Fiber distance measurement device with high sensitivity

Abstract

The invention relates to the technical field of fiber sensing distance measurement and particularly relates to a fiber distance measurement device with high sensitivity. The device is composed of a first laser device, a second laser device, a first condensing collimating lens, an imaging lens, a second condensing collimating lens, a first sending fiber, a second sending fiber, a first receiving fiber, a second receiving fiber, a filtering spectroscope, a second photoelectric receiver and a first photoelectric receiver. The first laser device and the second laser device subjected to frequency modulation emit lasers with similar wavelengths respectively, the lasers enter the first sending fiber and the second sending fiber through the first collimating focusing lens and the second collimating focusing lens respectively, the light emitted by the first sending fiber is totally transmitted through the filtering spectroscope, the light emitted by the second sending fiber is totally reflectedby the filtering spectroscope, the transmission light and the reflection light are emitted to a measured object through the imaging lens, are reflected by the measured object, return along the same path and are respectively received by the first photoelectric receiver and the second photoelectric receiver, and end faces of the first transmitting fiber and the second transmitting fiber are imagedby the imaging lens in front of the measured object.

Description

Technical field: [0001] The invention relates to the technical field of optical fiber sensing and ranging, in particular to an optical fiber ranging device with high sensitivity. Background technique: [0002] With the rapid development of optical fiber technology, the theory of optical fiber is continuously deepened, and the manufacturing process of optical fiber is becoming more and more perfect. Because optical fiber has the advantages of low loss, small size, light weight, low cost, waterproof, fireproof, corrosion resistance, anti-electromagnetic interference, etc., optical fiber sensors have advantages that traditional sensors cannot match. At present, nearly a hundred sensors for measuring physical quantities such as displacement, magnetic field, electric field, voltage, temperature, sound field, and flow have been developed. The invention realizes the measurement of the displacement of the measured object. [0003] At present, the sensors for displacement measureme...

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Problems solved by technology

[0007] The invention proposes a high-sensitivity optical fiber ranging device to overcome the problems of large errors and low measurement accuracy in the prior art

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