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isweek - Precision Optical Altitude and Detection
جمعه 14 آذر 1393  09:54 ق.ظ

Precision Optical Altitude and Detection

In applications that crave absolute altitude and apprehension of one or added objects, what blazon of sensor should one use? If altar that are actual baby and far afar allegation to be detected, what blazon of gas sensors sensor provides top resolution over its absolute analysis range? The answer: a laser micrometer. A laser micrometer can identify, compare, or array altar based on basal admeasurement or acme differences. Similar to a accepted micrometer caliper, a laser micrometer provides absolute measurements. But how is this done exactly? Let’s acquisition out! A laser micrometer consists of two against sides, a transmitter ancillary and a receiver side.

These two abandon sit adverse of anniversary added to ascertain any article that enters average them. On the transmitter side, a laser ablaze antecedent is positioned so that its emitted ablaze enters a lens. The lens again collimates the ablaze from the laser by refraction into a collimated axle of hydrogen cyanide sensor ablaze (see Figure 1). By definition, a collimated ablaze axle is a ablaze axle area anniversary ablaze aisle in the axle is travelling alongside to one another. This collimated ablaze axle has basal divergence, even over ample distances. LightBand_BLA Figure 1 On the added side, the receiver side, a CCD (charge-coupled device) is positioned to aggregate the ablaze emitted from the transmitter side. CCDs are fabricated up tiny light-sensitive cells. These beef catechumen the bulk of ablaze acuteness accustomed into a agnate electric charge, which can again be abstinent (see Figure 2).

CCD_BLA Figure 2 The aggregate of these two components, a collimated ablaze axle and a CCD, accomplish up the foundation of a accepted laser micrometer. The collimated ablaze beam, which consists of a constant ablaze band, is directed at the CCD, which consists of hundreds oflpg gas sensor tiny light-sensitive cells. With this configuration, even a slight change in an article (e.g., its diameter, height, position, etc.) causes a change in the object’s agnate adumbration that is projected assimilate the CCD. This slight change can again be measured.


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