CN112230450A - AOM control system and control method thereof - Google Patents
AOM control system and control method thereof Download PDFInfo
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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 (automated optical storage module), wherein a remote control end is connected with an MCU (microprogrammed control unit) 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 a first amplifier, the first amplifier is connected with a first mixer, a TTL (transistor-transistor logic) interface is connected with a buffer, the buffer is connected with the first mixer, the first mixer is connected with a second amplifier, the second amplifier is connected with a second mixer, the second mixer is connected with an attenuator, the attenuator is connected with a third amplifier, the third amplifier is connected with a fourth amplifier, the fourth amplifier is connected with a VSWR (voltage-dependent wave) measuring module, the VSWR measuring module is connected with the AOM. The combined technology of variable carrier frequency and variable carrier output energy is adopted to achieve the purposes of cost reduction and easy integration, and the carrier frequency interval uploading energy is high in stability.
Description
Technical Field
The invention relates to an AOM control system and a control method thereof.
Background
AOMs (Acousto-optical Modulators), i.e. Acousto-optic Modulators, are composed of an Acousto-optic medium and a piezoelectric transducer. When the transducer is driven by a certain specific carrier frequency of a driving source, the transducer can generate ultrasonic waves with the same frequency and transmit the ultrasonic waves into an acousto-optic medium, the refractive index of the acousto-optic medium changes 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 wave controls the diffraction efficiency. Therefore, controlling the frequency of the carrier and the energy of the carrier is a very important link in the control system of the AOM.
At present, the AOM control system mostly adopts fixed carrier frequency and fixed carrier output power, and a plurality of types of AOM control systems are needed for lasers using a plurality of types of AOMs, so that the cost is high, integration is difficult, and limitation is very obvious.
Therefore, it is very important to design an AOM control system with low cost, adjustable carrier frequency, and stable and reliable performance according to actual requirements.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an AOM control system and a control method thereof.
The purpose of the invention is realized by the following technical scheme:
the control system of the AOM is characterized in that: contain MCU, first mixer, second mixer and attenuator, the remote control end passes through RS232 interface connection MCU, MCU connects clock generator, clock generator connects the wave filter, the amplifier is connected to the wave filter, amplifier one connects first mixer, TTL interface connection buffer, first mixer is connected to the amplifier two, second mixer is connected to the amplifier, the attenuator is connected to the second mixer, amplifier three connects amplifier four, VSWR measuring module is connected to amplifier four, VSWR measuring module links to each other with AOM, VSWR measuring module inserts MCU, MCU and amplifier four are connected, analog quantity interface connection simulation drive circuit, simulation drive circuit links to each other 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, the control system of the AOM is described above, wherein 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, in the control system of the AOM, the clock generator is a model ADF4360-8 clock generator, and the frequency output range is 65 MHz-400 MHz; the filter is a pi-type Chebyshev low-pass filter; the faders are model HMC346AMS8GE faders.
Further, in the control system of the AOM, the analog driving circuit is a voltage follower, and the buffer is a gate-level non-inverting chip MC74VHC1G50DFT 1G.
Further, the control system of AOM described above, wherein the VSWR measurement module is a directional coupler.
The control method of the AOM comprises the steps that 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, frequency signals are filtered by a filter and then pass through an amplifier and a first mixer again, when external signals are input, the signals are input into a buffer through a TTL interface, the first mixer is driven to enable the frequency signals to pass through smoothly, the passed frequency signals are amplified by a second amplifier and then enter a second mixer, the mixed signals pass through an attenuator and then enter a third amplifier, and the amplified signals pass through a fourth amplifier and are amplified again and then drive 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 measured by the VSWR measuring module and then input into the MCU; the temperature sensor senses the temperature of the amplifier IV and feeds the temperature back to the MCU.
Furthermore, in the control method of the AOM, the remote control end sends the MCU working parameters including the working frequency of the carrier, the working temperature range, and the VSWR alarm upper limit value, and the MCU stores the parameter values; the filter filters out high-frequency signals; the first amplifier, the second amplifier, the third amplifier and the fourth amplifier are used for carrier level amplification; 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 a carrier; 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 radio frequency output of the first mixer is switched off;
the analog driving circuit receives an external analog quantity signal, and directly drives the attenuator after circuit voltage conversion; the attenuator controls the attenuation amount of the radio frequency signal by inputting different voltages, controls the intensity of the carrier signal input to 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 analog quantity.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and is embodied in the following aspects:
the invention adopts the technology of combining the variable carrier frequency and the variable carrier output energy to realize the purposes of cost reduction and easy integration, the stability of the carrier energy loaded in the carrier frequency interval is high, the VSWR value is less than 1.2, and simultaneously the carrier energy can be linearly attenuated, thereby meeting the scheme requirements of the variable carrier frequency and the 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 obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will 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 needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1: schematic representation of the system of the present invention.
The meanings of the reference symbols in the figures are given in the following table:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the directional terms and the sequence 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 MCU2, mixer one 6, the remote control end 16 is connected with the MCU2 through an RS232 interface 1, the MCU2 is connected with the clock generator 3, the clock generator 3 is connected with the filter 4, the filter 4 is connected with the first amplifier 5, the first amplifier 5 is connected with the first mixer 6, the TTL interface 18 is connected with the buffer 7, the buffer 7 is connected with the first mixer 6, the first mixer 6 is connected with the second amplifier 8, the second amplifier 8 is connected with the second mixer 9, the second mixer 9 is connected with the attenuator 10, the attenuator 10 is connected with the third amplifier 11, the third amplifier 11 is connected with the fourth amplifier 12, the fourth amplifier 12 is connected with the VSWR measuring module 14, the VSWR measuring module 14 is connected with the AOM17, the VSWR measuring module 14 is connected into the MCU2, the MCU2 is connected with the fourth amplifier 12, the analog quantity interface 19 is connected with the analog driving circuit 15, and the analog driving circuit 15 is connected with; a temperature sensor 13 for sensing the temperature of the amplifier four 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 amplifier I5 and then the mixer I6, when an external signal is input, the signal is input into the buffer 7 through the TTL interface 18, the mixer I6 is driven to enable the frequency signal to pass through smoothly, the passed frequency signal is amplified by the amplifier II 8 and then enters the mixer II 9, the mixed signal passes through the attenuator 10 and then enters the amplifier III 11, and the amplified signal is amplified again by the amplifier IV 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 amplifier IV 12 is measured by the VSWR measuring module 14 and then input into the MCU 2; the temperature sensor 13 senses the temperature of the amplifier four 12 and feeds back to the MCU 2.
The analog driving circuit 15 is a voltage follower.
The buffer 7 is a gate-level non-inverting chip MC74VHC1G50DFT 1G.
The remote control end 16 changes and reads the working frequency of the carrier, the carrier output power, the VSWR detection alarm and the temperature of the amplifier IV 12 through commands;
the TTL interface 18 inputs a standard TTL signal and controls the output or the turn-off of a carrier;
the analog quantity 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 terminal 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 an RS232 interface 1; the MCU2 is communicated with the clock generator 3 to set the working frequency; the MCU2 changes the attenuation coefficient of the attenuator through the digital-to-analog converter to achieve the effect of adjusting the carrier output power; controlling an amplifier IV 12 according to the value of the VSWR measuring module 14 to protect a control system; the temperature sensor 13 detects the temperature of the fourth amplifier, thereby protecting the fourth amplifier.
The clock generator 3 is a model ADF4360-8 clock generator, and the frequency output range is 65 MHz-400 MHz;
the filter 4 adopts a pi-type Chebyshev low-pass filter to filter high-frequency signals;
the first amplifier 5, the second amplifier 8, the third amplifier 11 and the fourth amplifier 12 are all radio frequency operational amplifiers, and carrier level amplification is achieved;
the first mixer 6 and the second mixer 9 both adopt double-balanced mixers, and the double-balanced mixers have the function of frequency conversion and can eliminate all even harmonics of a local oscillation signal output by the first amplifier and a radio frequency signal output by the first amplifier;
the buffer 7 receives an external TTL input signal, and an output signal of the buffer 7 drives an Intermediate Frequency (IF) end of the first mixer 6 to control 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 amount of radio frequency signals by inputting different voltages;
the analog driving circuit 15 receives an external analog quantity signal, and directly drives the attenuator 10 after circuit voltage conversion;
the VSWR measurement module 14 is a directional coupler that measures a Voltage Standing Wave Ratio (VSWR) of the radio frequency signal, and has an effect of protecting the entire control system;
the temperature sensor 13 is used for measuring the temperature of the system and is arranged near the fourth amplifier;
sending working parameters to an MCU (main controller) 2 through a remote control terminal 16; TTL signal input controls the on-off of carrier radio frequency; analog quantity input controls the energy of carrier wave radio frequency;
the remote control end sends working parameters of the MCU, wherein the working parameters mainly comprise the working frequency of a carrier, the working temperature range and the VSWR alarm upper limit value, and the MCU stores the parameter values;
the TTL signal input acts on the first mixer 6, when the TTL signal is high, the first mixer radio frequency signal is output, and when the TTL signal is low, the first mixer radio frequency output is turned off;
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 amplifier three 11, and indirectly controls the energy of the final carrier signal.
In conclusion, the invention adopts the combination of the variable carrier frequency and the variable carrier output energy to realize the purposes of cost reduction and easy integration, the stability of the carrier energy loaded in the carrier frequency interval is high, the VSWR value is less than 1.2, and simultaneously the carrier energy can be linearly attenuated, thereby meeting the scheme requirements of the variable carrier frequency and the variable carrier output energy.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement 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 numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and shall be covered by the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
- An AOM control system, characterized by: comprises a MCU (2), a first mixer (6), a second mixer (9) and an attenuator (10), a remote control end (16) is connected with the MCU (2) through an RS232 interface (1), the MCU (2) is connected with a clock generator (3), the clock generator (3) is connected with a filter (4), the filter (4) is connected with a first amplifier (5), the first amplifier (5) is connected with the first mixer (6), a TTL interface (18) is connected with a buffer (7), the buffer (7) is connected with the first mixer (6), the first mixer (6) is connected with a second amplifier (8), the second amplifier (8) is connected with the second mixer (9), the second mixer (9) is connected with the attenuator (10), the attenuator (10) is connected with a third amplifier (11), the third amplifier (11) is connected with a fourth amplifier (12), the fourth amplifier (12) is connected with a VSWR measuring module (14), and the VSWR measuring module (14) is connected with an AOM (17, the VSWR measuring module (14) is connected to the MCU (2), the MCU (2) is connected with the amplifier IV (12), the analog quantity interface (19) is connected with the analog driving circuit (15), and the analog driving circuit (15) is connected with the attenuator (10).
- 2. The AOM control system of claim 1, wherein: and a temperature sensor (13) for detecting the temperature of the amplifier IV (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 a model ADF4360-8 clock generator, and the frequency output range is 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 MC74VHC1G50DFT 1G.
- 8. The AOM control system of claim 1, wherein: the VSWR measurement module (14) is a directional coupler.
- 9. A control method for implementing AOM using the system of claim 1, characterized by: 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), frequency signals are filtered by the filter (4) and then pass through the amplifier I (5) and the mixer I (6), when external signals are input, the signals are input into the buffer (7) through the TTL interface (18), the mixer I (6) is driven to enable the frequency signals to pass smoothly, the passed frequency signals are amplified by the amplifier II (8) and then enter the mixer II (9), the mixed signals pass through the attenuator (10) and then enter the amplifier III (11), and the amplified signals pass through the amplifier IV (12) and are amplified again and then drive 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 amplifier IV (12) is measured by the VSWR measuring module (14) and then input into the MCU (2); the temperature sensor (13) senses the temperature of the amplifier IV (12) and feeds the temperature back to the MCU (2).
- 10. The AOM control method according to claim 9, wherein: the remote control end (16) sends working parameters including the working frequency, the working temperature range and the VSWR alarm upper limit value of the carrier to the MCU (2), and the MCU (2) stores the parameter values; the filter (4) filters out high-frequency signals; the first amplifier (5), the second amplifier (8), the third amplifier (11) and the fourth amplifier (12) are used for hierarchical amplification of a carrier; 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 a carrier wave; a buffer (7) receives an external TTL input signal, and an output signal of the buffer (7) drives an intermediate frequency end of a first mixer (6) to control on and off of a radio frequency signal; the TTL signal is input into a first mixer (6), when the TTL signal is high, the radio frequency signal of the first mixer (6) is output, and when the TTL signal is low, the radio frequency output of the first mixer (6) is switched off;the analog driving circuit (15) receives an external analog quantity 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 to the amplifier III (11), and indirectly controls the energy of the final carrier signal, namely the energy of the carrier radio frequency is controlled by analog quantity 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 |
| US20090289666A1 (en) * | 2008-05-22 | 2009-11-26 | John Kump | Direct digital synthesis frequency synthesizer and associated methods |
| 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 |
| US20200174289A1 (en) * | 2018-11-30 | 2020-06-04 | Hinds Instruments, Inc. | Synchronous photoelastic modulator driving and detection |
| CN213423634U (en) * | 2020-11-06 | 2021-06-11 | 苏州贝林激光有限公司 | Control system of AOM |
-
2020
- 2020-11-06 CN CN202011230223.9A patent/CN112230450B/en active Active
Patent Citations (7)
| 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 |
| US20090289666A1 (en) * | 2008-05-22 | 2009-11-26 | John Kump | Direct digital synthesis frequency synthesizer and associated methods |
| 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 |
| US20200174289A1 (en) * | 2018-11-30 | 2020-06-04 | Hinds Instruments, Inc. | Synchronous photoelastic modulator driving and detection |
| 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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