Spectrometer with reduced electromagnetic interference

Abstract

This utility model discloses a spectrometer for reducing electromagnetic interference, comprising a main unit housing, a plasma emission power supply module, a circuit board module, an optical device, and a cooling fan assembly. The main unit housing has a cavity containing an electromagnetic interference shield, which divides the cavity into an electrical compartment, a circuit compartment, an optical compartment, and a heat dissipation channel. The plasma emission power supply module is located in the electrical compartment, and the circuit board module is located in the circuit compartment. The circuit board module includes a circuit board, a relay, and an electromagnetic interference filter. The optical device is located in the optical compartment and includes at least a beam splitter, a detector, an optical filter, and an optical signal EMI filter. Thus, the electromagnetic interference filter in the circuit board module can effectively filter out electromagnetic interference at the input or output end, and the optical signal EMI filter in the optical device further processes the optical signal, reducing the impact of electromagnetic interference on the optical signal.

Description

Technical Field

[0001] This utility model relates to the field of spectrometers, and in particular to a spectrometer that reduces electromagnetic interference. Background Technology

[0002] In many fields such as modern scientific research, environmental monitoring, and industrial production, spectrometers play a vital role as an important analytical instrument. By detecting and analyzing light signals, they can obtain information such as the composition and structure of substances. However, with the widespread application of electronic devices and the increasing complexity of the electromagnetic environment, spectrometers are highly susceptible to electromagnetic interference during operation.

[0003] On the one hand, external electromagnetic interference can cause distortion of the light signal detected by the spectrometer, resulting in a large amount of noise in the electrical signal converted by the detector, which seriously affects the accuracy and reliability of spectral analysis. On the other hand, the electronic components of the spectrometer itself, such as the plasma emission power supply module and circuit board module, can also generate electromagnetic interference during operation. This interference can not only affect the normal communication and collaborative work between the various modules inside the instrument, but may also interfere with other electronic devices in the vicinity.

[0004] Currently, spectrometers on the market have many shortcomings in electromagnetic interference protection. Some spectrometers only use simple shielding measures, which cannot effectively resist high-intensity electromagnetic interference. Some spectrometers, although equipped with heat dissipation systems, have poor heat dissipation effects, resulting in excessively high internal temperatures, which further reduces the instrument's resistance to electromagnetic interference and also affects the instrument's lifespan and stability.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of existing technologies, and its main objective is to provide a spectrometer that reduces electromagnetic interference. It utilizes an electromagnetic shielding layer on the inner wall of the main unit housing and an anti-electromagnetic interference plate to form a closed electromagnetic shielding space, effectively blocking external electromagnetic interference from entering the spectrometer and suppressing the propagation of internal electromagnetic interference. This provides a stable electromagnetic environment for the electrical, circuit, and optical compartments within the spectrometer, ensuring the accuracy and reliability of the spectrometer's detection and analysis results. Secondly, the electromagnetic interference filter in the circuit board module effectively filters out electromagnetic interference at the input or output ends, while the optical signal EMI filter in the optical device further processes the optical signal, reducing the impact of electromagnetic interference on the optical signal. This ensures the purity of the spectral signal throughout the entire detection and processing process, improving the spectrometer's analytical accuracy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A spectrometer with reduced electromagnetic interference includes:

[0009] The main unit chassis has a housing cavity, in which an electromagnetic interference shield is installed. The electromagnetic interference shield divides the housing cavity into an electrical compartment, a circuit compartment, an optical compartment, and a heat dissipation channel. The side wall of the main unit chassis has heat dissipation holes that are connected to the heat dissipation channel. The inner wall of the main unit chassis is provided with an electromagnetic shielding layer, which, together with the electromagnetic interference shield, forms a closed electromagnetic shielding space.

[0010] A plasma emission power module, located within the electrical compartment, is used to provide power to the plasma source.

[0011] A circuit board module, located within the circuit compartment, is used to control and process spectral signals. The circuit board module includes a circuit board, relays, and an electromagnetic interference (EMI) filter. The relays control the on / off state of the plasma emission power supply module, and the EMI filter filters out electromagnetic interference at the input or output of the circuit board module. The circuit board module also includes a plasma emission power supply module electrically connected to the circuit board, an EMI filter, an optical filter, an optical signal EMI filter, a cooling fan assembly, and relays.

[0012] An optical device is disposed within the optical cabin. The optical device includes at least a beam splitter, a detector, an optical filter for filtering optical signals of a specific wavelength, and an optical signal EMI filter. The detector is used to convert the optical signal into an electrical signal and output it to the circuit board module.

[0013] A cooling fan assembly, which is respectively installed at the heat dissipation channel, includes a first cooling fan, a second cooling fan, and a third cooling fan; the first cooling fan corresponds to the electrical compartment and is used to dissipate heat from the plasma emission power supply module; the second cooling fan corresponds to the circuit compartment and is used to dissipate heat from the circuit board module; the third cooling fan corresponds to the optical compartment and is used to dissipate heat from the optical device.

[0014] The plasma emission power supply module, electromagnetic interference filter, optical filter, optical signal EMI filter, cooling fan assembly, and relay are all electrically connected to the circuit board.

[0015] As a preferred embodiment, the electromagnetic interference shield includes a metal substrate, a conductive coating, and a grounding terminal. The conductive coating is applied to both sides of the metal substrate, and the grounding terminal is located at the edge of the metal substrate and electrically connected to the grounding terminal of the main unit housing. The metal substrate provides mechanical support, the conductive coating enhances the electromagnetic shielding effect, and the grounding terminal conducts the electromagnetic interference current to the ground. This structure enables the electromagnetic interference shield to efficiently absorb and conduct electromagnetic interference signals, further enhancing the electromagnetic shielding performance inside the spectrometer, ensuring that components in the electrical, circuit, and optical compartments are protected from electromagnetic interference, and improving the reliability of spectrometer signal detection and processing.

[0016] As a preferred embodiment, the metal substrate is made of aluminum alloy; the conductive coating is made of nickel-zinc ferrite. The aluminum alloy metal substrate is lightweight, high-strength, and corrosion-resistant, which reduces the overall weight of the spectrometer while ensuring the structural strength of the anti-electromagnetic interference board, making it easier to transport and install. The nickel-zinc ferrite conductive coating has good absorption and suppression capabilities for high-frequency electromagnetic interference, effectively addressing the impact of high-frequency interference signals on the spectrometer in complex electromagnetic environments, further improving the spectrometer's anti-electromagnetic interference performance, and ensuring the accuracy of the detection results.

[0017] As a preferred embodiment, the beam splitter is a grating or a prism; the detector is a charge-coupled device or a photomultiplier tube.

[0018] As a preferred embodiment, the main unit chassis is made of aluminum alloy.

[0019] As a preferred embodiment, the main unit housing includes an upper housing and a lower housing. The upper housing is connected to the lower housing via a hinge, and the accommodating cavity is located on the lower housing. This facilitates the installation, inspection, and maintenance of components in the internal electrical, circuit, and optical compartments, reducing maintenance difficulty and costs. Simultaneously, this openable structure, while ensuring the housing's airtightness, allows users to easily observe and adjust the spectrometer's internal structure, improving the spectrometer's ease of use and flexibility.

[0020] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly forms a closed electromagnetic shielding space by the electromagnetic shielding layer on the inner wall of the main unit box and the anti-electromagnetic interference plate. This can block external electromagnetic interference from entering the spectrometer in all directions, and at the same time suppress the propagation of electromagnetic interference generated inside the instrument outward. This provides a stable electromagnetic environment for the electrical compartment, circuit compartment and optical compartment inside the spectrometer, ensuring the accuracy and reliability of the spectrometer's detection and analysis results.

[0021] Secondly, the electromagnetic interference filter in the circuit board module can effectively filter out electromagnetic interference at the input or output end, while the optical signal EMI filter in the optical device further processes the optical signal to reduce the impact of electromagnetic interference on the optical signal, thereby ensuring the purity of the spectral signal from detection to processing and improving the analytical accuracy of the spectrometer.

[0022] Next, the enclosure of the main unit is divided into an electrical compartment, a circuit compartment, an optical compartment, and a heat dissipation channel by an anti-electromagnetic interference board. This allows different functional modules to be in independent spaces, reducing mutual interference between modules, facilitating installation, maintenance, and repair, and also improving the overall structural compactness and stability of the instrument.

[0023] Furthermore, the cooling fan assemblies provide targeted heat dissipation for the electrical compartment, circuit compartment, and optical compartment, enabling rapid heat dissipation and effectively reducing the internal temperature of the instrument. This avoids problems such as performance degradation of electronic components and increased sensitivity to electromagnetic interference caused by high temperatures, extending the lifespan of the spectrometer and improving its stability and reliability.

[0024] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0027] Figure 3 This is a top view of an embodiment of the present utility model (the upper housing is not shown);

[0028] Figure 4 This is a control block diagram of an embodiment of the present utility model;

[0029] Figure 5 This is a cross-sectional view of an electromagnetic interference shielding plate according to an embodiment of this utility model.

[0030] Explanation of reference numerals in the attached diagram:

[0031] 10. Main unit chassis 11. Upper chassis

[0032] 12. Lower housing 13. Rotate hinge

[0033] 14. Receptacle cavity 15. Electromagnetic interference shield

[0034] 141. Electrical compartment; 142. Circuit compartment

[0035] 143. Optical compartment; 144. Heat dissipation channel

[0036] 145. Heat dissipation holes; 146. Electromagnetic shielding layer

[0037] 151. Metal substrate; 152. Conductive coating

[0038] 20. Plasma Emission Power Supply Module

[0039] 30. Circuit board module; 31. Relay

[0040] 32. Electromagnetic Interference Filter

[0041] 40. Optical devices 41. Detectors

[0042] 42. Optical filter 43. Optical signal EMI filter

[0043] 50. Cooling fan assembly; 51. First cooling fan

[0044] 52. Second cooling fan 53. Third cooling fan. Detailed Implementation

[0045] Please refer to Figures 1 to 5 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0046] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are 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. They should not be construed as limiting the specific protection scope of this utility model.

[0047] A spectrometer with reduced electromagnetic interference includes a main unit housing 10, a plasma emission power module 20, a circuit board module 30, an optical device 40, and a cooling fan assembly 50.

[0048] Preferably, the main unit housing 10 is made of aluminum alloy. Preferably, the main unit housing 10 includes an upper housing 11 and a lower housing 12. The upper housing 11 is movably connected to the lower housing 12 via a hinge 13. The accommodating cavity 14 is located on the lower housing 12, facilitating the installation, inspection, and maintenance of the internal electrical compartment 141, circuit compartment 142, and optical compartment 143 components by opening the housing, thus reducing maintenance difficulty and costs. Simultaneously, this movable structure, while ensuring the housing's airtightness, facilitates the user's observation and adjustment of the spectrometer's internal structure, improving the spectrometer's ease of use and flexibility.

[0049] The main unit housing 10 has a receiving cavity 14, and an electromagnetic interference shield 15 is disposed inside the receiving cavity 14. The electromagnetic interference shield 15 divides the receiving cavity 14 into an electrical compartment 141, a circuit compartment 142, an optical compartment 143, and a heat dissipation channel 144. The side wall of the main unit housing 10 is provided with heat dissipation holes 145, which are connected to the heat dissipation channel 144. The inner wall of the main unit housing 10 is provided with an electromagnetic shielding layer 146, which together with the electromagnetic interference shield forms a closed electromagnetic shielding space.

[0050] In this embodiment, the electromagnetic shielding layer is a copper foil layer with a thickness of 0.05-0.2mm, covering the entire inner wall of the main unit chassis (including the mating surface between the upper and lower chassis); the edge of the electromagnetic interference shielding plate is sealed to the electromagnetic shielding layer with conductive adhesive; the closed electromagnetic shielding space refers to a closed area with a shielding effectiveness ≥60dB (test frequency 10MHz-1GHz), and electromagnetic leakage is eliminated through the conductive connection between the electromagnetic interference shielding plate and the electromagnetic shielding layer.

[0051] Each heat dissipation hole 145 is equipped with a dustproof sheet. The dustproof sheet at the heat dissipation hole is made of nickel-plated stainless steel and is connected to the grounding terminal of the main unit chassis by conductive bolts to form an electromagnetic shielding barrier. The connection seam between the cooling fan and the heat dissipation channel is filled with conductive silicone to ensure that the integrity of the closed shielding space is not damaged after the fan is installed. The electromagnetic radiation when the fan is working is absorbed by the shielding layer and conducted through grounding.

[0052] The plasma emission power module 20 is located inside the electrical compartment 141 and is used to provide power to the plasma source.

[0053] The circuit board module 30 is housed within the circuit compartment 142 and is used to control and process spectral signals. The circuit board module 30 includes a circuit board, a relay 31, and an electromagnetic interference filter 32. The relay 31 controls the on / off state of the plasma emission power supply module 20, and the electromagnetic interference filter 32 filters out electromagnetic interference (such as power supply noise and signal crosstalk) at the input or output of the circuit board module 30. The high-voltage circuit (voltage ≥ 220V) of the plasma emission power supply module and the low-voltage circuit (voltage ≤ 36V) of the detector are wired separately. The high-voltage circuit is covered with an aluminum shielding tube (diameter 8-10mm) and grounded. The grounding terminals of all circuits converge at the common grounding point of the main unit chassis (grounding resistance ≤ 4Ω) to avoid forming a grounding loop. Corresponding wiring channels can be arranged in the accommodating cavity as needed.

[0054] The optical device 40 is disposed inside the optical cabin 143 and is surrounded by the electromagnetic interference shielding plate 15 of the optical cabin 143 and the electromagnetic shielding layer 146 of the inner wall of the main unit housing 10, thereby being electromagnetically shielded and isolated from the plasma emission power supply module 20 and the circuit board module 30.

[0055] The optical device 40 includes at least a beam splitter, a detector 41, an optical filter 42 for filtering optical signals of a specific wavelength, and an optical signal EMI filter 43; the detector 41 is used to convert the optical signal into an electrical signal and output it to the circuit board module 30; preferably, the beam splitter is a grating or a prism; the detector 41 is a charge-coupled device or a photomultiplier tube.

[0056] Electromagnetic interference (EMI) filters are used to remove electrical signal interference (such as power supply noise and electrical interference from external electromagnetic radiation coupling) at the input / output terminals of circuit boards; optical signal EMI filters are used to remove electromagnetic interference during optical signal transmission (such as high-frequency noise mixed in when optical signals are transmitted in waveguides). EMI filters handle interference in the electrical signal link, while optical signal EMI filters handle interference in the optical signal link, together covering the entire link from optical signal detection to electrical signal conversion to electrical signal processing, ensuring the purity of the spectral signal.

[0057] The cooling fan assemblies 50 are respectively installed at the heat dissipation channels 144, including a first cooling fan 51, a second cooling fan 52, and a third cooling fan 53; the first cooling fan 51 corresponds to the electrical compartment 141 and is used to dissipate heat from the plasma emission power module 20; the second cooling fan 52 corresponds to the circuit compartment 142 and is used to dissipate heat from the circuit board module 30; the third cooling fan 53 corresponds to the optical compartment 143 and is used to dissipate heat from the optical device 40.

[0058] The plasma emission power supply module 20, electromagnetic interference filter 32, optical filter 42, optical signal EMI filter 43, cooling fan assembly 50, detector 41 and relay 31 are all electrically connected to the circuit board.

[0059] The weak electrical signal output by detector 41 needs to be transmitted to the circuit board via a cable, where it is processed by the amplifier circuit and analog-to-digital converter circuit on the circuit board, and finally converted into a digital signal that can be recognized by the data system.

[0060] Preferably, the electromagnetic interference shield 15 includes a metal substrate 151, a conductive coating 152, and a grounding terminal. The conductive coating 152 is coated on both sides of the metal substrate 151, and the grounding terminal is disposed at the edge of the metal substrate 151 and electrically connected to the grounding terminal of the main unit housing 10. The metal substrate 151 provides mechanical support, the conductive coating 152 enhances the electromagnetic shielding effect, and the grounding terminal conducts the electromagnetic interference current to the ground. This structure enables the electromagnetic interference shield 15 to efficiently absorb and conduct electromagnetic interference signals, further enhancing the electromagnetic shielding performance inside the spectrometer, ensuring that the components in the electrical compartment 141, circuit compartment 142, and optical compartment 143 are protected from electromagnetic interference, and improving the reliability of spectrometer signal detection and processing.

[0061] It can employ a soldering process to directly solder the grounding terminal to the edge of the metal substrate 151. This method can form a strong and low-resistance electrical connection, ensuring rapid conduction of induced current. For example, when using soldering, the contact area between the metal substrate 151 and the grounding terminal is heated to fuse the metals, forming a tight integrated structure, reducing contact resistance, ensuring a smooth grounding path, and effectively preventing the accumulation of electromagnetic interference signals.

[0062] Alternatively, bolt fastening can be used. Holes are pre-drilled on the edge of the metal substrate 151, and the grounding terminal is placed in the corresponding position. It is then fixed with fasteners such as bolts, nuts, and spring washers. To enhance conductivity, conductive paste can be applied to the connection area to reduce contact resistance. This method facilitates disassembly and maintenance, and can be easily operated when it is necessary to inspect or replace the grounding terminal. At the same time, it can ensure sufficient connection strength and electrical performance.

[0063] Alternatively, a crimping connection can be used. Using a dedicated crimping tool, pressure is applied to the connection between the grounding terminal and the metal substrate 151 to ensure a tight bond. This method can guarantee good electrical contact and mechanical stability and is often used in the internal structure of spectrometers where space is limited. It ensures a reliable connection between the grounding terminal and the metal substrate 151 and achieves effective electromagnetic shielding.

[0064] Preferably, the metal substrate 151 is made of aluminum alloy; the conductive coating 152 is made of nickel-zinc ferrite. The aluminum alloy material of the metal substrate 151 has the characteristics of being lightweight, high-strength, and corrosion-resistant. While ensuring the structural strength of the anti-electromagnetic interference plate 15, it reduces the overall weight of the spectrometer, making it easier to transport and install. The nickel-zinc ferrite material of the conductive coating 152 has good absorption and suppression capabilities for high-frequency electromagnetic interference, which can effectively cope with the influence of high-frequency interference signals on the spectrometer in complex electromagnetic environments, further improving the spectrometer's anti-electromagnetic interference performance and ensuring the accuracy of the detection results.

[0065] The key design feature of this invention is that it forms a closed electromagnetic shielding space by using the electromagnetic shielding layer on the inner wall of the main unit housing and the anti-electromagnetic interference plate. This space can block external electromagnetic interference from entering the spectrometer from all directions, and at the same time suppress the propagation of electromagnetic interference generated inside the instrument. This provides a stable electromagnetic environment for the electrical compartment, circuit compartment and optical compartment inside the spectrometer, ensuring the accuracy and reliability of the spectrometer's detection and analysis results.

[0066] Secondly, the electromagnetic interference filter in the circuit board module can effectively filter out electromagnetic interference at the input or output end, while the optical signal EMI filter in the optical device further processes the optical signal to reduce the impact of electromagnetic interference on the optical signal, thereby ensuring the purity of the spectral signal from detection to processing and improving the analytical accuracy of the spectrometer.

[0067] Next, the enclosure of the main unit is divided into an electrical compartment, a circuit compartment, an optical compartment, and a heat dissipation channel by an anti-electromagnetic interference board. This allows different functional modules to be in independent spaces, reducing mutual interference between modules, facilitating installation, maintenance, and repair, and also improving the overall structural compactness and stability of the instrument.

[0068] Furthermore, the cooling fan assemblies provide targeted heat dissipation for the electrical compartment, circuit compartment, and optical compartment, enabling rapid heat dissipation and effectively reducing the internal temperature of the instrument. This avoids problems such as performance degradation of electronic components and increased sensitivity to electromagnetic interference caused by high temperatures, extending the lifespan of the spectrometer and improving its stability and reliability.

[0069] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A spectrometer with reduced electromagnetic interference, characterized in that: include: The main unit chassis has a housing cavity, in which an electromagnetic interference shield is installed. The electromagnetic interference shield divides the housing cavity into an electrical compartment, a circuit compartment, an optical compartment, and a heat dissipation channel. The side wall of the main unit chassis has heat dissipation holes that are connected to the heat dissipation channel. The inner wall of the main unit chassis is provided with an electromagnetic shielding layer, which, together with the electromagnetic interference shield, forms a closed electromagnetic shielding space. A plasma emission power module, located within the electrical compartment, is used to provide power to the plasma source. A circuit board module, located within the circuit compartment, is used to control and process spectral signals. The circuit board module includes a circuit board, a relay, and an electromagnetic interference filter. The relay is used to control the on / off state of the plasma emission power supply module, and the electromagnetic interference filter is used to filter out electromagnetic interference at the input or output of the circuit board module. An optical device, disposed within the optical chamber, includes at least a beam splitter, a detector, an optical filter for filtering optical signals of a specific wavelength, and an optical signal EMI filter. The detector is used to convert optical signals into electrical signals and output them to the circuit board module; A cooling fan assembly, which is respectively installed at the heat dissipation channel, includes a first cooling fan, a second cooling fan, and a third cooling fan; the first cooling fan corresponds to the electrical compartment and is used to dissipate heat from the plasma emission power supply module; the second cooling fan corresponds to the circuit compartment and is used to dissipate heat from the circuit board module; the third cooling fan corresponds to the optical compartment and is used to dissipate heat from the optical device. The plasma emission power supply module, electromagnetic interference filter, optical filter, optical signal EMI filter, cooling fan assembly, and relay are all electrically connected to the circuit board.

2. The spectrometer for reducing electromagnetic interference according to claim 1, characterized in that: The electromagnetic interference shield includes a metal substrate, a conductive coating, and a grounding terminal; the conductive coating is applied to both sides of the metal substrate, and the grounding terminal is located at the edge of the metal substrate and is electrically connected to the grounding terminal of the main unit chassis.

3. The spectrometer for reducing electromagnetic interference according to claim 2, characterized in that: The metal substrate is made of aluminum alloy; the conductive coating is made of nickel-zinc ferrite.

4. The spectrometer for reducing electromagnetic interference according to claim 1, characterized in that: The beam splitter is a grating or a prism; the detector is a charge-coupled device or a photomultiplier tube.

5. The spectrometer for reducing electromagnetic interference according to claim 1, characterized in that: The main unit chassis is made of aluminum alloy.

6. The spectrometer for reducing electromagnetic interference according to claim 5, characterized in that: The main unit housing includes an upper housing and a lower housing. The upper housing is connected to the lower housing in a rotatable manner by rotating a hinge, and the accommodating cavity is disposed on the lower housing.

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