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JPS61111100

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DESCRIPTION JPS61111100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
optical sensor device for converting physical conditions such as pressure and vibration into
optical signals. 2. Related Art In recent years, optical sensors have been applied to many devices
and systems for measurement, monitoring and inspection. As the prior art, for example, Ieudy et
al. "Opt, and La5er TechJVot, 8, 43. P, 117. 1976 ░. Hereinafter, an example of the abovementioned conventional optical sensor device will be described with reference to the drawings.
FIG. 2 shows the structure of a conventional light sensor device. In FIG. 2, 1 is a laser, 2 is a beam
splitter, and 6 is an output terminal of the light detector 6. A indicates an external physical state,
which is pressure here. B is the light emitted from the laser 1 and C is the feedback light, which is
an optical signal converted by the light conversion element 4. The operation of the light sensor
device configured as described above will be described below. First, the light B emitted from the
laser 1 is guided to the liquid crystal 4 through the beam splitter 2 and the optical fiber 3. Due to
the pressure A, the transmittance or reflectance of the liquid crystal 4 provided at the tip of the
light 7 fiber 3 changes. This is a phenomenon that occurs because the refractive index changes
due to the anisotropy of the molecules of the liquid crystal 4. Therefore, the intensity change of
the light corresponding to the change of the external pressure A becomes the feedback light C, is
photoelectrically changed by the light detector 5 through the optical fiber 3 and the beam
splitter 2, and is detected from the output terminal 6 as the output signal. Ru. Problems to be
Solved by the Invention However, in the configuration as described above, information of only
one sensor can be obtained by one laser. Furthermore, one sensor has a problem that the
detection range of the narrow band can not be expected because the range of pressure detection
is limited, and in particular, development of a sensor capable of pressure detection of a wide
band is desired. SUMMARY OF THE INVENTION In view of the above problems, the present
invention provides an optical sensor device capable of pressure detection over a wide band.
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Means for Solving the Problems In order to solve the above problems, the optical sensor device
of the present invention has a central portion in the longitudinal direction of two 7 fibers that
splits laser light or combines return light from two sensors. An X-shaped optical fiber branch
coupler having four optical seven-fiber ends coupled with individual cores is used. That is, based
on the central portion of the optical fiber branch coupler, the first. The fourth optical fiber end is
the second one. A laser provided at the first optical fiber end of the optical fiber branch coupler
opposite to the third optical fiber end;
A sensor provided at the end of the third optical fiber for converting the physical state into light,
and a light detection for converting the feedback light of the sensor into an electrical signal at
the end of the fourth optical fiber and division of the electrical signals of the two sensors And the
filter to be Operation According to the present invention, the information of two sensors can be
obtained with one laser by the above-described configuration. Therefore, wide band information
can be obtained by combining sensors of different frequency bands. EXAMPLE An optical sensor
device according to an example of the present invention will be described with reference to the
drawings. FIG. 1 shows the structure of an optical sensor device according to an embodiment of
the present invention. In FIG. 1, 1 ░ is an isolator for preventing feedback light to the laser 1, 11
is a first sensor, 11a is a film for receiving and capturing the first sensor 11, 12 is a second
sensor, and 12a is a second sensor. The receiving vibrating membrane of the second sensor 12
has a diameter larger than that of the receiving vibrating membrane 11a. 13 is an optical fiber
branch coupler, 3a, 3b, 3c and 3d are first branched from the optical fiber branch coupler 13.
2nd. The third ? fourth optical fiber, 14 is a filter, D is a feedback light of the sensor 11, E is a
feedback light of the sensor 12, F is an output light obtained by combining the feedback light and
E. Reference numeral 1 is a laser, 6 is a light detector, 6 is an output terminal, A is pressure, B is
output light, and these are the same as the conventional configuration. The operation of the light
sensor device configured as described above will be described below with reference to FIG. FIG. 1
shows the configuration of an optical sensor device, and an isolator 10 for preventing return
light B from the laser 1 from returning to the laser 1 and a first optical fiber of an optical fiber
branching coupler 13 (hereinafter referred to as It is simply referred to as the first optical fiber.
In the same manner, the second to third 3.sup. The fourth fiber simply the second fiber. The first
sensor 11 is branched into a second optical fiber 3b and a third optical fiber 3C in the optical
fiber branching coupler 13 via a third optical fiber and a fourth optical fiber 3a. It is led to the
second sensor 12. The laser light of% of the outgoing light B guided to the sensor 11 causes
repeated reflection interference between the end of the second optical fiber 3 b and the
semitransparent sound-receiving diaphragm 11 a. The feedback light subjected to repetitive
reflection interference propagates again through the second optical fiber 3b. The second sensor
12 operates in the same manner, and the feedback light E repeatedly reflected and interfered
between the end of the third optical fiber 3C and the sound receiving vibrating membrane 12a
propagates again through the third optical fiber 3C. The output light F is combined with the
feedback light by the fiber branch coupler 13 and is guided to the light detector 5 through the
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fourth optical fiber 3d and converted into an electrical signal.
The obtained electrical signal is divided by the filter 14 according to the application, and the
divided output signal is obtained from the output terminal 6. The light amount of the feedback
light and E is determined by the ratio of the intensity Ii of the incident light to the intensity Ir of
the reflected light, that is, the intensity reflection coefficient, and can be expressed by the
following equation. {Circle over (1)}, (1-r2) +, * r2.5 in 2 (? / 2) where ? = 4?nQd cos (X) / ?d
= dQ + ?dr: optical fiber end, amplitude reflection coefficient of the receiving diaphragm no: of
air Refractive index do: distance between the end of the optical fiber and the receiving vibrating
membrane ?d: displacement of the receiving vibrating membrane X: refraction angle ? from the
end of the optical fiber to air: incident wavelength. Now, when the incident wavelength is 830
nm, coating is performed on quartz glass, the same amplitude reflectance r as the end of the
optical fiber is made the same, and do is set optimally, the intensity reflection coefficient changes
according to the value of d according to equation 1. That is, it can be seen that the change is
caused by ?d. Generally, as the diameter of the vibrating film increases, the resonance frequency
decreases, and low-frequency pressure can be detected. On the other hand, it is well known that
high frequency pressure can not be detected. Similarly, as the vibrating membrane becomes
smaller, the resonance frequency becomes higher, and the pressure of high frequency can be
detected. On the other hand, it is also well known that low frequency pressure can not be
detected. Therefore, a wide frequency band can be obtained by combining the large and small
vibrating membrane diameters. As described above, according to the present embodiment, the
second optical fiber 3b of the optical fiber branch coupler 13 has the diameter of the sound
receiving diaphragm 11a of the third optical fiber 3C provided with the diameter of the sound
receiving diaphragm 12a. By providing the sensor 11 smaller than the diameter, a wide band
pressure can be detected. In the present embodiment, the sensor 11 and the sensor 12 detect
pressure, but may be an optical sensor that detects different types of vibration, flow velocity, and
the like. Also, different types of sensors may be combined. As described above, according to the
present invention, the optical fiber branch coupler enables pressure detection over a wide band
because one laser can detect different pressures in 1.2 frequency bands, and the frequency is
divided by a filter. It is also possible to distinguish Senna information because it can.
Furthermore, one laser can be used for two sennas, which can be configured inexpensively.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a block diagram of an optical sensor device according to an embodiment of the present
invention, and FIG. 2 is a block diagram of a conventional optical sensor device.
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Attorney Nakao Toshio and 1 other person Figure 1? The second Hase Hajime-Expenses first
section Figure 2! -Check. 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 3 ░ optical fiber. 4
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