature increases then the alcohol expands, thereby increasing in volume and rising up the tube. When the temperature decreases then the ethanol contracts and takes less space, thereby moving down the tube.\nIf you were to heat an alcohol thermometer in a fire it will burst as the ethanol expands so much as to destroy the tube.\n\nSome thermometers have small parts in them that are pushed up the tube and when the temperature drops the parts are stuck ther until you shake them... this hepls measure a maximum temperature.\n\n\n\nThere are also electronic methods, however these are often dependant on the humidity (moisture in the air) as a conductor... you may see such instruments in a sauna close to the roof.\nOther electronic thermometers are dependant on metal strips that change shape due to heat, allowing small changes in temperature to be measured. Your toaster will use something similar as a thermostat.\n\nI dont know much about the electronic types...
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(1) Take a container and measure the length of the container. Let us say the length of the container is L. \n\n(2) Take a beam of light (preferably a monochromatic source like laser beam) and shine it through the empty container. \n\n(3) Measure the intensity of the light at the end where the beam has gone through the empty container. Let this be Io. \n\n(4) Now fill the container with the liquid whose molar extinction coefficient is unknown. Now measure the light intensity as the beam travels the length L of the container. The measured intensity is I.\n\n(5) Beer-Lamberts law is I=Io exp(-a L) where all the quantities have been experimentally determined except a which is the extinction coefficient. \nRearrange the above formula and we get, a=(-1/L)*log(I/Io) where log is to the base e.
552742
simple - metal bars, same width and length different metals though - one side a candle at each end and the other end a thermometer - measure the temp. at different time intervals
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I don't know about a screen having a thermometer in it, but there are heat sensors on some computer motherboards, and, using the right software, you can retrieve the data. One of these programs is called "Motherboard Monitor 5.3.7" that you can download and use free from this address: http://www.download.com/Motherboard-Monitor/3000-2086_4-10518385.html?tag=lst-0-6
823896
did you mean how does a light sensor work?
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Go with a line graph, that way you can also find out (or estimate) temperatures at times when you didnt measure it.
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Infrared is a type of light.  When a solid is heated, it begins to emit light.  The cooler it is, the less light it emits, and the lower the frequency of the light.  Infrared is a type of light with a low frequency that we cannot see.  Other types of invisible low frequency light include radio waves and microwaves (like in a microwave oven), while high frequncy invisible light includes ultraviolet light, x-rays, and gamma rays.  If heated enough, an object will emit light in the frequencies taht we can see (called the visible spectrum).  This is how an incandescent light works (with a glowing filament), or why logs in a fire will glow, etc.\n\nVery few things you encounter give off light in a range where you can see the light.  But everything has some heat, and the amount of infrared light they release correlates to that temperature.  So a remote temperature reading can be assessed by the amount of infrared light released.
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An OTDR works by firing light down a fibre optic cable and then measuring the levels of reflected light and knowing the time it takes for the reflected light to be sensed it can tell how far the point of reflection is. They operate in a very similar fashion to radar and are designed to pick up faults in fibre optic cables, be they joints/splices, pressure faults, or clean breaks as these will all reflect light back down the fibre. The principles are also the same for radar in that the shorter the pulse the better the discrimination and the more accurate the outcome. In some case in fibre fault finding the operators of the OTDR will introduce faults on the fibre by submersing it in liquid nitrogen and then using it as a reference point to find the true fault. Having worked in fields where its not easy to find a fault with excavating kilometres of earth the nitrogen method is a god send if somewhat damaging to the cable.
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Lidar - LIght Detection And Ranging.\n\nThis technology is basically using light (usually from a laser) to measure distance.  Common applications are in laser (not ultrasonic) tape measures, surveying equipment, and LIDAR speed guns used by law enforcement.\n\nA LIDAR emits a characteristic modulated waveform from a laser.  The light travels to a surface, where it is reflected back to the LIDAR, and a receiver measures the time it took to make the trip (extremely fast).  Since the speed of light is a constant, the time can be calculated into a known distance.\n\nWith speed sensing LIDAR, two distance measurements are made in succession, and a distance/time calculation is performed to obtain the speed of an object (such as a car).
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there is a company called schrodinger, or something close t o that.\nthey make lasers measureing tools for the semiconductor and other industrues. they are in massachusetts.
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They are also used in pump-probe experiments-- if you want to measure things (atomic motion, for instance) on a very short time scale, you would need a very short pulse.  \n\nA pump-probe experiment uses one laser pulse to excite the sample, and then a second pulse is sent through the sample and some property of the pulse is measured i.e. transmission, reflectance, phase shift. as a function of the time interval between pulses.  From measurements at different times, you can determine the response of the sample to the laser pulse.
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A calorimeter works by preforming some reaction (Usualy combustion) in a sealed container which is contained in a larger vessel filled with some liquid of a known specific heat (usually water).  When the reaction is preformed, it can either give off heat or absorbe heat to the surroundings (the water).  By measuring the temperature change in the water, we can calculate the amount of energy absorbed/released by the substance during the chemical reaction.\n\nhttp://en.wikipedia.org/wiki/Calorimeter\nhttp://hyperphysics.phy-astr.gsu.edu/hbase/thermo/calor.html
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The scanner sends out a laser beam that reflects against the barcode on the object. The scanner is programmed to recognize the reflections of barcodes and use those to identify the product.
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I've heard of powerful lasers that can be used to measure the distance.
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Well an easy one is the thermometer of corse for the temperature \n\nAnother will be your barometer this instament measures pressure of the atmosphere (lower pressure a good signal for bad weather) \n\nThe anamometer we use to measure wind speed and direction \n\nNow one of the ccolest instaments we have is a laser cieliometer...aka(LBC) this device measures cloud heights by firing an invisible laser into the air, however it is only good up to 12,000ft AGL (above ground level)\n\nTransmisometer-runway visual range\nWSR-88D(Radar)- storm location, movement, intesity, direction...ect\n\nThere are several instaments we use....one of the best resources other than this might be to go to the local news station.
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You can get a infrared thermometer. just point it at the flame and it will tell you the temperature. it will also show you the differences when you move to diff rent colors in the flame.. blue being hotter than the yellow.. i bought one on line for 39 dollars from eBay i think