CN112230450B - AOM control system and control method thereof - Google Patents
AOM control system and control method thereof Download PDFInfo
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- CN112230450B CN112230450B CN202011230223.9A CN202011230223A CN112230450B CN 112230450 B CN112230450 B CN 112230450B CN 202011230223 A CN202011230223 A CN 202011230223A CN 112230450 B CN112230450 B CN 112230450B
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- MKGHDZIEKZPBCZ-ULQPCXBYSA-N methyl (2s,3s,4r,5r,6r)-4,5,6-trihydroxy-3-methoxyoxane-2-carboxylate Chemical compound CO[C@H]1[C@H](O)[C@@H](O)[C@H](O)O[C@@H]1C(=O)OC MKGHDZIEKZPBCZ-ULQPCXBYSA-N 0.000 claims 9
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/113—Circuit or control arrangements
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Abstract
The invention relates to a control system and a control method of an AOM, wherein a remote control end is connected with an MCU through an RS232 interface, the MCU is connected with a clock generator, the clock generator is connected with a filter, the filter is connected with an amplifier I, the amplifier I is connected with a mixer I, the TTL interface is connected with a buffer, the buffer is connected with the mixer I, the mixer I is connected with an amplifier II, the amplifier II is connected with a mixer II, the mixer II is connected with an attenuator, the attenuator is connected with an amplifier III, the amplifier III is connected with an amplifier IV, the amplifier IV is connected with a VSWR measuring module, the VSWR measuring module is connected with the AOM, the VSWR measuring module is connected with the MCU, the MCU is connected with the amplifier IV, the analog interface is connected with an analog driving circuit, and the analog driving circuit is connected with the attenuator. The aim of reducing cost and integrating easiness is achieved by adopting a technology combining variable carrier frequency and variable carrier output energy, and the carrier energy stability on a carrier frequency interval is high.
Description
Technical Field
The invention relates to an AOM control system and a control method thereof.
Background
The AOM (Acousto-optical Modulators), an acousto-optic modulator, is composed of an acousto-optic medium and a piezoelectric transducer. When a certain specific carrier frequency of the driving source drives the transducer, the transducer can generate ultrasonic waves with the same frequency and transmit the ultrasonic waves into the acousto-optic medium, the refractive index of the acousto-optic medium is changed immediately, when a light beam passes through the medium, the propagation direction of the light beam can generate diffraction, and the energy of the carrier controls the diffraction efficiency. Controlling the frequency of the carrier and the energy level of the carrier is therefore a very important link in the control system of the AOM.
At present, an AOM control system mostly adopts fixed carrier frequency and fixed carrier output power, and for a laser using multiple types of AOMs, multiple types of AOM control systems are needed, so that the cost is high, the AOM control system is not easy to integrate, and the limitation is obvious.
Therefore, according to practical requirements, it is important to design an AOM control system with low cost, adjustable carrier frequency and stable and reliable performance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an AOM control system and an AOM control method.
The aim of the invention is achieved by the following technical scheme:
the AOM control system is characterized in that: the remote control end is connected with the MCU through an RS232 interface, the MCU is connected with a clock generator, the clock generator is connected with a filter, the filter is connected with the first amplifier, the first amplifier is connected with the first mixer, the TTL interface is connected with a buffer, the buffer is connected with the first mixer, the first mixer is connected with the second amplifier, the second amplifier is connected with the second mixer, the second mixer is connected with an attenuator, the third attenuator is connected with the third amplifier, the fourth amplifier is connected with a VSWR measuring module, the VSWR measuring module is connected with an AOM, the VSWR measuring module is connected with the MCU, the MCU is connected with the fourth amplifier, the analog quantity interface is connected with an analog driving circuit, and the analog driving circuit is connected with the attenuator.
Further, in the control system of the AOM, a temperature sensor for detecting the temperature of the amplifier is connected to the MCU.
Further, in the control system of the AOM, the MCU is an MCU of STM32F103ZET 6.
Further, in the control system of the AOM, the first amplifier, the second amplifier, the third amplifier and the fourth amplifier are all radio frequency operational amplifiers.
Further, in the control system of the AOM, the first mixer and the second mixer are double balanced mixers.
Further, the AOM control system is characterized in that the clock generator is an ADF4360-8 clock generator with the frequency output range of 65 MHz-400 MHz; the filter is a pi-type chebyshev low-pass filter; the attenuator is a model HMC346AMS8GE attenuator.
Further, in the AOM control system, the analog driving circuit is a voltage follower, and the buffer is a gate non-inverting chip MC74VHC1G50DFT1G.
Further, in the control system of the AOM described above, the VSWR measurement module is a directional coupler.
According to the control method of the AOM, a remote control end sends all working parameters to an MCU through an RS232 interface, the MCU sets the working frequency of a clock generator, a frequency signal passes through an amplifier and then passes through a first mixer again and again after being filtered by a filter, when an external signal is input, the signal is input into a buffer through a TTL interface, the first mixer is driven to enable the frequency signal to pass smoothly, the passed frequency signal enters a second mixer after being amplified by an amplifier, the mixed signal enters an amplifier III after being amplified by an attenuator, and the amplified signal is amplified again by an amplifier IV and then drives the AOM; the attenuation of the attenuator in the signal conversion process is controlled by an external analog signal; the carrier signal output by the amplifier IV is input into the MCU after being measured by the VSWR measuring module; the temperature sensor senses the temperature of the fourth amplifier and feeds the temperature back to the MCU.
Further, in the control method of the AOM, the remote control end sends working parameters of the MCU, including working frequency of a carrier wave, working temperature range and VSWR alarm upper limit value, and the MCU stores parameter values; the filter filters out the high-frequency signals; the first amplifier, the second amplifier, the third amplifier and the fourth amplifier are used for the hierarchical amplification of the carrier wave; the first mixer and the second mixer are used for frequency conversion;
The TTL interface inputs a standard TTL signal and controls the output or the turn-off of the carrier wave; the buffer receives an external TTL input signal, and an output signal of the buffer drives an intermediate frequency end of the first mixer to control on and off of a radio frequency signal; the TTL signal is input into the first mixer, when the TTL signal is high, the first mixer outputs a radio frequency signal, and when the TTL signal is low, the first mixer turns off the radio frequency output;
the analog driving circuit receives an external analog quantity signal and directly drives the attenuator after circuit voltage conversion; the attenuator controls the attenuation of the radio frequency signal by inputting different voltages, controls the intensity of the carrier signal input into the amplifier III, and indirectly controls the energy of the final carrier signal, namely the energy of the carrier radio frequency is controlled by inputting an analog quantity.
Compared with the prior art, the invention has remarkable advantages and beneficial effects, and is specifically embodied in the following aspects:
The invention adopts the combination technology of variable carrier frequency and variable carrier output energy to realize the purposes of cost reduction and easy integration, the carrier energy stability in the carrier frequency interval is high, the VSWR value is less than 1.2, and the carrier energy can be attenuated linearly, thereby meeting the scheme requirements of variable carrier frequency and variable carrier output energy.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1: schematic of the system of the present invention.
The meaning of the reference numerals in the figures is given in the following table:
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, directional terms, order terms, etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the control system of the AOM includes an MCU2, a mixer one 6, a mixer two 9 and an attenuator 10, wherein the remote control end 16 is connected with the MCU2 through an RS232 interface 1, the MCU2 is connected with a clock generator 3, the clock generator 3 is connected with a filter 4, the filter 4 is connected with an amplifier one 5, the amplifier one 5 is connected with the mixer one 6, a ttl interface 18 is connected with a buffer 7, the buffer 7 is connected with the mixer one 6, the mixer one 6 is connected with an amplifier two 8, the amplifier two 8 is connected with the mixer two 9, the mixer two 9 is connected with the attenuator 10, the attenuator 10 is connected with an amplifier three 11, the amplifier three 11 is connected with an amplifier four 12, the amplifier four 12 is connected with a VSWR measurement module 14, the VSWR measurement module 14 is connected with an AOM17, the clock generator 3 is connected with the MCU2, the MCU2 is connected with the amplifier four 12, an analog interface 19 is connected with an analog driving circuit 15, and the analog driving circuit 15 is connected with the attenuator 10; a temperature sensor 13 for detecting the temperature of the fourth amplifier 12 is connected to the MCU 2.
The remote control end 16 sends all working parameters to the MCU2 through the RS232 interface 1, the MCU2 sets the working frequency of the clock generator 3, the frequency signal is filtered by the filter 4 and then passes through the first amplifier 5 and then the first mixer 6, when the external signal is input, the signal is input into the buffer 7 through the TTL interface 18, the first mixer 6 is driven to enable the frequency signal to pass smoothly, the frequency signal after passing through the second amplifier 8 is amplified and then enters the second mixer 9, the signal after mixing passes through the attenuator 10 and then enters the third amplifier 11, and the signal after amplifying is amplified again through the fourth amplifier 12 and then drives the AOM17; the attenuation of the attenuator 10 in the signal conversion process is controlled by an external analog signal; the carrier signal output by the fourth amplifier 12 is measured by the VSWR measuring module 14 and then is input into the MCU 2; the temperature sensor 13 senses the temperature of the fourth amplifier 12 and feeds back to the MCU2.
The analog driving circuit 15 is a voltage follower.
Buffer 7 is a gate level non-inverting chip MC74VHC1G50DFT1G.
The remote control end 16 changes and reads the working frequency of the carrier wave, the carrier wave output power, the VSWR detection alarm and the temperature of the amplifier IV 12 by commands;
the TTL interface 18 inputs a standard TTL signal and controls the output or the turn-off of the carrier wave;
the analog interface 19 controls the magnitude of the carrier output power;
AOM17 is the controlled object; the power module supplies power to the system;
The RS232 interface 1 is used for information exchange between the MCU2 and the remote control end 16;
The MCU (main controller) 2 is an MCU of a model STM32F103ZET6, and the MCU2 is communicated with the remote control end 16 through the RS232 interface 1; the MCU2 communicates with the clock generator 3 to set the working frequency; the MCU2 changes the attenuation coefficient of the attenuator through a digital-analog converter so as to achieve the effect of adjusting the output power of the carrier; according to the value of the VSWR measurement module 14, the fourth amplifier 12 is controlled to protect the control system; the temperature of the fourth amplifier is detected by the temperature sensor 13, and the fourth amplifier is protected.
The clock generator 3 is an ADF4360-8 clock generator with the frequency output range of 65 MHz-400 MHz;
the filter 4 adopts a pi-type chebyshev low-pass filter to filter out high-frequency signals;
The first amplifier 5, the second amplifier 8, the third amplifier 11 and the fourth amplifier 12 are radio frequency operational amplifiers, so that the carrier wave level amplification is realized;
The first mixer 6 and the second mixer 9 are double balanced mixers, which are used for converting frequency and eliminating all even harmonics of the local oscillator signal output by the first amplifier and the radio frequency signal output by the second amplifier;
The buffer 7 receives an external TTL input signal, and the output signal of the buffer 7 drives an intermediate frequency end (IF) of the first mixer 6 to control the on and off of a radio frequency signal;
The attenuator 10 is a model HMC346AMS8GE attenuator, is an absorption type voltage variable attenuator, and controls the attenuation of radio frequency signals by inputting different voltages;
The analog driving circuit 15 receives an external analog signal, and directly drives the attenuator 10 after circuit voltage conversion;
The VSWR measurement module 14 is a directional coupler for measuring the Voltage Standing Wave Ratio (VSWR) of the radio frequency signal, and has the function of protecting the whole control system;
The temperature sensor 13 is used for measuring the temperature of the system and is arranged near the fourth amplifier;
transmitting the working parameters to the MCU (master controller) 2 through the remote control terminal 16; TTL signal input controls the on-off of carrier radio frequency; analog quantity input controls the energy of carrier radio frequency;
The remote control end sends working parameters of the MCU, mainly including working frequency of a carrier wave, working temperature range and VSWR alarm upper limit value, and the MCU stores parameter values;
The TTL signal input acts on the first mixer 6, when the TTL signal is high, the first mixer outputs a radio frequency signal, and when the TTL signal is low, the first mixer turns off the radio frequency output;
The analog input controls the attenuation of the attenuator 10 through the analog driving circuit 15, controls the intensity of the carrier signal input to the third amplifier 11, and indirectly controls the energy of the final carrier signal.
In summary, the invention adopts the combination of variable carrier frequency and variable carrier output energy to achieve the purposes of cost reduction and easy integration, the carrier energy stability in the carrier frequency interval is high, the VSWR value is less than 1.2, and the carrier energy can be attenuated linearly, so as to meet the scheme requirements of variable carrier frequency and variable carrier output energy.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
- An aom control system, characterized by: the remote control end (16) is connected with the MCU (2) through the RS232 interface (1), the MCU (2) is connected with the clock generator (3), the clock generator (3) is connected with the filter (4), the filter (4) is connected with the amplifier I (5), the amplifier I (5) is connected with the mixer I (6), the TTL interface (18) is connected with the buffer (7), the buffer (7) is connected with the mixer I (6), the mixer I (6) is connected with the amplifier II (8), the amplifier II (8) is connected with the mixer II (9), the mixer II (9) is connected with the attenuator (10), the attenuator (10) is connected with the amplifier III (11), the amplifier III (11) is connected with the amplifier IV (12), the amplifier IV (12) is connected with the VSWR measuring module (14), the VSWR measuring module (14) is connected with the AOM (17), the VSWR measuring module (14) is connected with the MCU (2), the MCU (2) is connected with the amplifier IV (12), the analog interface (19) is connected with the analog driving circuit (15), and the analog driving circuit (15) is connected with the attenuator.
- 2. The AOM control system of claim 1, wherein: a temperature sensor (13) for detecting the temperature of the fourth amplifier (12) is connected with the MCU (2).
- 3. The AOM control system of claim 1, wherein: the MCU (2) is an MCU of STM32F103ZET 6.
- 4. The AOM control system of claim 1, wherein: the first amplifier (5), the second amplifier (8), the third amplifier (11) and the fourth amplifier (12) are all radio frequency operational amplifiers.
- 5. The AOM control system of claim 1, wherein: the first mixer (6) and the second mixer (9) are double-balanced mixers.
- 6. The AOM control system of claim 1, wherein: the clock generator (3) is an ADF4360-8 clock generator with the frequency output range of 65 MHz-400 MHz; the filter (4) is a pi-type chebyshev low-pass filter; the attenuator (10) is a model HMC346AMS8GE attenuator.
- 7. The AOM control system of claim 1, wherein: the analog driving circuit (15) is a voltage follower, and the buffer (7) is a gate-level non-inverting chip MC74VHC1G50DFT1G.
- 8. The AOM control system of claim 1, wherein: the VSWR measurement module (14) is a directional coupler.
- 9. A method of AOM control implemented using the AOM control system of claim 1, wherein: the remote control end (16) sends all working parameters to the MCU (2) through the RS232 interface (1), the MCU (2) sets the working frequency of the clock generator (3), the frequency signal is filtered by the filter (4) and then passes through the first amplifier (5) and then the first mixer (6), when the external signal is input, the signal is input into the buffer (7) through the TTL interface (18), the first mixer (6) is driven to enable the frequency signal to pass smoothly, the frequency signal after passing through the second amplifier (8) is amplified and then enters the second mixer (9), the signal after mixing enters the third amplifier (11) through the attenuator (10), and the signal after amplifying is amplified again through the fourth amplifier (12) and then drives the AOM (17); the attenuation of the attenuator (10) in the signal conversion process is controlled by an external analog signal; the carrier signal output by the fourth amplifier (12) is input into the MCU (2) after being measured by the VSWR measuring module (14); the temperature sensor (13) senses the temperature of the fourth amplifier (12) and feeds back the temperature to the MCU (2).
- 10. The control method of an AOM according to claim 9, wherein: the remote control end (16) sends working parameters of the MCU (2) including working frequency of a carrier wave, working temperature range and VSWR alarm upper limit value, and the MCU (2) stores parameter values; a filter (4) filters out the high frequency signal; the first amplifier (5), the second amplifier (8), the third amplifier (11) and the fourth amplifier (12) are used for the hierarchical amplification of the carrier wave; the first mixer (6) and the second mixer (9) are used for frequency conversion;The TTL interface (18) inputs a standard TTL signal and controls the output or the turn-off of the carrier wave; the buffer (7) receives an external TTL input signal, and an output signal of the buffer (7) drives an intermediate frequency end of the first mixer (6) to control on and off of a radio frequency signal; the TTL signal is input into the first mixer (6), when the TTL signal is high, the first mixer (6) outputs a radio frequency signal, and when the TTL signal is low, the first mixer (6) turns off the radio frequency output;an analog driving circuit (15) receives an external analog signal and directly drives the attenuator (10) after circuit voltage conversion; the attenuator (10) controls the attenuation of the radio frequency signal by inputting different voltages, controls the intensity of the carrier signal input into the third amplifier (11), and indirectly controls the energy of the final carrier signal, namely the energy of the carrier radio frequency is controlled by the analog input.
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| US5313658A (en) * | 1989-03-20 | 1994-05-17 | Fujitsu Limited | Transmission power control system in a radio apparatus |
| US5357097A (en) * | 1991-11-25 | 1994-10-18 | Nec Corporation | Method and apparatus for controlling acousto-optic filter |
| CN106773151A (en) * | 2016-12-05 | 2017-05-31 | 中国科学院上海高等研究院 | Acousto-optic modulator drive system |
| CN110764287A (en) * | 2019-11-19 | 2020-02-07 | 中国船舶重工集团公司第七0七研究所 | Acousto-optic frequency shifter driving circuit |
| CN213423634U (en) * | 2020-11-06 | 2021-06-11 | 苏州贝林激光有限公司 | Control system of AOM |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090289666A1 (en) * | 2008-05-22 | 2009-11-26 | John Kump | Direct digital synthesis frequency synthesizer and associated methods |
| US11686957B2 (en) * | 2018-11-30 | 2023-06-27 | Hinds Instruments, Inc. | Synchronous photoelastic modulator driving and detection |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5313658A (en) * | 1989-03-20 | 1994-05-17 | Fujitsu Limited | Transmission power control system in a radio apparatus |
| US5357097A (en) * | 1991-11-25 | 1994-10-18 | Nec Corporation | Method and apparatus for controlling acousto-optic filter |
| CN106773151A (en) * | 2016-12-05 | 2017-05-31 | 中国科学院上海高等研究院 | Acousto-optic modulator drive system |
| CN110764287A (en) * | 2019-11-19 | 2020-02-07 | 中国船舶重工集团公司第七0七研究所 | Acousto-optic frequency shifter driving circuit |
| CN213423634U (en) * | 2020-11-06 | 2021-06-11 | 苏州贝林激光有限公司 | Control system of AOM |
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