CCD (Charge Coupled Device) detection mechanism and Raman testing device

Abstract

The utility model discloses a CCD detection mechanism and a Raman test device, an acoustic power input device is adopted to enable a gas medium close to a hot end in a resonance tube to vibrate to generate sound waves, the gas medium can generate adiabatic expansion in the process from the hot end to a cold end, and therefore the gas medium can temporarily stay to absorb heat generated by a CCD detector when reaching the cold end, and the Raman test efficiency is improved. Adiabatic compression occurs in the process that the gas medium leaves the cold end and returns to the hot end, so that heat is released to the outside through the hot end when the gas medium reaches the hot end, enough heat of the CCD detector can be absorbed by circulating the gas medium between the cold end and the hot end under the action of sound pressure, and meanwhile, the magnitude of sound power input is better controlled; therefore, the cooling capacity is convenient to control, and the CCD detector is maintained to continuously and stably operate at a lower temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical testing, in particular to a CCD detection mechanism and a Raman testing device. BACKGROUND

[0002] Raman spectrum is a light scattering phenomenon, light will be scattered on different substances in the process of propagation, and the shorter the wavelength of light, the more serious the scattering. The wavelength of light determines not only the color of light but also the energy of light. The shorter the wavelength, the greater the energy, and the longer the wavelength, the smaller the energy. If light is scattered, the wavelength of light, that is, the energy of light, may change during the scattering process. One in every hundred million scattered photons transfers part of the energy to the substance causing scattering. This special physical phenomenon was first discovered by the Indian physicist Raman. If a photon does not lose energy after scattering, that is, does not change its wavelength, this scattering is called Rayleigh scattering or elastic scattering. If a small probability of light loss occurs, the scattering process is called Raman scattering or inelastic scattering.

[0003] Observing Raman scattering requires a CCD detector, and the CCD detector is prone to thermal noise with increasing working temperature. In order to suppress dark current noise, the CCD detector should generally work at low temperature. Therefore, in order to make the CCD detector obtain higher working efficiency, the temperature of the CCD detector needs to be strictly controlled, and the CCD detector needs to work at the best temperature to collect high-quality spectrum.

[0004] In the prior art, the CCD detector is usually cooled by a semiconductor refrigeration device. However, the refrigeration coefficient of the semiconductor refrigeration device is small, the power consumption is large, and the cooling effect of the CCD detector is insufficient. Although relatively low temperature can be obtained by using liquid nitrogen, it is not easy to control, is relatively dangerous, and the temperature rise and fall is not easy to adjust. Practical new type content

[0005] The purpose of the present application is to provide a CCD detection mechanism and a Raman testing device, which can maintain the CCD detector to continuously and stably operate at a low temperature.

[0006] The embodiment of the present application can be implemented as follows:

[0007] In a first aspect, the utility model provides a kind of CCD detection mechanism, including CCD detector and cooling assembly;

[0008] The cooling assembly includes an acoustic power input device and a resonant tube, the resonant tube has a gas medium, the resonant tube has a cold end and a hot end at both ends, the acoustic power input device corresponds to the hot end, for making the gas medium in the resonant tube close to the hot end vibrate;

[0009] The CCD detector corresponds to the cold end and is used for heat exchange with the cold end.

[0010] In an optional embodiment, the cooling assembly further comprises a cold end heat exchanger connected with the cold end and capable of heat exchange with the CCD detector.

[0011] In an optional embodiment, the cold end heat exchanger is arranged on the peripheral wall of the resonant tube and covers at least one half of the length of the resonant tube.

[0012] In an optional embodiment, the cooling assembly further comprises a hot end heat exchanger connected with the hot end and used for releasing heat.

[0013] In an optional embodiment, the hot end heat exchanger is arranged on the end of the resonant tube.

[0014] In an optional embodiment, the cooling assembly further comprises a stack arranged in the resonant tube, and each channel of the stack penetrates through both ends of the stack.

[0015] In an optional embodiment, the inner wall of the channel is uneven.

[0016] In an optional embodiment, the stack is located at a position of one fourth of the length of the resonant tube and is close to the hot end away from the cold end.

[0017] In an optional embodiment, the acoustic power inputter comprises a heat source arranged on the peripheral wall of the resonant tube, and the heat source is used for heating the gaseous medium close to the cold end in the resonant tube to make the gaseous medium vibrate.

[0018] In a second aspect, the utility model provides a raman testing device, including any preceding embodiment of the CCD detection mechanism.

[0019] Compared with the prior art, the beneficial effects of the embodiment of the application include, for example:

[0020] The acoustic power inputter makes the gaseous medium close to the hot end in the resonant tube vibrate to generate sound waves, and the gaseous medium will undergo adiabatic expansion from the hot end to the cold end, so that the gaseous medium will temporarily stop at the cold end to absorb the heat generated by the CCD detector, and the gaseous medium will undergo adiabatic compression when leaving the cold end and returning to the hot end, so that the gaseous medium will release heat to the outside through the hot end when reaching the hot end. In this way, the gaseous medium can absorb enough heat of the CCD detector by circulating back and forth between the cold end and the hot end through the sound pressure, and the size of the acoustic power input is also better controlled, so that the cooling capacity is also easy to control, thereby maintaining the stable operation of the CCD detector at a lower temperature. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative work based on these drawings are within the scope of protection of the present application.

[0022] Figure 1 A schematic diagram of a cooling assembly according to an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a Raman testing device according to an embodiment of the present application.

[0024] Legend: 1 - laser; 2 - interference filter; 3 - power attenuator; 4 - sample; 5 - microscope; 6 - Rayleigh filter; 7 - confocal pinhole; 8 - slit; 9 - grating; 10 - CCD detector; 11 - cooling assembly; 110 - resonator tube; 111 - heat source; 112 - cold end heat exchanger; 113 - hot end heat exchanger; 114 - stack; 115 - cold end; 116 - hot end. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0027] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0028] In the description of the present application, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the present application, it also needs to be explained that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Observing Raman scattering requires four main components, a laser 1, a filter, a spectrograph, and a CCD. Focusing the laser on the sample 4 allows a large number of energy photons of the same wavelength to interact with the sample 4, a small part of which is scattered as Raman scattering; filtering, the filter used by the Raman spectrometer allows Raman scattering light with a longer wavelength to pass through, while blocking Rayleigh scattering light whose wavelength does not change, so that only Raman scattering is left; the spectrograph separates light of different wavelengths, and the spectrograph has an effect similar to a triangular prism, different wavelengths of light will be directed to different angles, and finally these Raman scattered photons will fall on different positions of the CCD.

[0032] The CCD detector 10 is a silicon-based multi-channel array detector, which can detect ultraviolet light, visible light and near-infrared light. Because it is a high-sensitivity semiconductor device, it is suitable for analyzing weak Raman signals. In addition, the CCD detector 10 allows multi-channel operation, which can detect the entire spectrum in one sampling, so it is very suitable for detecting Raman signals. The application of CCD is very wide. In digital cameras, CCD can be used as a sensor, and in scientific spectrometers, more advanced CCDs are used to obtain better sensitivity, uniformity and noise characteristics. In a general Raman spectrometer, Raman scattering is first dispersed by a diffraction grating 9, and then projected onto the long axis of the CCD array. The first pixel detects the low-frequency starting signal of the spectrum, the second pixel detects the signal at the next spectral position, and so on. The last pixel will detect the high-frequency terminal signal of the spectrum.

[0033] In the prior art, the CCD detector 10 is usually cooled by a semiconductor refrigeration device. However, the refrigeration coefficient of the semiconductor refrigeration device is small, the power consumption is large, and the cooling effect of the CCD detector 10 is insufficient. Using liquid nitrogen can produce a relatively low temperature, but it is not easy to control, is relatively dangerous, and the temperature rise and fall is not easy to adjust.

[0034] Therefore, the inventor has provided the following embodiments for improvement. Some embodiments of the application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the embodiments described below and the features in the embodiments can be combined with each other.

[0035] Reference Figure 1 And Figure 2 The embodiment of the application discloses a CCD detection mechanism, which comprises a CCD detector 10 and a cooling assembly 11. The cooling assembly 11 comprises an acoustic power input device and a resonant tube 110. The resonant tube 110 contains a gas medium. The resonant tube 110 has a cold end 115 and a hot end 116 at both ends. The acoustic power input device corresponds to the hot end 116 and is used to make the gas medium close to the hot end 116 in the resonant tube 110 vibrate. The CCD detector 10 corresponds to the cold end 115 and is used for heat exchange with the cold end 115.

[0036] Thus, the acoustic power input device makes the gas medium in the resonant tube 110 close to the hot end 116 vibrate to generate sound waves, and the gas medium will undergo adiabatic expansion from the hot end 116 to the cold end 115, so that the gas medium will stop for a short time to absorb the heat generated by the CCD detector 10 when reaching the cold end 115, and the gas medium will undergo adiabatic compression when leaving the cold end 115 to return to the hot end 116, so that the gas medium will release heat to the outside through the hot end 116 when reaching the hot end 116. Thus, the gas medium circulating between the cold end 115 and the hot end 116 through the sound pressure can absorb sufficient heat of the CCD detector 10, and the size of the acoustic power input is also better controlled, so that the cooling capacity is also better controlled, thereby maintaining the CCD detector 10 to operate stably at a lower temperature.

[0037] In order to make the expanded gas in the resonant tube 110 absorb the heat generated by the CCD detector 10 during operation, the cooling assembly 11 further comprises a cold end heat exchanger 112 connected with the cold end 115 and capable of exchanging heat with the CCD detector 10.

[0038] In order to accelerate the release speed of heat at the hot end 116, the cooling assembly 11 further comprises a hot end heat exchanger 113 connected with the hot end 116 for releasing heat.

[0039] The acoustic power input device comprises a heat source 111 arranged on the peripheral wall of the resonant tube 110, and the heat source 111 is used to heat the gas medium close to the cold end 115 in the resonant tube 110 to generate a thermoacoustic effect, so that the gas medium vibrates, and thus the thermal energy is converted into acoustic energy, and the acoustic energy carries the heat from the cold end 115 to the hot end 116 to be consumed in the resonant tube 110.

[0040] In addition, the cooling assembly 11 further comprises a stack 114 arranged in the resonant tube 110, and each channel of the stack 114 penetrates through both ends of the stack 114, and the inner wall of the channel has a concave-convex structure to optimize and concentrate the propagation path of the sound wave. After absorbing the heat of the CCD detector 10 from the cold end 115, the contracted gas medium passes through the channel of the stack 114 to reach the hot end 116, and a part of the heat can be absorbed by the stack 114 and then released, thereby increasing the path of releasing heat.

[0041] The stack 114 is located at a position of one quarter of the length of the resonant tube 110 and close to the hot end 116 away from the cold end 115. Under the action of temperature difference, the gas molecules perform thermal diffusion in the channel inside the stack 114, thereby generating pressure fluctuation and exciting sound waves. In this way, the pressure and displacement changes of the sound waves are maximized, thereby generating the maximum temperature difference and the highest thermoacoustic conversion efficiency. This design is based on acoustic standing wave mode, thermodynamic principle and a large number of experimental verification, and is the most common optimized configuration in thermoacoustic equipment.

[0042] Correspondingly, the hot end heat exchanger 113 is arranged on the circumferential wall of the resonant tube 110 and covers at most one fourth of the length of the resonant tube 110, so as to conduct the heat of the CCD detector 10 to the expanded gas medium with a larger contact area, thereby transporting the heat to the hot end 116 for release. The cold end heat exchanger 112 is arranged at the end of the resonant tube 110, facilitating the release of heat, and also facilitating leaving a region on the resonant tube 110 near the hot end 116 for installation of the acoustic power input device.

[0043] The gas medium is compressed gas, and can be carbon dioxide, hydrocarbon, nitrogen, helium or other inert gas as long as the compressibility and large expansion coefficient are met.

[0044] The embodiment also discloses a Raman testing device, which comprises the laser 1, the interference filter 2, the power attenuation sheet 3, the sample 4, the microscope 5, the Rayleigh filter 6, the confocal pinhole 7, the slit 8, the grating 9 and the CCD detection mechanism of the above embodiment. The structure and principle function of the testing device are the same as those in the prior art except that the cooling assembly 11 is different from those in the prior art, and thus will not be described in detail here.

[0045] In summary, the embodiment of the present application discloses a CCD detection mechanism and a Raman testing device. The acoustic power input device is used to make the gas medium in the resonant tube 110 near the hot end 116 vibrate to generate sound waves. The gas medium will undergo adiabatic expansion from the hot end 116 to the cold end 115, so that the gas medium will temporarily stop at the cold end 115 to absorb the heat generated by the CCD detector 10. The gas medium will undergo adiabatic compression when leaving the cold end 115 and returning to the hot end 116, so that the gas medium will release heat to the outside through the hot end 116 when reaching the hot end 116. In this way, the gas medium can absorb enough heat of the CCD detector 10 through the sound pressure acting between the cold end 115 and the hot end 116, and the size of the acoustic power input is also better controlled, so that the cold energy is also better controlled, thereby maintaining the CCD detector 10 to continuously and stably operate at a lower temperature.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A CCD detection mechanism, characterized by, The CCD detector (10) and the cooling assembly (11); The cooling assembly (11) comprises an acoustic power input device and a resonant tube (110), the resonant tube (110) has a gas medium therein, the resonant tube (110) has a cold end (115) and a hot end (116) at two ends respectively, the acoustic power input device corresponds to the hot end (116) and is used for vibrating the gas medium close to the hot end (116) in the resonant tube (110); The CCD detector (10) corresponds to the cold end (115) and is used for heat exchange with the cold end (115).

2. The CCD detection mechanism according to claim 1, wherein, The cooling assembly (11) further comprises a cold end heat exchanger (112), the cold end heat exchanger (112) is connected with the cold end (115) and can exchange heat with the CCD detector (10).

3. The CCD detection mechanism according to claim 2, wherein, The cold end heat exchanger (112) is arranged on the peripheral wall of the resonant tube (110) and covers at least one half of the length of the resonant tube (110).

4. The CCD detection mechanism of claim 1, wherein, The cooling assembly (11) further comprises a hot end heat exchanger (113), the hot end heat exchanger (113) is connected with the hot end (116) and is used for releasing heat.

5. The CCD detection mechanism of claim 4, wherein, The hot end heat exchanger (113) is arranged at the end of the resonant tube (110).

6. The CCD detection mechanism according to any one of claims 1-5, wherein, The cooling assembly (11) further comprises a stack (114), the stack (114) is arranged in the resonant tube (110), and each channel of the stack (114) penetrates through two ends of the stack (114).

7. The CCD detection mechanism of claim 6, wherein, The inner wall of the channel is in a concave-convex structure.

8. The CCD detection mechanism of claim 6, wherein, The stack (114) is located at a quarter of the length of the resonant tube (110) and is close to the hot end (116) and away from the cold end (115).

9. The CCD detection mechanism of claim 1, wherein, The acoustic power input device comprises a heat source (111), the heat source (111) is arranged on the peripheral wall of the resonant tube (110), and the heat source (111) is used for heating the gas medium close to the cold end (115) in the resonant tube (110) to vibrate the gas medium.

10. A Raman testing device, characterized by, The CCD detector device comprises the CCD detector according to any one of claims 1-9.

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