Caliper


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Caliper: micrometer caliper

calliper

(US), caliper
1. an instrument for measuring internal or external dimensions, consisting of two steel legs hinged together
2. Med a splint consisting of two metal rods with straps attached, for supporting or exerting tension on the leg

Caliper

 

a device that is lowered into a bore hole on a cable to determine the diameter of the hole. Mechanical and ultrasonic calipers are used.

The most commonly used mechanical caliper consists of three or four lever feelers (probes), which are pressed against the walls of the bore hole by springs, and a rheostat whose sliding contact is connected to the feelers by means of pushrods. A change in the diameter of the borehole produces a proportional change in the resistance of the rheostat. This resistance is measured on the surface and, as a result, a curve is produced showing the change in the diameter of the borehole from the face to the mouth of the hole. Recent models are equipped with a controlled lever device that can be opened and closed repeatedly on command from the surface.

An ultrasonic caliper is a hydrolocating device with two directional electroacoustic transducers located on opposite sides of the borehole instrument. Each transducer operates alternately as an ultrasonic oscillation emitter and detector. The time interval between the moments of the transducer’s emission and its reception of the ultrasonic pulse reflected from the wall of the borehole is measured on the surface. Since the interval is proportional to the distance from the device to the borehole wall, two longitudinal profiles of the borehole are produced, characterizing its diameter.

Since the cross section of a borehole is usually noncircular, instruments have been developed that permit measurement of the size and shape of the cross section.

V. T. CHUKIN

caliper

[′kal·ə·pər]
(design engineering)
An instrument with two legs or jaws that can be adjusted for measuring linear dimensions, thickness, or diameter.

caliper

caliper
An instrument, resembling a pair of dividers, with adjustable legs for measuring the diameter or the thickness of bodies. Also see inside caliper and outside caliper.
References in periodicals archive ?
The only downside, if you could call it that, is you'll probably end up dedicating one caliper to group measurements only, but with stainless steel digital calipers selling for less than $40, it's a worthwhile investment in tooling.
As Giulio says, "The mechanical parts can never be perfectly rigid, so there is a little backlash due to the structure of the telescope and the settling of the caliper under load.
Next, remove the caliper bracket so you can replace the rotor.
Caliper, which develops laboratory instruments and technologies used by life science researchers, has about 465 employees and earned $4.
Extending the temperature capabilities of previously available PAG-based caliper-pin grease, new Molykote G-3407 Caliper Pin Grease offers these key features and advantages like
This is further complicated by a persistent problem that's been found in every CALiPER round: a disparity between performance and manufacturer claims.
Caliper Life Sciences is a premier provider of cutting-edge technologies enabling researchers in the life sciences industry to create life-saving and enhancing medicines and diagnostic tests more quickly and efficiently.
For racing applications, caliper designs must be optimized to provide maximum performance for stiffness, fluid displacement, deflection, and pad wear/taper.
Under the cross-license arrangement, Caliper and AntiCancer will share in any revenues generated by the licensing of their proprietary imaging technologies in the field of fluorescent protein imaging.
Caliper Life Sciences is a premier provider of leading-edge technologies enabling researchers in the life sciences industry to create life-saving and enhancing medicines and diagnostic tests more quickly and efficiently.
The OZII Camera with Laser Diode Measurement System combines the latest laser beam technology with an advanced digital video caliper for precise measurement of pipe joints, cracks, defects, debris and other abnormalities within the pipeline without entering the pipeline.
Our customers have confidence in this technology so it was a natural fit to work with Caliper to offer an integrated solution.