A vacuum high-frequency chopper device for a synchrotron radiation light source

Abstract

The application discloses a kind of vacuum high frequency chopping devices for synchrotron radiation source, including vacuum cavity, diaphragm assembly, displacement platform, chopping plate assembly and infrared sensor;The present application will synchrotron radiation source light beam propagate along the light path direction;First through square diaphragm focusing, then through the light transmission port of chopping plate, continuous light signal is cut into pulsed light signal, which is received by receiver.To obtain the frequency of this pulsed light signal, the present application sets an infrared sensor on the displacement platform, the transmitting end and the receiving end of the infrared sensor are respectively on the front and back of the chopping plate surface;Continuous infrared light signal emitted by the transmitting end is converted into pulsed electrical signal output with the same frequency as the pulsed light signal of synchrotron radiation source, and the frequency of pulsed light signal is read from the oscilloscope.The present application strictly matches the ionization, mass spectrometry detection, signal analysis and other system timing used by synchrotron radiation source experimental station, to effectively solve the problem of signal distortion.

Description

Technical Field

[0001] This invention relates to the application of synchrotron radiation sources in the field of optical technology, and in particular to a vacuum high-frequency chopper device for synchrotron radiation sources. Background Technology

[0002] Synchrotron radiation beams are characterized by high brightness, high energy, high coherence, and high collimation, making them an important detection tool in modern science. Europe, the United States, Japan, and my country have all built their own large-scale synchrotron radiation scientific facilities, among which the vacuum high-frequency chopper cavity represents a significant expansion of the application scenarios for synchrotron radiation technology.

[0003] The ionization, mass spectrometry detection, and signal analysis systems used in experimental stations conducting research using synchrotron radiation facilities generally have timing issues. However, because the synchrotron radiation source produces continuous light signals, this timing mismatch with the system's operating sequence will cause distortion of the operating signals of the ionization, mass spectrometry detection, and signal analysis systems.

[0004] Early experiments typically relied on manual post-processing of system signals to correct signal distortion caused by the mismatch between the continuous optical signal from the synchrotron radiation source and the system's operating timing. This approach lacked a systematic and stable solution. Matching the synchrotron radiation source pulse timing with the operating timing of the experimental station's ionization, mass spectrometry detection, and signal analysis systems is a pressing issue that needs to be addressed in the application of synchrotron radiation source technology. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum high-frequency chopper device for synchrotron radiation sources, addressing the shortcomings of existing technologies. This invention maintains the beam of the synchrotron radiation source propagating along the optical path; it first passes through a square aperture in the aperture assembly, focusing the light onto the light-transmitting port on the circumference of the chopper; then, through each light-transmitting port on the circumference of the chopper, the continuous light signal is cut into pulsed light signals; finally, the pulsed light signals are emitted through the light-emitting port of the housing and received by the receiver. To obtain the frequency of this pulsed light signal, this invention sets an infrared sensor on the displacement platform, with the transmitting and receiving ends of the infrared sensor located on opposite sides of the chopper disk, respectively; the light-transmitting ports on the circumference of the chopper synchronously cut the radiation source beam and the infrared beam emitted by the transmitting end, transforming the continuous infrared light signal emitted by the transmitting end into a pulsed infrared light signal with the same frequency as the pulsed light signal of the synchrotron radiation source; the receiving end converts the pulsed infrared light signal into an electrical signal output, transmits it to an oscilloscope via the infrared sensor signal interface, and reads the frequency of the pulsed light signal from the oscilloscope.

[0006] This invention provides a systematic and stable solution to the problem of signal distortion caused by the timing mismatch between synchrotron radiation sources and the ionization, mass spectrometry, and signal analysis systems used in experimental stations. By chopping the synchrotron radiation source, this invention obtains high-frequency pulsed light signals in a vacuum environment. This invention can be widely applied in research fields such as astrochemistry, spectroscopy, and molecular dynamics.

[0007] The specific technical solution for achieving the objective of this invention is as follows:

[0008] A vacuum high-frequency chopper device for a synchrotron radiation source, characterized by a vacuum cavity, an aperture assembly, a displacement platform, a chopper assembly, and an infrared sensor.

[0009] The vacuum chamber consists of a housing, a fluororubber ring, and a top cover. The housing is a box-shaped component with five sides. The housing is positioned in a rectangular coordinate system. On both sides of the housing 11 along the X-axis, there are collinear light inlets and light outlets, forming a light path parallel to the X-axis between the light inlets and light outlets. On one side along the Y-axis, there is an observation port, a motor controller interface, and an infrared sensor signal interface. The bottom of the housing 11 is provided with a breadboard.

[0010] The upper cover is a plate-shaped component, and a pump interface is provided on the upper cover;

[0011] The top cover is fastened to the top opening of the box body, and a fluororubber ring is placed between the top cover and the top opening of the box body;

[0012] The aperture assembly consists of a square aperture and an optical support. The square aperture has an adjustable light-passing port and is mounted on the optical support. The aperture assembly is mounted on the breadboard of the box via the optical support, and the light-passing port of the square aperture coincides with the light path of the box.

[0013] The displacement platform is a three-dimensional moving platform, and the platform is equipped with a motor table and an L-shaped bracket; the displacement platform is mounted on the breadboard of the box body via a base.

[0014] The chopper assembly consists of a stepper motor and a chopper; the chopper is a disc with a mounting hole at its center and several light-transmitting holes evenly distributed around its circumference.

[0015] The chopper disc is perpendicular to the axis of the stepper motor, and the chopper is connected to the output shaft of the stepper motor through a mounting hole.

[0016] The axis of the stepper motor is parallel to the X-axis and is set on the motor table of the displacement platform. One of the light-transmitting holes on the circumference of the chopper coincides with the light path of the housing.

[0017] The signal line of the stepper motor is connected to the motor controller interface of the housing;

[0018] The infrared sensor is provided with a transmitter and a receiver. The infrared sensor is mounted on an L-shaped bracket of the displacement platform. The transmitter and receiver of the infrared sensor are respectively located on the front and back sides of the chopper, and the optical paths of the transmitter and receiver pass through one of the light-transmitting holes on the circumference of the chopper.

[0019] The output signal line of the infrared sensor is connected to the infrared sensor signal interface of the enclosure.

[0020] The displacement platform is a high-precision manual three-dimensional moving platform.

[0021] The periphery of the square aperture assembly is provided with fine-tuning screws for adjusting the light passage.

[0022] The beneficial effects of this invention are:

[0023] 1. Cutting a continuous radiation light source signal into a pulse light source signal: The chopper assembly of this invention consists of a stepper motor and a chopper; the mounting hole on the center of the chopper is connected to the output shaft of the stepper motor, and several light-transmitting holes are evenly distributed on the circumference of the chopper; the axis of the stepper motor is set parallel to the X-axis on the motor table of the displacement platform, and one of the light-transmitting holes on the circumference of the chopper is aligned with the light path of the housing; the chopping frequency of the chopper is controlled by the rotation speed of the stepper motor to obtain the cut pulse light source signal.

[0024] 2. Generating high-frequency optical pulse signals: The present invention has 48 light-transmitting holes evenly distributed on the circumference of the chopper. Driven by a stepper motor, the continuous optical signal of the synchrotron radiation source can be divided into 16 kHz optical pulse signals.

[0025] 3. Obtaining the frequency of the pulsed light source signal: In this invention, an infrared sensor is set on the displacement platform. When the chopper rotates, the light-transmitting port on the circumference of the chopper synchronously cuts the light beam of the radiation source and the infrared light beam emitted by the transmitting end of the infrared sensor. The continuous infrared light signal emitted by the transmitting end is transformed into a pulsed infrared light signal with the same frequency as the pulsed light signal of the synchrotron radiation source. The receiving end converts the pulsed infrared light signal into an electrical signal output, which is transmitted to the oscilloscope through the infrared sensor signal interface. The signal frequency is read from the oscilloscope, and this frequency is the frequency of the pulsed light source signal.

[0026] 4. Setting up the light path: To ensure that the light-transmitting holes on the circumference of the chopper and the light-transmitting opening of the square aperture coincide with the light path of the housing, this invention sets up a motor platform on the displacement platform and places the stepper motor on the motor platform of the displacement platform; by adjusting the displacement platform, the light-transmitting holes on the chopper are aligned with the light path, and by adjusting the fine-tuning screws around the square aperture, the light-transmitting opening of the square aperture is aligned with the light path.

[0027] 5. Position adjustment of the transmitter and receiver on the infrared sensor: In order to ensure that the optical path of the transmitter and receiver on the infrared sensor coincides with the light-transmitting hole on the circumference of the chopper, the present invention sets an L-shaped bracket on the displacement platform, and places the transmitter and receiver on the infrared sensor on the L-shaped bracket of the displacement platform. By adjusting the displacement platform and the L-shaped bracket, the light-transmitting hole on the chopper is made to coincide with the optical path of the transmitter and receiver.

[0028] The technical problem solved by this invention is:

[0029] When the continuous light signal from the synchrotron radiation source continuously ionizes sample molecules, the sample molecules are ionized outside the detection cycle of the time-of-flight mass spectrometer, which will result in extremely poor ion spatial resolution in the time-of-flight mass spectrometer.

[0030] This invention segments the continuous light signal from a synchrotron radiation source into a high-frequency pulsed light signal, ensuring that the period of the high-frequency pulsed light signal is strictly consistent with the detection period of the time-of-flight mass spectrometry (TOFMS) detector. This ensures that sample molecules are ionized only within the detection period of the TOFMS detector, thereby improving the resolution of the ion space in the TOFMS detector.

[0031] This invention effectively solves the problem of signal distortion by strictly matching the chopping frequency to the operating timing of the ionization, mass spectrometry detection, and signal analysis systems used in the synchrotron radiation source experimental station. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the B-B direction structure;

[0034] Figure 3 for Figure 1 A--A direction structural diagram;

[0035] Figure 4 for Figure 1 A magnified view of a portion at point C;

[0036] Figure 5 for Figure 1 Top view;

[0037] Figure 6 for Figure 2 A bottom view;

[0038] Figure 7 This is a schematic diagram of the chopper. Detailed Implementation

[0039] Example

[0040] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 This invention is used in conjunction with a synchrotron radiation source, receiver, dry pump, oscilloscope, and motor controller:

[0041] The present invention connects to the dry pump through the pump interface 118 of the top cover 13; the light inlet 111 on the housing 11 is connected to the synchrotron radiation source, and the light outlet 112 is connected to the receiver; the stepper motor 41 in the chopper assembly 4 is connected to the motor controller through the motor controller interface 115 on the housing 11, and the infrared sensor 5 is connected to the oscilloscope through the infrared sensor signal interface 116 on the housing 11.

[0042] See Figure 1 , Figure 2 , Figure 3 , Figure 4 Figure 7 illustrates the adjustment process of this invention:

[0043] Adjusting the light-transmitting holes 422 on the circumference of the chopper 42 to coincide with the light path 113 of the housing 11: In this invention, a motor platform 31 is set on the displacement platform 3, and the stepper motor 41 is set on the motor platform 31 of the displacement platform 3. By adjusting the coordinate position on the displacement platform 3, the light-transmitting holes 422 on the circumference of the chopper 42 are successively aligned with the light path 113 of the housing 11.

[0044] Adjusting the optical path of the transmitter 51 and receiver 52 to coincide with the light-transmitting hole 422 of the chopper 42: In this invention, an L-shaped bracket 32 ​​is set on the displacement platform 3, and the transmitter 51 and receiver 52 of the infrared sensor 5 are placed on the L-shaped bracket 32 ​​of the displacement platform 3; by adjusting the displacement platform 3 and the L-shaped bracket 32, the position of the transmitter 51 and receiver 52 of the infrared sensor 5 is adjusted so that the optical path of the transmitter 51 and receiver 52 of the infrared sensor 5 coincides with the light-transmitting hole 422 on the circumference of the chopper 42 in sequence;

[0045] Adjusting the light-transmitting opening of the square aperture 21 to coincide with the light path 113 of the housing 11: The aperture assembly 2 of the present invention is composed of a square aperture 21 and an optical support 22. The square aperture 21 is disposed on the optical support 22, and the aperture assembly 2 is disposed on the breadboard 117 of the housing 11 via the optical support 22. The periphery of the square aperture 21 is provided with fine-tuning screws for adjusting the light-transmitting opening. By adjusting the fine-tuning screws, the light-transmitting opening of the square aperture 21 is made to coincide with the light path 113 of the housing 11.

[0046] See Figure 1 , Figure 2 , Figure 3 , Figure 4Figure 7 illustrates the working process of this invention:

[0047] Vacuuming: First, use the dry pump connected to the pump interface 118 on the upper cover 13 to evacuate the vacuum chamber 1 to a vacuum state;

[0048] Acquiring pulsed light signals: The beam of the synchrotron radiation source enters the housing 111 through the light inlet 111 along the light path 113 and continues to propagate along the direction of the light path 113; it first passes through the square aperture 21 in the aperture assembly 2 and is focused onto the light transmission port 422 on the circumference of the chopper 42; then, it passes through each light transmission port 422 on the circumference of the chopper 42 driven by the stepper motor 41, cutting the continuous light signal into pulsed light signals; finally, the pulsed light signals are emitted through the light outlet 112 on the housing 11 and received by the receiver connected to the light outlet 112 to obtain the pulsed light signal. This invention converts the continuous light signal into a pulsed light signal with the timing consistent with the receiver, restoring the distorted signal;

[0049] To obtain the frequency of the pulsed light signal: In this invention, an infrared sensor 5 is set on the displacement platform 3. The transmitting end 51 and the receiving end 52 of the infrared sensor 5 are respectively located on the front and back sides of the chopper plate 42. The infrared beam emitted by the transmitting end 51 is parallel to the beam of the synchrotron radiation source. The two light-transmitting holes 422 on the circumference of the chopper plate 42 cut the beam of the radiation source and the infrared beam emitted by the transmitting end 51 simultaneously. The continuous infrared light signal emitted by the transmitting end 51 is transformed into a pulsed infrared light signal with the same frequency as the pulsed light signal of the synchrotron radiation source. The receiving end 52 converts the pulsed infrared light signal into an electrical signal output, which is transmitted to the oscilloscope through the infrared sensor signal interface 116. The frequency of the infrared light signal is read from the oscilloscope. Since the infrared light signal and the pulsed light signal have the same frequency, the pulsed light signal of the synchrotron radiation source is finally obtained.

[0050] This invention segments the continuous optical signal from a synchrotron radiation source into high-frequency pulsed optical signals, ensuring that the period of these pulsed signals is strictly matched with the detection period of a time-of-flight mass spectrometry (TOF-MS) detector. This guarantees that sample molecules are ionized only within the TOF-MS detector's detection period, thereby improving the spatial resolution of ions in the TOF-MS detector. Furthermore, this invention effectively solves the problem of signal distortion by precisely matching the chopping frequency to the operating timing of the ionization, mass spectrometry detection, and signal analysis systems used in the synchrotron radiation source experimental station.

Claims

1. A vacuum high-frequency chopper device for a synchrotron radiation light source, characterized by, It includes a vacuum chamber (1), an aperture assembly (2), a displacement platform (3), a chopper assembly (4), and an infrared sensor (5). The vacuum chamber (1) is composed of a box body (11), a fluororubber ring (12) and a top cover (13). The box body (11) is a box-shaped component with five sides. The box body (11) is located in a rectangular coordinate system. On the two sides of the box body (11) along the X-axis, there are collinear light inlets (111) and light outlets (112), respectively. That is, the light inlets (111) and light outlets (112) form a light path (113) parallel to the X-axis. On one side of the Y-axis, there is an observation port (114), a motor controller interface (115) and an infrared sensor signal interface (116). The bottom surface of the box body (11) is provided with a breadboard (117). The upper cover (13) is a plate-shaped piece, and a pump interface (118) is provided on the upper cover (13). The top cover (13) is fastened to the top opening of the box body (11), and the fluororubber ring (12) is located between the top cover (13) and the top opening of the box body (11); The aperture assembly (2) consists of a square aperture (21) and an optical support (22). The square aperture (21) has an adjustable light-passing port. The square aperture (21) is mounted on the optical support (22). The aperture assembly (2) is mounted on the breadboard (117) of the box (11) via the optical support (22). The light-passing port of the square aperture (21) coincides with the light path (113) of the box (11). The displacement platform (3) is a three-dimensional moving platform, and the platform is provided with a motor table (31) and an L-shaped bracket (32); the displacement platform (3) is mounted on the breadboard (117) of the box body (11) via a base; The chopper assembly (4) consists of a stepper motor (41) and a chopper (42); the chopper (42) is a disc with a mounting hole (421) at its center and several light-transmitting holes (422) evenly distributed on its circumference. The chopper (42) has its disk surface perpendicular to the axis of the stepper motor (41), and the chopper (42) is connected to the output shaft of the stepper motor (41) through the mounting hole (421); The axis of the stepper motor (41) is parallel to the X-axis and is set on the motor table (31) of the displacement platform (3). One of the light-transmitting holes (422) on the circumference of the chopper (42) coincides with the light path (113) of the housing (11). The signal line of the stepper motor (41) is connected to the motor controller interface (115) of the housing (11); The infrared sensor (5) is provided with a transmitter (51) and a receiver (52). The infrared sensor (5) is mounted on an L-shaped bracket (32) of the displacement platform (3). The transmitter (51) and receiver (52) on the infrared sensor (5) are respectively located on the front and back sides of the chopper (42), and the light paths of the transmitter (51) and receiver (52) pass through one of the light-transmitting holes (422) on the circumference of the chopper (42). The output signal line of the infrared sensor (5) is connected to the infrared sensor signal interface (116) of the housing (11).

2. The vacuum high-frequency chopper device for a synchrotron radiation source according to claim 1, characterized in that, The displacement platform (3) is a high-precision manual three-dimensional moving platform.

3. The vacuum high-frequency chopper device for a synchrotron radiation source according to claim 1, characterized in that, The periphery of the square aperture (21) on the aperture assembly (2) is provided with fine-tuning screws for adjusting the light passage.

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