A high temperature strain sensor testing device
By designing a bracket and clamp made of high-temperature resistant materials, the effects of thermal expansion are eliminated, enabling accurate testing of high-temperature strain sensors under high-temperature conditions. This addresses the shortcomings of existing testing devices, improves testing accuracy and sensor lifespan, and expands the temperature range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWESTERN POLYTECHNICAL UNIV
- Filing Date
- 2023-11-07
- Publication Date
- 2026-05-19
AI Technical Summary
Existing technologies are insufficient to effectively test the mechanical properties of high-temperature strain sensors under high-temperature conditions, and cannot simulate their real-time strain performance in service environments.
A high-temperature strain sensor testing device was designed, using a bracket and clamp made of the same material. The effect of thermal expansion of the clamp is eliminated by the synchronous thermal expansion of the impact rod and the wire rod. Welding damage is avoided by physical contact between the electrode post and the sensor. High-temperature resistant insulating material is used to extend the temperature range.
It improves the accuracy of high-temperature testing, extends sensor lifespan, reduces manufacturing difficulty and cost, expands the testing temperature range to 1700℃, and ensures the reliability of test results.
Smart Images
Figure CN117664007B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of high-temperature strain sensor testing, and relates to high-temperature strain sensors, specifically a high-temperature strain sensor testing device. Background Technology
[0002] Flexible high-temperature strain sensors have long been a key research area for scientists worldwide, with broad application prospects in aerospace, petrochemicals, marine engineering, and other fields. They represent a cutting-edge technology crucial for advanced equipment manufacturing. In recent years, researchers have proposed novel high-temperature resistant flexible strain sensing technologies to better meet the strain measurement needs of high-temperature environments. However, due to the complexity and harshness of the application environment, high-temperature strain sensing technology still faces several challenges. Effective testing methods have been lacking to verify the real-time strain performance of high-temperature strain sensors under high-temperature conditions. Comparisons can only be made based on fixed strain molds under different strain conditions, failing to truly simulate the actual service environment.
[0003] Patent document CN115290127A discloses a device for testing the performance of flexible sensors, but this device can only be used to test flexible sensors under open room temperature conditions and cannot test the mechanical properties of sensors under high temperature conditions; CN110044398A discloses a high temperature strain testing device based on FP fiber optic sensor and its installation method, but this device and method can only be used to test optical strain sensors and are not applicable to the testing of other types of flexible mechanical sensors. Summary of the Invention
[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high-temperature strain sensor testing device to solve the technical problem that existing testing devices are unable to test the mechanical properties of sensors under high-temperature conditions.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A high-temperature strain sensor testing device includes multiple supports arranged in parallel along a horizontal direction. A sensor clamp is provided on the front end face of the foremost support. Each support has a threading rod positioning hole in the middle of its upper part. A threading rod is provided in all the threading rod positioning holes. The axial front end of the threading rod passes through the foremost support and is placed in the sensor clamp. The axial rear end of the threading rod extends out of the last support. The impact rod is made of the same material as the threading rod.
[0007] Each of the brackets has multiple impact rod positioning holes vertically opened in the middle of its lower part. The impact rod positioning holes on different brackets correspond one-to-one, forming multiple sets of impact rod positioning holes. An impact rod is provided in one set of impact rod positioning holes.
[0008] The sensor fixture includes an L-shaped fixture body. The front end face of the L-shaped fixture body has, vertically downward-facing, interconnected positioning holes for a threading rod, a sensor positioning slot, and a fastening plate positioning slot. The lower inner wall of the fastening plate positioning slot has a through-hole for an impact rod. The positioning hole for the threading rod has an axial front end that is flush with the front end face of the L-shaped fixture body. A high-temperature strain sensor to be tested is vertically mounted in the sensor positioning slot. The lower part of the high-temperature strain sensor to be tested passes through the sensor positioning slot and the fastening plate positioning slot, and is in perpendicular contact with the impact rod passing through the through-hole. A fastening plate is provided in the fastening plate positioning slot, and an electrode post is provided on the fastening plate, which is in contact with the high-temperature strain sensor to be tested.
[0009] This invention also includes the following technical features:
[0010] The fastening plate includes a body, in the middle of which a pair of electrode post positioning slots are provided. Above the pair of electrode post positioning slots, a pair of wiring slots are provided, each corresponding to and connected to the electrode post. Each pair of electrode post positioning slots is provided with an electrode post. The wires of the electrode posts pass through the corresponding wiring slots and two axial through holes on the wire rods and are connected to an external source meter. One end of the electrode post extending out of the electrode post positioning slot contacts the high-temperature strain sensor to be measured.
[0011] All of the aforementioned brackets have a fixing rod positioning hole at the same position on the lower part, and a fixing rod is provided in a common manner in multiple fixing rod positioning holes;
[0012] The inner wall of the fastening plate positioning groove is provided with a first screw hole.
[0013] The depth of the fastening plate positioning groove is 1 mm greater than the thickness of the fastening plate.
[0014] The width of the sensor positioning groove is the same as the width of the high-temperature strain sensor to be tested.
[0015] The top surface of the L-shaped clamp body is arc-shaped.
[0016] The frontmost bracket has multiple positioning pin holes, and the axial rear end face of the L-shaped clamp body has multiple positioning pins that correspond one-to-one with the positioning pin holes.
[0017] The main body has second screw holes on both sides.
[0018] Compared with the prior art, the beneficial technical effects of this invention are:
[0019] (I) This invention fixes only one side of the high-temperature strain sensor to be tested and uses the same material to make the entire device so that the thermal expansion generated by the fixture at high temperature will not affect the sensor itself. This eliminates the influence of the fixture's thermal expansion on the test results, avoids frequent calibration of the test device during the test, improves the accuracy of high-temperature testing, and solves the technical problem that the existing test devices are difficult to test the mechanical properties of sensors under high-temperature conditions.
[0020] (II) In this invention, the electrode post is in physical contact with the high-temperature strain sensor under test, which avoids the direct welding of wires to the high-temperature strain sensor under test, thereby avoiding the damage caused by welding wires to the high-temperature strain sensor under test and extending the life of the high-temperature strain sensor under test; in addition, by setting up wiring channels, wire rods, etc., the wires of the device are made more orderly.
[0021] (III) The entire device of the present invention can be made of high-temperature resistant insulating materials or other high-temperature resistant materials with surface insulation treatment. The range of materials is wide and it no longer depends on special materials with extremely low thermal expansion coefficients. The processing difficulty of each component is low, which reduces the difficulty and cost of manufacturing process.
[0022] (IV) The present invention has a wide applicable temperature range. Since the influence of the thermal expansion of the fixture on the test results is eliminated, it can be used below the melting point temperature of the selected material. If 99% alumina is used, the operating temperature can reach up to 1700°C, which greatly expands the temperature range of high temperature strain testing. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0024] Figure 2 This is a schematic diagram of the support structure in this invention;
[0025] Figure 3 This is a schematic diagram of the sensor fixture in this invention;
[0026] Figure 4 This is a schematic diagram of the fastening plate in the present invention;
[0027] Figure 5 This is a schematic diagram of the assembly of the fastening plate and the electrode post;
[0028] Figure 6 This is a schematic diagram of the threading rod in this invention.
[0029] The meanings of the labels in the figure are as follows: 1-bracket, 2-sensor clamp, 3-threading rod, 4-impact rod, 5-high temperature strain sensor to be tested, 6-fastening plate, 7-electrode post, 8-through hole, 9-fixing rod;
[0030] 101-Fitting rod positioning hole, 102-Impact rod positioning hole, 103-Fixing rod positioning hole, 104-Positioning pin hole;
[0031] 201-L-type clamp body, 202-thread rod positioning hole, 203-sensor positioning groove, 204-fastening plate positioning groove, 205-impact rod through hole, 206-first screw hole, 207-positioning pin;
[0032] 601-Body, 602-Electrode post positioning groove, 603-Wire routing groove, 604-Second screw hole.
[0033] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation
[0034] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.
[0035] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.
[0036] This invention provides a high-temperature strain sensor testing device, such as... Figures 1 to 6 As shown, the device includes multiple horizontally parallel supports 1. A sensor clamp 2 is provided on the front end face of the foremost support 1. Each support 1 has a wire rod positioning hole 101 in the middle of its upper part. A wire rod 3 is provided in all the wire rod positioning holes 101. The axial front end of the wire rod 3 passes through the foremost support 1 and is placed in the sensor clamp 2. The axial rear end of the wire rod 3 passes out of the last support 1. The impact rod 4 is made of the same material as the wire rod 3.
[0037] Each bracket 1 has multiple impact rod positioning holes 102 vertically opened in the middle of its lower part. The impact rod positioning holes 102 on different brackets 1 correspond one-to-one, forming multiple sets of impact rod positioning holes 102. An impact rod 4 is provided in one set of impact rod positioning holes 102.
[0038] The sensor fixture 2 includes an L-shaped fixture body 201. The front end face of the L-shaped fixture body 201 has a vertically downwardly connected thread rod positioning hole 202, a sensor positioning groove 203, and a fastening plate positioning groove 204. The lower part of the inner wall of the fastening plate positioning groove 204 has an impact rod through hole 205. The thread rod positioning hole 202 is provided with the axial front end of a thread rod 3, and the axial front end of the thread rod 3 is flush with the front end face of the L-shaped fixture body 201. A high-temperature strain sensor 5 to be tested is vertically mounted in the sensor positioning groove 203. The lower part of the high-temperature strain sensor 5 passes through the sensor positioning groove 203 and the fastening plate positioning groove 204 in sequence, and is in perpendicular contact with the impact rod 4 passing through the impact rod through hole 205. A fastening plate 6 is provided in the fastening plate positioning groove 204, and an electrode post 7 is provided on the fastening plate 6, which is in contact with the high-temperature strain sensor 5.
[0039] In the above technical solution, during use, the impact rod 4 is passed through the impact rod positioning hole 205 on the bracket 1, and its front end is in contact with the central axis of the high-temperature strain sensor 5 to be tested. Under high temperature, the impact rod 5 and the threading rod 3 undergo synchronous thermal expansion, so that the axial front end of the impact rod 4 is always in contact with the rear of the high-temperature strain sensor 5 to be tested, thus eliminating the influence of the fixture's thermal expansion on the test results.
[0040] By fixing only one side of the high-temperature strain sensor under test and using the same material to make the entire device, the thermal expansion of the fixture at high temperatures will not affect the sensor itself. This eliminates the influence of the fixture's thermal expansion on the test results, avoids frequent calibration of the test device during the test, improves the accuracy of high-temperature testing, and solves the technical problem that existing test devices are difficult to test the mechanical properties of sensors under high-temperature conditions.
[0041] The entire device can be made of high-temperature resistant insulating materials or other high-temperature resistant materials with surface insulation treatment. The range of materials is wide, and it no longer relies on special materials with extremely low thermal expansion coefficients. The processing difficulty of each component is low, which reduces the difficulty and cost of manufacturing process.
[0042] This device has a wide applicable temperature range. Since it eliminates the influence of the thermal expansion of the fixture on the test results, it can be used below the melting point temperature of the selected material. If 99% alumina is used, the operating temperature can reach up to 1700℃, which greatly expands the temperature range of high-temperature strain testing.
[0043] Preferably, the fastening plate 6 is made of a material with good insulation properties, such as 99% aluminum oxide; the electrode post 7 is made of a high-temperature resistant metal post, such as Pt and W.
[0044] Specifically, the fastening plate 6 includes a body 601, a pair of electrode post positioning grooves 602 are provided in the middle of the body 601, and a pair of wiring grooves 603 are provided directly above the pair of electrode post positioning grooves 602 and are connected to each other; an electrode post 7 is provided in each of the pair of electrode post positioning grooves 602, and the wires of the electrode post 7 pass through the corresponding wiring grooves 603 and the two axial through holes 8 opened on the wire rod 3 in sequence and are connected to the external source meter; one end of the electrode post 7 extending out of the electrode post positioning groove 602 contacts the high temperature strain sensor 5 to be measured.
[0045] In the above technical solution, the physical contact between the electrode post and the high-temperature strain sensor under test avoids the direct welding of wires to the high-temperature strain sensor under test, thereby avoiding the damage caused by welding wires to the high-temperature strain sensor under test and extending the life of the high-temperature strain sensor under test; in addition, by setting up wiring channels and wire rods, the wires of the device are made more orderly.
[0046] Specifically, a fixing rod positioning hole 103 is provided at the same position on the lower part of all brackets 1, and a fixing rod 9 is provided in multiple fixing rod positioning holes 103 to ensure the parallelism of multiple brackets 1.
[0047] Specifically, a first screw hole 206 is provided on the inner wall of the fastener positioning groove 204.
[0048] In the above technical solution, the first screw hole 206 is used to fix the fastening piece 6 in the fastening piece positioning groove 204 by screws.
[0049] Specifically, the depth of the fastener positioning groove 204 is 1mm greater than the thickness of the fastener 6.
[0050] In the above technical solution, it is convenient to perform strain response testing on the high-temperature strain sensor 5 under reverse bending.
[0051] Specifically, the width of the sensor positioning groove 203 is the same as the width of the high-temperature strain sensor 5 to be tested.
[0052] In the above technical solution, the central axis of the high-temperature strain sensor 5 to be tested is ensured to be parallel to the central axis of the sensor fixture 2.
[0053] Specifically, the top surface of the L-shaped fixture body 201 is arc-shaped to ensure coaxiality.
[0054] Specifically, the foremost bracket 1 has multiple positioning pin holes 104, and the axial rear end face of the L-shaped fixture body 201 has multiple positioning pins 207 corresponding to the positioning pin holes 104, which are used to make the sensor fixture 2 parallel to the bracket 1 on the left and right symmetrical planes, so as to ensure that the impact rod 4 acts on the vertical central axis position of the high temperature strain sensor 5 to be measured.
[0055] Specifically, the main body 601 has second screw holes 604 on both sides.
[0056] In the above technical solution, during testing, screws are used to fix the fastening plate 6 to the sensor fixture 2 and make the electrode post 7 in close contact with the electrode pins on the high-temperature strain sensor 5 to be tested.
Claims
1. A high-temperature strain sensor testing device, comprising multiple supports (1) arranged parallel to each other along a horizontal direction, characterized in that, A sensor clamp (2) is provided on the front end face of the foremost bracket (1); a first threading rod positioning hole (101) is provided in the middle of the upper part of each bracket (1), and a threading rod (3) is provided in all the first threading rod positioning holes (101). The axial front end of the threading rod (3) passes through the foremost bracket (1) and is placed in the sensor clamp (2); the axial rear end of the threading rod (3) passes out of the last bracket (1). Each of the brackets (1) has multiple impact rod positioning holes (102) vertically opened in the middle of the lower part. The impact rod positioning holes (102) on different brackets (1) correspond one to one to form multiple sets of impact rod positioning holes (102). An impact rod (4) is provided in one set of impact rod positioning holes (102). The impact rod (4) is made of the same material as the threading rod (3). The sensor fixture (2) includes an L-shaped fixture body (201). The front end face of the L-shaped fixture body (201) is provided with a second threading rod positioning hole (202), a sensor positioning groove (203), and a fastening plate positioning groove (204) connected in a vertical downward direction. The lower part of the inner wall of the fastening plate positioning groove (204) is provided with an impact rod through hole (205). The axial front end of the threading rod (3) is provided in the second threading rod positioning hole (202), and the axial front end of the threading rod (3) is connected to the front end face of the L-shaped fixture body (201). The sensor positioning groove (203) is vertically mounted with a high-temperature strain sensor (5) to be tested. The lower part of the high-temperature strain sensor (5) to be tested passes through the sensor positioning groove (203) and the fastening plate positioning groove (204) in sequence, and is in perpendicular contact with the impact rod (4) that passes through the impact rod through hole (205). A fastening plate (6) is provided in the fastening plate positioning groove (204). An electrode post (7) is provided on the fastening plate (6). The electrode post (7) is in contact with the high-temperature strain sensor (5) to be tested. The fastening plate (6) includes a body (601), and a pair of electrode post positioning grooves (602) are provided in the middle of the body (601). A pair of wiring grooves (603) are provided directly above the pair of electrode post positioning grooves (602) and are connected to each other. Each pair of electrode post positioning grooves (602) is provided with an electrode post (7). The wires of the electrode post (7) pass through the corresponding wiring grooves (603) and the two axial through holes (8) opened on the wire rod (3) and are connected to the external source meter. One end of the electrode post (7) extending out of the electrode post positioning groove (602) contacts the high temperature strain sensor (5) to be measured.
2. The high-temperature strain sensor testing device as described in claim 1, characterized in that, All of the brackets (1) have a fixing rod positioning hole (103) at the same position on the lower part, and a fixing rod (9) is provided in all of the fixing rod positioning holes (103).
3. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The inner wall of the fastening plate positioning groove (204) is provided with a first screw hole (206).
4. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The depth of the fastener positioning groove (204) is 1 mm greater than the thickness of the fastener (6).
5. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The width of the sensor positioning groove (203) is the same as the width of the high-temperature strain sensor (5) to be tested.
6. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The top surface of the L-shaped fixture body (201) is arc-shaped.
7. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The foremost bracket (1) has multiple positioning pin holes (104), and the axial rear end face of the L-shaped clamp body (201) has multiple positioning pins (207) that correspond one-to-one with the positioning pin holes (104).
8. The high-temperature strain sensor testing device as described in claim 1, characterized in that, The main body (601) has second screw holes (604) on both sides.