CN209570268U - Fourier transformation infrared spectrometer index glass scan control module based on FPGA - Google Patents
Fourier transformation infrared spectrometer index glass scan control module based on FPGA Download PDFInfo
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- CN209570268U CN209570268U CN201822237918.4U CN201822237918U CN209570268U CN 209570268 U CN209570268 U CN 209570268U CN 201822237918 U CN201822237918 U CN 201822237918U CN 209570268 U CN209570268 U CN 209570268U
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Abstract
The Fourier transformation infrared spectrometer index glass scan control module based on FPGA that the utility model relates to a kind of, including laser detector and signal transformation circuit, frequency-voltage conversion circuit, subtracter, analog pid circuit, electronic switch II, control line II, FPGA, D/A conversion circuit, initial force circuit, electronic switch I, direction controlable electric current, control line I, control line III, photoelectric coupled circuit, power amplifier, voice coil motor；The utility model can meet requirement of the technical indicator to speed by the adjustment to potentiometer in frequency-voltage conversion circuit, fine-tuning index glass scanning speed in this way.FPGA itself has many other functions in circuit design, in addition the control to index glass, is made full use of to FPGA, alleviates the burden of master cpu, solves the competition between the wasting of resources and each function of CPU, keeps system operation relatively reliable, efficiently.The dual utilization of frequency-voltage conversion circuit and analog pid circuit, so that index glass scanning is more steady, reliable, uniform.
Description
Technical field
The utility model belongs to spectrometric instrument technical field, and it is dynamic to be related to a kind of Fourier transformation infrared spectrometer inside
Scarnning mirror control module.
Background technique
The core of Fourier transformation infrared spectrometer is interferometer, and interferometer mostly uses greatly traditional Michelson dry at present
Interferometer or its deformation, interferometer inside mainly include beam splitter, index glass and horizontal glass, and laser and infrared beam are each inside interferometer
Self-forming interference, the movement of index glass cause the variation of the optical path difference of coherent beam, in turn result in the interference letter that detector detects
Number variation, uniformity, stability, the scanning speed trimmability of index glass movement velocity directly influence the technical of interferometer
It can index.
Currently, most of new-type Michelson's interferometers mostly use cpu chip that grating encoder is added to add simulation control of PID
Device or CPU are to control drive module that the Digital PID Controller of chip is scanned as index glass to drive voice coil type direct current generator,
If being individually a kind of wasting of resources with cpu chip control module, can be made if CPU is also used to other controls and data processing
At the competition between each function, the unstability of instrument is caused.
English abbreviation involved in the application is explained as follows:
1, FPGA: field programmable gate array
2, PID control: proportional integral differential control
3, D/A is converted: digital quantity being converted to the process of analog quantity
4, CPU: central processing unit
Utility model content
Index glass movement velocity uniformity, the stability of present most of new-type Michelson's interferometers are substantially attained by
Design requirement, but it is competing between each function of the wasting of resources and CPU of being mentioned in scanning speed non-differentiability tonality and background technique
The problem of striving still remains.
In order to solve these problems, a kind of Fourier transformation infrared spectrometer index glass scanning based on FPGA of utility model
Control module.
To achieve the above objectives, the technical scheme adopted by the utility model is that:
A kind of Fourier transformation infrared spectrometer index glass scan control module based on FPGA, including laser detector and letter
Number shaping circuit 1, frequency-voltage conversion circuit 2, subtracter 3, analog pid circuit 4, electronic switch II 5, control line II 6, FPGA7,
D/A conversion circuit 8, initial force circuit 9, electronic switch I 10, direction controlable electric current 11, control line I 12, control line III 13, optocoupler
Circuit 14, power amplifier 15, voice coil motor 16；
The FPGA7 is connect by control line I 12 with electronic switch I 10；The FPGA7 passes through control line II 6 and electronics
Switch II 5 connects；The FPGA7 is connect by control line III 13 with direction controlable electric current 11, the FPGA7 and D/A conversion electricity
Road 8 connects, and the D/A conversion circuit 8 is connect with subtracter 3, and the D/A conversion circuit 8 is also connect with initial force circuit 9, institute
It states initial force circuit 9 to connect with electronic switch I 10, the electronic switch I 10 is connect with direction controlable electric current 11；
The laser detector and signal transformation circuit 1 are connect with FPGA7, the laser detector and signal transformation circuit
1 also connect with frequency-voltage conversion circuit 2, and the frequency-voltage conversion circuit 2 is connect with subtracter 3, the subtracter 3 and analog pid electricity
Road 4 connects, and the analog pid circuit 4 is connect with electronic switch II 5, and the electronic switch II 5 connects with direction controlable electric current 11
It connects；
The direction controlable electric current 11 is connect with power amplifier 15, and the power amplifier 15 is connect with voice coil motor 16, institute
It states and is fixed with index glass on voice coil motor 16；
The photoelectric coupled circuit 14 is connect with FPGA7；
The laser detector and signal transformation circuit 1 include: the electronics such as photodiode, operational amplifier, gate circuit
Element；It exports for square wave to be detected, amplified, is shaped as to laser interference signal, and by square wave to 2 He of frequency-voltage conversion circuit
FPGA7；The frequency-voltage conversion circuit 2 includes: frequency pressure conversion chip LM331, potentiometer I and Resistor-Capacitor Unit；For receiving laser
The square wave that detector and signal transformation circuit 1 export, and square wave is subjected to frequency pressure and is converted, voltage is converted to, is scanned as index glass
The feedback signal of control module, connect in frequency-voltage conversion circuit 2 chip LM331 pressed with reference to the adjustable frequency of potentiometer I of end feet it is defeated
Ratio out；
The FPGA7 is used to control the operation of the index glass scan control module；The FPGA7 receives laser detector
And the square wave that signal transformation circuit 1 exports, the counter in FPGA7 are used to record the scanning distance of index glass and sweeping for monitoring index glass
Retouch speed；The FPGA7 is also used to export starting force numerical data to D/A conversion circuit 8；The D/A conversion circuit 8 is used for
Starting force numerical data is converted to starting force analog signal, output to starting by the starting force numerical data for receiving FPGA7 output
Power circuit 9, the initial force circuit 9 includes: operational amplifier；For starting force analog signal to be amplified, and will amplification
Starting force analog signal afterwards is transmitted to direction controlable electric current 11 by electronic switch I 10；
The FPGA7 is also used to export fixed speed digital's data to D/A conversion circuit 8；The D/A conversion circuit 8 is for connecing
Fixed speed digital's data are converted at the uniform velocity analog signal, output to subtracter 3 by the fixed speed digital's data for receiving FPGA7 output；
The subtracter 3 includes: operational amplifier and resistance；At the uniform velocity simulation for will be converted out through D/A conversion circuit 8
It is poor that signal and the voltage after the conversion of frequency-voltage conversion circuit 2 are made；
The analog pid circuit 4 includes: operational amplifier, potentiometer II, potentiometer III, potentiometer IV and Resistor-Capacitor Unit；
Pid parameter is adjusted in potentiometer II, potentiometer III, potentiometer IV, so that the scanning of index glass is more uniform, it is more stable, resist dry
It is stronger to disturb ability, direction controlable electric current 11 is transmitted to by electronic switch II 5；
The direction controlable electric current 11 includes: electronic switch III and operational amplifier；It is described for controlling electric signal direction
Power amplifier 15 includes: power amplifier element and Resistor-Capacitor Unit；For driving voice coil motor 16；The voice coil motor 16 is for receiving function
The control signal that electric discharge road 15 exports, does linear reciprocating motion according to current direction and size；
The photoelectric coupled circuit 14 includes: optic coupling element and resistive element, and the photoelectric coupled circuit 14 believes the start bit of generation
Number FPGA7 is transmitted to as positioning signal.
The chip of the electronic switch I 10 and electronic switch II 5 is ADG433, and the chip of the FPGA7 is XC6SLX9.
When scanning beginning, the FPGA7 provides starting force numerical data and exports to D/A conversion circuit conversion 8, institute
D/A conversion circuit 8 is stated starting force numerical data is converted to starting force analog signal and is transmitted to initial force circuit 9, it is described
FPGA7 controls electronic switch I 10 by control line I 12 and opens, and the FPGA7 controls electronic switch II 5 by control line II 6
It closes, the FPGA7 controls the electronic switch III in direction controlable electric current 11 by control line III 13 and opens, the starting force mould
Quasi- signal is controlled by initial force circuit 9, the output of electronic switch I 10 to direction controlable electric current 11, the direction controlable electric current 11
Electric signal direction and by electric signal transmission to power amplifier 15, the power amplifier 15 drives voice coil motor 16 after receiving electric signal
Movement, the voice coil motor 16 drive index glass acceleration to travel forward.
The laser interference square-wave signal that the laser detector and signal transformation circuit 1 detect is input to FPGA7,
FPGA7 measures the period of laser interference square-wave signal, is converted into frequency by its internal counter, when itself and setting speed
When degree frequency values are equal, that is, reach setting speed；When the index glass accelerates to setting speed, the FPGA7 exports fixed speed digital
Data are to D/A conversion circuit 8；The D/A conversion circuit 8 receives fixed speed digital's data of FPGA7 output, by fixed speed digital's data
Be converted at the uniform velocity analog signal, output to subtracter 3；The laser detector and signal transformation circuit 1 are to laser interference signal
It detected, amplified, being shaped as square wave, and square wave is exported to frequency-voltage conversion circuit 2 and square wave is subjected to frequency pressure conversion, it will be square
Wave is converted to voltage and exports to subtracter 3, and the subtracter 3 will at the uniform velocity analog signal and after the conversion of frequency-voltage conversion circuit 2
Voltage make the difference, by control line I 12 control electronic switch I 10 close, control line II 6 control electronic switch II 5 open, simulation
PID circuit 4 works, and the direction controlable electric current 11 controls electric signal direction and by electric signal transmission to power amplifier 15, described
Driving voice coil motor 16 moves after power amplifier 15 receives electric signal, and the voice coil motor 16 drives index glass uniform forward motion.
The laser interference square-wave signal that the laser detector and signal transformation circuit 1 detect, is input to FPGA7,
FPGA7 measures laser interference square-wave signal quantity by its internal counter, when it is equal with setting square wave number, i.e.,
Reach set distance.When the index glass uniform motion is to set distance, electronic switch I 10 is controlled by control line I 12 and is opened, control
Line II 6 processed controls electronic switch II 5 and closes, and control line III 13 controls the electronic switch III in direction controlable electric current 11 and closes, institute
It states direction controlable electric current 11 and controls electric signal direction and by electric signal transmission to power amplifier 15, the power amplifier 15 receives electricity
For driving voice coil motor 16 to move after signal, the voice coil motor 16 drives index glass to return backward.
When index glass returns to initial position, the return signal of generation is transmitted to FPGA7, is determined by FPGA7 by photoelectric coupled circuit 14
Whether start new round scanning, or stops scanning.
The beneficial effects of the utility model are:
1, by the adjustment to potentiometer in frequency-voltage conversion circuit, fine-tuning index glass scanning speed can meet technology in this way
Requirement of the index to speed.
2, FPGA itself has many other functions in circuit design, in addition the control to index glass, is to the abundant of FPGA
It utilizes, alleviates the burden of master cpu, solve the competition between the wasting of resources and each function of CPU, system operation is made more may be used
It leans on, efficiently.
3, the dual utilization of frequency-voltage conversion circuit and analog pid circuit, so that index glass scanning is more steady, reliable, uniform.
Detailed description of the invention
The utility model has following attached drawing:
The structural block diagram of Fig. 1 the utility model.
Appended drawing reference
1, laser detector and signal transformation circuit
2, frequency-voltage conversion circuit
3, subtracter
4, analog pid circuit
5, electronic switch II
6, control line II
7、FPGA
8, D/A conversion circuit
9, initial force circuit
10, electronic switch I
11, direction controlable electric current
12, control line I
13, control line III
14, photoelectric coupled circuit
15, power amplifier
16, voice coil motor
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of Fourier transformation infrared spectrometer index glass scanning based on FPGA described in the utility model
Control module, including laser detector and signal transformation circuit 1, frequency-voltage conversion circuit 2, subtracter 3, analog pid circuit 4, electricity
Sub switch II 5, control line II 6, FPGA7, D/A conversion circuit 8, initial force circuit 9, electronic switch I 10, direction controlable electric current
11, control line I 12, control line III 13, photoelectric coupled circuit 14, power amplifier 15, voice coil motor 16；
The FPGA7 is as control core, by external D/A conversion circuit 8, provides starting force for index glass and for each
Kind scanning speed overcomes the power of resistance, turns so that index glass realizes acceleration in setting in motion and realizes to slow down after scanning through whole process
To, and in effective pickup area realization uniform motion.
A kind of Fourier transformation infrared spectrometer index glass scan control module based on FPGA, when scanning beginning,
FPGA7 provides a series of starting force numerical datas, converts 8 by D/A conversion circuit as analog signal, is controlled by control line I 12
Electronic switch I 10 is opened, and control line II 6 controls electronic switch II 5 and closes, and control line III 13 controls direction controlable electric current 11, is made
Forward, voice coil motor 16 is displaced forward with index glass for scanning direction.
The start bit signal of generation is transmitted to FPGA7 as positioning signal by photoelectric coupled circuit 14.
When index glass is accelerated to setting speed, electronic switch I 10 is controlled by control line I 12 and is closed, control line II 6 is controlled
Electronic switch II 5 processed is opened, and analog pid circuit 4 works, and makes index glass uniform motion.
Laser detector and signal transformation circuit 1, which amplify laser interference signal, is shaped as square wave, enters in FPGA7 all the way
Counter, for record index glass scanning distance.Another way enters frequency-voltage conversion circuit 2, and frequency-voltage conversion circuit 2 is by square wave
Signal is converted to voltage output to subtracter 3, and the subtracter 3 is used for the voltage and FPGA7 for exporting frequency-voltage conversion circuit 2
The voltage value of the holding index glass uniform motion provided makes the difference, in this way when index glass movement velocity is uneven, the voltage change of generation,
It is adjusted in time.
When the scanning distance of the counter records in FPGA7 reaches predetermined value, electronic switch I is controlled by control line I 12
10 open, and control line II 6 controls electronic switch II and closes, and control line III controls direction controlable electric current 11, make scanning direction backward,
Voice coil motor 16 returns backward with index glass.
When index glass is accelerated to setting speed, electronic switch I 10 is controlled by control line I 12 and is closed, control line II 6 is controlled
Electronic switch II 5 processed is opened, and analog pid circuit 4 works, and makes index glass uniform motion.
When index glass returns to initial position, the return signal of generation is transmitted to FPGA7, is determined by FPGA7 by photoelectric coupled circuit 14
Whether start new round scanning, or stops scanning.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of Fourier transformation infrared spectrometer index glass scan control module based on FPGA, which is characterized in that including laser
Detector and signal transformation circuit (1), frequency-voltage conversion circuit (2), subtracter (3), analog pid circuit (4), electronic switch II
(5), control line II (6), FPGA (7), D/A conversion circuit (8), initial force circuit (9), electronic switch I (10), direction controllable electric
Road (11), control line I (12), control line III (13), photoelectric coupled circuit (14), power amplifier (15), voice coil motor (16)；
The FPGA (7) is connect by control line I (12) with electronic switch I (10)；The FPGA (7) passes through control line II (6)
It is connect with electronic switch II (5)；The FPGA (7) is connect by control line III (13) with direction controlable electric current (11), described
FPGA (7) is connect with D/A conversion circuit (8), and the D/A conversion circuit (8) connect with subtracter (3), the D/A conversion circuit
(8) it is also connect with initial force circuit (9), the initial force circuit (9) connect with electronic switch I (10), the electronic switch I
(10) it is connect with direction controlable electric current (11)；
The laser detector and signal transformation circuit (1) are connect with FPGA (7), the laser detector and signal transformation circuit
(1) also connect with frequency-voltage conversion circuit (2), the frequency-voltage conversion circuit (2) connect with subtracter (3), the subtracter (3) with
Analog pid circuit (4) connection, the analog pid circuit (4) connect with electronic switch II (5), the electronic switch II (5) and
Direction controlable electric current (11) connection；
The direction controlable electric current (11) connect with power amplifier (15), and the power amplifier (15) and voice coil motor (16) are even
It connects, is fixed with index glass on the voice coil motor (16)；
The photoelectric coupled circuit (14) connect with FPGA (7).
2. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as described in claim 1, feature
It is, the laser detector and signal transformation circuit (1) include: photodiode, operational amplifier, gate circuit electronics member
Part；For being detected, being amplified, being shaped as square wave to laser interference signal, and square wave exported to frequency-voltage conversion circuit (2) and
FPGA(7)。
3. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as claimed in claim 2, feature
It is, the frequency-voltage conversion circuit (2) includes: frequency pressure conversion chip LM331, potentiometer I and Resistor-Capacitor Unit；For receiving laser
Detector and the square wave of signal transformation circuit (1) output, and square wave is subjected to frequency pressure and is converted, voltage is converted to, is swept as index glass
The feedback signal for retouching control module meets the chip LM331 in frequency-voltage conversion circuit (2) and is used to adjust with reference to the potentiometer I of end feet
Frequency pressure export ratio.
4. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as claimed in claim 2, feature
It is, the FPGA (7) is used to control the operation of the index glass scan control module；The FPGA (7) receives laser detector
And the square wave of signal transformation circuit (1) output, the counter in FPGA (7) are used to record the scanning distance and monitoring index glass of index glass
Scanning speed；The FPGA (7) is also used to export starting force numerical data to D/A conversion circuit (8)；The D/A conversion electricity
Road (8) is used to receive the starting force numerical data of FPGA (7) output, and starting force numerical data is converted to starting force simulation letter
Number, it exports to initial force circuit (9), the initial force circuit (9) includes: operational amplifier；For by starting force analog signal
It amplifies, and amplified starting force analog signal is transmitted to direction controlable electric current (11) by electronic switch I (10).
5. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as claimed in claim 3, feature
It is, the FPGA (7) is also used to export fixed speed digital's data to D/A conversion circuit (8)；The D/A conversion circuit (8) is used for
Fixed speed digital's data are converted at the uniform velocity analog signal, output to subtracter by the fixed speed digital's data for receiving FPGA (7) output
(3)。
6. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as claimed in claim 5, feature
It is, the subtracter (3) includes: operational amplifier and resistance；At the uniform velocity mould for will be converted out through D/A conversion circuit (8)
It is poor that quasi- signal and the voltage after frequency-voltage conversion circuit (2) conversion are made.
7. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as claimed in claim 6, feature
It is, the analog pid circuit (4) includes: operational amplifier, potentiometer II, potentiometer III, potentiometer IV and Resistor-Capacitor Unit；
Potentiometer II, potentiometer III, potentiometer IV are used for pid regulator parameters, are transmitted to direction controlable electric current by electronic switch II (5)
(11)。
8. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as described in claim 4 or 7, special
Sign is that the direction controlable electric current (11) includes: electronic switch III and operational amplifier；For controlling electric signal direction, institute
Stating power amplifier (15) includes: power amplifier element and Resistor-Capacitor Unit；For driving voice coil motor (16)；The voice coil motor (16) is used
In the control signal for receiving power amplifier (15) output, linear reciprocating motion is done according to current direction and size.
9. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as described in claim 1, feature
It is, the photoelectric coupled circuit (14) includes: optic coupling element and resistive element, and the photoelectric coupled circuit (14) believes the start bit of generation
FPGA (7) number are transmitted to as positioning signal.
10. the Fourier transformation infrared spectrometer index glass scan control module based on FPGA as described in claim 1, feature
It is, the chip of the electronic switch I (10) and electronic switch II (5) is ADG433, and the chip of the FPGA (7) is
XC6SLX9。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822237918.4U CN209570268U (en) | 2018-12-28 | 2018-12-28 | Fourier transformation infrared spectrometer index glass scan control module based on FPGA |
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|---|---|---|---|
| CN201822237918.4U CN209570268U (en) | 2018-12-28 | 2018-12-28 | Fourier transformation infrared spectrometer index glass scan control module based on FPGA |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696244A (en) * | 2018-12-28 | 2019-04-30 | 北京北分瑞利分析仪器(集团)有限责任公司 | A kind of Fourier transformation infrared spectrometer index glass scan control module based on FPGA |
-
2018
- 2018-12-28 CN CN201822237918.4U patent/CN209570268U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696244A (en) * | 2018-12-28 | 2019-04-30 | 北京北分瑞利分析仪器(集团)有限责任公司 | A kind of Fourier transformation infrared spectrometer index glass scan control module based on FPGA |
| CN109696244B (en) * | 2018-12-28 | 2023-11-07 | 北京北分瑞利分析仪器(集团)有限责任公司 | Fourier transform infrared spectrometer moving mirror scanning control module based on FPGA |
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