CN109827926A - A kind of terahertz wave spectrometer control system and observation method - Google Patents
A kind of terahertz wave spectrometer control system and observation method Download PDFInfo
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Abstract
The present invention provides a kind of terahertz wave spectrometer control systems and and observation calibration method.The terahertz wave spectrometer control system includes: FFTS digital spectrometer, front-end control unit, outdoor control unit, control unit and the optical path modulation unit in cabin for controlling computer and connecting respectively with the control computer；The FFTS digital spectrometer is used to handle the IF output signal of atmosphere receiver system, and then the frequency spectrum data of generation is saved in the network storage of whole system；The front-end control unit is used for centralized control terahertz wave spectrometer receiver front end equipment；The outdoor control unit is used for the rotation of control system antenna；Control unit for adjusting the temperature in receiver device cabin in real time in the cabin；Stepper motor straight line of the optical path modulation unit for before controlling spectrometer reception window travels at the uniform speed, to reach the method for eliminating standing wave in observation frequency spectrum.The present invention also provides a kind of observation methods based on the terahertz wave spectrometer control system.
Description
Technical field
The present invention relates to a kind of terahertz wave spectrometer control system and observation methods.
Background technique
Terahertz wave spectrometer mainly in atmosphere ozone molecule spectral line and steam continuous spectrum carry out duration observation
One scientific equipment, the equipment mainly include 4 core components: quasi-optics receives and signal calibration part, signal are visited
It surveys and amplifier section, back end signal handles part and systems control division point in real time.In addition to this, it is necessary to be provided with low temperature environment
Refrigerator appliance and indoor environmental condition control part etc..
Quasi-optics and signal calibration part: providing room temperature and high temperature terahertz signal calibration source, is accurate alignment atmosphere
The intensity of middle molecular spectrum and continuous spectrum needs to need to switch observed object (room temperature calibration source, high temperature school according to observation process
Quasi- source, atmospheric signal), Tipping switching device is thus provided, by the position of control Tipping rotation, so that observation is not
Same target.In addition to this, by Beam Splitter Optical devices, observation signal is divided into two-way and is received, improve observation effect
Rate provides help for the molecular constituents in more detailed understanding atmosphere.In addition, better signal strength in order to obtain, will believe
Number source and observation signal are interfered, and to obtain more preferable interference signal, need to adjust the phase of observation signal so that signal source and
Observation signal phase is identical, i.e., interference strength is most strong (eliminating standing wave).Specific method is to pass through 90 degree of phasings of linear movement
Device.
Signal detection and amplifier section: mainly containing the SIS detector of 0.3THz and 0.5THz, visits usually using SIS
Surveying device becomes low frequency signal for observation high-frequency signal as frequency mixer and then amplifies, but in this scheme, received atmosphere
Radiation signal and LO local oscillator (YIG+ frequency multiplier) output signal obtain lower frequency by the progress difference mixing of SIS frequency mixer
Intermediate-freuqncy signal, the amplification of this intermediate-freuqncy signal are amplified using HEMT low-noise amplifier, then by frequency link in IF by radio frequency
Signal (1~3GHz) becomes fundamental frequency broadband signal (0~2GHz), so that FFTS directly carries out frequency spectrum processing.
Back end signal handles part in real time: a 2GHz wide band digital FFTS used, output signal is subjected to Spectrum Conversion,
Thus the atmospheric radiation spectrum signal after being calibrated, for convenience of calibration signal, it is necessary to be become output signal using wave detector
Total power signal.It works at a temperature of SIS detector operating environment requirements 4K, therefore low-temperature circulating refrigeration machine system will be used
It is cold, so that the work of SIS and HEMT amplifier apparatus is at low ambient temperatures, to improve the sensitivity of detectable signal and reduce noise
Deng.
High vacuum refrigeration under low-temperature environment and equipment compartment Environmental support part: SIS frequency mixer will work normally, it is necessary to be in 4K
In low temperature environment.In order to reach such low temperature, it is necessary to need vacuum pump and compressor that could provide the 4K low temperature an of high vacuum
Environment, but vacuum pump and compressor must carry out the necessary environment temperature be transformed and just adapt to low temperature (- 40 DEG C~0 DEG C).Entirely
Instrument and equipment will be all placed in equipment compartment, since outdoor environment annual change is larger (- 30 DEG C of winter, 20 degrees Celsius of summer),
Temperature can change with season in equipment compartment, therefore control heating and divulge information to keep temperature in equipment compartment to be suitble to, and meet
The requirement of whole system work.
Systems control division point: we use the special cabinet of Ling Hua scientific & technical corporation, after specially treated, meet wide temperature
Job requirement under environment, chassis power supply is using the warm power supply of Tooker CPCI wide, and controller is controlled using the technical grade of Ling Hua
Device, CAN communication is applied for card applies for card using the technical grade communication of Peaksys company, to realize the control to entire terahertz wave spectrometer
Function processed.
Summary of the invention
It is an object of the invention in view of the drawbacks of the prior art or problem, provide a kind of terahertz wave spectrometer control system
And observation method.
Technical scheme is as follows: a kind of terahertz wave spectrometer control system include: control computer and respectively with
FFTS digital spectrometer, front-end control unit, outdoor control unit, control unit and the light in cabin of the control computer connection
Journey modulation unit；The FFTS digital spectrometer is used to handle the IF output signal of atmosphere receiver system, then will generate
Frequency spectrum data be saved in the network storage of whole system；The front-end control unit is used for centralized control terahertz wave spectrometer
Receiver front end equipment；The outdoor control unit is used for the rotation of control system antenna；Control unit is for real in the cabin
When adjust receiver device cabin in temperature；The optical path modulation unit is used to control spectrometer and receives the stepper motor before window
Straight line travels at the uniform speed.
Preferably, control unit passes through CAN in the front-end control unit, the outdoor control unit and the cabin
Bus bus connects the control computer, and the FFTS digital spectrometer connects the control computer, the light by NET
Journey modulation unit connects the control computer by RS232 bus.
Preferably, the optical path modulation unit is communicated using RS232 mode, and the FFTS digital spectrometer uses net
Network communicates, and control unit is all made of CAN bus in the front-end control unit, the outdoor control unit and the cabin, communicates
Agreement uses Hi-Lon agreement A, i.e. highest order DIR expression data direction in CAN_ID, 1:client to server, and 0:
Server to client；For client equipment, it is only necessary to receive the address of DIR=0, while set DIR in returned data
1。
Preferably, the FFTS digital spectrometer includes the digital spectrometer card of multiple 2.5GHz.
Preferably, the front-end control unit be used for centralized control terahertz wave spectrometer receiver front end equipment, and including
SIS frequency mixer power supply, HEMT APS amplifier power supply, LO link and IF intermediate frequency amplification module.
Preferably, the front-end control unit be used for centralized control terahertz wave spectrometer receiver front end equipment, and including
SIS frequency mixer power supply, HEMT APS amplifier power supply, LO link and IF intermediate frequency amplification module.
It preferably, further include supply control unit, the supply control unit includes Hi-TECH multi-channel dc power supply, and
Be separately connected the control computer, the FFTS digital spectrometer, the front-end control unit, the outdoor control unit,
Control unit and the optical path modulation unit in the cabin, to provide electric energy.
As above a kind of any observation method of terahertz terahertz wave spectrometer control system includes multiple heavy for a kind of basis
Multiple observation cycle step, each repeated measures circulation step include: that continuously to carry out atmosphere impermeable at 15 ° of angles from zenith to pitching
Lightness (Skydip) observation carries out Tau0 fitting to the data of atmospheric opacity；Respectively to high temperature blackbody, room temperature black matrix and
Zenith is integrated, and is carried out to observation spectral line data.
Technical solution provided by the invention has the following beneficial effects:
In High aititude region, most time requirements be can be carried out certainly for the terahertz wave spectrometer control system long-term work
Subjectivity is surveyed or long-range control observation；Supply control unit is the power supply disturbance being isolated between each unit, uses more multi-channel DCs
The mode that power supply is powered respectively, it is contemplated that power-up and powered-down the problem of needing sequence between certain units；
The terahertz wave spectrometer control system is based on (SuSE) Linux OS Ubuntu 14.04LTS i386 (32 versions
This), translation and compiling environment QT5, equipment control bus is based on Socket-CAN network type CAN bus, improves communication to greatest extent
Flexibility, the parameter state of control system use XML file mode and save, conducive to later maintenance and modification operation, control is facilitated
It is fitted the data calibration based on interpolation method about data in system processed, we use most popular Gnu Scientific
Library, network communication use Unix Network Programme Library.Control system hardware is based on Ling Hua company
CPCI Bus realizes and is mounted with two identical controllers and control plate in a control cabinet, full
The foot requirement of extreme environment control system high reliability.Entire telescopic system contain exterior aerial, front end receiver,
Rear end frequency spectrum connects with control system etc..The Control system architecture of extreme environment terahertz wave spectrometer disclosed in this invention is simple
It is compact, safe and reliable, it is easy in the integrated application of other aeromerric moasurenonts and astronomical observation field.
Detailed description of the invention
Fig. 1 is the structural block diagram of terahertz wave spectrometer control system；
Fig. 2 is the atmospheric seeing method schematic diagram of terahertz wave spectrometer control system shown in FIG. 1；
Fig. 3 is atmospheric seeing flow chart.
Fig. 4 is the actual motion flow chart of terahertz wave spectrometer control system.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The description of specific distinct unless the context otherwise, the present invention in element and component, the shape that quantity both can be single
Formula exists, and form that can also be multiple exists, and the present invention is defined not to this.It is appreciated that art used herein
Language "and/or" one of is related to and covers associated listed item or one or more of any and all possible combinations.
As shown in Figure 1, a kind of terahertz wave spectrometer control system includes control computer and calculates respectively with the control
FFTS digital spectrometer, front-end control unit, outdoor control unit, control unit and the optical path modulation unit in cabin of machine connection.
Specifically, control unit passes through CAN in the front-end control unit, the outdoor control unit and the cabin
Bus bus connects the control computer, and the FFTS digital spectrometer connects the control computer, the light by NET
Journey modulation unit connects the control computer by RS232 bus.
That is, the optical path modulation unit is communicated using RS232 mode, the FFTS digital spectrometer is logical using network
It interrogates, control unit is all made of CAN bus, communications protocol in the front-end control unit, the outdoor control unit and the cabin
Using Hi-Lon agreement A, i.e. highest order DIR indicates data direction, 1:client to server, 0:server in CAN_ID
To client；For client equipment, it is only necessary to receive the address of DIR=0, while DIR is set 1 in returned data.
Specifically, Hilon A agreement is accomplished by
The realization of Hilon A agreement based on SocketCAN communication, HiLon agreement A is a puppy parc.The agreement
Based on asymmetric master-slave network structure, broadcast and point-to-point transmission order data are supported, command packet is 256 words
Section.Protocol architecture is based on CAN2.0A frame structure.Table 1 is HiLon-A frame format, and a standard frame is by 11 ID, 1
RTR, 4 DLC, data field composition.
DIR: direction position determines the half priority of frame, and remaining priority is determined by node address, and low address is got over
Small priority is high.Direction position is 1 (reading), and address field is source node address (node address)；Direction position is 0 (writing), and address field is
Destination node address (node address).Address smoothing technology can be used to reduce the network information that need to be handled from node, be somebody's turn to do
Feature effectively saves CAN Node Controller resource, improves controller efficiency.
Add: destination address indicates node address, and range can only be set as 0-125.
DLC: every frame byte number (1-8).
Index: index byte (2Byte) indicates index byte, i.e. this frame data in the packet for multiframe data
Position；If frame data, Index is invalid, is expressed as data.(to transmit high-volume data, this is improvement part)
Data: data.
Type: the type of mark HiLon A frame is specifically defined and is shown in Table 2.
The definition of table 1.HiLon agreement A frame format
Table 2.HiLon A frame type definition
| ID2 (broadcast frame) | ID1 (multiframe) | ID0 (frame end) | Type declaration |
| 1 | 0 | X | Single frames broadcast |
| 0 | 0 | X | Single frames is point-to-point |
| 1 | 1 | 1 | Non- end multiframe broadcast |
| 1 | 1 | 0 | Terminate multiframe broadcast |
| 0 | 1 | 1 | Non- end multiframe is point-to-point |
| 0 | 1 | 0 | It is point-to-point to terminate multiframe |
The realization of HiLON agreement A is realized on the basis of being communicated substantially based on SocketCan, is specifically contained
The reading of single frames and multiframe data is realized in the initialization of SocketCan interface, write operation and read operation automatically in a function
Write operation, the calling of upper layer functions greatly convenient in this way.
It should be noted that the terahertz wave spectrometer control system uses centralized control mode, whole system control
It is realized by a wide temperature range type industrial control computer, then in the present embodiment, the control computer is wide temperature range type industry control
Computer processed.
The FFTS digital spectrometer includes the digital spectrometer card of multiple 2.5GHz, can handle atmosphere receiver simultaneously
Then the frequency spectrum data of generation is saved in the network storage of whole system by the IF output signal of system.
The front-end control unit is used for centralized control terahertz wave spectrometer receiver front end equipment, and includes SIS mixing
Device power supply, HEMT APS amplifier power supply, LO link and IF intermediate frequency amplification module etc. pass through a single control unit to realize
Realize the control of above equipment.
Specifically, the front-end control unit mainly passes through RS485 bus marco and detects LO, SIS, LNA and IF automatically
Etc. equipment, the front-end control unit use the ARM controller STM32 of mainstream, there are power, the abundant equal spies of available resources
Point, convenient for handling heavy Detection task.
The rotation of the outdoor control unit TRS basic control system antenna, and acquire Outdoor Air Parameters and high/low temperature
Calibrate the temperature parameter etc. of black matrix.In the present embodiment, antenna rotation uses stepping decelerating motor, for increasing torque, realizes
High precision position rotation.
Control unit for adjusting the temperature in receiver device cabin in real time in the cabin.Specifically, the indoor environment
Unit for adjusting the temperature in receiver device cabin in real time, if day temperature is excessively high in cabin or evening temperature is too low, leads to
The opening and closing degree for crossing adjustment cabin inner compressor shutter is a Reasonable area by temperature in natural ventilation system adjusting cabin
Between.
Stepper motor straight line of the optical path modulation unit for before controlling spectrometer reception window travels at the uniform speed.Specifically
Ground, the optical path modulation unit, which is used to control spectrometer and receives the stepper motor straight line before window, to travel at the uniform speed, and integrates at one
Continuous operation in 30 seconds periods, since observation receives between the very a height of 200GHz~400GHz of frequency, the wavelength for receiving signal is
0.8~1.5mm, therefore it is that 0.1mm passes through FFTS digital spectrometer after continuous operation 10 seconds that we, which control motor operation step-length,
After integral, can eliminate significantly receive signal in 10 seconds variation and system light path in reflect signal influence, repeatedly
Observation frequency spectrum signal-to-noise ratio can be improved afterwards.
Selectively, the terahertz wave spectrometer control system further includes supply control unit, the supply control unit
Including Hi-TECH multi-channel dc power supply, and it is separately connected the control computer, the FFTS digital spectrometer, the front end
Control unit, the outdoor control unit, control unit and the optical path modulation unit in the cabin, to provide electric energy.
Specifically, in the present embodiment, the supply control unit realizes that a CAN is total by CAN RS 232 controller
Line can control 6 DC power supplies.
In addition, in the present embodiment, the data of the terahertz wave spectrometer control system, which store, to be used
RackStation RS814+/RS814RP+, to provide high-performance, extendible and fully functional network storage solutions, energy
Meets the needs of middle-size and small-size data storage, after the completion of each observation cycle, data are directly stored in current NAS by FFTS.
A kind of observation method for the terahertz terahertz wave spectrometer control system that basis is as shown in Figure 1 includes multiple repeated measures
Circulation step, each repeated measures circulation step include:
Step 1: 15 ° of angles continuously carry out atmospheric opacity (Skydip) observation from zenith to pitching, impermeable to atmosphere
The data of lightness carry out Tau0 fitting；
Step 2: high temperature blackbody, room temperature black matrix and zenith being integrated respectively, and observation spectral line data is carried out.
Wherein, in step 1,15 ° of angles continuously carry out atmospheric opacity (Skydip) observation from zenith to pitching, right
Following (the ignoring dome influence) T of atmospheric opacity Tau0 fitting formulaobs=Trx+Tatm(1-e-τ/sin(el))；
In step 2, is integrated to high temperature blackbody single 10 second time, amounts to integral three times, PLM is controlled in each integral process
Device continuous operation processed, the speed of service use 0.1 mm/second of fixed speed, and range ability is 1mm within 10 seconds, meets range ability
Greater than 1/4 wavelength of observation wavelength；
Moreover, integrating 10~30 second time to room temperature black matrix, observation method is same as above；
Is integrated to zenith, observation method is same as above 10~30 second time；
Moreover, observation spectral line data calibration equation is as follows:System noise temperature
Calculation formula is as follows: Tsys=((Thot-Tcold*y1)/(y1-1)+Tcold)/y2, wherein: y1=Tp_hot/Tp_cold,
Y2=Tp_cold/Tp_obs.
As shown in Fig. 2, the observed pattern of the observation method are as follows: in primary complete observation, need to observe simultaneously
Skydip and spectral line observation；
As shown in figure 3, the observed object sequence of the observation method are as follows: atmospheric opacity Skydip observation, high temperature are black
Body, what zenith of low temperature black matrix.
Moreover, the observation time of the observation method are as follows: every frame zenith spectral line needs the time of integration 30 seconds, high/low temperature
Black matrix respectively needs to integrate 30 seconds, and atmospheric opacity Skydip observes 2 minutes, in addition to this has and calibrates preservation data etc., and one
Spectral line is about 4 minutes.Such as the signal-to-noise ratio for improving observation spectral line, need to increase the time of integration of observation, or can be according to reality
Border situation reduces observation time.
It is as follows to observe spectral line data calibration equation:
Atmospheric opacity Tau0 fitting formula is following (influence for not accounting for dome), bigger in atmospheric opacity
When, ignore dome influence:
Tobs=Trx+Tatm(1-e-τ/sin(el)) (2)
When atmospheric opacity is smaller, need to consider that dome influences:
Then have:
It enablesThen there is Real Atmosphere opacity calibration equation to have:
τ=τ '-ln (k) (7)
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (8)
1. a kind of terahertz wave spectrometer control system, it is characterised in that: include: control computer and counted respectively with the control
FFTS digital spectrometer, front-end control unit, outdoor control unit, control unit and the optical path modulation list in cabin of calculation machine connection
Member；
The FFTS digital spectrometer is used to handle the IF output signal of atmosphere receiver system, then by the spectrum number of generation
According in the network storage for being saved in whole system；
The front-end control unit is used for centralized control terahertz wave spectrometer receiver front end equipment；
The outdoor control unit is used for the rotation of control system antenna；
Control unit for adjusting the temperature in receiver device cabin in real time in the cabin；
Stepper motor straight line of the optical path modulation unit for before controlling spectrometer reception window travels at the uniform speed.
2. a kind of terahertz wave spectrometer control system according to claim 1, which is characterized in that the front-end control list
First, the described outdoor control unit passes through CAN Bus bus with control unit in the cabin and connects the control computer, described
FFTS digital spectrometer connects the control computer by NET, and the optical path modulation unit passes through described in the connection of RS232 bus
Control computer.
3. a kind of terahertz wave spectrometer control system according to claim 2, which is characterized in that the optical path modulation unit
It is communicated using RS232 mode, the FFTS digital spectrometer uses network communication, the front-end control unit, the room
Control unit is all made of CAN bus in outer control unit and the cabin, and communications protocol uses Hi-Lon agreement A, i.e. CAN_ID
Middle highest order DIR indicates data direction, 1:client to server, 0:server to client；For client equipment, only need
The address of DIR=0 is received, while DIR is set 1 in returned data.
4. a kind of terahertz wave spectrometer control system according to claim 1, which is characterized in that the FFTS digital spectrum
Instrument includes the digital spectrometer card of multiple 2.5GHz.
5. a kind of terahertz wave spectrometer control system according to claim 1, which is characterized in that the front-end control unit
For centralized control terahertz wave spectrometer receiver front end equipment, and including SIS frequency mixer power supply, HEMT APS amplifier power supply, LO
Link and IF intermediate frequency amplification module.
6. a kind of terahertz wave spectrometer control system according to claim 1, which is characterized in that the front-end control unit
For centralized control terahertz wave spectrometer receiver front end equipment, and including SIS frequency mixer power supply, HEMT APS amplifier power supply, LO
Link and IF intermediate frequency amplification module.
7. a kind of terahertz wave spectrometer control system according to claim 1, which is characterized in that further include power supply control list
Member, the supply control unit include Hi-TECH multi-channel dc power supply, and are separately connected the control computer, the FFTS
Digital spectrometer, the front-end control unit, the outdoor control unit, control unit and the optical path modulation list in the cabin
Member, to provide electric energy.
8. a kind of a kind of any observation method of terahertz terahertz wave spectrometer control system of basis such as claim 1-7,
It is characterized in that, including multiple repeated measures circulation steps, each repeated measures circulation step includes:
15 ° of angles continuously carry out atmospheric opacity observation from zenith to pitching, carry out Tau0 to the data of atmospheric opacity
Fitting；
High temperature blackbody, room temperature black matrix and zenith are integrated respectively, and observation spectral line data is carried out.
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| CN115060684A (en) * | 2022-06-01 | 2022-09-16 | 中电科思仪科技股份有限公司 | Terahertz near-field scattering weak signal demodulation device |
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