Spectrometer with double charge coupled devices (CCDs)

Abstract

The utility model discloses a spectrograph with double CCDs, which relates to the technical field of on-line monitoring of stationary pollution sources and comprises a grating adjusting support, a high-resolution spherical grating and a fixing seat are fixedly mounted in the grating adjusting support, a spectrograph base is fixedly mounted at the bottom of the grating adjusting support, and the spectrograph base is fixedly connected with the grating adjusting support. A slit fixing seat and an exit slit adjusting seat are fixedly installed at the top of the spectrometer base and on the side away from the grating adjusting support, and a slit is fixedly installed on the side, close to the high-resolution spherical grating and fixing seat, of the slit fixing seat. The beneficial effects of the utility model are that the resolution of monochromatic light can be adjusted through the grating adjusting support to reach the resolution of 0.3 nm wavelength, and the optical path is adjusted through three positions of the grating adjusting support, the high-resolution spherical grating and fixing seat and the slit fixing seat. And the optical signal received by the spectrograph can be accurately irradiated on the detector.

Description

Technical Field

[0001] The utility model relates to the technical field of online monitoring of fixed pollution sources, in particular to a double-CCD spectrometer. Background Art

[0002] Currently, the measurement principles of similar products on the market are mainly infrared and electrochemical. When the concentration of gaseous pollutants is lower than 100 mg / m3, the accuracy of the instrument's measurement value is not high. Measuring NO2 by ultraviolet differential method can effectively remove the interference of other gases such as water and CO2, so a ultraviolet spectrometer is needed.

[0003] At present, there are some ultraviolet / far-ultraviolet spectrometers with different wavelength bands of ≤200nm and ≥280nm in the world, but there is no ultraviolet spectrometer that can completely cover the 200-450nm band; the spectral resolution of existing equipment is usually around 1nm, and some instruments with higher spectral resolution have problems such as narrow working band and large instrument size. There is no spectrometer that can cover the 200-450nm working band and have a spectral resolution of 0.3nm. For this reason, we propose a dual CCD spectrometer. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a dual-CCD spectrometer, which solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a dual-CCD spectrometer, comprising a grating adjustment bracket, a high-resolution spherical grating and a fixing seat are fixedly installed inside the grating adjustment bracket, a spectrometer base is fixedly installed on the bottom of the grating adjustment bracket, a slit fixing seat and an exit slit adjustment seat are fixedly installed on the top of the spectrometer base and on the side away from the grating adjustment bracket, a slit is fixedly installed on the side of the slit fixing seat close to the high-resolution spherical grating and the fixing seat, a sensor circuit board is fixedly installed on the side of the exit slit adjustment seat away from the high-resolution spherical grating and the fixing seat, and a spectrometer circuit board is fixedly installed on the bottom of the spectrometer base.

[0006] Preferably, the slit is made of a special metal sheet with a μm width. After the light source passes through the 50μm slit, it is split by a high-resolution spherical grating to obtain a plurality of split monochromatic lights. Each split monochromatic light is focused and reflected to the exit position corresponding to the corresponding wavelength of light, and spectral data of different bands are acquired through different detectors.

[0007] Preferably, a 512 image sensor and a 256 image sensor are fixedly installed inside the exit slit adjustment seat and on the side of the sensor circuit board close to the exit slit adjustment seat. The detector adopts a 512 and 256 dual CCD detector, which can cover the 200-450nm working band and is a low-cost wide-band coverage spectrometer with a spectral resolution of 0.3nm.

[0008] Preferably, a high-resolution spherical grating of a spectrometer is fixedly mounted on the grating adjustment bracket, and the high-resolution spherical grating of the spectrometer is mounted on the grating adjustment bracket. The grating adjustment bracket can be adjusted in the horizontal direction, the vertical direction, and the angle within ±10° with the vertical direction.

[0009] Preferably, a narrow-band filter is fixedly installed on the side of the exit slit adjustment seat away from the sensor circuit board, and the size of the narrow-band filter is greater than 380 mm. By adding a narrow-band filter above 380 nm at the front end of the 256 detector, light with a wavelength above 380 nm can be transmitted, thereby preventing interference of light below 380 nm on the 256 detector.

[0010] Preferably, the high-resolution spherical grating of the spectrometer is circular, and the material of the spectrometer is 2083 material, which is less affected by temperature, pressure and vibration.

[0011] The utility model provides a dual CCD spectrometer, which has the following beneficial effects:

[0012] 1. The spectrometer adopts 256+512 pixel dual CCD. The resolution of monochromatic light can be adjusted to a resolution of 0.3nm wavelength through the grating adjustment bracket, the high-resolution spherical grating and the fixed seat and the slit fixed seat to adjust the optical path to ensure that the optical signal received by the spectrometer can be accurately irradiated onto the detector.

[0013] 2. The spectrometer adopts 256+512 pixel dual CCD. It has a simple structure and is easy to operate. It can cover the 200-450nm working band. Furthermore, the material of the spectrometer is 2083, which is less affected by temperature, pressure and vibration factors, and can greatly improve the stability and reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is an exploded view of the utility model.

[0016] In the figure: 1. Grating adjustment bracket; 2. High-resolution spherical grating and fixing seat; 3. Slit; 4. Slit fixing seat; 5. Exit slit adjustment seat; 6. Sensor circuit board; 7. Narrowband filter; 8. Spectrometer base; 9. 512 image sensor; 10. 256 image sensor; 11. Spectrometer circuit board. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] See also Figure 1 to Figure 2 The utility model provides a technical solution: a dual-CCD spectrometer, including a grating adjustment bracket 1, a high-resolution spherical grating and a fixing seat 2 are fixedly installed inside the grating adjustment bracket 1, a spectrometer base 8 is fixedly installed on the bottom of the grating adjustment bracket 1, a slit fixing seat 4 and an exit slit adjustment seat 5 are fixedly installed on the top of the spectrometer base 8 and on the side away from the grating adjustment bracket 1, a slit 3 is fixedly installed on the side of the slit fixing seat 4 close to the high-resolution spherical grating and the fixing seat 2, a sensor circuit board 6 is fixedly installed on the side of the exit slit adjustment seat 5 away from the high-resolution spherical grating and the fixing seat 2, and a spectrometer circuit board 11 is fixedly installed on the bottom of the spectrometer base 8.

[0019] The slit 3 uses a special metal sheet with a width of 40 to 50 μm. After the light source passes through the 50 μm slit, it is split by a high-resolution spherical grating to obtain a plurality of split monochromatic lights. Each split monochromatic light is focused and reflected to the exit position corresponding to the corresponding wavelength light, and spectral data of different bands are obtained through different detectors. A 512 image sensor 9 and a 256 image sensor 10 are fixedly installed inside the exit slit adjustment seat 5 and on the side of the sensor circuit board 6 close to the exit slit adjustment seat 5. The detector uses a 512 and 256 dual CCD detector, which has a simple structure and is easy to operate. It can cover the 200-450nm working band and has a spectral resolution of 0.3nm. It is a low-cost wide-band coverage spectrometer.

[0020] The high-resolution spherical grating of the spectrometer is fixedly mounted on the grating adjustment bracket 1. The high-resolution spherical grating of the spectrometer is installed on the grating adjustment bracket 1. The grating adjustment bracket 1 can be adjusted in the horizontal direction, the vertical direction, and the angle within ±10° with the vertical direction. The grating adjustment bracket 1 ensures that light of different bands is accurately irradiated onto the corresponding CCD detector. The high-resolution spherical grating of the spectrometer is circular. The material of the spectrometer is 2083 material, which is less affected by temperature, pressure, and vibration factors, and can greatly improve the stability and reliability of the product.

[0021] A narrowband filter 7 is fixedly installed on the side of the exit slit adjustment seat 5 away from the sensor circuit board 6. The size of the narrowband filter 7 is greater than 380 mm. By adding a narrowband filter 7 with a wavelength of more than 380 nm at the front end of the 256 detector, light with a wavelength of more than 380 nm can be transmitted, and interference with the 256 detector caused by light below 380 nm can be prevented, thereby improving the anti-interference ability of the spectrometer.

[0022] In summary, the spectrometer using 256+512 pixel dual CCD, when in use, the device adopts the optical path design of grating adjustment bracket 1, high-resolution spherical grating and fixing seat 2, slit 3, slit fixing seat 4, exit slit adjustment seat 5, narrow-band filter 7, 512 image sensor 9 and 256 image sensor 10, through which ultraviolet light is horizontally incident from the window of the incident slit 3, reflected, split and focused by the high-resolution spherical grating, and multiple split monochromatic lights are obtained, each split monochromatic light is focused and reflected to the exit position corresponding to the corresponding wavelength light, and spectral data of different bands are obtained through different detectors.

[0023] The high-resolution spherical grating of the spectrometer is mounted on a grating adjustment bracket 1, and the grating adjustment bracket 1 can be used to adjust the horizontal direction, the vertical direction, and the angle within ±10° with the vertical direction. The grating adjustment bracket 1 ensures that light of different bands is accurately irradiated onto the corresponding CCD detector, and the 512 image sensor 9 and the 256 image sensor 10 arranged on the device cooperate to make the light of 200nm-300nm band transmitted to the 512 image sensor 9, and the light of 400nm-450nm band transmitted to the 256 image sensor 10, and then they are integrated into a graph through software and output simultaneously, so as to avoid the data being unable to be read continuously due to the separate output of the two sensors.

[0024] At the same time, the high-resolution spherical grating of the device and the high-resolution spherical grating selected on the fixed seat 2 have a diameter of 495-505mm and a radius of curvature of 755-765mm. The substrate material is single crystal silicon, and the coating material is AU material to solve the problem that the resolution cannot meet 0.3nm. The narrow-band filter 7 uses a 18.3×11.3×1.3 silicon dioxide filter with a transmission wavelength of more than 380nm, an incident angle of 0°, a transmittance of more than 90% at 380-450nm, a transmittance of 1% below 300nm, and a transmittance of 10% at 300-380nm. The interference caused by light interference is reduced. Further, the material of the spectrometer is 2083 material to ensure that the spectrometer is not affected by factors such as temperature, pressure, and vibration, thereby ensuring the accuracy of the measurement data.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dual CCD spectrometer, comprising a grating adjustment bracket (1), characterized in that: A high-resolution spherical grating and a fixing seat (2) are fixedly mounted inside the grating adjustment bracket (1); a spectrometer base (8) is fixedly mounted on the bottom of the grating adjustment bracket (1); a slit fixing seat (4) and an exit slit adjustment seat (5) are fixedly mounted on the top of the spectrometer base (8) and on a side away from the grating adjustment bracket (1); a slit (3) is fixedly mounted on a side of the slit fixing seat (4) close to the high-resolution spherical grating and the fixing seat (2); a sensor circuit board (6) is fixedly mounted on a side of the exit slit adjustment seat (5) away from the high-resolution spherical grating and the fixing seat (2); and a spectrometer circuit board (11) is fixedly mounted on the bottom of the spectrometer base (8).

2. A dual CCD spectrometer according to claim 1, characterized in that: The slit (3) is made of a metal sheet with a width of 40 to 50 μm.

3. The dual CCD spectrometer according to claim 1, characterized in that: A 512 image sensor (9) and a 256 image sensor (10) are fixedly mounted inside the exit slit adjustment seat (5) and on a side of the sensor circuit board (6) close to the exit slit adjustment seat (5).

4. The dual CCD spectrometer according to claim 1, characterized in that: The grating adjustment bracket (1) is fixedly mounted with a high-resolution spherical grating of a spectrometer.

5. The dual CCD spectrometer according to claim 1, characterized in that: A narrowband filter (7) is fixedly mounted on a side of the exit slit adjustment seat (5) away from the sensor circuit board (6), and the size of the narrowband filter (7) is greater than 380 mm.

6. The dual CCD spectrometer according to claim 1, characterized in that: The high-resolution spherical grating of the spectrometer is circular.

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