Optical fiber sensor

Abstract

An optical fiber sensor (8) has an optical fiber (2) and, a light emitting member (3) connected to a first end (20) of the optical fiber (2), a light receiving member (4) connected to a second end (21) of the optical fiber (2). The light emitting member (3) has a light emitting portion (300) through which light is radiated to the first end (20) of the optical fiber (2). The light receiving member (4) has a light receiving portion (400) for receiving light radiated from the second end (21) of the optical fiber (2). The light emitting portion (300) is smaller than a sectional area of a core portion (25) of the optical fiber (2).

Description

technical field [0001] The invention relates to fiber optic sensors with optical fibers. Background technique [0002] In recent years, vehicles have been required to improve not only the safety of passengers but also the safety of pedestrians colliding with the vehicles. It is known to provide pedestrian protection devices on vehicles for reducing injury to pedestrians who may fall onto the hood of the vehicle as a result of a collision. In pedestrian protection devices, it is important to determine the collision of pedestrians. As one of the ways of detecting pedestrian collision, it is known to use a collision detection sensor with an optical fiber sensor. This collision detection sensor is attached to, for example, a bumper of a vehicle. [0003] Fiber optic sensors detect stress applied to an optical fiber based on changes in the light transmitted in the optical fiber. Generally, an optical fiber is deformed by external stress, and the light transmission characteris...

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Problems solved by technology

This interface reflection also results in loss of light

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