CN101750026A

CN101750026A - Large-length fiber bragg grating curvature sensor with rebuilt body and encapsulation method thereof

Info

Publication number: CN101750026A
Application number: CN201010023122A
Authority: CN
Inventors: 沈林勇; 余见能; 章亚男; 钱晋武; 徐草
Original assignee: University of Shanghai for Science and Technology
Current assignee: Haian Shenling Electrical Appliance Manufacturing Co., Ltd.
Priority date: 2010-01-21
Filing date: 2010-01-21
Publication date: 2010-06-23
Anticipated expiration: 2030-01-21
Also published as: CN101750026B

Abstract

The invention relates to a large-length fiber bragg grating curvature sensor with a rebuilt body and an encapsulation method thereof. The sensor comprises a base material and optical fibers, the base material is a shape memory alloy wire with a square-shaped cross section, four optical fibers are respectively attached to the four side surfaces of the shape memory alloy wire, each optical fiber is distributed with raster points uniformly, the raster points on every two adjacent optical fibers form detection points in pair, the detection points on the four optical fibers are mutually arranged in a staggered way, glue is uniformly coated on each raster point to realize gluing fixation, and plastic tubes are sleeved outside the optical fibers. In the encapsulation method, a segmented base capable of being connected in series is adopted to be fixed on a plane in series, the front part and the rear part of the base are respectively provided with a clamping device for clamping the base material, the rear part is provided with a tightening-up device for tightening up the base material before clamping, the base material is sleeved with a plurality of positioning sleeve for positioning the four optical fibers and the base material and then fixing each raster point in a gluing way, finally, the plastic tubes are sleeved and blown by an electric heating fan for tightening. The method has high encapsulation precision and small encapsulation angle error in circumferential direction.

Description

Large-length fiber bragg grating curvature sensor with rebuilt body and method for packing thereof

Technical field

The present invention relates to a kind of fiber bragg grating curvature sensor and method for packing thereof of big length, the sensor that encapsulation is finished is mainly used in space deep camber curve shape detection range.

Technical background

In the deformation detection field, fiber grating also is mainly used in the structure small deformation and detects, the research work that is applied to beformable body large deformation detection is less relatively, and Shanghai University has obtained some progress and achievement in this respect, and the shape that its main application background is an intelligent endoscope is rebuild.In the practical distortion of endoscope, complicated spatial form usually can appear, and higher for the reliability requirement of the curvature sensing range of fiber grating and sensor.In order to reduce the restriction to network analyzer light source bandwidth, Shanghai University has made full use of the operating forceps road of endoscope, and the position relation of optical fiber grating sensing network according to design is encapsulated on the minute sized base material, has developed relevant packaging technology and device.

On the research basis that the intelligent endoscope shape is rebuild, proposed to be applied to peep in the ruins fiber bragg grating curvature sensor that the body shape of search and rescue robot is rebuild, this sensor and the difference that is applied to the sensor of intelligent endoscope have been to prolong the length of fiber bragg grating curvature sensor, and promptly the SHAPE DETECTION scope of fiber bragg grating curvature sensor becomes big; This just requires the light source bandwidth resources of network analyzer are redistributed utilization, and requires the encapsulation problem of the fiber bragg grating curvature sensor of the big length of solution.

The present invention is the encapsulation manufacturing method that is applied to peep in the ruins fiber bragg grating curvature sensor that the search and rescue robot body shape rebuilds, in order to guarantee the package position relation of fiber grating on the base material of small radial dimension, development and Design new packaging technology and device.

Summary of the invention

The objective of the invention is to, the defective at prior art exists provides a kind of large-length fiber bragg grating curvature sensor with rebuilt body and method for packing thereof, makes its sensor have high precision, high reliability, long-life characteristic.

For achieving the above object, design of the present invention is: a kind of base material is the sensor that xsect is foursquare shape-memory alloy wire, and design a cover and can finish the anchor clamps that long length fiber grating curvature sensor encapsulates, supporting with it, design a kind of locating sleeve and guarantee that the position between fiber grating and the base material concerns.

According to above-mentioned design, the present invention adopts following technical scheme:

A kind of large-length fiber bragg grating curvature sensor with rebuilt body comprises base material and optical fiber, it is characterized in that:

1) described base material is that xsect is foursquare shape-memory alloy wire,

2) there are four optical fiber to be attached to respectively on four sides of described shape-memory alloy wire,

3) uniform optical grating point on every optical fiber, the optical grating point of adjacent two optical fiber constitutes check point in pairs, the interlaced arrangement of check point on four optical fiber; Uniform and smooth glue coated realizes gluing fixing at each optical grating point place;

4) overcoat the plastic cement pipe.

A kind of method for packing of large-length fiber bragg grating curvature sensor with rebuilt body, be used to prepare above-mentioned sensor, it is characterized in that adopting series connected segmentation base, two clamp devices, a tightening device and a plurality of locating sleeve, this locating sleeve center square hole and described shape-memory alloy wire cunning are joined, the four side of this square hole respectively has a slotted eye and described fiber slide to join, and the encapsulation operation step is as follows:

1) segmentation base serial connection is fixed on the plane, at the front end of first section base first clamp device is installed, in the end the correct position of one section base is installed second clamp device and tightening device;

2) cleaned base material and locating sleeve, an end of base material is clamped by first clamp device, and is inserted in the locating sleeve that 2 times of detections are counted from its free end, by the free end of tightening device tension base material, by second clamp device base material other end is clamped then again;

3) launch four optical fiber, they are passed four slotted eyes up and down of locating sleeve correspondence respectively, the position of adjusting locating sleeve makes the two ends of each check point that a locating sleeve respectively be arranged;

4) fix each optical grating point with epoxyn, guarantee that the glue coated at each optical grating point place is uniform and smooth, wait for that the glue solidifies;

5) unclamp base material, put the plastic cement pipe, the electricity consumption hot hair dryer blows tightly.

The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: the invention provides the fiber bragg grating curvature sensor that a kind of body shape is rebuild big length, and the encapsulation that has solved long length fiber grating curvature sensor, improve encapsulation precision, especially reduced circumferential encapsulation angle error.Its key is not have relative motion between locating sleeve and the square memory alloy wire, and the structure of locating sleeve can guarantee the relative position relation of four optical fiber preferably simultaneously.

Description of drawings:

Fig. 1 is the structural representation of encapsulation holder part.

Fig. 2 is the structural representation of locating sleeve.

Fig. 3 is a fiber grating network topology synoptic diagram.(wherein figure (a) is a cross-sectional layout; Figure (b) launches vertically layout of back for fiber grating).

Embodiment

The preferred embodiments of the present invention accompanying drawings is as follows:

Embodiment one: referring to Fig. 3, the large-length fiber bragg grating curvature sensor with rebuilt body of present embodiment comprises base material 3 and optical fiber 9, described base material 3 is foursquare shape-memory alloy wire for xsect, there are four optical fiber 9 to be attached to respectively on four sides of described shape-memory alloy wire, uniform optical grating point 10 on the every optical fiber 9, the optical grating point 10 of adjacent two optical fiber 9 constitutes check points in pairs, the interlaced arrangement of check point on four optical fiber 9; Uniform and smooth glue coated realizes gluing fixing at each optical grating point 10 place; Overcoat the plastic cement pipe.

Embodiment two: referring to Fig. 1, Fig. 2, Fig. 3, the method for packing of the large-length fiber bragg grating curvature sensor with rebuilt body of present embodiment, be used to prepare the sensor, it is characterized in that adopting 1,5, tightening devices 7 of 2,4,6, two clamp devices of series connected segmentation base and a plurality of locating sleeve 8, this locating sleeve center square hole and described shape-memory alloy wire cunning are joined, the four side of this square hole respectively has a slotted eye and 9 sliding joining of described optical fiber, and the operation steps of encapsulation is as follows:

1) three sections bases are connected and fixed are placed on the plane, clamp device and tightening device are installed at the correct position of base;

2) cleaned base material and locating sleeve clamp an end of base material with clamp device, be inserted in the locating sleeve of requirement from free end after, free end with the other end that clamps base material after the tightening device tension again with clamp device;

3) launch four fiber gratings, they are passed four apertures up and down corresponding in the locating sleeve respectively, adjust the position of fiber grating and locating sleeve after finishing, make them satisfy layout shown in Figure 3;

4) fix each optical grating point with epoxyn, guarantee that the glue coated at each optical grating point place is uniform and smooth as far as possible, wait for that the glue solidifies;

Claims

1. a large-length fiber bragg grating curvature sensor with rebuilt body comprises base material (3) and optical fiber (9), it is characterized in that:

A. described base material (3) is foursquare shape-memory alloy wire for xsect,

B. there are four optical fiber (9) to be attached to respectively on four sides of described shape-memory alloy wire,

C. every optical fiber (9) is gone up uniform optical grating point (10), and the optical grating point (10) of adjacent two optical fiber (9) constitutes check point in pairs, the interlaced arrangement of check point on four optical fiber (9); Locating uniform and smooth glue coated at each optical grating point (10) realizes gluing fixing;

D. overcoat the plastic cement pipe.

2. the method for packing of a large-length fiber bragg grating curvature sensor with rebuilt body, be used to prepare large-length fiber bragg grating curvature sensor with rebuilt body according to claim 1, it is characterized in that adopting series connected segmentation base (2,4,6), two clamp devices (1,5), a tightening device (7) and a plurality of locating sleeve (8), this locating sleeve (8) center square hole and described shape-memory alloy wire cunning are joined, the four side of this square hole respectively has a slotted eye and described optical fiber (9) cunning to join, and the encapsulation operation step is as follows:

A. segmentation base (2,4,6) serial connection is fixed on the plane, at the front end of first section base (2) first clamp device (1) is installed, in the end the correct position of one section base (6) is installed second clamp device (5) and tightening device (7);

B. cleaned base material (3) and locating sleeve (8), one end of base material (4) is clamped by first clamp device (1), and be inserted in the locating sleeve (8) that 2 times of detections are counted from its free end, then by the free end of tightening device (7) tension base material, by second clamp device base material other end is clamped again;

C. launch four optical fiber (9), they are passed four slotted eyes up and down of locating sleeve correspondence respectively, adjust the position of locating sleeve (8), make the two ends of each check point that a locating sleeve (8) respectively be arranged;

D. fix each optical grating point (10) with epoxyn, guarantee that the glue coated that each optical grating point (10) locates is uniform and smooth, wait for that the glue solidifies;

E. unclamp base material (3), put the plastic cement pipe, the electricity consumption hot hair dryer blows tightly.