Caliper

Details Caliper Caliper

G - Physics

01

B

33/194

G01B 3/00 (2006.01) G01B 3/20 (2006.01) G01B 7/00 (2006.01) G01D 5/16 (2006.01)

Patent

CA 1113711

ABSTRACT OF THE DISCLOSURE An electronic caliper to read and record the diameter of measured tree trunks. The caliper has a bar with a fixed leg, and a movable leg mounted on the bar. A plurality of spaced- apart grooves are provided along a length of the bar, the bar being magnetic where the grooves are located. The grooves are perpendicular to the bar. A pair of spaced-apart field plates are carried by the movable leg in close cooperation with the grooves. The field plates are out of phase with each other re- lative to the grooves. Means are provided to convert electric signals coming from the plates to pulses. The phase position of the pulses is compared, to determine in which direction the mova- ble leg moved, and the number of pulses are counted up or down depending on the direction of leg movement, in a comparison and scaling circuit. A conversion device converts the number of pul- ses to a readable measurement valve.

320455

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