A test system and method based on fiber grating sensor suction cup adsorption state

Abstract

The present invention provides a test system based on the adsorption state of a fiber grating sensing sucker, the test system comprising: a flexible sucker, a fiber grating sensor is fixed on the sucker, one end of the fiber grating sensor is connected to a light source through a coupler, and the other end is connected to a spectrometer, and the flexible sucker is connected to a vacuum pump; when the flexible sucker is placed on the adsorption surface to be tested, negative pressure is generated in the flexible sucker through the vacuum pump, and the sucker is adsorbed on the adsorption surface to be tested. The present invention utilizes the characteristics of fiber grating sensing, such as wide application range, good stability, high precision, small size, and light weight, and can realize real-time monitoring of the adsorption state of the flexible sucker by encapsulating and fixing the fiber grating sensor on the flexible sucker.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber detection technology, and in particular to a testing system and method based on the adsorption state of an optical fiber grating sensing suction cup. Background Art

[0002] The heart fixator is one of the most commonly used important medical devices in coronary artery bypass grafting. It fixes the beating heart during the operation and can ensure the local stability of the surgical area.

[0003] The commonly used adsorption-fixed heart fixator lacks the adsorption status monitoring function. During use, it is easy to cause damage to the heart surface due to excessive adsorption and fixation strength, or the adsorption and fixation function fails due to the inability to monitor the leakage, affecting the surgical effect. Therefore, it is very important to monitor the adsorption status of the suction cup. Summary of the invention

[0004] In order to solve the technical problem of monitoring the suction cup and tube state of a heart fixer in the prior art, an object of the present invention is to provide a test system based on fiber grating sensing suction cup adsorption state, the test system comprising:

[0005] A flexible suction cup, on which a fiber grating sensor is fixed, one end of the fiber grating sensor is connected to a light source through a coupler, and the other end is connected to a spectrometer, and the flexible suction cup is connected to a vacuum pump;

[0006] When the flexible suction cup is placed on the adsorption surface to be tested, negative pressure is generated in the flexible suction cup through the vacuum pump, so that the flexible suction cup is adsorbed on the adsorption surface to be tested.

[0007] In some preferred embodiments, the flexible suction cup is an elliptical structure with a hollow interior, and the first side of the flexible suction cup has a plurality of recessed cavities, so that the first side of the flexible suction cup forms a fish skeleton structure, and the fiber Bragg grating sensor is fixed on the fish skeleton structure;

[0008] The second side of the flexible suction cup is placed on the adsorption surface to be tested.

[0009] In some preferred embodiments, adhesive is added into the recessed cavity so that the fiber grating sensor is fixed to the fish skeleton structure on the first side of the flexible suction cup through the adhesive.

[0010] In some preferred embodiments, the fiber grating sensor comprises a strain gauge, a bare optical fiber is fixed on the strain gauge, and the grating portion of the bare optical fiber is covered by a glue layer.

[0011] In some preferred embodiments, the strain sheet of the fiber grating sensor is fixed to the fish skeleton structure on the first side of the flexible suction cup by the adhesive.

[0012] In some preferred embodiments, the strain gauge is a titanium alloy strain gauge.

[0013] In some preferred embodiments, the grating portion of the bare optical fiber is a Bragg fiber grating.

[0014] In some preferred embodiments, the adhesive coating layer is a DP420 epoxy resin glue coating layer.

[0015] In some preferred embodiments, the grating portion of the bare optical fiber is located at the center of the first side of the flexible suction cup.

[0016] Another object of the present invention is to provide a method for testing the adsorption state of a fiber grating sensing chuck, the method comprising:

[0017] Build a test system based on fiber Bragg grating sensing suction cup adsorption state;

[0018] The flexible suction cup is placed on the adsorption surface to be tested, and the outgoing light of the light source passes through the fiber grating sensor, and the spectrometer collects the first wavelength value of the fiber grating;

[0019] The vacuum pump is ventilated with air pressure, the flexible suction cup is adsorbed on the adsorption surface to be tested, the emitted light of the light source passes through the fiber grating sensor, and the spectrometer collects the second wavelength value of the fiber grating;

[0020] The wavelength drift of the fiber grating is calculated by the first wavelength value and the second wavelength value, and the adsorption state of the flexible suction cup is determined according to the wavelength drift of the fiber grating.

[0021] The present invention provides a testing system and method based on the adsorption state of a fiber grating sensor suction cup. The fiber grating is packaged by a substrate packaging method, and then the packaged fiber grating sensor is fixed on the fish skeleton structure of the flexible suction cup surface by pasting. When the flexible suction cup is adsorbed and fixed by force, the deformation of the suction cup surface can cause the change of wavelength drift. The method has a simple structure, low production cost, and is easy to operate. It has important practical significance in realizing the suction cup adsorption state detection function and has good application prospects.

[0022] The present invention provides a testing system and method based on the adsorption state of a fiber grating sensing suction cup, which utilizes the characteristics of fiber grating sensing, such as wide application range, good stability, high precision, small size, and light weight. By packaging and fixing the fiber grating sensor on a flexible suction cup, real-time monitoring of the adsorption state of the flexible suction cup can be achieved.

[0023] The present invention provides a testing system and method based on the adsorption state of a fiber grating sensing suction cup, which has a simple structure, reliable stability, low cost, high repeatability, and is easy to realize batch processing of devices. The present invention uses a fiber grating sensor as an adsorption state monitoring sensor, which has high precision, high sensitivity, and is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The structural diagram of a testing system based on fiber grating sensing suction cup adsorption state of the present invention is schematically shown.

[0026] Figure 2 A schematic diagram of the packaging of the fiber grating sensor of the present invention is shown.

[0027] Figure 3 The schematic diagram shows the structure of the fiber grating sensor of the present invention fixed on the flexible suction cup.

[0028] Figure 4 Shows Figure 3 Sectional view of AA. DETAILED DESCRIPTION

[0029] In order to make the above and other features and advantages of the present invention more clear, the present invention is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0030] In order to solve the technical problem of monitoring the state of the suction cup and the suction tube of the heart fixer in the prior art, as Figure 1 The structure diagram of a test system based on the adsorption state of a fiber Bragg grating sensing sucker of the present invention is shown. According to an embodiment of the present invention, a test system based on the adsorption state of a fiber Bragg grating sensing sucker comprises: a flexible sucker 1, a fiber Bragg grating sensor fixed on the flexible sucker 1, one end of the fiber Bragg grating sensor is connected to a coupler 8 through an optical fiber 4, and the coupler 8 is connected to a light source 7. The other end of the fiber Bragg grating sensor is connected to a spectrometer 9 through an optical fiber 4. The flexible sucker 1 is connected to a vacuum pump 10 through a hose.

[0031] When the flexible suction cup 1 is placed on the adsorption surface 6 to be tested, negative pressure is generated in the flexible suction cup 1 through the vacuum pump 10, and the flexible suction cup 1 is adsorbed on the adsorption surface 6 to be tested.

[0032] like Figure 2 The schematic diagram of the packaging of the fiber Bragg grating sensor of the present invention is shown, the fiber Bragg grating sensor comprises a strain sheet 2, and a bare optical fiber is fixed on the strain sheet 2. The bare optical fiber is a section of the optical fiber 4 with the outer cladding stripped off. The bare optical fiber has a grating part 401, and the grating part 401 of the bare optical fiber is covered by the adhesive layer 3.

[0033] In some preferred embodiments, the adhesive layer is a DP420 epoxy resin adhesive layer, the strain gauge 2 is a titanium alloy strain gauge, and the grating portion 401 of the bare optical fiber is a Bragg fiber grating.

[0034] like Figure 3 The structure diagram of the fiber Bragg grating sensor of the present invention fixed on the flexible suction cup is shown in FIG. Figure 4 Shown Figure 3 In the cross-sectional view taken along line AA, according to an embodiment of the present invention, the flexible suction cup 1 is an elliptical structure with a hollow interior, and the hollow interior is connected to the vacuum pump 10 via a hose.

[0035] The first side (upper surface) of the flexible suction cup 1 has a plurality of recessed cavities 101, so that the first side of the flexible suction cup 1 forms a fish skeleton structure, and the fiber grating sensor is fixed on the strip-shaped bracket 102 of the fish skeleton structure. The second side (lower surface) of the flexible suction cup 1 is placed on the adsorption surface 6 to be tested.

[0036] Specifically, adhesive 5 is added into the concave cavity 101, so that the fiber Bragg grating sensor is fixed on the fish skeleton structure of the first side of the flexible suction cup 1 through the adhesive 5. Further, the strain sheet 2 of the fiber Bragg grating sensor is fixed on the fish skeleton structure of the first side of the flexible suction cup 1 through the adhesive 5.

[0037] In some preferred embodiments, the grating portion 401 of the bare optical fiber is located at the center of the first side of the flexible suction cup 1 .

[0038] According to an embodiment of the present invention, a method for testing the adsorption state of a fiber grating sensing suction cup is provided, comprising:

[0039] Step S1, constructing a test system based on the fiber grating sensing suction cup adsorption state provided by the present invention.

[0040] Step S2: collecting the initial value of the fiber Bragg grating wavelength.

[0041] The flexible suction cup 1 is placed on the adsorption surface 6 to be tested, and the emitted light of the light source 7 passes through the fiber grating sensor, and the spectrometer 9 collects the first wavelength value of the fiber grating (grating part 401).

[0042] Step S3, collecting the monitoring value of the fiber Bragg grating wavelength.

[0043] The vacuum pump 10 is ventilated, the flexible suction cup 1 is adsorbed on the adsorption surface 6 to be tested, and the emitted light of the light source 7 passes through the fiber grating sensor, and the spectrometer 9 collects the second wavelength value of the fiber grating (grating part 401).

[0044] The wavelength drift of the fiber grating is calculated by the first wavelength value and the second wavelength value, and the adsorption state of the flexible suction cup is determined according to the wavelength drift of the fiber grating.

[0045] In a specific embodiment, the adsorption state test is performed on three adsorption surfaces 6 to be tested, namely, a plane, a curved surface, and a spherical surface.

[0046] The flexible suction cup 1 fixing the fiber Bragg grating sensor is put into pressure-free contact with the adsorption surface 6, and the fiber Bragg grating wavelength value is recorded as the initial value.

[0047] The vacuum pump 10 is adjusted to set the vacuum value to 30 kPa, and the flexible suction cup 1 is stably adsorbed and fixed on the adsorption surface 6. At this time, the fiber grating is strained and its wavelength drifts, which is recorded as the monitoring value. During the adsorption process, the flexible suction cup 1 is subjected to force, and the flexible suction cup 1 bulges inward and generates strain.

[0048] The three adsorption surfaces tested, namely, the plane, the curved surface, and the spherical surface, were tested 5 times respectively, and the structural results of the drift of the central wavelength of the fiber grating are shown in Table 1 below.

[0049] Table 1 Changes in the central wavelength of the fiber Bragg grating when the flexible suction cups on different adsorption surfaces are fixed

[0050]

[0051] It can be seen from Table 1 that when the flexible suction cup maintains an adsorbed and fixed state, the central wavelength of the fiber Bragg grating will drift. The present invention can effectively monitor the adsorption state of the suction cup on different adsorption surfaces. According to the fiber Bragg grating wavelength drift of the fiber Bragg grating sensor, it can be reflected whether the flexible suction cup is stably fixed on the adsorption surface.

[0052] The present invention fixes a uniform Bragg grating on a strain sheet with superelasticity, tests the wavelength drift of the fiber Bragg grating under different bending degrees of the strain sheet, and completes the calibration of the relationship between the bending degree and the wavelength drift. The strain sheet with the fiber Bragg grating is implanted on the surface of a flexible suction cup. By testing the change of the wavelength drift of the fiber Bragg grating during the adsorption process, the deformation of the flexible suction cup during the adsorption process is monitored. The stronger the adsorption degree, the greater the deformation of the flexible suction cup, and the higher the bending degree, the greater the wavelength drift of the fiber Bragg grating.

[0053] In order to achieve real-time monitoring of the adsorption state of the heart fixation suction cup, an adsorption state monitoring system based on fiber grating sensing is designed and constructed in the embodiment of the present invention. The fiber grating used is completed by a femtosecond laser writing platform and implanted on the surface of the flexible suction cup. The strain of the flexible suction cup under different adsorption states is monitored by the change of wavelength drift.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for testing the adsorption state of a fiber grating sensor suction cup, characterized in that: The test method includes: A test system is constructed, wherein the system comprises a flexible suction cup, a fiber grating sensor is fixed on the suction cup, one end of the fiber grating sensor is connected to a light source through a coupler, and the other end is connected to a spectrometer, and the flexible suction cup is connected to a vacuum pump; when the flexible suction cup is placed on the adsorption surface to be tested, negative pressure is generated in the flexible suction cup through the vacuum pump, and the flexible suction cup is adsorbed on the adsorption surface to be tested. The flexible suction cup is placed on the adsorption surface to be tested, and the outgoing light of the light source passes through the fiber grating sensor, and the spectrometer collects the first wavelength value of the fiber grating; The vacuum pump is ventilated with air pressure, the flexible suction cup is adsorbed on the adsorption surface to be tested, the emitted light of the light source passes through the fiber grating sensor, and the spectrometer collects the second wavelength value of the fiber grating; The wavelength drift of the fiber grating is calculated by the first wavelength value and the second wavelength value, and the adsorption state of the flexible suction cup is determined according to the wavelength drift of the fiber grating.

2. The testing method according to claim 1, characterized in that: The flexible suction cup is an elliptical structure with a hollow interior, and a first side surface of the flexible suction cup has a plurality of concave cavities, so that the first side surface of the flexible suction cup forms a fish skeleton structure, and the fiber Bragg grating sensor is fixed on the fish skeleton structure; The second side of the flexible suction cup is placed on the adsorption surface to be tested.

3. The testing method according to claim 2, characterized in that: Add adhesive into the concave cavity, so that the fiber grating sensor is fixed on the fish skeleton structure on the first side of the flexible suction cup through the adhesive.

4. The testing method according to claim 3, characterized in that: The fiber grating sensor comprises a strain sheet, a bare optical fiber is fixed on the strain sheet, and the grating part of the bare optical fiber is covered by a glue coating layer.

5. The testing method according to claim 4, characterized in that: The strain sheet of the fiber grating sensor is fixed on the fish skeleton structure of the first side of the flexible suction cup by the adhesive.

6. The testing method according to claim 5, characterized in that: The strain gauge is a titanium alloy strain gauge.

7. The testing method according to claim 4, characterized in that: The grating part of the bare optical fiber is a Bragg fiber grating.

8. The testing method according to claim 4, characterized in that: The glue coating layer is a DP420 epoxy resin glue coating layer.

9. The testing method according to claim 7, characterized in that: The grating portion of the bare optical fiber is located at the center of the first side surface of the flexible suction cup.

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