JPH03257374A - Composite type photosensor for measuring acceleration and temperature - Google Patents

Abstract

PURPOSE:To measure two sorts of information on temperature and acceleration by one sensor by a method wherein a temperature detecting element having temperature dependence is provided on the lateral side of a half mirror, an incident light from an optical fiber is halved by the half mirror and the acceleration and the temperature are detected therefrom. CONSTITUTION:50% of a light emitted from an optical fiber 1 is transmitted, as it is, to glass 10 by a half mirror 11 and turns to be an incident light on an acceleration sensor. A light reflected by a reflecting mirror 6 and an excitation light emitted by a light-emitting substance 2 are transmitted by 50% by the mirror 11 and enters an end face of the fiber 1. 50% of the light emitted from the fiber 1 is changed in the direction of advance by an angle of 90 deg. by the mirror 11, becomes an incident light on a temperature sensor and excites a fluorescent substance 8. A light having information on temperature is emitted from the fluorescent substance 8 and 50% of the light is made to enter the end face of the fiber 1 by the mirror 11.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a composite optical sensor that can simultaneously measure temperature and acceleration.

"Prior Art" A conventional optical sensor using an optical fiber obtains one piece of information for incident light from one optical fiber. Here, a conventional sales speed sensor and light temperature sensor will be explained.

Figure 2 shows the bottom of the tank for the selling speed sensor. In the figure, light incident from an optical fiber 1 is converted into a parallel beam by a rod lens 3, is irradiated onto a vibrating beam element 5, and is reflected by a mirror on the vibrating beam element 5. The reflected light is focused by the rod lens 3 on the end face of the fiber.

When acceleration is applied, the focal point moves in accordance with the angular displacement of the vibrating beam element 5 due to the action of the spring. This changes the amount of optical input signal to the fiber, which represents acceleration information.

The incident light from the optical fiber 1 illuminates the luminescent substance 2,
The luminescent material 2 emits excitation light and re-enters the optical fiber. This excitation light is a reference signal that compensates for losses due to fibers and connectors.

Fig. 3 shows a description of the optical temperature sensor.

Light incident from the optical fiber 7 illuminates the phosphor 8, and the phosphor 8 excites light having a wavelength completely different from that of the incident light. Since the wavelength of this excitation light changes depending on the temperature, it has temperature information.

"Problem to be Solved by the Invention" In the conventional configuration, one sensor measures one piece of information such as acceleration and temperature.

"Means for Solving the Problems" The present invention realizes a sensor that obtains reflected light having two pieces of information, acceleration and temperature, for incident light through one optical fiber.

"Operation" The incident light from one optical fiber is separated by 50% by a half mirror, each light enters an acceleration sensor and a temperature sensor, and the light with acceleration and temperature information passes through the half mirror again. This is a composite optical sensor that has the function of re-injecting light into an optical fiber.

"Example" An embodiment of the present invention will be described with reference to FIG.

50% of the light emitted from the optical fiber 1 is transmitted through the half mirror 11 as it is, reaches the glass 10, and becomes incident light on the acceleration sensor.

50% of the light reflected by the reflection mirror 6 and the excitation light emitted by the luminescent substance 2 is transmitted by the half mirror 1,
The light is incident on the end face of the optical fiber 1.

50% of the light emitted from the optical fiber 1 changes its traveling direction by 90 degrees by the half mirror 11, becomes incident light on the temperature sensor, excites the phosphor 8, and the phosphor 8 emits light having temperature information. The light is emitted, and 50% of it is incident on the end face of the optical fiber by the half mirror.

"Effects of the Invention" According to the present invention, a sensor having two pieces of information, temperature and acceleration, can be realized using one sensor.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the present invention in detail. FIG. 2 is a diagram for explaining a conventional acceleration sensor, and FIG. 3 is a diagram for explaining a conventional optical temperature sensor. 1: Optical fiber 2: Luminescent substance 3; Lens 4; Glass 5: Vibrating beam element 6: Reflection mirror 7; Optical fiber 8: Phosphor 9: Protective material 10 Nigelas 11: Half mirror

Claims (1)

[Claims] An optical fiber, a half mirror optically coupled to the optical fiber, and an acceleration detecting section consisting of a reflective mirror, a cantilever, a lens, and a luminescent substance on the tip surface of the half mirror, and a temperature-dependent sensor on the side surface of the half mirror. A half mirror is used to split the incident light from one optical fiber, which includes a temperature detection part made of a fluorescent substance with a characteristic, into two parts, and the light enters the acceleration detection part and temperature detection part, respectively, to detect acceleration and temperature. A composite optical sensor for acceleration temperature measurement.