CN209673840U - A dumbbell slider type fiber optic accelerometer - Google Patents

Abstract

The utility model provides a dumbbell slider type optical fiber acceleration sensor. Three chambers are sequentially opened in the casing along the length direction. The main body of the cross bar in the middle is arranged in the middle chamber, the middle part of the main body of the cross bar is sleeved and fixed with an annular block, the two ends of the main body of the cross bar at both ends of the annular block are respectively sleeved with springs, and the two ends of the main body of the cross bar extend through the through holes respectively. In the chambers at both ends, a reflective sheet is fixed on the outer side of the raised part of one end of the crossbar main body, and the inner wall of the cavity where the raised part is located is provided with an optical fiber hole facing the reflective sheet, and the optical fiber bundle extends from the outside of the casing. Into the fiber hole, the fiber bundle includes an incident fiber and a receiving fiber. In order to solve the problem that the existing acceleration sensor is not applicable in many occasions, the practicability is not strong, and the actual acceleration measurement requirements cannot be met. The utility model belongs to the technical field of optical fiber sensing.

Description

A dumbbell slider type fiber optic accelerometer

technical field

The utility model relates to a dumbbell slider type optical fiber acceleration sensor and an optical fiber acceleration sensor made by using the probe, belonging to the technical field of optical fiber sensing.

Background technique

In modern industrial production, especially in the automated production process, various sensors are often used to monitor and control various parameters in the production process, so that the equipment can work in a normal or optimal state, and the products can achieve the best quality. Sensors have also penetrated into extremely broad fields such as industrial production, space development, ocean exploration, environmental protection, resource survey, medical diagnosis, bioengineering, and even cultural relics protection. The utility model is one of many types of sensors - an acceleration sensor. With the development of sensor technology, a variety of acceleration sensors have appeared, usually composed of mass blocks, dampers, elastic elements, sensitive elements and adaptive circuits. During the acceleration process of the sensor, the acceleration value is obtained by using Newton's second law by measuring the inertial force on the mass block. According to the different sensitive components of the sensor, common acceleration sensors include capacitive, inductive, strain, piezoresistive, piezoelectric, etc., which have the limitations of low measurement accuracy and high energy consumption, and are not well suited for many occasions. .

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a dumbbell slider-type optical fiber acceleration sensor to solve the problem that the existing acceleration sensor is not suitable for many occasions, has low practicability and cannot meet the actual acceleration measurement requirements.

The scheme of the utility model is as follows: a dumbbell slider type optical fiber acceleration sensor, comprising a sensor probe, a light source, a Y-type coupler, an optical fiber, a photoelectric converter and a signal processor, and the light source is arranged at one end of the optical fiber for generating the optical fiber signal, The optical signal emitted by the light source is coupled into the optical fiber, and is divided into a detection optical fiber and a reference optical fiber after passing through the Y-type coupler. , the second chamber and the third chamber, the two ends of the second chamber are respectively provided with through holes communicating with the first chamber and the third chamber, and the dumbbell-type slider is arranged on the shell along the length direction of the shell In the body, the main body of the cross bar in the middle of the dumbbell-type slider is arranged in the second chamber, the middle part of the main body of the cross bar is sleeved and fixed with an annular block, and the main bodies of the cross bar at both ends of the annular block are respectively sleeved with springs, and the two springs are respectively sleeved. The ends are respectively connected or pressed on the end of the annular block and the inner wall of the end of the second chamber. Both ends are provided with protruding parts, and the size of the protruding parts is larger than the diameter of the through hole, and a reflective sheet is fixed on the outer side of one protruding part along the direction perpendicular to the length of the casing, and the cavity where the protruding part is located is located. On the inner wall, an optical fiber hole is opened along the length direction of the casing at the position facing the reflective sheet, and the optical fiber bundle extends into the optical fiber hole from the outside of the casing. The optical fiber bundle includes an incident optical fiber and a receiving optical fiber, and the detection optical fiber is connected to the optical fiber bundle. , and as the incident fiber of the fiber bundle, the outgoing fiber and the reference fiber of the fiber bundle in the sensor probe are respectively connected with a photoelectric converter, and the photoelectric converters are all connected with the signal processor.

In the aforementioned acceleration sensor probe, a spring is sleeved on the main body of the cross bar at both ends of the annular stopper, and the springs at both ends of the annular stopper are uniformly arranged between the annular stopper and the end of the second chamber.

In the aforementioned acceleration sensor probe, both the first chamber and the third chamber are provided with air holes that communicate with the outside of the casing, and a filter screen is fixed on the air holes for filtering the gas passing through the air holes.

In the aforementioned acceleration sensor probe, the casing is formed by buckling two casing structures with semicircular cross-sections, and the two casing structures are buckled and fixed by welding or screw connection.

In the aforementioned acceleration sensor probe, in the dumbbell-type slider, the outer sides of the raised portions at both ends are plane structures perpendicular to the main body of the crossbar, and the reflective sheet is attached and fixed to the middle of the outer side surface of the raised portion.

In the aforementioned acceleration sensor probe, the diameter of the two ends of the through hole is larger than the diameter of the middle part, that is, the longitudinal section of the through hole is two oppositely arranged conical or conical structures, and the diameter of the through hole is equal to or slightly larger than that of the main body of the crossbar. Diameter, so that the main body of the crossbar and the through hole are in line contact, reducing friction.

In the aforementioned acceleration sensor probe, the upper side of the housing is provided with a refueling hole connecting the outside of the housing and the middle of the through hole, so that lubricating oil can be added to the middle of the through hole through the oil filling hole, and the gap between the main body of the crossbar and the through hole is further reduced. The friction force between them is negligible.

Compared with the prior art, the utility model has the following main advantages: through structural design, theoretical research and experimental analysis, it can be known that the sensor probe has a smaller structure, higher accuracy and reliability, better adaptability and interaction It has the advantages of interchangeability and other advantages, and is extremely practical. After the output signal is calculated by photoelectric conversion and signal processing, the output value will be doubled, thereby improving the detection sensitivity. The sensor can be applied to multiple acceleration detection occasions.

At the same time, the acceleration sensor probe adopts a dumbbell-type slider structure as an acceleration detection device. When detecting acceleration, the dumbbell-type slider slides laterally, and the acceleration value can be calculated only according to the movement amount of the dumbbell-type slider. The requirements of sensor are lower, the calculation and measurement are simpler, and the structure of the dumbbell-type slider is more stable, less susceptible to external interference, less damage, and has a longer service life, making the sensor reliable, adaptable and interchangeable. It has made great progress and is suitable for the measurement of acceleration; the strength compensation principle of the sensor is simpler and more practical.

Description of drawings

FIG. 1 is a schematic structural diagram of the present utility model (the probe part is a cross-sectional view).

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

Example:

Referring to FIG. 1 , this embodiment provides a dumbbell slider-type optical fiber acceleration sensor, including a sensor probe, a photoelectric converter 17 and a signal processor 18, a sensor probe housing 1, and the housing 1 is a straight cylindrical structure. 1 is formed by buckling two shell structures with a semicircular cross section, the two shell structures are fastened and fixed by welding or screw connection, etc., and the shell 1 is provided with a first cavity in sequence along the length direction. The chamber 2, the second chamber 3 and the third chamber 4, the first chamber 2 and the third chamber 4 are all provided with air holes 12 connected to the outside of the casing 1, and a filter screen is fixed on the air holes 12 for The gas passing through the air hole 12 is filtered, the two ends of the second chamber 3 are respectively provided with through holes 5 which communicate with the first chamber 2 and the third chamber 4, and the dumbbell-type slider 6 is arranged along the length direction of the casing 1 In the housing 1 , the crossbar main body 61 in the middle of the dumbbell-type slider 6 is arranged in the second chamber 3 , the middle of the crossbar main body 61 is sleeved and fixed with an annular block 7 , and the crossbar main body at both ends of the annular block 7 is sleeved. 61 is respectively sleeved with a spring 8, and the springs 8 at both ends of the annular block 7 are arranged between the annular block 7 and the end of the second chamber 3, preferably, the casing 1 is statically arranged in the transverse direction. In this case, the springs 8 at both ends of the annular stopper 7 are in a natural state, that is, neither compressed nor extended, and the two ends of the crossbar body 61 extend to the first chamber 2 and the third chamber 4 through the through holes 5 respectively. The diameter of the two ends of the through hole 5 is larger than the diameter of the middle part, that is, the longitudinal section of the through hole 5 is two oppositely arranged conical or conical-like structures, and the diameter of the through hole 5 is equal to or slightly larger than that of the crossbar body 61 . The diameter of the crossbar body 61 and the through hole 5 are in line contact (the cross section is point contact) to reduce the frictional force. The oil filling hole 13 is convenient for adding lubricating oil to the middle of the through hole 5 through the oil filling hole 13, which further reduces the friction force between the crossbar main body 61 and the through hole 5, so that the friction force can be ignored. The refueling hole 13 is filled with a rubber plug 19 to prevent impurities such as dust from entering the interior of the housing 1 when refueling is not required. The two ends of the crossbar main body 61 are provided with raised portions 62, and the size of the raised portions 62 is larger than that of the through hole. 5 diameter (preferably, the dumbbell-type slider 6 is an integral structure), in the dumbbell-type slider 6, the outer sides of the raised parts 62 at both ends are all plane structures perpendicular to the crossbar main body 61, and one of the raised parts The middle part of the outer side of the 62 is attached and fixed with a reflective sheet 9 (the reflective mirror can be fixed by bonding), and the convex part 62 is located on the inner wall of the chamber, facing the reflective sheet 9 along the housing 1. An optical fiber hole 10 is opened in the length direction, and the optical fiber bundle 11 extends from the outside of the housing 1 to the optical fiber hole 10, and the optical fiber bundle 11 is perpendicular to the reflector 9. The optical fiber bundle 11 includes an incident optical fiber and a receiving optical fiber, and the light source 14 is arranged in the optical fiber. One end of 16 is used to generate an optical fiber signal, and the optical signal emitted by the light source 14 is coupled into the optical fiber 16, and is divided into a detection optical fiber 161 and a reference optical fiber 162 after passing through the Y-type coupler 15, and the detection optical fiber 161 is connected to the optical fiber bundle 11. As the incident fiber of the fiber bundle 11, The outgoing optical fiber and the reference optical fiber 162 of the optical fiber bundle 11 in the sensor probe are individually connected to a photoelectric converter 17 , and the photoelectric converters 17 are all connected to the signal processor 18 .

The usage of the above acceleration sensor is as follows:

The sensor probe is fixed on the object to be inspected, and the length direction of the housing 1 is set along the direction of acceleration to be inspected;

The light signal from the light source 14 is coupled into the optical fiber 16, and then divided into two paths by the Y-type coupler 15. One is the detection fiber 161 that reaches the fiber bundle 11 and serves as the incident fiber, and is irradiated on the reflector 9. After reflection, the The reflected light is received by the receiving fiber of the fiber bundle 11, and is transmitted to the photoelectric converter 17 for photoelectric conversion by the receiving fiber, and then the signal is input to the signal processor 18 for signal processing; the other path is directly transmitted to the photoelectric converter 17 as a reference fiber 162 After photoelectric conversion, it is also input to the signal processor 18 for signal processing, and the signal processor 18 performs a ratio calculation on the two signals to obtain the spring 8 on both sides of the annular stop 7 in the sensor probe relative to the probe static state. The deformation variable x can be calculated from the formula F=ma, F=F ₁ +F ₂ =k ₁ x+k ₂ x to obtain the value of the acceleration a, where F represents that the springs 8 on both sides of the annular block 7 are subjected to The sum of the axial forces, F ₁ and F ₂ respectively represent the axial force of the springs 8 on both sides of the annular block 7, k ₁ and k ₂ respectively represent the elastic coefficients of the springs 8 on both sides of the annular block 7, m represents The total mass of the dumbbell-type slider 6 and the annular block 7, a represents the acceleration of the dumbbell-type slider 6 and the annular block 7, after the dumbbell-type slider 6 and the annular block 7 are balanced, the dumbbell-type slider 6 and the annular block 7 are balanced. The acceleration of 6 and the annular stop 7 is equal to the acceleration of the object to be inspected.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (3)

1. a kind of dumbbell slide block type optical fiber acceleration transducer, it is characterised in that: including sensor probe, light source (14), Y type coupling Clutch (15), optical fiber (16), photoelectric converter (17) and signal processor (18), light source (14) are set to one end of optical fiber (16) For generating fiber-optic signal, the optical signal that light source (14) issues is coupled into optical fiber (16), divides after Y type coupler (15) For detection fiber (161) and reference optical fiber (162), sensor probe includes shell (1), and shell (1) is straight tubular construction, shell (1) first chamber (2), second chamber (3) and third chamber (4) are successively offered along its length in, the two of second chamber (3) End offers the through-hole (5) being connected with first chamber (2) and third chamber (4) respectively, and dumbbell type sliding block (6) is along shell (1) Length direction be set in shell (1), the cross bar main body (61) in the middle part of dumbbell type sliding block (6) is set in second chamber (3), It is arranged and is fixed with collar stop (7) in the middle part of cross bar main body (61), covered respectively in the cross bar main body (61) at collar stop (7) both ends Both ends equipped with spring (8), and spring (8) are separately connected or press the end set on collar stop (7) and the end of second chamber (3) On portion's inner wall, both ends difference via through holes (5) of cross bar main body (61) is extended in first chamber (2) and third chamber (4), cross bar master The both ends of body (61) are provided with lug boss (62), and the size of lug boss (62) is greater than the diameter of through-hole (5), wherein a lug boss (62) it is fixed with reflecting piece (9) on outside along the direction perpendicular to shell (1) length, and chamber where the lug boss (62) On inner wall, the length direction at face reflecting piece (9) along shell (1) is offered optic fibre hole (10), and fiber optic bundle (11) is by shell (1) Outside extend in optic fibre hole (10), fiber optic bundle (11) includes incident optical and reception optical fiber, detection fiber (161) access To fiber optic bundle (11), and the incident optical as fiber optic bundle (11), the output optical fiber and ginseng of fiber optic bundle (11) in sensor probe It examines optical fiber (162) to be individually connected with a photoelectric converter (17), the photoelectric converter (17) is and signal processor (18) it is connected, the shell (1) is that semicircular shell structure fastens by two cross sections, is led between two shell structures It crosses welding or screw connecting mode is fastened, be vertical on the outside of the lug boss (62) at both ends in the dumbbell type sliding block (6) Directly in the planar structure of cross bar main body (61), the middle part of the lateral surface of lug boss (62), institute are fixed in reflecting piece (9) fitting The diameter for stating through-hole (5) both ends is greater than the diameter at middle part, i.e. the longitudinal section of through-hole (5) is two pyramidal structures being oppositely arranged, The diameter of through-hole (5) is equal to the diameter of cross bar main body (61).

2. a kind of dumbbell slide block type optical fiber acceleration transducer according to claim 1, it is characterised in that: the collar stop (7) spring (8) is arranged in the cross bar main body (61) at both ends respectively, and the spring (8) at collar stop (7) both ends is pressed and set Between collar stop (7) and the end of second chamber (3).

3. a kind of dumbbell slide block type optical fiber acceleration transducer according to claim 1, it is characterised in that: first chamber (2) It is connected to the external stomata (12) of shell (1) with offering in third chamber (4), stomata is fixed with strainer on (12).