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Topic: Micrometer (device)

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 Micrometer - Wikipedia, the free encyclopedia
A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots.
Micrometers of this type are read as follows: First determine the number of whole millimeters (if any) and the number of hundredths of a millimeter, as with an ordinary micrometer, and then find a line on the sleeve vernier scale which exactly coincides with one on the thimble.
To read a metric micrometer, note the number of millimeter divisions visible on the scale of the sleeve, and add the total to the particular division on the thimble which coincides with the axial line on the sleeve.
www.wikipedia.org /wiki/Micrometer   (759 words)

 Filar Micrometer
The filar micrometer is a device which is mounted in the optical path of a telescope and is used for measuring the angular separation between double stars.
Although the micrometer used for this purpose was originally calibrated in inches, this is of no consequence since measurements are made by recording the number of divisions on the scale, irrespective of the units.
To measure the separation between two stars the micrometer assembly is first rotated so that the cross-hairs are perpendicular to the imaginary line joining the images of the two stars.
www.skywatch.co.za /instruments/micrometer   (1339 words)

The UL-approved use of any microMETER equipment in installations operating at more than 240 volts and less than 600 merely requires the use of "thick wire" CT leads, which are orange in color when supplied by us and marked "600v".
Since the device reads out its information in the sequence 1 thru 16, it is essential to wire your circuits in the same sequence; in other words, in the order in which you want the circuits to be read out so that the printout of data won't be all jumbled up.
All circuits on the other side of the service drop, the "B" phases, must be wired into the microMETER with opposite polarity, ie, run the long lead into the negative side of the terminal and the short lead into the positive side.
www.micrometer.com /readme.asp   (1472 words)

The micrometer screw gauge also uses an auxiliary scale (measuring hundredths of a millimetre) which is marked on a rotary thimble.
The micrometers in our laboratory have a pitch of 0.50 mm (two full turns are required to close the jaws by 1.00 mm).
The micrometer screw gauge is used to measure even smaller dimensions than the vernier callipers.
www.phy.uct.ac.za /courses/c1lab/vernier1.html   (1141 words)

 AllRefer.com - micrometer (Technology: Terms And Concepts) - Encyclopedia
Another typical micrometer is the micrometer caliper, a device in which an object to be measured is enclosed between two jaws, one fixed and the other movable by means of a fine screw.
In both of these devices a fine hair or filament is moved from one extremity to the other of the image of an object and the distance read on a calibrated scale.
AllRefer.com - micrometer (Technology: Terms And Concepts) - Encyclopedia
reference.allrefer.com /encyclopedia/M/micromet.html   (225 words)

 Yerkes Observatory Virtual Museum-Instruments-Filar Micrometer
The micrometer is furnished with Burnham's illluminating device giving bright wires on a dark field.
In its general form and details it is similar to the micrometer of the 36 inch at Mt. Hamilton, which has proved so satisfactory in the measurement of all kinds of difficult objects.
The amount of light on the wires can be instantly changed by the observer so as to adapt the illumination to the measurement of the faintest objects which the telescope will show.
astro.uchicago.edu /yerkes/virtualmuseum/Micro.html   (139 words)

 TA: Tech Search
Busek has measured onset voltages of 1.2 and 1.4 volts per micrometer, which is about an order of magnitude lower than devices that rely on diamond or diamond-like carbon films.
The non-thermionic devices have onset voltages about an order of magnitude lower than devices that rely on diamond or diamond-like carbon films.
Terrestrial applications include all types of vacuum electronics, including flat-panel displays, microwave devices, and radars.
www.mdatechnology.net /techsearch.asp?articleid=519   (139 words)

 Manual Toggle Presses by SCHMIDT Technology
Optional Micrometer Ram Adjustment (F) Provides quick and precise micrometer adjustment of the working depth Total adjustment range is + 1.5 mm in 0.02mm/.060” in 0.0008” resolution.
Optional Stroke Return Lock (R) Ram travel completion device releasing the return stroke only after the selected ram target position has been reached.
Optional Stroke Return Lock (R) Ram Travel completion device releasing the return stroke only after selected ram target position has been reached.
www.schmidtpresses.com /pr-manual-tog.html   (257 words)

 Better Production - Job Shop Solves 2D Measurement Problem With Single-Axis Height Gage
It measures at an accuracy of (2+L/600) micrometer with 0.1 micrometer/0.5 micrometer resolution/repeatability.
Reading and transcription errors result from human interaction with the data generated by the measurement device.
Vickery says the source of the accumulation error was an inability to measure the relative positions of the many holes in the workpiece.
www.mmsonline.com /articles/0101bp5.html   (1188 words)

 Sperti Co.
The instrument is a small fork mounted EQ device with micrometer adjustments for setting latitude and a small single-lense sighting stage for determinition of declination.
Setting circles (there are six on the device) are all nicely calibrated, etched, color differentiated for South and North latitude adjustment, and easy to read -- though the device is only about 3 3/4" in diameter.
They have their strong points but setting circles are not among them.
www.cincytristate.com /sperti_co_.htm   (368 words)

 Column - Quality Gaging Tips: 3, 2, 1, Contact--Measuring Thickness
The gage may incorporate a motorized measuring contact along with the cam actuated device to retract the contact after a specific period of time, which prevents the parts from deforming and setting.
With flat and parallel contacts and constant gaging force applied with the friction or ratchet drive, the micrometer can self-align to the part for a fast and accurate reading.
A problem with the self-aligning flat contacts of the micrometer is they can bridge across and "average out" minute variations in thickness.
www.mmsonline.com /articles/1100gage.html   (613 words)

 Journal of Nanoelectronics and Optoelectronics
CHARACTERIZATION: materials characterization using Visible-UV PL, FTIR, Raman, STM, AFM, XPS, ESR, AES, X-ray, neutron scattering, surface electron diffraction, LEED and RHEED; structure analysis at atomic, molecular, nano and micrometer scales; electronic and phonon band structure; current-voltage, capacitance-voltage and thermal electron device characterization; optoelectronic device characterization.
PROPERTIES: Electrical, optical, optoelectronic, magnetic, chemical, thermal, mechanical and other physical properties; luminescence, dielectric and ferroelectric properties, photoconductivity; optics and nonlinear optics, photoinduced phenomena, liquid crystalline behaviors, crystallography, surface and interface properties, ultra-fast dynamics, modeling of electrical and optical properties of materials.
www.aspbs.com /jno.htm   (543 words)

 Gaertner Single Screw Measuring Engine
According to Schlesinger, "As compared with the usual method, in which a graduated circle is employed, this device has the disadvantage of not permitting the measurement of position angles.
A star is then placed under the micrometer by moving the microscope carriage (5) right and left using the handwheel (1) on the left of the machine.
The engine was designed by Frank Schlesinger, the man most famous for coming up with a way to determine parallaxes from photographic plates at the time of the turn of the century.
www.astro.virginia.edu /~afs5z/gaertner1.html   (1447 words)

 DNA transport by a micromachined Brownian ratchet device -- Bader et al. 96 (23): 13165 -- Proceedings of the National Academy of Sciences
We have micromachined a silicon-chip device that transports DNA with a Brownian ratchet that rectifies the Brownian motion
In conclusion, we have fabricated a Brownian ratchet device that is capable of transporting small DNA molecules in aqueous
Brownian ratchets have been demonstrated to transport micrometer- to millimeter-sized particles in experiments with ratchets
www.pnas.org /cgi/content/full/96/23/13165   (2657 words)

 Electro-optic device for continuously monitoring the relative positions of two machines or parts thereof - Patent 4991965
Electro-optic devices employing beam transmitters mounted on one machine for transmitting a light beam to a reflector on a second machine which reflects the light to a receiver producing electrical signals indicative of the relative positions of the machines are known as described in the publication WO 84/04960 and the German unexamined specification 3,419,059.
Electro-optic devices employing beam transmitters on one machine transmitting a light beam to be reflected from a second machine to a beam receiver to monitor the mutual alignment of these machines are described for example in U.S. Pat.
It has in the past been necessary in utilizing the signals provided by the beam receiver to employ a manual sequencing device of some known design with cyclical stepping from one unit of information to the next one in a given sequence.
www.freepatentsonline.com /4991965.html   (1936 words)

 AUTOS & BOATS : Brakes : Servicing Drum Brakes : DIY Network
This measurement is taken with a drum micrometer (figure D), a device that measures the interior diameter of the drum in increments of thousandths of an inch.
Before a drum can be resurfaced, it must be measured to determine whether there is sufficient thickness left so that removing a miniscule layer of the inner surface won't result in brake drums that are too thin.
Drum brakes are found most frequently on the rear of a vehicle.
www.diynet.com /diy/ab_brakes/article/0,2021,DIY_13682_2271408,00.html   (1114 words)

 Experiment 02
Instead of using a vernier scale to improve precision, a micrometer uses two scales: a barrel scale and a circular scale.
You may be able to adjust the device to correct for zero error, but usually it is easier to record the error and use it as the zero mark for all measurements.
Consequently, if the vernier were moved ahead so that the second vernier mark lined up with the 7 division mark on the main scale, the zero vernier mark would be 2/10 of a main scale division to the right of the 5 division mark on the main scale.
feynman.bgsu.edu /physics/rm133/expt.1.02-meas/Expt.1.02-intro.html   (1176 words)

First of all, due to the lateral nature of the device, the spacing between the ferromagnetic contacts has to be relatively large (of the order of a micrometer), which requires that the spin-flip length in the semiconductor channel should have a similar, or preferably larger value.
The spin polarization is produced by conventional (Fe, permalloy, Ni or Co) ferromagnets or by epitaxially grown ferromagnetic layers (such as MnAl), which are compatible with the III/V materials used.
Related topics studied by the SPIDER partners are: the study of magnetoresistance of magnetic grains embedded within a semiconductor host, the generation of spin-polarized carriers in III/V semiconductors with circularly polarized light, and the study of transport in hybrid systems with ferromagnets coupled to superconductors.
tcd.ie /Physics/People/Michael.Coey/oxsen/newsletter/june97/spider.htm   (1176 words)

 Emerson Rubber Buffing Machine
Platens, the necessary holding device for the samples to be buffed, are sold as accessories and should be chosen by the user based on the configuration of the sample.
A micrometer dial feed, accurate to within.002", insures uniform and repeatable results.
The Rubber Buffer is normally supplied with a 5-inch diameter/36 grit grinding wheel but other sizes and grits are available on request.
www.emersonapparatus.com /Products/MKBUFFER.htm   (1176 words)

 AXUV, XUV Photodiode Ion Detectors Operating Principles
As absorption depths for the majority of XUV photons are less than 1 micrometer in silicon, the absence of a dead region yields complete collection of the photogenerated carriers by an external circuit resulting in 100% carrier collection efficiency and near theoretical quantum efficiency.
This results in device quantum efficiencies (electrons seen by an external circuit per incident photon) much greater than unity, which increase linearly with photon energy.
For the majority of XUV photons, about 3.7 eV energy is required to generate one electron-hole pair.
www.ird-inc.com /axuvope.html   (362 words)

 Measurement of Pressure With The Manometer
These are simply U-tube manometers modified so the liquid level can be read with a micrometer, yet retaining the basic "Physics" of the hydrostatic U-tube primary standard.
This device indicates the difference between two pressures (differential pressure), or between a single pressure and atmosphere (gage pressure), when one side is open to atmosphere.
The U-tube manometer is a primary standard because the difference in height between the two columns is always a true indication of the pressure regardless of variations in the internal diameter of the tubing.
www.dwyer-inst.com /htdocs/pressure/ManometerIntroduction.cfm   (915 words)

Two such instruments that are based on a vernier scale which you will use in the laboratory to measure lengths of objects are the vernier callipers and the micrometer screw gauge.
The precision of length measurements may be increased by using a device that uses a sliding vernier scale.
The main scale reading is the first reading on the main scale immediately to the left of the zero of the vernier scale (3 mm), while the vernier scale reading is the mark on the vernier scale which exactly coincides with a mark on the main scale (0.7 mm).
www.phy.uct.ac.za /courses/c1lab/vernier1.html   (1141 words)

 Nikon MicroscopyU: Modulation Transfer Function
Radial modulation transfer targets are ideal for high-resolution measurements using photographic film or analog sensors, but the horizontal and vertical pixelated nature of CCD detectors benefits from analysis utilizing targets that are geometrically consistent with the pixel rows and columns of the imaging device.
Direct measurements of the modulation transfer function are conducted by utilizing specific test pattern targets consisting of high-contrast periodic line gratings having a series of spacings that usually range from one or several millimeters down to 0.1 micrometer, as illustrated in Figure 8.
Modulation is typically less in the image than in the specimen and there is often a slight phase displacement of the image relative to the specimen.
www.microscopyu.com /articles/optics/mtfintro.html   (4055 words)

 leyden jar & gap
This leyden jar/electrode combination has an adjustable gap with a micrometer-like adjustment.
This device might also be called a unit jar.
The electrical contacts to the inside of the leyden jar are made with three brass legs.
www.uvm.edu /~dahammon/museum/leydenjar&gap.html   (123 words)

 Professional Cameras
The mechanism of this device is not the usual double shutter, but is operated by gradually closing a diaphragm.
The complete outfit, with lenses mounted in micrometer mounts will cost between three thou-sand and thirty-five hundred dollars.
This is not true with the diaphragm dissolve in which the fading of the light is uniform throughout the dissolve.
www.oldandsold.com /articles24/motion-picture-4.shtml   (123 words)

 NANOHUB.ORG - Electronic Transport Through Self-Assembled Monolayers
Electronic charge transport is investigated for various-length alkanethiol SAMs using three different characterization methods, in which lateral areas span the nanometer to the micrometer scale.
Specific research interests are (1) characterize the electrical and structural properties of nanostructures involving single molecules, nanoparticles, and their arrays and (2) assemble these "nano-building blocks" (such as molecules, nanoparticles) into electronic devices.
Here we demonstrate cross-platform device characterization for the metal-insulator-metal (M-I-M) tunneling through a large bandgap alkanethiol self-assembled monolayers (SAMs).
www.nanohub.org /index.php?option=content&task=view&id=39&Itemid=60   (123 words)

 Glossary of Foundry Terms - V - from Atlas Foundry
A method of determining the hardness of steel using a diamond pyramid that is pressed into the polished surface of the specimen and the diagonals of the impression are measured with a microscope fitted with a micrometer eye piece.
A mechanical device, operated by compressed air or electricity, used to loosen a pattern from a mold by jarring or vibration as it is withdrawn from the sand.
A white, hard, metallic element, mp 1800°C (3272°F), used as an alloy in iron and steel; a powerful carbide stabilizer and deoxidizer.
www.atlasfdry.com /glossaryv.htm   (123 words)

 Swazey & Reeds [1978]. Today's Medicine, Tommorow's Science... Chapter 4.
The Horsley-Clarke device, a special kind of head-clamp combined with three-dimensional micrometer measuring devices, enabled physicians and laboratory researchers to make surgical or electrolytic lesions in precisely determined spots in the brain.
The elaborate relationships of the sex hormones and glands with reproduction, growth, development, and behavior are only touched upon, chiefly because the history of sex endocrinology currently is being dealt with extensively by historian Diana Long Hall.
( 2) The importance of special instruments for the advancement of both neuroenclocrinoiogy and neurosurgery is illustrated by the sterecitaxic instrument developed in 1908 by British neurosurgeon and neurophysiologist Victor Horsley and his colleague R. Clarke.
newman.baruch.cuny.edu /DIGITAL/2001/swazey_reeds_1978/chap_04.htm   (123 words)

 Research Projects
A device based on a solid-state blend of a conjugated polymer and a photochromic molecule is presented.
A LED based on a donor-acceptor-donor conjugated polymer yields photo- and electroluminescence peaking at about 1 micrometer wavelength.
Electrochromism induced by the electric field in an electrolyte is demonstrated, and used to measure the transport properties of the electrolyte or the magnitude of the applied field.
www.orgel.itn.liu.se /research   (453 words)

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