JP6682096B2 - Sensor device - Google Patents

Description

  The present invention relates to a sensor device that detects expansion and contraction of a surface to be measured along a surface.

  In recent years, there has been a demand for a sensor device capable of detecting the expansion / contraction state of a measurement target surface, which causes expansion / contraction in the direction along the surface, such as the surface of human skin.

  On the other hand, as a sensor device capable of detecting the surface shape of the surface to be measured, there is conventionally known a sensor device disclosed in, for example, Patent Document 1. The sensor device disclosed in Patent Document 1 includes an optical fiber fixed or mixed in a flat plate-like body such as a sheet, and the flat plate-like body is perpendicular to the plane by measuring the polarization fluctuation in the optical fiber. The uneven deformation of the flat body due to the directional force is detected.

JP, 2007-61306, A

  However, the sensor device disclosed in Patent Document 1 detects the uneven deformation of the flat body due to the force in the direction perpendicular to the surface of the flat body, by measuring the polarization fluctuation in the optical fiber. Although it is possible to do so, it is difficult to detect the expansion and contraction of the measurement target surface with respect to the measurement target surface that expands and contracts in the direction along the surface without causing uneven deformation.

  The present invention has been made in view of the above background, and an object of the present invention is to provide an optical fiber type sensor device capable of appropriately detecting expansion and contraction of a measurement target surface that expands and contracts in a direction along the surface.

  Another object of the present invention is to provide a sensor device capable of detecting the movement of a human joint by detecting the expansion and contraction of the human skin surface.

In order to achieve the above-mentioned object, the optical fiber type sensor device of the present invention is an expandable sheet member that is mounted on a measurement target surface that expands and contracts in a direction along the surface so as to expand and contract as the measurement target surface expands and contracts. And an optical fiber having a fixed portion arranged along the surface of the sheet member and fixed to the sheet member, wherein the fixed portion of the optical fiber is in the direction along the surface of the sheet member. The optical fiber includes a bending portion that is bent so that the bending degree changes according to expansion and contraction, and the optical fiber is basically configured to change the optical transmission characteristic according to the change in the bending degree of the bending portion. The configuration. More specifically, the optical fiber type sensor device of the present invention includes an expandable sheet member mounted on a measurement target surface that expands and contracts in a direction along the surface so as to expand and contract with the expansion and contraction of the measurement target surface, and the sheet. An optical fiber having a fixed portion arranged along the surface of the member and fixed to the sheet member, wherein the fixed portion of the optical fiber is responsive to expansion and contraction along the surface of the sheet member. The bending portion includes a bending portion that is bent so that the bending degree changes, and the bending degree of the bending portion decreases in accordance with the extension of the sheet member in a predetermined first direction, and is orthogonal to the first direction. The optical fiber is arranged so that the degree of bending of the bending portion increases in accordance with the extension of the sheet member in the second direction, and the optical fiber has the bend associated with the extension of the sheet member in the second direction. To increase the degree of curvature of the part Accordingly, the transmission loss of light is increased, and the transmission loss of light is reduced in accordance with the decrease in the degree of bending of the bending portion accompanying the extension of the sheet member in the first direction. the constitution (first invention).

According to the first aspect of the present invention, by mounting the sheet member on the measurement target surface, the expansion and contraction of the measurement target surface is transmitted to the sheet member, and the sheet member expands and contracts. The bending degree of the bending portion included in the fixed portion changes. Further, the light transmission loss of the optical fiber changes according to the change in the degree of bending of the bending portion . Specifically, the transmission loss of light increases as the degree of bending of the bending portion increases, and the transmission loss of light decreases as the bending degree of the bending portion decreases.

Therefore, the expansion and contraction of the measurement target surface can be detected by measuring the change in the transmission loss of the light of the optical fiber with the sheet member attached to the measurement target surface.

  In this case, the sheet member may be a thin and flexible sheet member as long as it can be attached to the measurement target surface so as to expand and contract as the measurement target surface expands and contracts. For this reason, the sheet member can be expanded and contracted to various measurement target surfaces without being restricted by the shape of the measurement target surface and the like with a high followability with respect to expansion and contraction in the direction along the surface of the measurement target surface. Can be installed.

  In addition, since the optical fiber can easily change the degree of curvature, by fixing the fixed portion of the optical fiber to the sheet member with an appropriate arrangement pattern, the degree of curvature of the curved portion of the optical fiber is It is possible to change the expansion and contraction of the sheet member 2 with high followability.

  Therefore, according to the optical fiber type sensor device of the first invention, it is possible to appropriately detect the expansion and contraction of various measurement target surfaces that expand and contract in the direction along the surface.

In the first aspect of the invention, in the fixed portion of the optical fiber, the bending degree of the bending portion is reduced in accordance with the extension of the sheet member in the predetermined first direction, and the fixing portion of the optical fiber is orthogonal to the first direction. The bending degree of the bending portion increases in accordance with the extension of the sheet member in the direction . Then, in the optical fiber, the transmission loss of light increases in accordance with the increase in the degree of bending of the bending portion accompanying the extension of the sheet member in the second direction, and the sheet member in the first direction. The transmission loss of light is reduced in accordance with the decrease in the degree of bending of the bending portion due to the extension of the .

Therefore , the expansion and contraction of the measurement target surface can be detected in both the first direction and the second direction. Furthermore, in the case of extension of the sheet member in the first direction, in the case of extension of the sheet member in the second direction, with the direction of change in the degree of curve of the curved portion (increase or decrease of the bending degree) are different , The direction of change in optical transmission loss (increase or decrease in transmission loss) is different. Therefore, based on the measured value of the transmission loss of light, the expansion and contraction of the measurement target surface in the first direction and the expansion and contraction of the measurement target surface in the second direction can be detected separately.

In the first invention, it is preferable that the fixed portion of the optical fiber is arranged so as not to have a portion that linearly extends in each of the first direction and the second direction ( second invention). ).

  Here, since the optical fiber generally has high rigidity against expansion and contraction, if the fixed portion fixed to the sheet member has a linearly extending portion, the sheet in the extending direction of the linearly extending portion is Expansion and contraction of the member is likely to be hindered.

However, according to the second invention, the expansion and contraction of the first and second directions of the sheet member in each direction, thus, the expansion and contraction of the object surface can be prevented from being inhibited by the fixed portion of the optical fiber. Therefore, in either of the first direction and the second direction, it is possible to favorably secure the sensitivity of the change in the bending degree of the bending portion with respect to the expansion and contraction of the measurement target surface.

In addition , in the basic configuration , the fixed portion of the optical fiber may be arranged such that the bending degree of the bending portion changes according to expansion and contraction of the sheet member in at least one direction. In this case, it is preferable that the fixed portion of the optical fiber is arranged so as not to have a portion that linearly extends in the one direction ( reference invention).

According to this, it is possible to favorably secure the sensitivity of the change in the bending degree of the bending portion to the expansion and contraction of the measurement target surface in the one direction.

In the first invention, the second invention, or the reference invention , the entire fixed portion of the optical fiber, or the entire fixed portion excluding both ends thereof, has a center of curvature of each portion on both sides of the optical fiber in the fixed portion. A mode in which it is curved so that it exists on one side can be adopted ( third invention).

  The term "both sides of the optical fiber" means two surface areas which are divided by the fixed portion of the optical fiber as a boundary line on the surface on which the fixed portion of the optical fiber is arranged.

According to the third aspect of the invention, the bending direction of the entire fixed portion of the optical fiber or the whole of the fixed portion excluding both ends thereof is uniform. Can be appropriately changed with a smooth and simple arrangement pattern of the fixed portion.

In the third aspect of the present invention, the entire fixed portion of the optical fiber, or the entire fixed portion excluding both end portions is curved in a loop-shaped curved shape or a convex curved-shaped pattern, for example. Can be adopted ( 4th invention).

  The loop-shaped curved shape may be, for example, a circular shape, an elliptical shape, or the like, and the convex-shaped curved shape may be, for example, a semicircular shape, a semielliptic shape, a parabolic shape, or a half cycle of a sine wave. Etc. can be adopted.

According to the fourth aspect of the invention, it is possible to easily realize an arrangement pattern of the fixed portion that can appropriately change the bending degree of the bending portion according to the expansion and contraction of the sheet member.

In the third invention or the fourth invention, the curved portion is provided at a central portion in the longitudinal direction of the fixed portion of the optical fiber, and the entire fixed portion of the optical fiber or both end portions of the fixed portion is provided. It is preferable that the entire part except the curved portion is curved so that a portion on the one end side of the fixed portion from the curved portion and a portion on the other end side of the fixed portion from the curved portion have a symmetrical shape ( fifth aspect of the invention). ).

According to this, it is possible to suitably increase the sensitivity of the change in the bending degree of the bending portion to the expansion and contraction of the sheet member in the tangential direction (or the direction close to this) of the central portion of the bending portion. Incidentally, the upper Symbol tangential, consistent with the first direction or the second direction (or substantially match) it is preferable to.

In the above first to fifth invention, the optical fiber, its curved portion, it is preferable that an optical fiber has a hetero core portion having a smaller diameter core than the core of an optical fiber connected to both sides of the curved portion ( Sixth invention).

  Here, the optical fiber having the hetero core portion is sensitive to the change in the degree of curvature of the hetero core portion, and the transmission loss of light changes. Therefore, in the seventh invention in which the hetero core portion is a curved portion, by measuring the transmission loss of light of the optical fiber, a change in the degree of curvature of the curved portion, and by extension, expansion / contraction of the measurement target surface can be achieved. It can be done well.

In the above first to sixth inventions, as the measurement target surface, a portion of the skin surface of a person that expands and contracts in the direction along the surface according to the movement of the predetermined target joint of the person can be adopted ( 7 invention).

According to the seventh aspect of the present invention, the optical fiber type sensor device of the present invention can indirectly detect the movement (flexion, extension, etc.) of the target joint by detecting the expansion and contraction of the human skin surface. In this case, since the movement of the target joint can be detected without mounting the seat member on the target joint, the natural movement of the target joint can be detected.

Also, sensor devices, a sensor device for detecting movement of a predetermined object joint of the human, of the person's skin surface, resulting in expansion and contraction of the surface along the direction in response to movement of the object joint a portion having a stretchable sheet member which is mounted for telescoping with the expansion and contraction of the skin surface in the partial, that are capable of generating constructed a signal corresponding to the expansion and contraction of the surface along the direction of the sheet member Aspects can be adopted .

According to this , similarly to the seventh aspect of the invention, it is possible to indirectly detect the natural joint of the target joint by detecting the expansion and contraction of the skin surface of a person without the need to attach the sheet member to the target joint. Motion (flexion, extension, etc.) can be detected.

The figure which shows the structure of the optical fiber type sensor apparatus and measurement system of 1st Embodiment of this invention. The disassembled perspective view of the optical fiber type sensor device of 1st Embodiment. The figure which shows the principal part structure of the optical fiber with which the optical fiber type sensor device of 1st Embodiment was equipped. The figure which shows the state which extended the sheet member of the optical fiber type sensor apparatus of 1st Embodiment to the X-axis direction. The figure which shows the state which extended the sheet member of the optical fiber type sensor apparatus of 1st Embodiment to the Y-axis direction. The graph which shows the measurement data of the optical transmission characteristic of an optical fiber when the sheet member of the optical fiber type sensor device of 1st Embodiment is extended. The figure which shows the structure of the optical fiber type sensor device of 2nd Embodiment of this invention. The graph which shows the measurement data of the optical transmission characteristic of an optical fiber when the sheet member of the optical fiber type sensor device of 2nd Embodiment is expanded-contracted. The figure which shows the structure of the optical fiber type sensor device of 3rd Embodiment of this invention. FIG. 10A is a diagram showing a palmar flexion motion of a human wrist joint, and FIG. 10B is a diagram showing a ulnar flexion motion of a human wrist joint. FIG. 11A is a diagram showing an installed state of an optical fiber type sensor device for detecting a flexion motion of a wrist joint, and FIG. 11B is an installed state of an optical fiber type sensor device for detecting a ulnar motion of a wrist joint. Fig. FIG. 12A is a graph showing measurement data of optical transmission characteristics of the optical fiber of the optical fiber type sensor device when the wrist joint is flexed flexibly, and FIG. 12B is an optical fiber type when repeated wrist ulnar flexion operation is repeated. The graph which shows the measurement data of the optical transmission characteristic of the optical fiber of a sensor apparatus.

[First Embodiment]
A first embodiment of the present invention will be described below with reference to FIGS.

  With reference to FIG. 1 and FIG. 2, the optical fiber type sensor device 1 of the present embodiment includes a sheet member 2 and an optical fiber 3.

  The sheet member 2 is a thin sheet member that can elastically expand and contract in the direction along the surface thereof. The sheet member 2 is made of, for example, a polyurethane film. In this embodiment, the sheet member 2 is formed in a two-layer structure by superposing two polyurethane films 2a and 2b (see FIG. 2). In this case, the polyurethane films 2a and 2b are fixed to each other via an appropriate adhesive or the like.

  As described above, the sheet member 2 including the polyurethane films 2a and 2b has high elasticity and flexibility. For this reason, it is possible to easily attach it to an arbitrary surface to be measured such as the surface of human skin so as to be in close contact with it through an appropriate adhesive or the like.

  Further, in the pasted state, the sheet member 2 can expand and contract with high followability along with the expansion and contraction of the surface to be measured along the surface. Further, in particular, when the sheet member 2 is attached to the skin surface of a person, the sheet member 2 can be attached to the skin surface with almost no discomfort such as a feeling of restraint on the person. .

  The sheet member 2 is not limited to the one having a two-layer structure, and may have a single layer or three or more layers. The sheet member 2 may be made of a material other than polyurethane, such as silicone rubber. Alternatively, the sheet member 2 may be made of a stretchable cloth.

  In the present embodiment, as shown in FIG. 3, the optical fiber 3 is an optical fiber having a hetero core portion 3a having a predetermined length (for example, several mm) in the middle of its entire length. The hetero core portion 3a has a smaller diameter than the core 3b1 of each of the optical fibers 3b and 3b (hereinafter, the optical fiber 3b is referred to as a transmission line optical fiber 3b) forming an optical transmission line connected to both sides in the axial direction. This is a portion having the core 3a1.

  Incidentally, around the core 3a1 of the hetero core portion 3a and around the core 3b1 of each transmission line optical fiber 3b, claddings 3a2 and 3b2 having a constant outer diameter are formed, respectively, similarly to a normal optical fiber. . Further, the optical fiber forming the hetero core part 3a and each transmission line optical fiber 3b may be either a single mode optical fiber or a multimode optical fiber.

  The optical fiber 3 having the hetero core portion 3a as described above (hereinafter referred to as the hetero core optical fiber 3) has, for example, a core diameter larger than that of the optical fiber forming the hetero core portion 3a on both end faces in the axial direction. It can be manufactured by joining the transmission line optical fibers 3b, 3b to a coaxial core by fusion or the like.

  In such a hetero core optical fiber 3, when light is incident from one side of the transmission path optical fibers 3b and 3b, a part of the light entering from the one side transmission path optical fiber 3b to the hetero core part 3a is a hetero core. It is not transmitted to the transmission path optical fiber 3b on the other side through the core 3a1 of the portion 3a, and leaks to the outside of the hetero core portion 3a. The amount of light leakage in this case has a high correlation with the degree of curvature of the hetero core optical fiber 3 in the hetero core portion 3a, and the higher the degree of curvature, the greater the amount of light leakage.

  Therefore, when the transmission loss of light in the hetero core optical fiber 3 is measured, the transmission loss increases as the degree of curvature of the hetero core optical fiber 3 in the hetero core portion 3a increases.

  Supplementally, although FIG. 3 exemplifies a case where the core diameter of the hetero core portion 3a is constant, the core portion 3a1 is so arranged that the core diameter of the hetero core portion 3a changes in the axial direction of the hetero core portion 3a. May be formed. For example, the core 3a1 may be formed so that the core diameter of the hetero core portion 3a gradually decreases from both ends in the axial direction of the hetero core portion 3a toward the center side.

  Returning to FIG. 1 and FIG. 2, in the optical fiber type sensor device 1 of the present embodiment, a fixed length portion of the hetero core optical fiber 3 including the hetero core portion 3a is a fixed portion 3x to the sheet member 2. . Then, the fixing portion 3x is arranged along the surface of the sheet member 2 inside the peripheral edge of the sheet member 2 and fixed to the sheet member 2 in a state where the hetero core portion 3a is curved. 1 and 2, for convenience of illustration, the hetero core portion 3a of the hetero core optical fiber 3 is indicated by a thin line, and the transmission path optical fiber 3b is indicated by a thick line.

  In this case, the hetero core portion 3a is a portion corresponding to the bending portion in the present invention. The fixed portion 3x including the hetero core portion 3a is arranged along the surface of the sheet member 2 in a shape pattern capable of changing the degree of bending of the hetero core portion 3a, which is a bending portion, according to the expansion and contraction of the sheet member 2 in the direction along the surface. Then, the sheet member 2 is fixed.

  Specifically, in this embodiment, the fixed portion 3x of the hetero core optical fiber 3 has a hetero core portion 3a at the center in the longitudinal direction and is a fixed length portion longer than the hetero core portion 3a. Then, the fixed portion 3x is fixed to the sheet member 2 in a state in which the entire portion (including the hetero core portion 3a) excluding both ends thereof is curved in a loop-shaped curved pattern. In the present embodiment, this loop-shaped curved pattern is, for example, a circular pattern having a constant or substantially constant radius of curvature.

  The fixed portion 3x curved in the circular pattern as described above is arranged between the two polyurethane films 2a and 2b forming the sheet member 2, as shown in FIG. Then, in this state, the fixing portions 3x are fixed to the sheet member 2 by overlapping the polyurethane films 2a and 2b and fixing them to each other.

  As a result, the optical fiber type sensor device 1 of the present embodiment is configured as shown in FIG. In this case, the entire center (circular portion) of the fixed portion 3x excluding both ends has a center of curvature of each portion (a center point of a circle having a radius of curvature) on one side of both sides of the optical fiber 3 of the fixed portion 3x. It is curved in a curved shape so that it exists only (inside of the inside and outside of the circular loop).

  Further, since the hetero core portion 3a is provided at the center of the fixed portion 3x curved in the circular pattern as described above, the hetero core portion 3a to the one end side of the fixed portion 3x of the circular fixed portion 3x. And a portion on the other end side of the fixed portion 3x from the hetero core portion 3a have a symmetrical shape (specifically, the central portion of the hetero core portion 3a is orthogonal to the axial direction of the hetero core portion 3a (see FIG. 1). It is curved in a shape that is line-symmetrical with respect to a straight line that crosses in the (Y-axis direction).

  Further, in the optical fiber sensor device 1 of the present embodiment, the fixed portion 3x of the hetero-core optical fiber 3 has a portion in which the entire fixed portion 3x (or the entire portion excluding both ends) extends linearly. It is fixed to the sheet member 2 in an arrangement pattern that does not exist.

  Note that in FIG. 1, for convenience of illustration, the two polyurethane films 2a and 2b forming the sheet member 2 are regarded as transparent, and the fixed portion 3x of the hetero core optical fiber 3 is illustrated by a solid line.

  Further, in FIG. 1, the X axis indicates a coordinate axis indicating the tangential direction of the central portion of the hetero core portion 3a, and the Y axis indicates the coordinate axis in the direction orthogonal to the X axis. One of these X-axis and Y-axis directions corresponds to the first direction (or one direction) of the present invention, and the other corresponds to the second direction of the present invention.

  Further, φ represents the diameter of the circular pattern of the fixed portion 3x.

  Supplementally, in the example shown in FIG. 1 and FIG. 2, both ends of the fixed portion 3x of the hetero core optical fiber 3 are arranged so as to cross each other. However, for example, the fixed portions 3x may be arranged such that a slight gap is formed between the both ends of the fixed portion 3x without intersecting the both ends thereof.

  Further, the whole of the fixed portion 3x including both end portions may be curved so that the center of curvature exists only on one side of both sides of the optical fiber 3 of the fixed portion 3x.

  The form in which the fixed portion 3x of the hetero core optical fiber 3 is fixed to the sheet member 2 is not limited to the above form. For example, the fixed portion 3x may be fixed to the surface of the sheet member 2 with an appropriate adhesive or pressure-sensitive adhesive.

  In the optical fiber type sensor device 1 configured as described above, since the fixed portion 3x of the hetero core optical fiber 3 is fixed to the sheet member 2 in a circular pattern, expansion and contraction in the direction along the surface of the sheet member 2 is prevented. Accordingly, the degree of bending of the hetero core portion 3a as the bending portion included in the fixed portion 3x changes.

  For example, when the sheet member 2 is stretched by pulling in the X-axis direction (the tangential direction of the central portion of the hetero core portion 3a) as indicated by the white arrow in FIG. 4, the shape pattern of the fixed portion 3x changes from a circular shape. The shape changes to an elliptical shape (or a shape close to it) that is long in the X-axis direction. Therefore, the degree of curvature of the hetero core portion 3a is reduced (the average curvature is reduced).

  Further, for example, as shown by an outline arrow in FIG. 5, when the sheet member 2 is stretched by pulling in the Y-axis direction (direction orthogonal to the tangential direction of the central portion of the hetero core portion 3a), the shape of the fixed portion 3x Changes from a circular shape to an elliptical shape (or a shape close to it) that is long in the Y-axis direction. Therefore, the degree of curvature of the hetero core portion 3a is increased (the average curvature is increased).

  Therefore, when the sheet member 2 is attached to an arbitrary measurement target surface that expands and contracts in the direction along the surface, the degree of curvature of the hetero core portion 3a changes according to the expansion and contraction of the sheet member 2 accompanying the expansion and contraction of the measurement target surface. Becomes Further, the expansion of the sheet member 2 in the case of the expansion and contraction of the sheet member 2 in the X-axis direction (or a direction close thereto) and the expansion and contraction of the sheet member 2 in the Y-axis direction (or a direction close to this). The directions of change in the degree of curvature of the hetero core portion 3a with respect to the increase in the amount (increase or decrease in the degree of curvature) are different from each other.

  In addition, in the optical fiber type sensor device 1 of the present embodiment, as described above, the entire fixed portion 3x of the hetero core optical fiber 3 is fixed to the sheet member 2 in an arrangement pattern having no linearly extending portion. ing.

  For this reason, in both the X-axis direction and the Y-axis direction, the expansion and contraction along the surface of the sheet member 2 is less likely to be hindered by the hetero-core optical fiber 3 having extremely low elasticity (high rigidity against expansion and contraction). ing. As a result, when the sheet member 2 is attached to an arbitrary measurement target surface that expands and contracts in the direction along the surface, the expansion and contraction of the sheet member 2 accompanying the expansion and contraction of the measurement target surface can be smoothly performed with high followability.

  Further, since the shape pattern of the fixed portion 3x of the hetero core optical fiber 3 is a circular pattern, both ends of the fixed portion 3x are close to each other at the peripheral edge of the sheet member 2. Therefore, it is possible to easily arrange the two transmission line optical fibers 3b, 3b, which extend from the both ends of the fixed portion 3x to the outside of the sheet member 2, in close proximity to each other. Thus, it becomes easy to handle the two transmission path optical fibers 3b and 3b.

  Next, a measurement method for detecting expansion and contraction of an arbitrary measurement target surface using the optical fiber type sensor device 1 will be described with reference to FIG.

  The sheet member 2 is attached to the measurement target surface so that the measurement target surface (not shown) expands and contracts. In this case, the attachment of the sheet member 2 to the measurement target surface is performed by, for example, attaching the sheet member 2 to the measurement target surface via an appropriate pressure sensitive adhesive or adhesive. Then, for example, the measurement is performed by using the measurement system 10 as shown in FIG. 1 to detect the expansion and contraction of the measurement target surface.

  The measurement system 10 includes a light source 11 that outputs light incident on the heterocore optical fiber 3, a photodetector 12 that receives light emitted from the heterocore optical fiber 3, and an AD converter (not shown) for the output of the photodetector 12. And a data processing device 13 that captures the data via the.

  The light source 11 is composed of, for example, a light emitting diode (LED), a laser diode (LD), etc., and is connected to one end of the transmission path optical fibers 3b, 3b of the hetero core optical fiber 3.

  The photodetector 12 is composed of, for example, a photodiode (PD) or the like, and is connected to the other end of the transmission path optical fibers 3b, 3b of the hetero core optical fiber 3.

  The data processing device 13 is composed of, for example, a computer such as a personal computer or an electronic circuit unit including a CPU and the like.

  Light is incident on the hetero core optical fiber 3 from the light source 11 of the measurement system 10 having such a configuration, and the light emitted from the hetero core optical fiber 3 is detected by the photodetector 12.

  Then, the data processing device 13 measures the intensity of the emitted light indicated by the output of the photodetector 12, and the ratio of the measured value of the intensity of the emitted light and the predetermined intensity of the incident light is used as an index value, The transmission loss of light in the hetero core optical fiber 3 (hereinafter, simply referred to as optical loss) is measured. The optical loss of the hetero-core optical fiber 3 increases as the ratio of the intensity of emitted light to the intensity of incident light decreases.

  Here, the shape pattern of the fixed portion 3x of the hetero core optical fiber 3 changes according to the expansion and contraction of the sheet member 2 accompanying the expansion and contraction of the measurement target surface, and thus the degree of curvature of the hetero core portion 3a included in the fixed portion 3x changes. It changes as described above. Then, the amount of light leakage in the hetero core portion 3a changes according to the change in the degree of curvature of the hetero core portion 3a. Therefore, the expansion and contraction of the measurement target surface can be detected based on the measured value of the optical loss of the hetero core optical fiber 3.

  For example, when the sheet member 2 extends in the X-axis direction (or a direction close thereto) as the measurement target surface extends in the X-axis direction (or a direction close thereto), the degree of curvature of the hetero core portion 3a may be increased. Is decreased, the measured value of the optical loss of the hetero core optical fiber 3 is decreased.

  Further, when the sheet member 2 is shortened in the X-axis direction (or a direction close thereto) as the measurement target surface is shortened from the stretched state in the X-axis direction (or a direction close thereto), the hetero core part Since the bending degree of 3a increases, the measured value of the optical loss of the hetero core optical fiber 3 increases.

  Further, for example, when the sheet member 2 extends in the Y-axis direction (or a direction close to this) as the measurement target surface extends in the Y-axis direction (or a direction close to this), the hetero core part 3 a Since the degree of bending increases, the measured value of the optical loss of the hetero core optical fiber 3 increases.

  Further, when the sheet member 2 is shortened in the Y-axis direction (or a direction close thereto) as the measurement target surface is shortened from the stretched state in the Y-axis direction (or a direction close thereto), the hetero core portion Since the degree of bending of 3a decreases, the measured value of the optical loss of the hetero core optical fiber 3 decreases.

  Therefore, it is possible to detect the expansion or contraction or the expansion or contraction degree of the measurement target surface based on the measured value of the optical loss of the hetero core optical fiber 3. In addition, the direction in which the optical loss of the hetero core optical fiber 3 changes (increase or decrease in optical loss) is the same when the sheet member 2 extends in the X-axis direction and when the sheet member 2 extends in the Y-axis direction. Since they are different from each other, it is possible to detect the expansion and contraction of the surface to be measured by distinguishing between expansion and contraction in the X-axis direction and expansion and contraction in the Y-axis direction based on the measured value of the optical loss.

  Next, a verification test of the operation characteristics of the example of the optical fiber type sensor device 1 of the present embodiment will be described with reference to FIG.

  The optical fiber type sensor device 1 of the example was manufactured, and the relationship between the extension amount of the sheet member 2 of the optical fiber type sensor device 1 and the optical loss of the hetero core optical fiber 3 was measured. The specifications of the manufactured optical fiber type sensor device 1 are as follows.

  That is, a single-mode optical fiber having a core diameter of 9 μm and a single-mode optical fiber having a core diameter of 5 μm are used as the optical fibers of the transmission line optical fiber 3b and the hetero-core portion 3a, respectively, and the hetero-core optical structure shown in FIG. Fiber 3 was produced. In this case, the length of the hetero core portion 3a is, for example, 2 mm, and the outer diameters of the claddings 3a2 and 3b2 of the hetero core portion 3a and the transmission line optical fiber 3b are, for example, 125 μm.

  In addition, a square sheet member 2 having a size of 50 × 50 mm was produced using the polyurethane films 2a and 2b having a thickness of 0.025 mm. In this case, the fixed portion 3x of the hetero-core optical fiber 3 was arranged between the polyurethane films 2a and 2b in the circular pattern shown in FIG. The diameter φ of the circular portion of the fixed portion 3x is, for example, 30 mm.

  With respect to the optical fiber type sensor device 1 of the embodiment, the sheet member 2 is pulled and extended in each of the X-axis direction and the Y-axis direction, and a plurality of displacement amounts of the sheet member 2 (extension from the initial state). In (quantity), the optical loss of the hetero core optical fiber 3 was measured using the measurement system 10.

  In this case, both ends of the sheet member 2 in the X-axis direction are fixed to a fixed base and a movable base (not shown), respectively, and the movable base is moved in the X-axis direction with respect to the fixed base, whereby the sheet member 2 is pulled and extended. I was allowed to do it. The same applies to the Y-axis direction.

  FIG. 6 shows measurement data obtained by the verification test. The amount of displacement on the horizontal axis in FIG. 6 represents the amount of expansion of the sheet member 2 from the initial state (the state where the fixed portion 3x of the hetero-core optical fiber 3 is circular), and the relative optical loss on the vertical axis is The relative light loss based on the light loss of the hetero core optical fiber 3 in the initial state of the sheet member 2 is expressed in decibel units.

  In this case, when the value of the relative optical loss is a negative value, the larger the absolute value thereof, the more the optical loss of the hetero core optical fiber 3 decreases, and the value of the optical loss is a positive value. The larger the absolute value, the more the optical loss of the hetero core optical fiber 3 increases.

  As shown in FIG. 6, when the sheet member 2 is extended in the X-axis direction, the greater the amount of extension is, the smaller the degree of bending of the hetero core portion 3a becomes, so that the relative optical loss of the hetero core optical fiber 3 decreases. It can be seen that it decreases monotonically.

  Further, when the sheet member 2 is extended in the Y-axis direction, the greater the amount of extension, the greater the degree of bending of the hetero core portion 3a, and therefore the relative optical loss of the hetero core optical fiber 3 monotonically increases. I understand.

  As described above, according to the optical fiber type sensor device 1 of the first embodiment, the hetero core light is generated regardless of whether the sheet member 2 is extended in the X-axis direction or the Y-axis direction. The optical loss of the fiber 3 monotonously changes (decreases or increases) as the extension amount of the sheet member 2 increases.

  Further, in the case where the sheet member 2 is extended in the X-axis direction and the case where the sheet member 2 is extended in the Y-axis direction, the direction of change in the optical loss of the hetero core optical fiber 3 with respect to the increase in the extension amount of the sheet member 2 (optical Loss decrease or increase) will be different from each other.

  In the measurement data shown in FIG. 6, when the sheet member 2 is extended in the Y-axis direction, the light with respect to the change in the extension amount of the sheet member 2 is larger than when the sheet member 2 is extended in the X-axis direction. The sensitivity of change in loss is small. The reason is considered to be that the bending stress was difficult to act on the hetero core portion 3a when the sheet member 2 was extended in the Y-axis direction due to the bias of the tensile force acting on the sheet member 2.

  Supplementally, in the first embodiment, a circular pattern is adopted as the loop-shaped curved shape of the fixed portion 3x of the hetero core optical fiber 3, but the loop-shaped curved shape may be a shape pattern other than the circular shape. . For example, the loop-shaped curved line shape may be an elliptical pattern, or a circular or elliptical pattern.

[Second Embodiment]
Next, a second embodiment of the present invention will be described below with reference to FIGS. 7 and 8. Note that this embodiment differs from the first embodiment only in the arrangement pattern of the fixed portion 3x of the hetero core optical fiber 3. Therefore, description of the same items as those in the first embodiment will be omitted.

  With reference to FIG. 7, in the optical fiber type sensor device 21 of the present embodiment, the entire fixed portion 3x of the hetero core optical fiber 3 (including the hetero core portion 3a) is curved in a convex curved pattern. It is fixed to the seat member 2 in a closed state. More specifically, the convex curved pattern is, for example, a semicircular pattern having a constant or substantially constant radius of curvature in the present embodiment.

  In the entire fixed portion 3x curved in such a semicircular pattern, the center of curvature of each portion (including the hetero core portion 3a at the central portion of the fixed portion 3x) is located on both sides of the optical fiber 3 of the fixed portion 3x. The entire fixed portion 3x is curved so that the fixed portion 3x exists only on one side (the inner side of the semicircular shape and the inner side of the outer side).

  Further, since the hetero core portion 3a is provided in the center of the fixed portion 3x curved in the semicircular pattern as described above, the hetero core portion 3a to the fixed portion 3x of the semicircular fixed portion 3x are provided. The portion on the one end side and the portion on the other end side of the fixed portion 3x from the hetero core portion 3a are symmetrical shapes (specifically, they are line symmetric with respect to a straight line that crosses the central portion of the hetero core portion 3a in the Y-axis direction). The shape is curved.

  The fixed portion 3x does not have a linearly extending portion.

  The optical fiber type sensor device 21 of the present embodiment is the same as that of the first embodiment except the above configuration.

  In the optical fiber type sensor device 21 configured as described above, since the fixed portion 3x of the hetero core optical fiber 3 is fixed to the sheet member 2 in a semicircular pattern, the same as in the first embodiment. The degree of bending of the hetero core portion 3a as the bending portion included in the fixed portion 3x changes according to the expansion and contraction of the sheet member 2 along the surface.

  That is, when the sheet member 2 is pulled and extended in the X-axis direction of FIG. 7 (the tangential direction of the central portion of the hetero core portion 3a) or in a direction close thereto, the degree of curvature of the hetero core portion 3a decreases (average curvature). Is smaller).

  Further, when the sheet member 2 is pulled and extended in the Y-axis direction of FIG. 7 (direction orthogonal to the tangential direction of the central portion of the hetero core portion 3a) or a direction close thereto, the degree of bending of the hetero core portion 3a increases ( The average curvature will increase).

  Therefore, like the first embodiment, when the sheet member 2 is attached to an arbitrary measurement target surface that expands and contracts in the direction along the surface, the hetero core portion is expanded according to the expansion and contraction of the sheet member 2 accompanying the expansion and contraction of the measurement target surface. The degree of curvature of 3a will change. Further, the expansion of the sheet member 2 in the case of the expansion and contraction of the sheet member 2 in the X-axis direction (or a direction close thereto) and the expansion and contraction of the sheet member 2 in the Y-axis direction (or a direction close to this). The directions of change in the degree of curvature of the hetero core portion 3a with respect to an increase in the amount (increase or decrease in the degree of curvature) are different from each other.

  Moreover, in the optical fiber type sensor device 21 of the present embodiment, since the entire fixed portion 3x of the hetero core optical fiber 3 does not have a linearly extending portion, the expansion and contraction of the sheet member 2 is extremely low. It is difficult for the hetero-core optical fiber 3 (which has high rigidity against expansion and contraction) to interfere. As a result, when the sheet member 2 is attached to an arbitrary measurement target surface that expands and contracts in the direction along the surface, the expansion and contraction of the sheet member 2 due to the expansion and contraction of the measurement target surface is highly tracked as in the first embodiment. It can be done smoothly by sex.

  The measurement for detecting the expansion and contraction of the measurement target surface using the optical fiber type sensor device 21 can be performed by the same measurement method as that of the first embodiment. That is, the expansion and contraction of the measurement target surface can be detected from the measured value of the optical loss of the hetero core optical fiber 3 with the sheet member 2 attached to the measurement target surface, as in the first embodiment.

  Next, a verification test of operation characteristics of the example of the optical fiber type sensor device 21 of the present embodiment will be described with reference to FIG.

  The optical fiber type sensor device 21 of the example was manufactured, and the relationship between the extension amount of the sheet member 2 of the optical fiber type sensor device 21 and the optical loss of the hetero core optical fiber 3 was measured. The semi-circular diameter φ of the fixed portion 3x of the hetero-core optical fiber 3 of the optical fiber type sensor device 21 of the manufactured example is, for example, 30 mm, and the sheet member 2 is, for example, a rectangular shape having a size of 50 × 20 mm. . Other specifications of the sheet member 2 and the hetero core optical fiber 3 of the optical fiber type sensor device 21 are the same as those of the example according to the first embodiment.

  With respect to the optical fiber type sensor device 21 of the embodiment, the sheet member 2 is pulled and extended in the X-axis direction, for example, of the X-axis direction and the Y-axis direction, and shortened from the extended state. The optical loss of the hetero core optical fiber 3 was measured using the measurement system 10 at a plurality of tensile displacement amounts (extension amount from the initial state) of the sheet member 2 at the time of extension and at the time of reduction, respectively. In this case, the pulling of the sheet member 2 is performed using the same jig as in the verification test according to the first embodiment.

  FIG. 8 shows measurement data obtained by the verification test. The displacement amount on the horizontal axis of FIG. 8 represents the amount of expansion in the X-axis direction from the initial state of the sheet member 2 (the state where the fixed portion 3x of the heterocore optical fiber 3 is semicircular), and the vertical axis. The optical loss is a transmission loss expressed as a ratio of the intensity of outgoing light to the intensity of incoming light of the hetero-core optical fiber 3 in decibel units.

  As shown in FIG. 8, when the sheet member 2 of the optical fiber type sensor device 21 is extended in the X-axis direction, the greater the amount of extension is, the smaller the degree of bending of the hetero core portion 3a becomes. It can be seen that the optical loss of the fiber 3 decreases monotonously with good sensitivity.

  It was also confirmed that the change in the optical loss of the hetero core optical fiber 3 has a hysteresis characteristic when the sheet member 2 is extended in the X-axis direction and when it is shortened. According to the measurement data shown in FIG. 8, even when the sheet member 2 is extended in the X-axis direction and the sheet member 2 is shortened, even if the extension amount of the sheet member 2 is the same, the light transmission of the hetero core optical fiber 3 is transmitted. The loss (light loss) is slightly different.

  When the sheet member 2 of the optical fiber type sensor device 21 of the present embodiment is extended in the Y-axis direction, the hetero core portion 3a increases as the extension amount of the sheet member 2 increases, as in the first embodiment. As a result, the degree of bending of the hetero core optical fiber 3 increases, and the optical loss of the hetero core optical fiber 3 increases.

  Supplementally, in the second embodiment, a semicircular pattern is adopted as the convex curved shape of the fixed portion 3x of the hetero core optical fiber 3, but the convex curved shape is a curved shape other than the semicircular shape. May be For example, the convex curved shape may be a semi-elliptical shape, a parabolic shape, a pattern of a half cycle of a triangular wave, or a pattern similar to these shapes.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. Note that this embodiment differs from the first embodiment only in the shape of the sheet member 2. Therefore, description of the same items as those in the first embodiment will be omitted.

  In the optical fiber type sensor device 31 of the present embodiment, the sheet member 2 is formed into a curved shape with a substantially constant width along the fixed portion 3x of the hetero core optical fiber 3. For example, in the present embodiment, since the shape pattern of the fixed portion 3x of the hetero core optical fiber 3 is a circular pattern, the sheet member 2 also has a circular curved shape. The fixed portion 3x of the hetero core optical fiber 3 is arranged so as to pass through the center of the sheet member 2 curved in a circular shape in the width direction.

  The optical fiber type sensor device 31 of the present embodiment is the same as that of the first embodiment except for the configuration described above.

  In the optical fiber type sensor device 31 of the present embodiment, it is possible to detect the expansion and contraction of an arbitrary measurement target surface as in the first embodiment.

  Moreover, since the area of the sheet member 2 is smaller than that of the first embodiment, the material cost of the sheet member 2 can be reduced and the weight can be further reduced.

  In the present embodiment, the case where the shape pattern of the fixed portion 3x of the hetero core optical fiber 3 is a circular pattern has been described, but the shape pattern of the fixed portion 3x is a loop-shaped curved shape other than the circular shape. Alternatively, it may have a convex curved shape as in the second embodiment. In this case, the shape of the sheet member 2 may be set according to the shape pattern of the fixed portion 3x.

[Fourth Embodiment]
Next, of the optical fiber type sensor devices 1, 21 and 31 of the above-described embodiment, for example, the optical fiber type sensor device 21 of the second embodiment is used to detect a movement of a human joint. Will be described as a fourth embodiment.

  The measurement example of the present embodiment is, for example, a measurement example in which the optical fiber type sensor device 21 is used to detect each of a palmar flexion motion and a ulnar flexion motion as a flexion motion of a human wrist joint. Here, the palm flexion operation is an operation of bending the wrist joint in the form shown in FIG. 10A, and the ulnar flexion operation is an operation of bending the wrist joint in the form shown in FIG. 10B. In the following description, the optical fiber type sensor device 21 for detecting the palm flexion motion of the wrist joint is represented by the reference numeral 21a, and the optical fiber type sensor device 21 for detecting the ulnar motion is represented by the reference numeral 21b. Represent

  Here, according to various experiments and examinations by the inventor of the present application, when the wrist joint is flexed, the surface portion Sa (on the same side as the back of the hand of the skin surface on the distal end side of the forearm portion connected to the wrist joint) 11A. Hereinafter, the skin of the back side part Sa) extends in the longitudinal direction of the forearm.

  Therefore, in the present embodiment, the back side surface Sa of the skin surface on the tip side of the forearm is used as the measurement target surface for detecting the flexion motion of the wrist joint, and the back side surface Sa shown in FIG. The sheet member 2 of the optical fiber type sensor device 21a was attached as shown in FIG.

  In this case, the seat member 2 is attached to the back side part Sa such that the X-axis direction (the tangential direction of the central part of the hetero core part 3a) is directed to the longitudinal direction of the forearm part.

  Further, according to various experiments and studies conducted by the inventor of the present application, when the wrist joint is subjected to ulnar flexion, the surface portion Sb on the same side as the thumb of the hand of the skin surface on the distal end side of the forearm portion connected to the wrist joint. (Refer to FIG. 11B. The skin of the side surface Sb of the thumb hereinafter) extends in the longitudinal direction of the forearm.

  Therefore, in the present embodiment, the thumb side surface Sb of the skin surface on the tip side of the forearm is used as the measurement target surface for detecting the ulnar movement of the wrist joint. The sheet member 2 of the optical fiber type sensor device 21b was attached as shown in FIG.

  In this case, the seat member 2 is attached to the side surface Sb of the thumb such that the X-axis direction (the tangential direction of the central portion of the hetero core portion 3a) is directed to the longitudinal direction of the forearm portion.

  The optical fiber type sensor devices 21a and 21b can be attached to the back side portion Sa and the side surface portion Sb of the back of the sheet member 2 through, for example, an appropriate adhesive or tape.

  In the measurement example of the present embodiment, each of the wrist flexion motion and the ulnar flexion motion is referred to as a wrist joint flexion motion (palm flexion motion or ulnar flexion motion), standby (standby in flexion state), and extension motion. A series of operations was repeated several times. In parallel with this, the change with time of the optical loss in each of the optical fibers 3 of the optical fiber type sensor devices 21a and 21b was measured.

  In this case, the time required for each of the wrist joint flexion motion (palm flexion motion or ulnar flexion motion), standby (standby in flexion state), and extension motion was set to about 5 seconds.

  FIG. 12A is a graph showing a measurement result regarding a wrist flexion motion, and FIG. 12B is a graph showing a measurement result regarding a wrist joint ulnar motion. The relative optical loss on the vertical axis in FIGS. 12A and 12B is based on the optical loss of the hetero-core optical fiber 3 in the initial state of the sheet member 2 (the state in which the wrist joint is extended and attached to the surface to be measured). Relative light loss is expressed in decibels.

  As can be seen from the graph of FIG. 12A, the flexion of the wrist joint causes the sheet member 2 of the optical fiber type sensor device 21a to extend in the X-axis direction or a direction close to the X-axis direction (therefore, the degree of curvature of the hetero core portion 3a can be reduced). It is confirmed that the optical loss of the hetero core optical fiber 3 is reduced.

  Further, by the extension motion of the wrist joint after the standby motion, the sheet member 2 of the optical fiber type sensor device 21a is restored to the initial shortened state (as a result, the degree of bending of the hetero core portion 3a is increased), and thus the hetero core light is increased. It was confirmed that the optical loss of the fiber 3 was increased.

  Similarly, as shown in the graph of FIG. 12B, the seat member 2 of the optical fiber type sensor device 21b extends in the X-axis direction or in a direction close thereto due to the ulnar movement of the wrist joint (therefore, the hetero-core portion 3a has the same shape). It has been confirmed that the optical loss of the hetero core optical fiber 3 is reduced by decreasing the degree of bending).

  Further, the wrist joint extending operation after the standby operation restores the sheet member 2 to the initial shortened state (and thus increases the degree of curvature of the hetero core portion 3a), thereby increasing the optical loss of the hetero core optical fiber 3. It was confirmed to do.

  Therefore, the movement of the wrist joint can be indirectly detected by detecting the extension / contraction of the skin surface on the distal end side of the forearm, which expands / contracts according to the flexion / extension of the wrist joint, by the optical fiber type sensor device 21.

  In this case, since the optical fiber type sensor device 21 does not need to be directly attached to the wrist joint, the natural movement of the wrist joint can be detected without inhibiting the movement of the wrist joint.

  In the present embodiment, the measurement example when detecting the movement of the wrist joint is shown, but other joints of the arm (elbow joint, shoulder joint), finger joint, leg joints (ankle joint, knee joint, hip joint) It is also possible to detect the movement of joints such as), etc. by detecting the expansion and contraction of the skin surface that is linked to the movement of each joint.

  Further, in the present embodiment, the optical fiber type sensor device of the second embodiment is used, but it goes without saying that the optical fiber type sensor device of the first embodiment or the third embodiment may be used. is there.

[Modification]
Next, some modifications related to the first to fourth embodiments will be described.

  The optical fiber type sensor devices 1, 21, and 31 shown in the first to third embodiments are configured such that the degree of bending of the hetero core portion 3a according to the expansion and contraction of the sheet member 2 in both the X-axis direction and the Y-axis direction. Are configured to change. However, for example, when the expansion and contraction of the surface to be measured occurs in one direction, the degree of bending of the hetero core portion 3a does not easily change with respect to the expansion and contraction of the sheet member 2 in the direction orthogonal to the one direction. The shape pattern of the fixed portion 3x of the hetero core optical fiber 3 may be set. Alternatively, for example, by including a portion that extends in a linear state in the one direction in the fixed portion 3x, it becomes difficult for the sheet member 2 to expand and contract in a direction orthogonal to the one direction (or a direction close thereto). May be.

  When the shape pattern of the fixed portion 3x of the hetero-core optical fiber 3 is a loop-shaped curved shape or a convex curved shape, the hetero-core portion according to the change in the extension amount of the sheet member 2 in the one direction. In order to increase the sensitivity of the change in the degree of curvature of 3a (and thus the sensitivity of the change in the optical loss of the hetero core optical fiber 3), the tangential direction (X-axis direction) of the central part of the hetero core part 3a coincides with the one direction or It is preferable that they substantially match.

  Further, each of the optical fiber type sensor devices 1, 21 and 31 shown in the first to third embodiments is configured by using the hetero core optical fiber 3 having the hetero core portion 3a. However, the optical fiber type sensor device of the present invention, depending on the bending degree of the bending portion included in the fixed portion fixed to the sheet member, as long as the light transmission characteristics can be changed with a relatively high correlation, Optical fibers other than the hetero core optical fiber 3 can also be used.

  For example, a long-period optical fiber grating can be used as the optical fiber other than the hetero core optical fiber 3. In this case, since the resonance wavelength shifts depending on the degree of curvature of the optical fiber, the degree of curvature of the optical fiber can be detected based on the spectrum of the transmitted light in the optical fiber.

  Further, as in the case of the fourth embodiment, when the motion of a human joint is detected by detecting the expansion and contraction of the skin surface that expands and contracts according to the motion of the joint, the sensor device mounted on the skin surface is used. May be a sensor device other than the optical fiber type sensor device.

  1, 21, 31 ... Optical fiber type sensor device, 2 ... Sheet member, 3 ... Optical fiber, 3a ... Hetero core portion (curved portion), 3x ... Fixed portion.

Claims (7)

A stretchable sheet member that is mounted on the measurement target surface that expands and contracts in the direction along the surface so as to expand and contract with the expansion and contraction of the measurement target surface, and the sheet member that is disposed along the surface of the sheet member. And an optical fiber having a fixed portion fixed to ,
Fixed part of the pre-Symbol optical fiber, the sheet member surface along the direction of the bending degree in response to expansion and contraction is curved so as to change the curved portion including Mutotomoni, extension at a predetermined first direction of the sheet member The bending degree of the bending portion is reduced according to the above, and the bending degree of the bending portion is increased according to the extension of the sheet member in the second direction orthogonal to the first direction. Cage,
Before SL optical fiber transmission loss of light increases with an increase in the degree of curve of the curved portion due to elongation of said sheet member in said second direction and of said sheet member in said first direction An optical fiber type sensor device, characterized in that the transmission loss of light is reduced in accordance with a decrease in the degree of bending of the bending portion due to extension . The optical fiber type sensor device according to claim 1 ,
The optical fiber type sensor device, wherein the fixed portion of the optical fiber is arranged so as not to have a portion that linearly extends in each of the first direction and the second direction. The optical fiber type sensor device according to claim 1 or 2 ,
The entire fixed portion of the optical fiber, or the entire fixed portion excluding both ends thereof, is curved such that the center of curvature of each portion is present on one side of both sides of the optical fiber in the fixed portion. An optical fiber type sensor device. The optical fiber type sensor device according to claim 3 ,
The optical fiber type sensor device, wherein the entire fixed portion of the optical fiber or the entire portion except both ends of the fixed portion is curved in a loop-shaped curved shape or a convex curved-shaped pattern. The optical fiber type sensor device according to claim 3 or 4 ,
The curved portion is provided at a central portion in the longitudinal direction of the fixed portion of the optical fiber, and the entire fixed portion of the optical fiber, or the entire portion except both ends of the fixed portion is fixed from the curved portion. An optical fiber sensor device, wherein a portion on one end side of the portion and a portion on the other end side of the fixed portion from the bending portion are curved so as to have a symmetrical shape. The optical fiber type sensor device according to any one of claims 1 to 5 ,
The optical fiber, the curved portion, the optical fiber sensor and wherein the than the core of an optical fiber connected to both sides of the curved portion is an optical fiber which is a hetero core portion having a small diameter core. The optical fiber type sensor device according to any one of claims 1 to 7 ,
The optical fiber type sensor device, wherein the measurement target surface is a portion of the skin surface of a person that expands and contracts in the direction along the surface according to the movement of a predetermined target joint of the person.