Tooling for optical wedge manufacturing and optical wedge manufacturing method

Abstract

The present invention discloses a tool for manufacturing an optical wedge and a method for manufacturing an optical wedge. The optical wedge comprises two pieces of flat glass at an angle. The tool includes: a positioning groove adapted to fit the two pieces of flat glass so that the two pieces of flat glass can be positioned and installed within the positioning groove; a spacer bayonet for positioning a standard spacer; and a plurality of glue dispensing grooves, such that the gap between the two pieces of flat glass installed in the positioning groove and separated by the standard spacer is exposed within the glue dispensing groove. The optical wedge is manufactured using a method different from the prior art. After the two pieces of flat glass are positioned using the tool, the gap between the two pieces of flat glass is adjusted using a standard spacer. The precision of the standard spacer is used to control the precision of the manufactured optical wedge, resulting in low cost and easy mass production. The precision of the optical wedge manufactured using the tool and method can meet the requirements of fiber-optic F-P sensors based on Fizeau interferometer demodulation, where the initial cavity length cannot be precisely controlled.

Description

Technical Field

[0001] The present invention relates to the field of medical intracranial pressure monitors, and in particular to a tooling for manufacturing an optical wedge and a method for manufacturing the optical wedge. Background Art

[0002] Normal intracranial pressure (ICP) in humans ranges from 0.9 to 2.0 kPa. Various neurological diseases can cause elevated ICP. Therefore, monitoring ICP is crucial in the clinical treatment of various neurological conditions, including intracranial injury, cerebrovascular disease, and meningitis. Intraventricular catheters and dural bolts are commonly used to monitor ICP, but these methods have drawbacks such as difficulty in puncture, limited local pressure measurement, and increased infection risk. In recent years, minimally invasive treatments using sensor systems have become another important approach for monitoring ICP. Fiber optic sensors, compared to electrical sensors, have attracted considerable attention due to their electromagnetic compatibility, small size, high sensitivity, and high resolution. Fiber optic Fabry-Perot sensors are the oldest, most technologically mature, and most widely used type of fiber optic sensor. It creates two highly reflective layers within an optical fiber to form a microcavity. When a coherent light beam is incident on this microcavity along the optical fiber, the two highly reflective layers reflect a portion of the light and return along the original path, where they meet and produce interference. The interference signal is related to the length of the microcavity. When a certain pressure is applied to the microcavity, the cavity length changes, and the interference output signal also changes. Therefore, by demodulating the cavity length of the interference output signal, the sensing of various external parameters can be achieved.

[0003] In recent years, various fiber optic Fabry-Perot sensors with high sensitivity and resolution that can meet the requirements of intracranial pressure measurement have been proposed. They have the following characteristics: (1) biocompatibility; (2) small size; (3) sufficiently high sensitivity, resolution, and dynamic range; and (4) a demodulation system capable of monitoring small pressure changes. Under the action of intracranial pressure, the range of change in the length of the microcavity in the fiber optic Fabry-Perot sensor corresponds to the change in intracranial pressure. Due to the characteristics of intracranial pressure changes, the length of the microcavity of the fiber optic Fabry-Perot sensor needs to be controlled at the order of tens of microns to achieve linear sensing of intracranial pressure. The difficulty and cost of the manufacturing process for accurately controlling the cavity length can be imagined. Therefore, the use of a cavity length demodulation method that does not require high accuracy of the initial cavity length is an effective way to reduce the difficulty and cost of processing, which is of great significance to the widespread application of fiber optic FP sensors in the field of intracranial pressure measurement.

[0004] There are two main types of signal demodulation for fiber FP sensors: intensity demodulation and phase demodulation. Intensity demodulation is simple but results in large errors, while phase demodulation is precise but relatively accurate, making it the more common method. Common phase demodulation methods include fringe counting, Fourier transform, and correlation. Fringe counting and Fourier transform rely on demodulation hardware, such as a high-precision spectrometer or a scanning light source. However, spectrometers are bulky, expensive, and slow to acquire data. The accompanying demodulation algorithms are complex and time-consuming, making these methods unsuitable for practical engineering applications, especially for real-time intracranial pressure monitoring. In contrast, correlation methods, which utilize optical components to perform correlation operations, are more suitable for practical engineering applications.

[0005] For example, the Fizeau interferometer demodulation method in the correlation method has excellent long-term reliability, relatively simple hardware, and a relatively intuitive demodulation algorithm. This demodulation method is very suitable for demodulating fiber FP sensors where the initial cavity length cannot be precisely controlled. However, this demodulation method requires a high-precision optical wedge with an extremely small inclination angle to construct an interference signal that matches the microcavity length in the fiber optic sensor to achieve correlation calculations. According to the specifications of existing photodetector linear arrays, the wedge angle must be on the order of 0.1° and achieve a processing accuracy of seconds. In addition, the assembly accuracy of optical components such as collimating lenses and cylindrical mirrors, as well as the photodetector array, also has extremely high requirements. Therefore, the overall price of this type of demodulator is still relatively high, and it has not been widely used in the medical industry.

[0006] Optical wedge processing methods commonly used include parallel light adhesive pads, high-precision wedge glass fixture replication, wedge metal fixtures, and single-piece wedge angle modification and placement. Of these methods, only the high-precision wedge glass fixture method can mass-produce small-sized, small-angle, and second-degree precision wedge angle optical wedge parts. This process utilizes the internal offset relationship between the finished wedge angle of the part and the wedge glass fixture after the part is assembled with the high-precision wedge glass fixture. After the part is bonded to the wedge glass fixture, the excess is ground off to achieve the desired wedge angle. This process requires a wedge glass fixture with higher wedge angle accuracy. However, these higher-precision wedge glass fixtures themselves have higher processing requirements, greater processing difficulty, longer production cycles, lower processing efficiency and yield, and higher production costs. This makes them unsuitable for the medical field, where small quantities of individual parts are required.

[0007] Therefore, when demodulating a fiber FP sensor whose initial cavity length cannot be precisely controlled based on a Fizeau interferometer, there is an urgent need for a glass wedge manufacturing tooling and manufacturing method that can more economically meet engineering mass production applications. Summary of the Invention

[0008] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions:

[0009] A tool for manufacturing an optical wedge, wherein the optical wedge is a transparent optical element having a wedge-shaped interface, the optical wedge comprising two pieces of flat glass, the angle between the two pieces of flat glass being less than 1 / 10 of a radian, the distance between the wedge-shaped interfaces gradually and continuously changing along the direction from the intersection of the two sides of the angle toward the open end, and the refractive index of the flat glass remaining unchanged, the tool comprising:

[0010] a positioning groove adapted to fit the two pieces of flat glass so that the two pieces of flat glass can be positioned and inserted into the positioning groove; the positioning groove comprises a bottom and side walls, and after the two pieces of flat glass are inserted into the positioning groove, a gap of no more than a predetermined distance exists between the side walls and the flat glass, so that the flat glass can be placed into the positioning groove without shaking along its bottom beyond the predetermined distance; an open space is left at the top opposite to the bottom, so that the flat glass away from the bottom can be adapted to move a certain angle and displacement relative to the flat glass adjacent to the bottom, thereby adjusting the angle and relative position between the two pieces of flat glass; a spacer bayonet is provided on the side wall for positioning a standard spacer, and after the flat glass adjacent to the bottom is inserted into the positioning groove, the standard spacer can be tightly abutted against the upper surface of the flat glass adjacent to the bottom through the spacer bayonet, so that the gap between the two pieces of flat glass can be precisely adjusted, the upper surface being the surface facing the gap between the two pieces of flat glass; a clearance groove is provided at the bottom to avoid the effective working surface of the flat glass, so that the flat glass only contacts the bottom at the outer periphery of the edge;

[0011] A plurality of glue dispensing grooves are arranged on the side wall so that the gap between the two flat glass sheets inserted into the positioning groove and separated by the standard spacers is exposed in the glue dispensing grooves.

[0012] Preferably, the side walls include a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged opposite to each other in the width direction of the positioning groove, and the third side wall and the fourth side wall are arranged opposite to each other in the length direction of the positioning groove; the gap between the two pieces of flat glass installed in the positioning groove and separated by the standard spacer gradually increases away from the third side wall along the length direction.

[0013] Preferably, the clearance groove extends along the length direction of the positioning groove and penetrates the fourth side wall. The notch of the clearance groove on the fourth side wall extends upward along the fourth side wall away from the bottom until it penetrates the top end of the fourth side wall. This has the beneficial effect of making the positioning groove easier to process.

[0014] Preferably, the first side wall and the second side wall are both provided with a first section on a side close to the fourth side wall, and the first section is parallel to the fourth side wall and staggered by the same preset distance in the longitudinal direction;

[0015] After the flat glass adjacent to the bottom is installed in the positioning groove, the end surface of the fourth side wall away from the bottom is not higher than the upper surface of the flat glass adjacent to the bottom, and the connection end between the first section and the fourth side wall is not higher than the upper surface of the flat glass adjacent to the bottom;

[0016] The first section and the end surface of the fourth sidewall distal from the bottom form the spacer snap-in. The standard spacer is a spacer having at least one flat end surface. The spacer snap-in allows the flat end surface of the standard spacer to be in close contact with the first section. This advantageously allows the gap between the two sheets of flat glass to be precisely adjusted by utilizing the thickness of the spacer and the preset offset distance.

[0017] Preferably, the first and second side walls are symmetrically provided with optical fiber slots, each of which is offset from the third side wall by the same preset distance in the longitudinal direction. The standard spacer is an optical fiber with a standard core diameter. This advantageously allows for precise adjustment of the gap between the two glass sheets by utilizing the optical fiber core diameter and the preset offset distance.

[0018] Preferably, the first and second side walls are each provided with a second section on a side proximal to the third side wall, the second section being offset from the third side wall by a predetermined distance in the longitudinal direction; and the glue dispensing groove being provided between the second section and the third side wall. This advantageously provides space for machining the arcuate section of the third side wall, facilitating machining.

[0019] Preferably, the third side wall is provided with a dispensing groove, and the first side wall and the second side wall are symmetrically provided with a plurality of dispensing grooves.

[0020] Preferably, the tool further comprises a pressing block, which is connected to the side wall via a rotating shaft, and is used for pressing the combination of the two flat glass pieces and the standard spacer installed in the positioning groove during dispensing.

[0021] A method for manufacturing an optical wedge, using the tooling of the above technical solution, comprises the following steps:

[0022] S1. Prepare two pieces of flat glass of the same material, both made of optical glass transparent material, one side of the flat glass is coated with an antireflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio;

[0023] S2. Place the flat glass adjacent to the bottom into the positioning groove along the side wall so that the side of the flat glass coated with the antireflection film is close to the bottom and the side coated with the semi-transparent and semi-reflective film faces upward;

[0024] S3. Place a standard spacer into the spacer mount so that the standard spacer is in close contact with the upper surface of the flat glass adjacent to the bottom, where the upper surface is coated with a semi-transparent and semi-reflective film;

[0025] S4, placing the flat glass away from the bottom into the positioning groove along the side wall and close to the standard spacer, so that the two surfaces coated with the semi-transparent and semi-reflective films face each other and abut against the flat glass placed in step S1 at one end to form an angle;

[0026] S5, compacting the assembly formed in the above steps, and performing glue dispensing and curing along a plurality of glue dispensing grooves;

[0027] S6. Clean the glue that overflows from the end surface and remove the portion of the standard spacer that extends beyond the end surface;

[0028] The order of steps S3 and S4 can be interchanged.

[0029] Preferably, the standard spacer is a standard film made of an organic material or an optical fiber with a standard core diameter.

[0030] Compared with the prior art, the present invention has the following advantages: an optical wedge is manufactured using a method different from the prior art, two pieces of flat glass are positioned using a tool, and the gap between the two pieces of flat glass is adjusted using a standard spacer. The precision of the manufactured optical wedge is controlled by the precision of the standard spacer, resulting in low cost and easy mass production. The precision of the optical wedge manufactured using the tool and method can meet the requirements of a fiber optic FP sensor based on Fizeau interferometer demodulation, in which the initial cavity length cannot be precisely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 FIG. 4 is a schematic diagram of the assembly of an optical wedge according to an embodiment of the present invention.

[0033] Figure 2 Schematic diagram of tooling in one embodiment of the present invention.

[0034] Figure 3 FIG. 4 is another schematic diagram of assembling an optical wedge according to an embodiment of the present invention.

[0035] Figure 4 Schematic diagram of the assembly of an optical wedge in one embodiment of the present invention, wherein the tooling is provided with a pressing plate.

[0036] Figure 5 for Figure 4 sectional view of .

[0037] Figure 6 Schematic diagram of tooling, flat glass, and standard spacers used in one embodiment of the present invention.

[0038] Figure 7 This is another schematic diagram of the tooling, flat glass, and standard spacers used in one embodiment of the present invention.

[0039] Figure 8 FIG. 1 is a schematic diagram of a top view of an optical sensing device integrated with an optical wedge according to an embodiment of the present invention.

[0040] Figure 9 for Figure 8 Schematic diagram of the FP sensor at the left end enlarged in the BB direction schematic diagram in FIG.

[0041] Figure 10 for Figure 8 Schematic diagram of BB direction in .

[0042] Figure 11 for Figure 10 Schematic diagram of the CC direction.

[0043] Figure 12 Schematic diagram of the optical wedge. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In the present invention, optical fiber FP sensor, optical fiber Fabry-Perot sensor and Fabry-Perot sensor are synonymous.

[0046] like Figure 1 and Figure 2 As shown, a tool for manufacturing an optical wedge, the optical wedge is a transparent optical element with a wedge-shaped interface, Figure 12 The optical wedge includes two pieces of flat glass 6, one end of the two flat glass 6 is abutted, and the other end is sandwiched by a spacer 30. The angle between the two flat glass is less than 1 / 10 of a radian. Along the intersection of the two sides of the angle toward the open end, the distance between the wedge interfaces gradually and continuously changes while the refractive index of the flat glass remains unchanged. The tooling includes:

[0047] The positioning groove 10 is adapted to fit the two pieces of flat glass 6 so that the two pieces of flat glass 6 can be positioned and installed in the positioning groove 10. Specifically, the cross section of the flat glass perpendicular to the thickness of the flat glass 6 and the cross section of the positioning groove perpendicular to the depth of the positioning groove 10 are adapted, and the height of the wedge-shaped ends of the two pieces of flat glass 6 is lower than the side wall portions with which they abut. The positioning groove 10 includes a bottom 40 and side walls. After the two pieces of flat glass 6 are installed in the positioning groove 10, a gap no greater than a predetermined distance exists between the side walls and the flat glass 6, allowing the flat glass 6 to be placed in the positioning groove without shaking along its bottom beyond the predetermined distance. An open space is left at the top opposite the bottom, allowing the flat glass away from the bottom to move a certain angle and displacement relative to the flat glass adjacent to the bottom, thereby adjusting the angle and relative position between the two pieces of flat glass 6.

[0048] The spacer bayonet is provided on the side wall and is used to position the standard spacer. After the flat glass adjacent to the bottom 40 is installed in the positioning groove 10, the standard spacer can be tightly attached to the upper surface of the flat glass adjacent to the bottom 40 through the spacer bayonet, so that the gap between the two flat glasses 6 can be accurately adjusted. The upper surface is the surface facing the gap between the two flat glasses 6. In actual use, the lower surface of the flat glass away from the bottom 40 also presses the standard spacer. The lower surface is the surface facing the gap between the two flat glasses 6. Figure 2 As shown, the bottom 40 is provided with a clearance groove 404 for avoiding the effective working surface of the flat glass so that the flat glass contacts the bottom 40 only at the periphery of the edge.

[0049] A plurality of glue dispensing grooves 50 are provided on the side wall so that the gap between two pieces of flat glass 6 inserted into the positioning groove 10 and separated by the standard spacer is exposed in the glue dispensing groove 50 .

[0050] In some embodiments, as Figure 1 and Figure 2 As shown, the side walls include a first side wall 101, a second side wall 102, a third side wall 103, and a fourth side wall 104. The first side wall 101 and the second side wall 102 are disposed opposite to each other in the width direction of the positioning groove 10, and the third side wall 103 and the fourth side wall 104 are disposed opposite to each other in the length direction of the positioning groove 10. As the gap between the two flat glasses 6 installed in the positioning groove 10 and separated by the standard spacer increases away from the third side wall 103 along the length direction, the gap gradually increases. In some embodiments, as shown in FIG. Figure 1 and Figure 2As shown, the two pieces of flat glass 6 are in the shape of a cuboid, one end of the two cuboids abuts against the third side wall 103 and is away from the third side wall 103 along the length direction, and the other end is connected by a spacer; in some other embodiments, the two pieces of flat glass 6 may also be in the shape of a cube, or have a cross section that is a partial arc or partial ellipse that is truncated horizontally or vertically.

[0051] In some embodiments, as Figure 2 As shown, the clearance groove 404 extends along the length direction of the positioning groove 40 , and the gap of the clearance groove 404 located on the fourth side wall 104 extends upward along the fourth side wall 104 away from the bottom 40 until it passes through the top of the fourth side wall 104 .

[0052] In some embodiments, as Figure 1 and Figure 2 As shown, a first section 110 is provided on one side of the first side wall 101 and the second side wall 102 close to the fourth side wall 104. The first section 110 is parallel to the fourth side wall 104 and staggered by the same preset distance in the length direction.

[0053] After the flat glass 6 adjacent to the bottom 40 is installed in the positioning groove 10, the end surface of the fourth side wall 104 away from the bottom 40 is no higher than the upper surface of the flat glass 6 adjacent to the bottom 40, and the connection end between the first section 110 and the fourth side wall 104 is no higher than the upper surface of the flat glass 6 adjacent to the bottom 40. In this embodiment, the end surface of the fourth side wall 104 away from the bottom 40 is flush with the upper surface of the flat glass 6 adjacent to the bottom 40, and the connection end between the first section 110 and the fourth side wall 104 is lower than the upper surface of the flat glass 6 adjacent to the bottom 40.

[0054] The first section 110 and the end surface of the fourth side wall 104 away from the bottom 40 form a spacer bayonet. The standard spacer is a spacer gasket 30 with at least one flat end surface. The standard spacer can make the flat end surface close to the first section 110 through the spacer bayonet. Figure 1 As shown, accordingly, the first section 110 is offset from the third side wall 103 by a distance L2, and the gap and wedge angle between the two flat glasses 6 are precisely adjusted by utilizing the thickness of the spacer 30 and the preset offset distance.

[0055] In some embodiments, as Figure 1 and Figure 2 As shown, optical fiber 29 retaining slots 60 are symmetrically provided on the first side wall 101 and the second side wall 102. The optical fiber 29 retaining slots 60 are longitudinally offset from the third side wall 103 by the same preset distance. The standard spacers are optical fibers 29 of standard core diameters. The core diameter of the optical fibers 29 and the preset offset distance L1 are used to precisely adjust the gap and wedge angle between the two sheets of glass 6.

[0056] In some embodiments, as Figure 1-3 As shown, the first side wall 101 and the second side wall 102 are both provided with a second section 120 on one side close to the third side wall 103. The second section 120 and the third side wall 103 are staggered by a preset distance in the length direction. A glue dispensing groove 50 is provided between the second section 120 and the third side wall 103. Figure 1 and Figure 3 The fourth dispensing groove 504 and the sixth dispensing groove 506 are shown. The second section 120 is staggered with the third side wall 103 by a preset distance in the length direction, which is beneficial to leaving space for processing the arc section 90 of the third side wall 103 and facilitating processing.

[0057] In some embodiments, the third side wall 103 is provided with a dispensing groove 50, and the first side wall 101 and the second side wall 102 are symmetrically spaced apart with a plurality of dispensing grooves 50. Figure 1-3 As shown, in this embodiment, the third side wall 103 is provided with a glue dispensing groove 50, namely the fifth glue dispensing groove 505, and the first side wall 101 and the second side wall 102 are symmetrically spaced and each is provided with four glue dispensing grooves 50, which are distributed on the second side wall 102 in sequence, namely the first glue dispensing groove 501, the second glue dispensing groove 502, the third glue dispensing groove 503 and the fourth glue dispensing groove 504, and the sixth glue dispensing groove 506, the seventh glue dispensing groove 507, the eighth glue dispensing groove 508 and the ninth glue dispensing groove 509. Among them, the fourth glue dispensing groove 504 and the sixth glue dispensing groove 506 are open.

[0058] In some embodiments, as Figure 4 and Figure 5 As shown, the fixture also includes a pressure block, which is connected to the side wall via a rotating shaft. The pressure block is used to press the combination of the two flat glass sheets 6 and the standard spacer installed in the positioning groove 10 during glue dispensing. Specifically, the rotating shaft 39 passes through the through holes of the fixture 36 and the pressure block 37. Glue is dispensed from the hole on the pressure block 37 to fix the pressure block shaft 39 and the pressure block 37, so that the pressure block shaft 39 and the pressure block 37 can swing around the through hole of the fixture 36 when the fixture 36 is fixed. One end of the torsion spring 38 passes through the through hole of the rotating shaft 39, and the other end passes through the through hole of the fixture 36. When the system is in Figure 5 In the state shown, the pressing block 37 can press the flat glass 6 assembly.

[0059] A method for manufacturing an optical wedge, using any one of the above-mentioned tools, in this embodiment, as Figure 6 and Figure 7As shown, an optical flat glass 6 with a good surface shape and optical coating is selected. The flat glass 6 has a semi-transparent and semi-reflective film, and the transmission-reflection splitting ratio includes but is not limited to 50 / 50, 60 / 40, 70 / 30, and 80 / 20. A film made of an organic material with controllable thickness precision (such as PDMS organic film, polyimide film, etc.) or an optical fiber 29 with a standard core diameter is also selected. The two flat glasses 6 are a first optical flat glass 611 and a second optical flat glass 622. The first optical flat glass 611 is the flat glass 6 adjacent to the bottom 40, and the second optical flat glass 622 is the flat glass 6 away from the bottom 40.

[0060] The steps include:

[0061] S1. Prepare two pieces of flat glass of the same material, both made of optical glass transparent material, one side of the flat glass is coated with an antireflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio;

[0062] S2. Install the flat glass 6 adjacent to the bottom 40 into the positioning groove 10 along the side wall so that the flat glass 6 is close to the bottom 40 and the side coated with the semi-transparent and semi-reflective film faces upward;

[0063] Specifically, the first optical flat glass 611 is placed between the first surface 1001 and the second surface 1002 of the optical wedge manufacturing tool, facing the fourth surface 1004 of the tool, so that the third surface 63 of the first optical flat glass 611 is in close contact with the third surface 1003 of the optical wedge manufacturing tool, and the second surface 62 of the first optical flat glass 611 is in close contact with the fourth surface 1004 of the optical wedge manufacturing tool; and the fifth surface 65 of the first optical flat glass 611 is in close contact with the ninth surface 1009 of the optical wedge manufacturing tool.

[0064] S3. Place the standard spacer into the spacer mount so that the standard spacer is in close contact with the upper surface of the flat glass 6 adjacent to the bottom 40, where the upper surface is coated with the semi-transparent and semi-reflective film;

[0065] Specifically, the assembly spacer 30 is placed parallel to and between the fourth surface 64 of the first optical flat glass 611 and the second surface 62 of the second optical flat glass 622 until the third surface 33 of the assembly spacer 30 abuts against the seventh surface 1007 and the eighth surface 1008 of the optical wedge manufacturing tool. Alternatively, before placing the second optical flat glass 622, the assembly spacer optical fiber 29 is placed along the optical fiber 29 positioning groove 10 of the optical wedge manufacturing tool.

[0066] S4, insert the flat glass 6 away from the bottom 40 into the positioning groove 10 along the side wall and close to the standard spacer, so that the two surfaces coated with the semi-transparent and semi-reflective films face each other and abut against one end of the flat glass 6 installed in step S1 to form an angle;

[0067] Specifically, the third surface 63 of the second optical flat glass 622 is placed at a 60-degree angle to the fourth surface 64 of the first optical flat glass 611 so that the third surface 63 is in close contact with the third surface 1003 of the optical wedge manufacturing tool.

[0068] S5, compacting the assembly formed in the above steps, and performing glue dispensing and curing along the plurality of glue dispensing grooves 50;

[0069] Specifically, the fourth surface 64 and the fifth surface 65 of the second optical flat glass 622 are pressed; the second surface 62 of the second optical flat glass 622 is brought into close contact with the second surface 32 of the assembly spacer 30, and the fourth surface 64 of the first optical flat glass 611 is brought into close contact with the first surface 301 of the assembly spacer 30; or the assembly spacer optical fiber 29 is brought into close contact with the second surface 62 of the second optical flat glass 622 and the fourth surface 64 of the first optical flat glass 611, respectively; and glue is dispensed and cured at the closely contacted locations of the first optical flat glass 611 and the second optical flat glass 622 at the first to ninth glue dispensing grooves 50 of the optical wedge manufacturing tool.

[0070] S6. Clean the glue that overflows from the end surface and remove the portion of the standard spacer that extends beyond the end surface;

[0071] Specifically, the optical wedge that has been glued and cured is removed; the glue overflowing from the first surface 61, third surface 63, fifth surface 65, and sixth surface 66 of the flat glass 6 (i.e., the first, third, fifth, and sixth surfaces of the optical wedge) and the portions of the assembly spacer optical fiber 29 and the assembly spacer gasket 30 that extend beyond the first surface 61, third surface 63, fifth surface 65, and sixth surface 66 of the flat glass 6 are scraped off along the end surface of the optical wedge with a knife and cleaned up. In other words, the fourth surface 304, fifth surface 305, and sixth surface 306 of the assembly spacer gasket 30 are trimmed accordingly.

[0072] The order of steps S3 and S4 can be interchanged.

[0073] In some embodiments, the standard spacer is a standard film made of an organic material or an optical fiber with a standard core diameter.

[0074] like Figure 8 、 Figure 9 and Figure 10 As shown, the optical wedge manufactured as described above is applied to an optical sensing device for measuring physical parameters, comprising:

[0075] A light source for generating a light signal having predetermined spectral characteristics; connected to the base 5 via a light source mounting block 14;

[0076] a Fabry-Perot sensor through which the optical signal passes, the Fabry-Perot sensor comprising two half-reflective mirrors substantially parallel to each other and spaced a given distance apart so as to define a Fabry-Perot cavity, the Fabry-Perot cavity having transmittance or reflectance characteristics that are affected by a physical parameter and induce a spectrum, the characteristics of the optical signal varying in response to the physical parameter, the Fabry-Perot sensor being provided with at least one optical fiber for transmitting the optical signal into the Fabry-Perot cavity and for collecting at least a portion of the optical signal output from the Fabry-Perot cavity;

[0077] Fizeau interferometry module, which includes:

[0078] A base 5, wherein a through hole is provided on one side wall of the base 5;

[0079] An optical fiber interface assembly is mounted on the through hole;

[0080] The linear array CCD includes a CCD sensor 3 and a CCD circuit board 4. The CCD sensor 3 and the CCD circuit board 4 are connected to each other, and an optical path 9 is formed between the CCD sensor 3 and the optical fiber interface assembly.

[0081] The optical wedge component is set on the optical path, such as Figure 11 As shown, the optical wedge assembly includes an optical wedge, an auxiliary spacer 302, and a positioning block 8; the optical wedge includes two pieces of flat glass 6 and a spacer 30, one end of the two pieces of flat glass 6 is abutted, in this embodiment, that is, the lower side is abutted, and the other end (in this embodiment, the upper side) is separated by the spacer 30; the inclined surface of the optical wedge is tightly attached to the auxiliary spacer 302 at the end where the spacer 30 is not provided to form the optical wedge assembly, and the optical wedge assembly is installed in the positioning block 8, and the positioning block 8 is connected to the base 5; in this embodiment, the spacer 30 and the auxiliary spacer 302 are identical and are symmetrically arranged relative to the optical axis of the optical wedge.

[0082] In this embodiment, the optical wedge is manufactured using the manufacturing method of the present invention;

[0083] like Figure 10 As shown, the CCD sensor 3 and the optical wedge are flatly connected, and the CCD circuit board 4 is mounted on the other side wall of the base 5;

[0084] The Fizeau interferometer module also includes a collimating lens and a shaping lens 2 arranged on the base. Referring to the formed optical path 9, the light transmitted by the optical fiber interface assembly passes through the collimating lens, the shaping lens 2, and the optical wedge in sequence to reach the CCD sensor 3; the shaping lens 2 is mounted on the base 5 through the lens mount 1.

[0085] At least a portion of the optical signal is connected to the Fizeau interferometer module through the optical fiber interface assembly;

[0086] passing through the optical wedge and exiting from the optical wedge a spatially expanded optical signal representing a transmittance or reflectance characteristic of the Fabry-Perot sensor;

[0087] Physical parameters can thus be determined by spatially expanding the optical signal.

[0088] Specifically, if Figure 8 As shown, the base 5 can be placed on any flat surface. The fiber optic interface assembly includes a fiber optic adapter 10, which is screwed into a through-hole on the side of the base 5 via its external threads. A fiber optic connector 11, with a main optical fiber 12 welded to its tail, is screwed into the external threads of the fiber optic adapter 10 via its internal threads until it reaches the limit. The light source mounting block 14 and CCD circuit board 4 are respectively mounted on different sides of the base 5 via screws. The cylindrical mirror mounting base 1 and positioning block 8 are also screwed to the bottom of the countersunk hole in the base 5.

[0089] like Figure 8 As shown, the main optical fiber 12 is coupled with the auxiliary optical fiber 21 connected to the light source at an intersection position, and the auxiliary optical fiber 21 is connected to the light source through the optical fiber ceramic ferrule 18.

[0090] The pressure sensing film 13 is attached to the end face of the main optical fiber 12 by glue. Figure 9 As shown, a countersunk hole is processed on the end face of the optical fiber, forming a closed chamber with the pressure sensing film 13, which is a Fabry-Perot sensor.

[0091] In this embodiment, the optical sensing device reduces the accuracy requirement for the initial cavity length of the FP sensor through overall coordination, and at the same time achieves precision adjustment of the optical wedge through spacers, so that the engineering requirements of the medical industry can be met economically and in batches.

[0092] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tool for manufacturing an optical wedge, characterized in that: The optical wedge is a transparent optical element with a wedge-shaped interface. The optical wedge comprises two pieces of flat glass. The angle between the two pieces of flat glass is less than 1 / 10 of a radian. Along the intersection of the two sides of the angle toward the open end, the distance between the wedge-shaped interfaces changes gradually and continuously, and the refractive index of the flat glass remains unchanged. The tooling comprises: a positioning groove adapted to fit the two pieces of flat glass so that the two pieces of flat glass can be positioned and inserted into the positioning groove; the positioning groove comprises a bottom and side walls, and after the two pieces of flat glass are inserted into the positioning groove, a gap of no more than a predetermined distance exists between the side walls and the flat glass, so that the flat glass can be placed into the positioning groove without shaking along its bottom beyond the predetermined distance; an open space is left at the top opposite to the bottom, so that the flat glass away from the bottom can be adapted to move a certain angle and displacement relative to the flat glass adjacent to the bottom, thereby adjusting the angle and relative position between the two pieces of flat glass; a spacer bayonet is provided on the side wall for positioning a standard spacer, and after the flat glass adjacent to the bottom is inserted into the positioning groove, the standard spacer can be tightly abutted against the upper surface of the flat glass adjacent to the bottom through the spacer bayonet, so that the gap between the two pieces of flat glass can be precisely adjusted, the upper surface being the surface facing the gap between the two pieces of flat glass; a clearance groove is provided at the bottom to avoid the effective working surface of the flat glass, so that the flat glass only contacts the bottom at the outer periphery of the edge; A plurality of glue dispensing grooves are arranged on the side wall so that the gap between the two flat glass sheets inserted into the positioning groove and separated by the standard spacers is exposed in the glue dispensing grooves.

2. The tooling according to claim 1, characterized in that: The side walls include a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are arranged opposite to each other in the width direction of the positioning groove, and the third side wall and the fourth side wall are arranged opposite to each other in the length direction of the positioning groove; along the length direction, away from the third side wall, the gap between the two pieces of flat glass installed in the positioning groove and separated by the standard spacer gradually increases.

3. The tooling according to claim 2, characterized in that: The clearance groove extends along the length direction of the positioning groove and passes through the fourth side wall. The gap of the clearance groove on the fourth side wall extends upward along the fourth side wall away from the bottom until it passes through the top of the fourth side wall.

4. The tooling according to claim 2, characterized in that: A first section is provided on a side of the first side wall and the second side wall close to the fourth side wall, and the first section is parallel to the fourth side wall and staggered by the same preset distance in the longitudinal direction; After the flat glass adjacent to the bottom is installed in the positioning groove, the end surface of the fourth side wall away from the bottom is not higher than the upper surface of the flat glass adjacent to the bottom, and the connection end between the first section and the fourth side wall is not higher than the upper surface of the flat glass adjacent to the bottom; The first section and the end surface of the fourth side wall away from the bottom constitute the spacer snap fit. The standard spacer is a spacer gasket having at least one flat end surface. The standard spacer can make the flat end surface close to the first section through the spacer snap fit.

5. The tooling according to claim 2, characterized in that: The first side wall and the second side wall are symmetrically provided with optical fiber card slots, and the optical fiber card slots are staggered with the third side wall by the same preset distance in the length direction; the standard spacer is an optical fiber with a standard core diameter.

6. The tooling according to claim 2, characterized in that: The first side wall and the second side wall are both provided with a second section on one side close to the third side wall. The second section and the third side wall are staggered by a preset distance in the length direction; the glue dispensing groove is provided between the second section and the third side wall.

7. The tooling according to claim 6, characterized in that: The third side wall is provided with a dispensing groove, and the first side wall and the second side wall are symmetrically provided with a plurality of dispensing grooves.

8. The tooling according to any one of claims 1 to 7, characterized in that: The tooling also includes a pressing block connected to the side wall via a rotating shaft. The pressing block is used to press the combination of the two flat glass pieces and the standard spacer installed in the positioning groove during glue dispensing.

9. A method for manufacturing an optical wedge, characterized in that: Using the tool according to any one of claims 1 to 8, the steps include: S1. Prepare two pieces of flat glass of the same material, both made of optical glass transparent material, one side of the flat glass is coated with an antireflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio; S2. Place the flat glass adjacent to the bottom into the positioning groove along the side wall so that the side of the flat glass coated with the antireflection film is close to the bottom and the side coated with the semi-transparent and semi-reflective film faces upward; S3. Place a standard spacer into the spacer mount so that the standard spacer is in close contact with the upper surface of the flat glass adjacent to the bottom, where the upper surface is coated with a semi-transparent and semi-reflective film; S4, placing the flat glass away from the bottom into the positioning groove along the side wall and close to the standard spacer, so that the two surfaces coated with the semi-transparent and semi-reflective films face each other and abut against the flat glass placed in step S1 at one end to form an angle; S5, compacting the assembly formed in the above steps, and performing glue dispensing and curing along a plurality of glue dispensing grooves; S6. Clean the glue that overflows from the end surface and remove the portion of the standard spacer that extends beyond the end surface; The order of steps S3 and S4 can be interchanged.

10. The method for manufacturing an optical wedge according to claim 9, wherein: The standard spacer is a standard film made of organic material or an optical fiber with a standard core diameter.

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