Tool for manufacturing optical wedge and manufacturing method of optical wedge

Abstract

The invention discloses a tool for manufacturing an optical wedge and a manufacturing method of the optical wedge, the optical wedge comprises two pieces of plate glass with an included angle, the tool comprises a positioning groove, and the positioning groove is matched with the two pieces of plate glass so that the two pieces of plate glass can be positioned and installed in the positioning groove; the spacer bayonet is used for positioning a standard spacer; a plurality of dispensing grooves are formed, so that a gap between the two pieces of flat glass which are arranged in the positioning groove and are separated by the standard spacer is exposed in the dispensing grooves. A method different from the prior art is adopted to manufacture the optical wedge, after the two pieces of plate glass are positioned through the tool, the gap between the two pieces of plate glass is adjusted through the standard distance piece, the precision of the manufactured optical wedge is adjusted and controlled through the precision of the standard distance piece, cost is low, and batch manufacturing is easy; the precision of the optical wedge manufactured by using the tool and the method can meet the requirement of demodulating an optical fiber F-P sensor of which the initial cavity length cannot be accurately controlled based on a Fizeau interferometer.

Description

Technical Field

[0001] The 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 an optical wedge. Background Art

[0002] Normal intracranial pressure in the human body is 0.9-2.0 kPa. Various neurological diseases can cause increased intracranial pressure. Therefore, monitoring intracranial pressure is of great significance in the clinical treatment of various neurological diseases such as intracranial injury, cerebrovascular disease, and meningitis. Intraventricular catheters and dura mater bolts are often used to detect intracranial pressure in clinical practice, but these methods have the disadvantages of difficult puncture, only reflecting local pressure, and easy infection. In recent years, minimally invasive treatment methods using sensor systems have become another important method for monitoring intracranial pressure. Compared with electrical sensors, fiber optic sensors have the characteristics of electromagnetic compatibility, small size, high sensitivity, and high resolution, and have attracted much attention. Compared with electrical sensors, fiber optic sensors have the characteristics of electromagnetic compatibility, small size, high sensitivity, and high resolution, and have attracted much attention. Fiber Fabry-Perot sensors are currently the longest-standing, most mature, and most widely used fiber optic sensors. It creates two high-reflection layers in the optical fiber to form a microcavity. When a coherent light beam is incident on the microcavity along the optical fiber, the two high-reflection layers reflect a part of the light and return along the original path and meet each other to 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, the cavity length demodulation of the interference output signal can be performed to realize the sensing of various external parameters.

[0003] In recent years, various fiber 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; (4) a demodulation system capable of monitoring small pressure changes. Under the action of intracranial pressure, the variation range of the microcavity length in the fiber Fabry-Perot sensor corresponds to the variation of intracranial pressure. Due to the variation characteristics of intracranial pressure, the microcavity length of the fiber 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 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 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. The intensity demodulation method is simple but the result has a large error. The phase demodulation method is accurate but relatively precise, and has become a more common method at present. Commonly used phase demodulation methods include fringe counting method, Fourier transform method, and correlation method. Among them, the fringe counting method and the Fourier transform method rely on demodulation hardware, such as a high-precision spectrometer or a scanning light source, but the spectrometer is bulky, expensive, slow to acquire data, and the supporting demodulation algorithm is quite complex and time-consuming. Therefore, this method is not suitable for actual engineering, and is even less suitable for intracranial pressure detection with high requirements for real-time detection. Relatively speaking, the correlation method is more suitable for actual engineering applications because it implements correlation operations based on optical elements.

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

[0006] Optical wedge processing methods generally use parallel light glue pad method, high-precision wedge glass fixture replication method, wedge metal fixture method, single wedge angle modification and placement method and other process methods to grind optical wedges. Among these methods, only the high-precision wedge glass fixture method can batch produce small-sized, small-angle, second-level precision wedge angle optical wedge parts. The processing principle of this process is that when the part is combined with the high-precision wedge glass fixture, the finished wedge angle of the part and the wedge angle of the wedge glass fixture are used for processing. After the part is photo-bonded with the wedge glass fixture, the excess part is ground off so that the part reaches the required wedge angle. The premise for the implementation of this process method is that there must be a wedge glass fixture with higher wedge angle accuracy first, but the higher-precision wedge glass fixture itself has higher processing technical indicators, greater processing difficulty, longer production cycle, lower processing efficiency and yield rate, high production cost and is not suitable for the medical field where the number of single parts required is small.

[0007] Therefore, when demodulating the optical fiber FP sensor whose initial cavity length cannot be precisely controlled based on the Fizeau interferometer, there is an urgent need for a glass wedge manufacturing tooling and manufacturing method that can more economically meet the needs of 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 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, and along the direction from the intersection of the two sides of the angle to 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 tool comprises:

[0010] A positioning groove, wherein the positioning groove and the two pieces of flat glass are adapted to allow the two pieces of flat glass to be positioned and loaded into the positioning groove; the positioning groove comprises a bottom and a side wall, and after the two pieces of flat glass are loaded into the positioning groove, there is a gap of no more than a predetermined distance between the side wall and the flat glass, so that the flat glass can be put 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 is suitable for moving a certain angle and displacement relative to the flat glass adjacent to the bottom, and is suitable for adjusting the angle and relative position between the two pieces of flat glass; a spacer bayonet is arranged on the side wall, and is used to position a standard spacer, and after the flat glass adjacent to the bottom is loaded into the positioning groove, the standard spacer can be closely attached to 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 accurately adjusted, and the upper surface is a surface facing the gap between the two pieces of flat glass; a clearance groove is arranged at the bottom, so that the effective working surface of the flat glass is avoided, so that the flat glass contacts the bottom only 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 spacer is exposed in the glue dispensing groove.

[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; and the gap between the two pieces of flat glass inserted into the positioning groove and separated by the standard spacer gradually increases along the length direction away from the third side wall.

[0013] Preferably, the clearance groove extends along the length direction of the positioning groove and passes through the fourth side wall, and the notch 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. The beneficial effect is that the positioning groove is easy to process.

[0014] Preferably, the first side wall and the second side wall are both provided with a first section on one 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 length 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 face of the fourth side wall away from the bottom constitute the spacer bayonet, the standard spacer is a spacer with at least one flat end face, and the standard spacer can make the flat end face close to the first section through the spacer bayonet. The beneficial effect is that the gap between the two flat glasses can be accurately adjusted by using the thickness of the spacer and the preset offset distance.

[0017] Preferably, the first side wall and the second side wall are symmetrically provided with optical fiber slots, and the optical fiber 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. The beneficial effect is that the gap between the two flat glass sheets can be precisely adjusted by utilizing the size of the optical fiber core diameter and the preset staggered distance.

[0018] Preferably, 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, and 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. The beneficial effect is that the second section and the third side wall are staggered by a preset distance in the length direction, which is conducive to leaving space for processing the arc segment of the third side wall, and the processing is convenient.

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

[0020] Preferably, the tooling further comprises a pressing block, wherein the pressing block is connected to the side wall via a rotating shaft, and the pressing block is used to press the combination of the two flat glass pieces and the standard spacer loaded into the positioning groove during glue 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 anti-reflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio;

[0023] S2, placing 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 anti-reflection film is close to the bottom and the side coated with the semi-transparent and semi-reflective film faces upward;

[0024] S3, placing a standard spacer into the spacer bayonet, so that the standard spacer is in close contact with the upper surface of the flat glass adjacent to the bottom, the upper surface being the surface 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 one end of the flat glass placed in step S1 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 overflowing from the end surface and remove the part of the standard spacer that exceeds 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 organic material or an optical fiber with a standard core diameter.

[0030] Compared with the prior art, the present invention has the following beneficial effects: an optical wedge is manufactured by a method different from the prior art, two pieces of flat glass are positioned by a tooling, the gap between the two pieces of flat glass is adjusted by a standard spacer, and the precision of the manufactured optical wedge is regulated by the precision of the standard spacer, so the cost is low and batch production is easy; the precision of the optical wedge manufactured by the tooling and the method can meet the needs of the optical fiber FP sensor based on Fizeau interferometer demodulation whose 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 assembling an optical wedge according to an embodiment of the present invention.

[0033] Figure 2 Schematic diagram of a tool 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 It is a 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 It is a schematic diagram of the tooling, flat glass and standard spacers used in one embodiment of the present invention.

[0038] Figure 7 It is another schematic diagram of the tooling, flat glass and standard spacer 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] Fig. 9 for Figure 8 Schematic diagram of the FP sensor enlarged on the left in the BB direction schematic diagram in FIG.

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

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

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

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0045] In the present invention, the optical fiber FP sensor, the optical fiber Fabry-Perot sensor and the 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, reference Fig.12 The optical wedge comprises two pieces of flat glass 6, one end of the two pieces of flat glass 6 is abutted, and the other end is sandwiched with a spacer 30, the angle between the two pieces of flat glass is less than 1 / 10 of a radian, and along the intersection of the two sides of the angle toward the open end, the distance between the wedge-shaped interfaces gradually changes continuously and the refractive index of the flat glass remains unchanged, and the tooling comprises:

[0047] The positioning groove 10 is adapted to 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 direction of the flat glass 6 and the cross section of the positioning groove perpendicular to the depth direction of the positioning groove 10 are adapted, and the height of the wedge-shaped ends formed by the two pieces of flat glass 6 is lower than the side wall portion abutting against them. The positioning groove 10 includes a bottom 40 and a side wall. After the two pieces of flat glass 6 are installed in the positioning groove 10, there is a gap of no more than a predetermined distance between the side wall and the flat glass 6, so that the flat glass 6 can be placed in 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, and is adapted to adjust 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 closely 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 tightly, and 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 disposed 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, Figure 1 and Figure 2 As shown, the side wall includes 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 arranged 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 arranged opposite to each other in the length direction of the positioning groove 10; along the length direction, away from the third side wall 103, the gap between the two flat glasses 6 installed in the positioning groove 10 and separated by the standard spacer gradually increases. In some embodiments, as 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 is in contact with the third side wall 103, 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 a cross section of a partial arc or partial ellipse that is truncated horizontally or vertically.

[0051] In some embodiments, 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, Figure 1 and Figure 2 As shown, the first side wall 101 and the second side wall 102 are both provided with a first section 110 on one side close to the fourth side wall 104, and 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 not 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 not 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 snap fit. The standard spacer is a spacer gasket 30 having at least one flat end surface. The standard spacer can make the flat end surface close to the first section 110 through the spacer snap fit. Figure 1 As shown, correspondingly, 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, Figure 1 and Figure 2 As shown, the first side wall 101 and the second side wall 102 are symmetrically provided with the optical fiber 29 slots 60, and the optical fiber 29 slots 60 are staggered with the third side wall 103 by the same preset distance in the length direction; the standard spacer is an optical fiber 29 with a standard core diameter. The size of the core diameter of the optical fiber 29 and the preset staggered distance L1 are used to achieve precise adjustment of the gap and wedge angle between the two flat glasses 6.

[0056] In some embodiments, 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, and the second section 120 and the third side wall 103 are staggered by a preset distance in the length direction; a dispensing groove 50 is provided between the second section 120 and the third side wall 103, as shown in FIG. Figure 1 and Figure 3 The fourth glue dispensing groove 504 and the sixth glue dispensing groove 506 are shown. The second section 120 and the third side wall 103 are staggered by a preset distance in the length direction, which is conducive to leaving space for processing the arc section 90 of the third side wall 103, and the processing is convenient.

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

[0058] In some embodiments, Figure 4 and Figure 5 As shown, the tooling also includes a pressing block, which is connected to the side wall through a rotating shaft. The pressing block is used to press the combination of the two flat glasses 6 and the standard spacer installed in the positioning groove 10 when dispensing glue. Specifically, the rotating shaft 39 passes through the through holes of the tooling 36 and the pressing block 37, and glue is dispensed from the hole on the pressing block 37 to fix the pressing block shaft 39 and the pressing block 37, so that the pressing block shaft 39 and the pressing block 37 can swing around the through hole of the tooling 36 when the tooling 36 is fixed. One end of the torsion spring 38 penetrates the through hole of the rotating shaft 39, and the other end penetrates the through hole of the tooling 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, such as Figure 6 and Figure 7As shown, an optical flat glass 6 with a better 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, 80 / 20, and a film made of an organic material with controllable precision thickness (such as PDMS organic film, polyimide film, etc.) or an optical fiber 29 with a standard core diameter; the two flat glasses 6 are respectively 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 anti-reflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio;

[0062] S2, insert 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 surface 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 tooling, facing the fourth surface 1004 of the tooling, 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 tooling, 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 tooling; 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 tooling.

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

[0065] Specifically, the assembly spacer 30 is placed parallel to 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 is in close contact with the seventh surface 1007 and the eighth surface 1008 of the optical wedge manufacturing tool; or 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 along a direction of 60 degrees with the fourth surface 64 of the first optical flat glass 611, so that the third surface 63 is close to 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 closely attached to the second surface 32 of the assembly spacer 30, and the fourth surface 64 of the first optical flat glass 611 is closely attached to the first surface 301 of the assembly spacer 30; or the assembly spacer optical fiber 29 is closely attached to 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 the first to ninth glue dispensing grooves 50 of the optical wedge manufacturing tool are respectively glued and cured at the closely attached positions of the first optical flat glass 611 and the second optical flat glass 622;

[0070] S6. Clean the glue overflowing from the end surface and remove the part of the standard spacer that exceeds the end surface;

[0071] Specifically, take out the glue-cured optical wedge; use a knife to scrape off the glue overflowing from the first surface 61, the third surface 63, the fifth surface 65, and the sixth surface 66 of the flat glass 6 (i.e., the first, third, fifth, and sixth surfaces of the optical wedge) and the parts of the assembly spacer optical fiber 29 and the assembly spacer gasket 30 that exceed the first surface 61, the third surface 63, the fifth surface 65, and the sixth surface 66 of the flat glass 6 along the end surface of the optical wedge and clean them up, that is, the fourth surface 304, the fifth surface 305, and the 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 , Fig. 9 and Fig.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, used to generate a light signal with a predetermined spectral characteristic; 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 semi-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 a transmittance or reflectance property that is affected by a physical parameter and causes a spectrum, the property of the optical signal changing 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 interferometer 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 installed 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 in circuit, and an optical path 9 is formed between the CCD sensor 3 and the optical fiber interface component;

[0081] The optical wedge assembly is arranged on the optical path, such as Fig.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 are abutted, in this embodiment, that is, the lower side is abutted, and the other end (in this embodiment, that is, 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 an 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 the same, and are symmetrically arranged relative to the optical axis of the optical wedge.

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

[0083] like Fig.10 As shown, the CCD sensor 3 and the optical wedge are flatly connected, and the CCD circuit board 4 is installed 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 mounting seat 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 a 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 is placed on any plane, and the optical fiber interface assembly includes an optical fiber adapter 10, which is screwed into the through hole on the side of the base 5 through its own external thread, and the optical fiber connector 11 with the main optical fiber 12 welded at the tail is screwed into the external thread of the optical fiber adapter 10 through its own internal thread to the limit position. The light source mounting block 14 and the CCD circuit board 4 are respectively mounted on different sides of the base 5 by screws, and the cylindrical mirror mounting seat 1 and the positioning block 8 are respectively mounted on the bottom of the countersunk hole of the base 5 by screws.

[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 intersecting 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. Fig. 9 As shown, a countersunk hole is processed on the end face of the optical fiber to form a closed chamber with the pressure sensing film 13, that 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, the accuracy adjustment of the optical wedge is achieved through the spacer, 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 description is only a preferred embodiment of the present invention and is 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 can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 includes 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 includes: A positioning groove, wherein the positioning groove and the two pieces of flat glass are adapted to allow the two pieces of flat glass to be positioned and loaded into the positioning groove; the positioning groove comprises a bottom and a side wall, and after the two pieces of flat glass are loaded into the positioning groove, there is a gap of no more than a predetermined distance between the side wall and the flat glass, so that the flat glass can be put 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 is suitable for moving a certain angle and displacement relative to the flat glass adjacent to the bottom, and is suitable for adjusting the angle and relative position between the two pieces of flat glass; a spacer bayonet is arranged on the side wall, and is used to position a standard spacer, and after the flat glass adjacent to the bottom is loaded into the positioning groove, the standard spacer can be closely attached to 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 accurately adjusted, and the upper surface is a surface facing the gap between the two pieces of flat glass; a clearance groove is arranged at the bottom, so that the effective working surface of the flat glass is avoided, so that the flat glass contacts the bottom only 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 spacer is exposed in the glue dispensing groove.

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 inserted into the positioning groove and separated by the standard spacer gradually increases.

3. The tooling according to claim 2, characterized in that: The giving way groove extends along the length direction of the positioning groove and passes through the fourth side wall. The notch of the giving way groove located on the fourth side wall extends upward along the fourth side wall away from the bottom until passing through the top end of the fourth side wall.

4. The tooling according to claim 2, characterized in that: A first section is provided on one 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 length 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, and 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 slots, and the optical fiber 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, and 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, which is connected to the side wall via a rotating shaft and 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 tooling 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 anti-reflection film, and the other side is coated with a semi-transparent and semi-reflective film with a certain transmission-reflection ratio; S2, placing 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 anti-reflection film is close to the bottom and the side coated with the semi-transparent and semi-reflective film faces upward; S3, placing a standard spacer into the spacer bayonet, so that the standard spacer is in close contact with the upper surface of the flat glass adjacent to the bottom, the upper surface being the surface 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 one end of the flat glass placed in step S1 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 overflowing from the end surface and remove the part of the standard spacer that exceeds 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, characterized in that: The standard spacer is a standard film made of organic material or an optical fiber with a standard core diameter.

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