A digital display ruler and its measuring method

Abstract

The invention relates to the technical field of a displacement measurement tool, and particularly to a digital displaying scale and a measurement method thereof. The digital displaying scale comprises a housing, a measuring tape box which is mounted in the housing, and a measuring tape which is coiled in the measuring tape box. The housing is internally provided with sensors. One surface, which faces the sensors, of the measuring tape is provided with a plurality of bright layers and dark layers which are successively separated. The housing is internally provided with a system host which is connected with the sensor. In measurement, the measuring tape is pulled out and the sensor senses the bright layers and the dark layers on the measuring tape for obtaining a sine wave signal and transmitting the sine wave signal to the system host. The system host is provided with an analog-to-digital conversion circuit and a calculating module. The analog-to-digital conversion circuit performs analog-to-digital conversion on the sine wave signal for obtaining a pulse signal. The calculating module counts the pulse signals and digitally displays a length measurement result. The digital displaying scale has advantages of simple structure and low cost. Furthermore n sensors can be flexibly placed in the digital displaying scale. The digital displaying scale and the measurement method thereof simply and effectively settle a contradiction between product cost and high precision requirement.

Description

technical field [0001] The invention relates to the technical field of displacement measurement tools, in particular to a digital displacement measurement device. Background technique [0002] At present, displacement measurement is widely used as a common measurement quantity. For example, in some occasions, grating scales, magnetic scales, and laser ranging are used for displacement measurement. The above technologies have high requirements on materials, so that the cost remains high. . Along with the development of sensor and digital processing technology, someone proposes a kind of digital ruler, the electronic tape measure with digital display or digital interface can be used for measuring, recording length, and can upload measurement data through digital interface, but prior art The digital display ruler still has some defects and deficiencies: [0003] 1. The existing conventional digital length measurement technology has high cost; [0004] 2. Existing digital tap...

AI Technical Summary

Problems solved by technology

[0003] 1. The existing conventional digital length measurement technology has high cost;

[0004] 2. Existing digital tapes mostly use the principle of rotary encoders. Due to the influence of structural technology, processing accuracy and cost, there will be measurement errors between the angular displacement measured by the rotary encoder and the actual linear displacement calculated by theory due to various reasons. ;

[0005] 3. Some digital tape measures adopt the principle of light linear projection / reception, and need to punch holes on the surface of the steel tape, which increases manufacturing costs and is easily affected by dust interference

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