Portable optical fiber spectrometer mechanical structure

Abstract

The invention provides a mechanical structure of a portable optical fiber spectrometer. The mechanical structure is divided into a light path layer, a circuit layer and a shell. The optical path layer is composed of six parts, namely an optical fiber base, a slit assembly, a collimating mirror assembly, a grating assembly, an imaging mirror assembly and a detector assembly in sequence in the light incidence direction. The circuit layer is composed of four cylindrical shock insulators, bolts and a circuit board, and the shock insulators and the bolts ensure that the circuit board can be horizontally fixed on the shell and cannot be interfered by the shell; the light path layer and the circuit layer are separated by the housing and are connected through a flat cable, thereby preventing the thermal radiation of the circuit layer from affecting the optical performance. The mechanical size of the whole structure is 150mm in length, 130mm in width and 90mm in height. The portable optical fiber spectrometer mechanical structure has the advantages of being small in size, light in weight, convenient to carry and check detection results and capable of preventing external interference and internal mutual interference.

Description

Technical Field

[0001] This invention relates to the field of mechanical design technology, and in particular to a mechanical structure for a portable fiber optic spectrometer. Background Technology

[0002] A spectrometer is a fundamental optical analytical instrument designed based on the principle of spectral dispersion, playing a crucial role in optical detection. By measuring the optical properties of substances, a spectrometer can analyze their composition and structure. From Newton's discovery of solar dispersion—the foundation of spectroscopy—to Koschhof's design of the first spectrometer, and to today's diverse and widely used spectrometer market, the principles of spectral analysis and hardware design have made significant progress. The functions of spectrometers have become increasingly sophisticated, and their stability has steadily improved. Due to their advantages such as high measurement accuracy, wide range, high speed, and ease of use, spectrometers are widely used in industrial production, LED testing, food testing, astronomy, biology, and other fields. In recent years, the application demands for spectrometers have been continuously increasing, making the miniaturization of spectrometers a popular research direction.

[0003] Traditional spectrometers, due to their high cost and large size, are mainly used in research institutes and universities where cost is not a major concern. In recent years, the continuous development of fields such as industrial monitoring, hydrological surveys, military reconnaissance, biomedicine, and space exploration has placed demands on spectrometers for miniaturization and portability, while also imposing stricter requirements on reliability and stability in harsh environments. With the increasing application demands for spectrometers, various fields are placing higher requirements on their performance, including high resolution, stability, and anti-interference capabilities. In the overall performance of a spectrometer, the mechanical structure plays a crucial supporting and ensuring role. It not only directly affects the installation accuracy and relative position stability of various components in the optical system, but also relates to the overall shock resistance, thermal stability, and long-term reliability of the instrument.

[0004] Traditional spectrometers suffer from complex and costly slit manufacturing processes, hindering their widespread application. Furthermore, the heat radiation generated by the circuitry during operation degrades the performance of the optical components. Currently, most portable fiber optic spectrometers on the market can only transmit spectral data to a host computer for analysis and result display, limiting their portability. Portable spectrometers require robust mechanical structures that are lightweight, possess sufficient strength, and prevent interference with the circuitry. To address these issues, this invention designs a mechanical structure for a portable fiber optic spectrometer. Summary of the Invention

[0005] This invention provides a portable fiber optic spectrometer mechanical structure, comprising an optical path layer, a circuit layer, and a housing. The optical path layer consists of six parts, arranged sequentially along the light incident direction: an optical fiber base, a slit assembly, a collimating lens assembly, a grating assembly, an imaging mirror assembly, and a detector assembly. The circuit layer consists of four cylindrical spacers, bolts, and a circuit board. The spacers and bolts ensure that the circuit board can be horizontally fixed to the housing without interference from the housing. The optical path layer and the circuit layer are separated by the housing and connected by a ribbon cable to prevent heat radiation from the circuit layer from affecting the optical performance. The overall mechanical dimensions are 150mm (length) × 130mm (width) × 90mm (height). This portable fiber optic spectrometer mechanical structure offers advantages such as small size, lightweight, portability, ease of viewing test results, and prevention of external interference and interference between different layers.

[0006] This invention provides a portable fiber optic spectrometer mechanical structure, comprising an optical path layer, a circuit layer, and a housing. The optical path layer is characterized by being composed of an optical fiber base, a slit assembly, a collimating lens assembly, a grating assembly, an imaging mirror assembly, and a detector assembly arranged sequentially along the light incident direction. All of these components are fixed to the housing with bolts. The slit assembly is made of 6061 aluminum alloy, with a slit groove diameter of 23.5 mm < 24.5 mm and a slit groove depth of 0.4 mm < 0.6 mm. The slit is a metal sheet slit, and its angle can be adjusted by rotation within the slit groove. The slit is adhered to the slit groove with optical adhesive. The slit assembly is pressed onto the optical fiber base and fixed to the housing with four bolts to prevent stray light reflection from the optical fiber base. The bolt hole diameter is 3.0 mm < 4.0 mm. The grating assembly is made of 6061 aluminum alloy. The grating is fixed by two grating blocks, each secured to the assembly with two bolts. Before fixing, the grating can move freely left and right for easy replacement. The dimensions are: 24.5mm < grating groove length < 25.5mm, 3.5mm < grating groove depth < 4.5mm. The grating assembly has three bolt holes at the bottom, with a diameter of 3.0mm < bolt hole diameter < 4.0mm. The detector assembly is also made of 6061 aluminum alloy. Two copper pillars are fixed to the detector assembly via two bolt holes. The detector is secured to the copper pillars with two bolts. The copper pillars provide sufficient space for the detector connection cable, preventing excessive bending. The detector assembly also has three bolt holes at the bottom, with a diameter of 3.0mm < bolt hole diameter < 4.0mm.

[0007] Optionally, the collimating lens assembly is made of 6061 aluminum alloy, with a collimating lens groove diameter of 21.5mm and a collimating lens groove depth of 3.5mm and a collimating lens groove depth of 4.5mm. The collimating lens assembly has three bolt holes at the bottom, with a bolt hole diameter of 3.0mm and a collimating lens glued to the collimating lens groove.

[0008] Optionally, the imaging mirror assembly is made of 6061 aluminum alloy, with a mirror groove diameter of 52.5mm < 53.5mm and a mirror groove depth of 3.5mm < 4.5mm. The bottom of the imaging mirror assembly has three bolt holes with a diameter of 3.0mm < 4.0mm. The imaging mirror is attached to the mirror groove with optical adhesive.

[0009] Optionally, the housing is made of 6061 aluminum alloy. The housing includes cable routing vias, fiber optic base bolt holes, vias required for the circuit board, and bolt holes for the display screen. The fiber optic base bolt holes, vias required for the circuit board, and bolt holes for the display screen are all on the same side of the housing. The cable routing vias are elongated oval holes with a length of 22.5mm < cable routing via length < 23.5mm and semicircles with a radius of 1.5mm at both ends. The vias required for the circuit board include power vias and data transmission vias with a length of 13.5mm < power via length < 14.5mm, a width of 11.5mm < power via width < 12.5mm, a length of 9.5mm < data transmission via length < 10.5mm, and a width of 5.5mm < data transmission via width < 6.5mm.

[0010] Optionally, the circuit layer is characterized in that: the circuit board is fixed to the housing by four spacers and bolts, the display screen is fixed to the housing by four bolt holes, the display screen is an OLED screen, 21.5mm < display screen length < 22.5mm, 21.5mm < display screen width < 22.5mm, and the display screen is used to display the spectral detection results.

[0011] Optionally, the mechanical dimensions of the optical path layer are 150mm long × 130mm wide × 60mm high; the mechanical dimensions of the circuit layer are 150mm long × 130mm wide × 24mm high; and the mechanical dimensions of the overall structure are 150mm long × 130mm wide × 90mm high.

[0012] As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages: The portable fiber optic spectrometer's mechanical structure utilizes a metal slit, reducing costs. The outer shell separates the optical path layer from the circuit layer, preventing thermal radiation from the circuitry from affecting optical performance. Spacers separate the circuit board from the outer shell, ensuring the board is horizontally fixed while preventing interference from the shell. The display screen shows test results in real time without needing to transmit them to a host computer, improving the spectrometer's portability. The overall structure is small, lightweight, and easy to carry. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the optical path layer structure of the portable fiber optic spectrometer of the present invention. Figure 2 This is a schematic diagram of the slit assembly structure of the portable fiber optic spectrometer of the present invention. Figure 3 This is a schematic diagram of the collimating lens assembly structure of the portable fiber optic spectrometer of the present invention; Figure 4 This is a schematic diagram of the grating assembly structure of the portable fiber optic spectrometer of the present invention. Figure 5 This is a schematic diagram of the imaging mirror assembly structure of the portable fiber optic spectrometer of the present invention. Figure 6 This is a schematic diagram of the detector assembly structure of the portable fiber optic spectrometer of the present invention. Figure 7 This is a side view of the outer casing of the portable fiber optic spectrometer of the present invention. Reference numerals: 1-Fiber optic base; 2-Slit assembly; 3-Collimating lens assembly; 4-Grating assembly; 5-Imaging mirror assembly; 6-Detector assembly; 7-Cable via; 8-Display screen; 9-Housing; 10-Slit groove; 11-Bolt hole; 12-Collimating lens groove; 13-Grating groove; 14-Grating clamp bolt hole; 15-Imaging mirror groove; 16-Copper pillar bolt hole; 17-Power via; 18-Data transmission via; 19-Ground foot. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0015] Please refer to Figure 1 This is a schematic diagram of the optical path layer structure of the portable fiber optic spectrometer of the present invention. The mechanical structure of the portable fiber optic spectrometer is divided into an optical path layer, a circuit layer and a shell 9. The optical path layer is characterized by being composed of an optical fiber base 1, a slit assembly 2, a collimating lens assembly 3, a grating assembly 4, an imaging mirror assembly 5 and a detector assembly 6 arranged sequentially along the incident direction of light. The optical fiber base 1, the slit assembly 2, the collimating lens assembly 3, the grating assembly 4, the imaging mirror assembly 5 and the detector assembly 6 are all fixed to the shell 9 by bolts.

[0016] Please refer to Figure 2The diagram shows the slit assembly structure of the portable fiber optic spectrometer of the present invention. The slit assembly 2 is made of 6061 aluminum alloy, with a diameter of 23.5 mm < slit groove 10 diameter < 24.5 mm, a slit groove depth of 0.4 mm < slit groove 10 depth < 0.6 mm, and the slit is glued to the slit groove 10 with optical adhesive. The slit assembly 2 is pressed onto the fiber optic base 1 and fixed to the outer shell 9 through four bolt holes 11, which can block stray light reflected by the fiber optic base 1. The diameter of the bolt holes 11 is 3.0 mm < 4.0 mm.

[0017] Please refer to Figure 3 The diagram shows the structure of the collimating lens assembly 3 of the portable fiber optic spectrometer of the present invention. The collimating lens assembly 3 is made of 6061 aluminum alloy, with a diameter of 21.5mm < mirror groove 12 diameter < 22.5mm and a depth of 3.5mm < mirror groove 12 depth < 4.5mm. The bottom of the collimating lens assembly 3 has three bolt holes 11, with a diameter of 3.0mm < bolt hole 11 diameter < 4.0mm. The collimating lens is attached to the mirror groove 12 with optical adhesive.

[0018] Please refer to Figure 4 The diagram shows the structure of the grating assembly 4 of the portable fiber optic spectrometer of the present invention. The grating assembly 4 is made of 6061 aluminum alloy. The grating assembly 4 is fixed by two grating blocks, one above the other. Each grating block is fixed to the grating assembly 4 by two bolt holes 14. The grating can move freely left and right. The length of the grating groove 13 is 24.5mm < 25.5mm, and the depth of the grating groove 13 is 3.5mm < 4.5mm. There are three bolt holes 11 at the bottom of the grating assembly 4. The diameter of the bolt holes 11 is 3.0mm < 4.0mm.

[0019] Please refer to Figure 5 The diagram shows the structure of the imaging mirror assembly 5 of the portable fiber optic spectrometer of the present invention. The imaging mirror assembly 5 is made of 6061 aluminum alloy, with a diameter of 52.5 mm < mirror groove 15 diameter < 53.5 mm and a depth of 3.5 mm < mirror groove 15 depth < 4.5 mm. The bottom of the imaging mirror assembly 5 has three bolt holes 11, with a diameter of 3.0 mm < bolt hole 11 diameter < 4.0 mm. The imaging mirror is attached to the mirror groove 15 with optical adhesive.

[0020] Please refer to Figure 6 The diagram shows the structure of the detector assembly 6 of the portable fiber optic spectrometer of the present invention. The detector assembly 6 is made of 6061 aluminum alloy. The detector assembly 6 is fixed to two copper pillars through two bolt holes 16. The detector is fixed to the copper pillars by two bolts. There are three bolt holes 11 at the bottom of the detector assembly 6, with a diameter of 3.0 mm < bolt hole 11 < 4.0 mm.

[0021] Please refer to Figure 7The image shows a side view of the outer casing 9 of the portable fiber optic spectrometer of the present invention. The casing 9 is made of 6061 aluminum alloy. The casing 9 includes a ribbon cable via 7, fiber optic base bolt holes, vias required for the circuit board, and bolt holes for the display screen. The fiber optic base bolt holes, vias required for the circuit board, and bolt holes for the display screen are all on the same side of the casing 9. The ribbon cable via 7 is an elongated oval hole with a length of 22.5 mm < length < 23.5 mm and semicircles with a radius of 1.5 mm at both ends. The vias required for the circuit board include a power supply via 17 and a data transmission via 18 with a length of 13.5 mm < length < 14.5 mm, a width of 11.5 mm < width < 12.5 mm, a length of 9.5 mm < length < 10.5 mm, and a width of 5.5 mm < width < 6.5 mm.

[0022] The mechanical structure of a portable fiber optic spectrometer described in this invention comprises an optical path layer, a circuit layer, and a housing. The optical path layer consists of six parts, arranged sequentially along the light incident direction: an optical fiber base, a slit assembly, a collimating lens assembly, a grating assembly, an imaging mirror assembly, and a detector assembly. The circuit layer consists of four cylindrical spacers, bolts, and a circuit board. The spacers and bolts ensure that the circuit board can be horizontally fixed to the housing without interference from the housing. The optical path layer and the circuit layer are separated by the housing and connected by a ribbon cable to avoid the influence of heat radiation from the circuit layer on the optical performance. The overall mechanical dimensions are 150mm (length) × 130mm (width) × 90mm (height). The portable fiber optic spectrometer mechanical structure of this invention has the advantages of small size, lightweight, easy portability and viewing of test results, and prevention of external interference and internal mutual interference.

[0023] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A portable fiber optic spectrometer mechanical structure, comprising an optical path layer, a circuit layer and a shell, wherein the optical path layer is characterized by being composed of an optical fiber base (1), a slit assembly (2), a collimating lens assembly (3), a grating assembly (4), an imaging mirror assembly (5) and a detector assembly (6) arranged sequentially along the incident direction of light, and all of the above-mentioned components are fixed to the shell (9) by bolts. The slit assembly (2) is made of 6061 aluminum alloy, with a slit groove diameter of 23.5mm < 24.5mm and a slit groove depth of 0.4mm < 0.6mm. The slit is a metal sheet slit, which can be adjusted by rotation within the slit groove. The slit is glued to the slit groove (10) with optical adhesive. The slit assembly (2) is pressed onto the fiber optic base (1) and fixed to the outer shell (9) with four bolts to prevent the fiber optic base from reflecting stray light. The bolt hole diameter (11) is 3.0mm < 4.0mm. The grating assembly (4) is made of 6061 aluminum alloy. The grating assembly (4) is fixed by two grating blocks, and each grating block is fixed to the grating assembly (4) by two bolts. Before the grating is fixed, it can move freely left and right to facilitate grating replacement. 24.5mm < grating groove (13) length < 25.5mm, 3.5mm < grating groove (13) depth < 4.5mm. There are three bolt holes (11) at the bottom of the grating assembly (4). 3.0mm < bolt hole (11) diameter < 4.0mm. The detector assembly (6) is made of 6061 aluminum alloy. The detector assembly (6) is fixed to two copper pillars through two copper pillar bolt holes (16). The detector is fixed to the copper pillars by two bolts. The copper pillars provide enough space for the detector connection line to prevent the connection line from bending excessively. There are three bolt holes (11) at the bottom of the detector assembly (6). The diameter of the bolt hole (11) is 3.0mm < 4.0mm.

2. The mechanical structure of a portable fiber optic spectrometer as described in claim 1, wherein the optical path layer is characterized in that: the collimating lens assembly (3) is made of 6061 aluminum alloy, 21.5mm < diameter of collimating lens groove (12) < 22.5mm, 3.5mm < depth of collimating lens groove (12) < 4.5mm, the bottom of the collimating lens assembly (3) has three bolt holes (11), 3.0mm < diameter of bolt holes (11) < 4.0mm, and the collimating lens is glued to the collimating lens groove (12) by optical adhesive.

3. The mechanical structure of a portable fiber optic spectrometer as described in claim 1, wherein the optical path layer is characterized in that: the imaging mirror assembly (5) is made of 6061 aluminum alloy, 52.5mm < diameter of the imaging mirror groove (15) < 53.5mm, 3.5mm < depth of the imaging mirror groove (15) < 4.5mm, the bottom of the imaging mirror assembly (5) has three bolt holes (11), 3.0mm < diameter of the bolt holes (11) < 4.0mm, and the imaging mirror is glued to the imaging mirror groove (15) by optical adhesive.

4. The mechanical structure of a portable fiber optic spectrometer as described in claim 1, characterized in that: the material of the outer shell (9) is 6061 aluminum alloy, the outer shell (9) includes a ribbon cable via (7), a fiber optic base bolt hole, a via required for the circuit board and a bolt hole for the display screen, wherein the bolt hole for the fiber optic base, the via required for the circuit board and the bolt hole for the display screen are all on the same side of the outer shell (9), the ribbon cable via (7) is an elongated hole, 22.5mm < the length of the ribbon cable via (7) < 23.5mm, and both ends are semicircles with a radius of 1.5mm, the via required for the circuit board includes a power via (17) and a data transmission via (18), 13.5mm < the length of the power via (17) < 14.5mm, 11.5mm < the width of the power via (17) < 12.5mm, 9.5mm < the length of the data transmission via (18) < 10.5mm, and 5.5mm < the width of the data transmission via (18) < 6.5mm.

5. The mechanical structure of a portable fiber optic spectrometer as described in claim 1, characterized in that: the circuit board is fixed to the outer shell (9) by four spacers and bolts, the display screen (8) is fixed to the outer shell (9) by four bolt holes, the display screen (8) is an OLED screen, 21.5mm < length of display screen (8) < 22.5mm, 21.5mm < width of display screen (8) < 22.5mm, and the display screen (8) is used to display the spectral detection results.

6. The mechanical structure of a portable fiber optic spectrometer as described in claim 1, characterized in that: The mechanical dimensions of the optical path layer are 150mm long × 130mm wide × 60mm high; the mechanical dimensions of the circuit layer are 150mm long × 130mm wide × 24mm high; and the mechanical dimensions of the overall structure are 150mm long × 130mm wide × 90mm high.

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