A heat preservation and vibration isolation cabinet for optical feedback cavity enhanced raman spectrum detection instrument

Abstract

This utility model discloses a thermally insulated and vibration-damping enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument, belonging to the field of thermally insulated enclosure technology. It includes an insulation layer inside the main body of the outer shell, a reflective fiber optic coupler inserted into the right side of the main body through an optical path through-hole, and a temperature control component connected to the main body. This utility model uses a simple-structured main body made of high-strength aluminum alloy, with anodized and painted surfaces to improve corrosion resistance. The insulation layer ensures the system maintains internal temperature stability even when external ambient temperatures fluctuate. The temperature control component effectively diffuses the thermal gradient generated by the TEC (Electrical Temperature Coefficient) throughout the entire internal space of the enclosure through forced convection heat transfer, thereby minimizing local temperature differences and achieving a consistent internal temperature field. This maintains stable internal temperature, improves measurement accuracy, and enhances the long-term stability of the laser frequency and the robustness of Raman spectroscopy measurements.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation enclosure technology, specifically a thermal insulation and vibration isolation enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument. Background Technology

[0002] Optical feedback cavity enhanced Raman spectroscopy is extremely sensitive to temperature changes. Due to thermo-optical effects and thermal expansion, temperature variations cause minute displacements in the internal optical path, leading to phase changes in the feedback optical path. This affects the stability of the system's frequency lock, causing the internal optical resonator to "lose lock," resulting in unstable laser power within the resonator. Furthermore, the intensity stability of the laser within the cavity has a significant impact on Raman scattering experiments. Fluctuations in laser power directly lead to changes in the intensity of the scattered Raman light, affecting not only the detection sensitivity of the Raman signal but also reducing the signal-to-noise ratio and measurement repeatability of the Raman spectrum. Particularly in high-precision Raman spectroscopy measurements, temperature changes also affect the laser's frequency drift; even minute fluctuations in laser frequency can affect the identification of the required detector's gas Raman characteristic peaks, thus impacting the accuracy and reliability of experimental results. Therefore, maintaining a relatively constant temperature in the optical feedback cavity enhanced Raman spectroscopy system is of significant theoretical and practical importance for improving the overall performance of the experimental system. However, existing thermal insulation shells generally suffer from insufficient insulation performance, poor sealing, and complex structures, making them unsuitable for the demands of high-precision optical instruments. Utility Model Content

[0003] The purpose of this utility model is to provide a thermally insulated and vibration-damping enclosure for an optical feedback cavity enhanced gas Raman spectroscopy detection instrument, thereby solving the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: A thermally insulated enclosure for an optical feedback cavity enhanced gas Raman spectroscopy detection instrument, comprising an outer shell body, an insulation layer disposed inside the outer shell body, a gas passage hole on the left side of the outer shell body, circuit passage holes on both ends of the front panel of the outer shell body, an optical passage hole on the right side of the outer shell body, a reflective fiber optic coupler inserted into the right side of the outer shell body through the optical passage hole, a temperature control component threadedly connected to the front panel of the outer shell body, one end of a rubber vibration isolation column threadedly connected to the bottom inner side of the outer shell body, and the other end of the rubber vibration isolation column threadedly connected to an Invar base plate. Preferably, the outer shell body is made of high-strength aluminum alloy material, and the surface is anodized and painted.

[0004] Preferably, the insulation layer is a composite insulation layer composed of high-reflectivity aluminum foil and high-performance insulation material.

[0005] Preferably, the temperature control component includes an external fan, a thermoelectric cooler (TEC), a heat sink, an internal fan, and a high-precision temperature control circuit board. The external fan is snapped onto the outer end face of the front panel of the main body of the housing. The external fan is threadedly connected to the thermoelectric cooler (TEC). The thermoelectric cooler (TEC) is threadedly connected to the heat sink. The heat sink is threadedly connected to the internal fan. The heat sink is threadedly connected to the main body of the housing.

[0006] Preferably, the two ends of the semiconductor thermoelectric cooler (TEC) are coated with thermally conductive silicone grease.

[0007] Compared with the prior art, the beneficial effects of this utility model are: This utility model features a simple outer casing made of high-strength aluminum alloy with anodized and painted surfaces for improved corrosion resistance. The black casing increases the absorption of stray light within the system, reducing its impact on the Raman detection signal. An insulation layer effectively suppresses radiative and thermal transfer, ensuring internal temperature stability even under fluctuating external temperatures. A temperature control component effectively diffuses the thermal gradient generated by the TEC (Transient Temperature Coefficient) throughout the entire internal space of the chassis via forced convection heat transfer, minimizing local temperature differences and achieving uniformity and stability of the internal temperature field. This further improves the long-term stability of laser-to-optical resonator frequency locking, intracavity laser power, and laser frequency, enhancing Raman measurement accuracy and instrument robustness. Attached Figure Description

[0008] Figure 1 is a schematic diagram of the main structure of the outer shell of this utility model; Figure 2 is a schematic diagram of the front structure of this utility model; Figure 3 is a top view cross-sectional structural diagram of this utility model; Figure 4 is a schematic diagram of the left-side perspective structure of this utility model; Figure 5 is a schematic diagram of the temperature control component of this utility model.

[0009] In the diagram: 1. Outer shell; 2. Insulation layer; 3. Air passage; 4. Circuit passage; 5. Optical passage; 6. Reflective fiber optic coupler; 7. Temperature control component; 701. External fan; 702. Semiconductor thermoelectric cooler (TEC); 703. Heat sink; 704. Internal fan; 705. High-precision temperature control circuit board; 8. Rubber vibration isolation column; 9. Invar steel base plate. Detailed Implementation

[0010] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0011] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please refer to Figures 1-5. One embodiment of this utility model is provided: a thermal insulation and vibration isolation enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument, comprising a main body 1, an insulation layer 2 inside the main body 1, an air passage 3 on the left side of the main body 1, circuit passages 4 on both sides of the front panel of the main body 1, an optical path passage 5 on the right side of the main body 1, a reflective fiber optic coupler 6 inserted through the optical path passage 5 on the right side of the main body 1, a temperature control component 7 threadedly connected to the front panel of the main body 1, and one end of a rubber vibration isolation column 8 threadedly connected to the bottom inner side of the main body 1. The other end of the rubber vibration isolation column 8 is threadedly connected to an Invar base plate 9. The Invar base plate 9 is used to reduce the influence of temperature on optical path deformation, and the rubber vibration isolation column 8 is used to reduce the influence of vibration on locking.

[0015] Furthermore, the outer shell 1 is made of high-strength aluminum alloy material, and the surface is anodized and painted to improve corrosion resistance. The black shell increases the absorption of stray light in the system and reduces the impact on the Raman light detection signal.

[0016] Furthermore, the insulation layer is a composite insulation layer composed of high-reflectivity aluminum foil and high-performance insulation materials. The aluminum foil layer can effectively suppress radiative heat transfer, while the low thermal conductivity of the insulation cotton significantly reduces conductive heat loss. This combined insulation solution can ensure that the system can maintain the stability of the internal temperature when the external ambient temperature fluctuates.

[0017] Furthermore, the temperature control component 7 includes an external fan 701, a thermoelectric cooler TEC 702, a heat sink 703, an internal fan 704, and a high-precision temperature control circuit board 705. The external fan 701 is snapped onto the outer end face of the front panel of the main body 1. The external fan 701 is threaded to the thermoelectric cooler TEC 702, which is threaded to the heat sink 703. The heat sink 703 is threaded to the internal fan 704 and the main body 1. The thermoelectric cooler TEC 702 serves as the core temperature control element. By adjusting the direction and magnitude of the input current, precise bidirectional temperature control can be achieved, ensuring a uniform temperature field distribution. The temperature control component 7 constitutes a high-efficiency heat dissipation module. Through two sets of exchangers composed of the external fan 701, the thermoelectric cooler TEC 702, the heat sink 703, and the internal fan 704, forced flow heat exchange is achieved, dissipating the TEC... The generated thermal gradient is effectively diffused throughout the entire internal space of the chassis, thereby minimizing local temperature differences and achieving a uniform temperature field inside the chassis.

[0018] Furthermore, the two ends of the semiconductor thermoelectric cooler TEC702 are coated with thermally conductive silicone grease to enhance heat dissipation.

[0019] Workflow: First, power is supplied to the external fan 701 and the internal fan 704. The thermoelectric cooler TEC702 is connected to the high-precision temperature control circuit board 705. The high-precision temperature control circuit board 705 is controlled by computer software. The computer precisely controls the current direction of the thermoelectric cooler TEC702. When the temperature inside the chassis is higher than the set temperature, the output current is positive; when the temperature is lower than the set temperature, the output current is negative. With positive current, the side closer to the inside of the chassis is the cooling surface; with negative current, the side closer to the inside of the chassis is the heating surface. The external fan 701 and the internal fan 704 distribute the temperature field of the thermoelectric cooler TEC702 to all parts of the outer casing 1, thereby controlling the temperature inside the outer casing 1. Experimental tests show that the temperature control can reach ±0.004℃.

[0020] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A thermally insulated and vibration-damping enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument, comprising a main outer shell (1), characterized in that, The outer shell body (1) is provided with a heat insulation layer (2) inside. The outer shell body (1) has an air passage hole (3) on the left side. The front panel of the outer shell body (1) has circuit passage holes (4) on both sides. The outer shell body (1) has an optical passage hole (5) on the right side. The right side of the outer shell body (1) is connected to a reflective fiber optic coupler (6) through the optical passage hole (5). The front panel of the outer shell body (1) is threaded with a temperature control component (7). The bottom of the inner side of the outer shell body (1) is threaded with one end of a rubber vibration isolation column (8). The other end of the rubber vibration isolation column (8) is threaded with an Invar base plate (9).

2. The thermal insulation and vibration isolation enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument according to claim 1, characterized in that: The outer shell body (1) is made of high-strength aluminum alloy material, and the surface is anodized and painted.

3. The thermal insulation and vibration isolation enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument according to claim 1, characterized in that: The insulation layer (2) is a composite insulation layer composed of high reflectivity aluminum foil and high-performance insulation material.

4. The thermal insulation and vibration isolation housing for an optical feedback cavity enhanced Raman spectroscopy detection instrument according to claim 1, characterized in that: The temperature control component (7) includes an external fan (701), a thermoelectric cooler TEC (702), a heat sink (703), an internal fan (704), and a high-precision temperature control circuit board (705). The external fan (701) is snapped onto the outer end face of the front panel of the outer shell body (1). The external fan (701) is threaded to the thermoelectric cooler TEC (702). The thermoelectric cooler TEC (702) is threaded to the heat sink (703). The heat sink (703) is threaded to the internal fan (704). The heat sink (703) is threaded to the outer shell body (1).

5. The thermal insulation and vibration isolation enclosure for an optical feedback cavity enhanced Raman spectroscopy detection instrument according to claim 4, characterized in that: The semiconductor thermoelectric cooler TEC (702) has thermally conductive silicone grease applied to both ends.

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