CN206975071U - A kind of MHD angular-rate sensors dynamic noise measurement apparatus - Google Patents
A kind of MHD angular-rate sensors dynamic noise measurement apparatus Download PDFInfo
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- CN206975071U CN206975071U CN201720464259.0U CN201720464259U CN206975071U CN 206975071 U CN206975071 U CN 206975071U CN 201720464259 U CN201720464259 U CN 201720464259U CN 206975071 U CN206975071 U CN 206975071U
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Abstract
The utility model discloses a kind of MHD angular-rate sensors dynamic noise measurement apparatus, module, impedance-matching transformer module, signal acquisition module, noise analysis module and power module occurs by vibration to form, vibration occurs to be provided with MHD angular-rate sensors in module, vibration occurs module and provides micro- angular oscillation excitation, MHD angular-rate sensors receive vibration and micro- angular oscillation information that module provides and output voltage signal occur, and impedance-matching transformer module is used for the dynamic noise for measuring sensing element；Signal acquisition module gathers the output signal of impedance-matching transformer module, and noise analysis module separation and Extraction goes out noise contribution.The device can independently measure MHD angular-rate sensor sensing element dynamic noises, the dynamic noise of sensing element and the dynamic noise of pre-amplification circuit are precisely separating from MHD angular-rate sensor dynamic noises, and effectively suppress the coupled noise in measurement process, optimize the noise coefficient of measurement, improve the measurement accuracy of noise.
Description
Technical field
The utility model belongs to noise electronic and Technique of Weak Signal Detection field, is to be related to a kind of MHD specifically
Angular-rate sensor dynamic noise measurement apparatus.
Background technology
With the development of modern spacecraft, especially navigated with high-resolution earth observation remote sensing satellite, survey of deep space remote sensing
Its device, the high-precision spacecraft that deep-space laser communication satellite is representative, it is extremely sensitive to micro-vibration disturbance effect, space structure
Micro-vibration perturbed problem turned into limit one that high-precision Spacecraft Attitude Control precision and stability further improves it is main
Factor.
Magnetohydrodynamics (Magnetohydrodynamics, MHD) angular-rate sensor have concurrently low noise, broadband,
The features such as miniaturization, long-life, acceleration is impacted insensitive.Compared to accelerometer, gyroscope, laser radar and optic communication
The methods of terminal, MHD angular-rate sensors be current inflight measurement spacecraft and the micro- angular oscillation information of payload most directly,
Effective and reliable instrument.
MHD angular-rate sensors measure the inertia sensitive element of angular speed compared to gyro etc., and its low frequency characteristic is poor, but
With good high frequency characteristics, therefore the micro- angular oscillation information of several hertz of widebands to a KHz can be measured.MHD angular speed passes
Sensor is generally made up of sensing element part and pre-amplification circuit part.The main evaluation index of MHD angular-rate sensors is to make an uproar
Sound is horizontal, is divided into static noise and dynamic noise.MHD angular-rate sensor dynamic noises are that it is in the measurement micro- angular oscillation of wideband
Noise level under working condition, demarcation is being measured to this index using preceding needs.
Utility model content
The utility model can not independent evaluations in order to solve existing MHD angular-rate sensors noise testing equipment and method
The problem of MHD angular-rate sensor sensing element dynamic noises, MHD angular-rate sensor sensing element dynamic noises can not be separated
The problem of with pre-amplification circuit dynamic noise, and dynamic noise measurement accuracy it is low, introduce noise it is big the problem of, it is proposed that one
Kind MHD angular-rate sensor dynamic noise measurement apparatus.The dynamic noise measurement apparatus can independently measure MHD angular speed sensing
Device sensing element dynamic noise, the dynamic noise of sensing element is precisely separating from MHD angular-rate sensor dynamic noises with before
The dynamic noise of amplifying circuit is put, and effectively suppresses the coupled noise in measurement process, optimizes the noise coefficient of measurement, improves
The measurement accuracy of noise.
The purpose of this utility model is achieved through the following technical solutions：
A kind of MHD angular-rate sensors dynamic noise measurement apparatus, module, impedance-matching transformer mould are occurred by vibration
Block, signal acquisition module, noise analysis module and power module composition, the vibration occur to be provided with MHD angular speed in module
Sensor, the MHD angular-rate sensors are built-in with sensing element and pre-amplification circuit, and it is micro- that module offer occurs for the vibration
Angular oscillation encourages, and MHD angular-rate sensors receive vibration and micro- angular oscillation information that module provides and output voltage signal, institute occurs
The dynamic noise that impedance-matching transformer module is used to measure the sensing element is stated, realizes sensing element and signal acquisition module
Between impedance matching, amplify sensing element output signal to no additional noise；The signal acquisition module gathers impedance matching
The output signal of transformer module, the noise analysis module go out noise contribution for separation and Extraction；The power module provides
Working power voltage, prevent external noise from being conducted by power source path to noise analysis module, it is ensured that the precision of noise testing.
The MHD angular-rate sensors are provided with two in distribution up and down.
The vibration occurs module and is made up of frock and high-precise uniaxial turntable, the rotary shaft of the high-precise uniaxial turntable
The sensitive axes of line and the MHD angular-rate sensors are coaxial.
The impedance-matching transformer module is made up of impedance-matching transformer and secondary amplifier.
The signal acquisition module is made up of Signals Transfer Board and data acquisition card.
Compared with prior art, beneficial effect caused by the technical solution of the utility model is：
1st, the utility model creatively realizes MHD angular-rate sensor sensing elements using impedance transformer module and moved
The measurement of state noise, solve prior art because MHD angular-rate sensor sensing element output signal amplitudes are too small, extract mould
Block noise is compared to excessive, and the problem of can not individually extract MHD angular-rate sensor sensing element dynamic noise information.
2nd, the utility model creatively uses the scheme of step measurement noise, and this is prior art without the side used
Case.Step measurement noise can provide MHD angular-rate sensors sensing element, pre-amplification circuit and sensor entirety respectively
Dynamic noise, the overall dynamic noise of MHD angular-rate sensors can only be provided compared with prior art, realize MHD angular speed biography
The separation of sensor different piece dynamic noise, more comprehensive detailed noise information can be provided.
3rd, the impedance-matching transformer module in the utility model, signal acquisition module, noise analysis module and power supply mould
The noise information of block be, it is known that and using impedance matching, shielding, ground connection and pure power supply technology, optimize making an uproar for measurement apparatus
Sonic system number, introducing noise is small, close not gather signal to additional noise.Therefore the utility model can accurately extract MHD angles speed
The dynamic noise information of sensor is spent, noise testing precision is high.
4th, the utility model impedance-matching transformer module flexible design is adjustable, can adjust MHD angular speed biography as needed
Sensor static noise measuring range and bandwidth, solve the problems, such as that prior art noise testing range is small, narrow bandwidth.
Brief description of the drawings
Fig. 1 is the MHD angular-rate sensor sensing element dynamic noise measuring principle figures of the utility model patent.
Fig. 2 is the MHD angular-rate sensor pre-amplification circuit dynamic noise measuring principle figures of the utility model patent.
Fig. 3 is the MHD angular-rate sensor overall dynamics noise testing schematic diagrams of the utility model patent.
Fig. 4 is the dynamic noise extraction procedure flow chart of the utility model patent.
Fig. 5 is the MHD angular-rate sensor angular speed dynamic noise spectrum densities of the utility model patent.
Fig. 6 is the MHD angular-rate sensor Angle Position dynamic noise spectrum densities of the utility model patent.
Embodiment
The utility model will be further described below in conjunction with the accompanying drawings：
Two MHD angular-rate sensors 1 and 2 (see Fig. 3) are selected in the present embodiment, Fig. 1 is the MHD of the utility model patent
The dynamic noise measuring principle figure of the sensing element 101 and 201 of angular-rate sensor 1 and 2.Two Hes of MHD angular-rate sensors 1
The voltage that 2 sensing element 101 and 201 exports respectively is measurand, and MHD angular-rate sensors 1 and 2 are simultaneously not belonging to the device
Part.The MHD angular-rate sensor dynamic noise measurement apparatus is by two impedance-matching transformer modules 3 and 4, one
The individual power module 7 of noise analysis module 6, one of signal acquisition module 5, one and a vibration occur module 8 and formed.
Vibration occurs module 8 and is made up of frock 801 and high-precise uniaxial turntable 802.MHD angular-rate sensors 1 and 2 it is quick
Sensing unit 101 and 201 is fixed on high-precise uniaxial turntable 802 (see Fig. 3) by frock 801, on sensing element 101 and 201
Lower distribution, and coaxial of the sensitive axes of two sensing elements all with high-precise uniaxial turntable 802, this is by frock
801 ensure.The output voltage signal of sensing element 101 and 201 is transferred to impedance-matching transformer module 3 by coaxial line
With the impedance-matching transformer 301 and 401 of 4 input, an output end of impedance-matching transformer 301 and 401 connects respectively
Secondary amplifier 302 and 402 is connect, another output end connects earthing of casing end 303 and 403 respectively.Impedance-matching transformer mould
The output end vo 1 and Vo2 and earth terminal GND of block 3 and 4 connect the mould of data acquisition card 502 by Signals Transfer Board 501 respectively
Intend positive input terminal ai1+ and ai2+ and simulation ground AGND, data acquisition card 502 is adopted from the signal of NI companies in the present embodiment
Truck PCI6289, the two paths of signals collected are input to noise analysis module 6.Noise analysis module 6 is to utilize industrial computer 602
Noise extraction procedure 601 realize that and calculate noise power spectrum, industrial computer selects IPC-610MB.Impedance matching transformation
The secondary amplifier 302 and 402 of device module 3 and 4 is powered by power module 7.The out-put supply of lithium battery 701 passes through switch change-over
702 and filter network, reuse low pressure difference linearity voltage regulation adjustor 703 and pure stabilized power source, positive-negative power and COM ends are provided.
The COM ends of power module 7, the earth terminal and signal acquisition of the secondary amplifier 302 and 402 of impedance-matching transformer module 3 and 4
The analogue ground AGND of card 502 is connected as one, and is realized by shielded cable.Because impedance-matching transformer module and signal are adopted
Collect the noise of module, it is known that the He of sensing element 101 of MHD angular-rate sensors 1 and 2 therefore can be extracted by the method
201 static noise.
Fig. 2 represents the dynamic noise measuring principle figure of the pre-amplification circuit 103 and 203 of MHD angular-rate sensors 1 and 2.
The pre-amplification circuit 103 and 203 of MHD angular-rate sensors 1 and 2 is placed on high-precision angle vibration table 802 (see Fig. 3), is protected
It is consistent when holding angular oscillation pumping signal with measurement sensing element 101 and 201 dynamic noise.Pre-amplification circuit 103 and 203 it is defeated
Enter the resistance 102 and 202 that end connects two 1 ohm respectively, realize the short circuit of the input of pre-amplification circuit 103 and 203.It is preposition
Amplifying circuit 103 and 203 is both-end output mode, and two output end vo 1+ and Vo1- and Vo2+ and Vo2- connect letter respectively
Two simulation positive-negative input end ai1+ and ai1- and ai2+ and ai2- of number capture card 502.Pre-amplification circuit 103 and 203
Ground be connected to the simulation ground AGND of data acquisition card 502.The output end vo 1+ and Vo1- of pre-amplification circuit 103 and 203 and
Vo2+ and Vo2- is connected to GND by 1 kilohm of resistance.Data acquisition card 502 is operated in Differential Input pattern.It is preposition
Amplifying circuit 103 and 203 is powered by power module 7.The COM ends of power module 7, the earth terminal of pre-amplification circuit 103 and 203
Connected as one with the analogue ground AGND of data acquisition card 502.MHD angular speed can be extracted by such a method to sense
The dynamic noise of the pre-amplification circuit 103 and 203 of device 1 and 2.
Fig. 3 represents the overall dynamics noise testing schematic diagram of the MHD angular-rate sensors 1 and 2 of the utility model patent.
MHD angular-rate sensors 1 and 2 are fixed on high-precise uniaxial turntable 802 by frock 801 and 803, MHD angular-rate sensors 1
It is distributed with about 2, and coaxial of the sensitive axes of two sensors all with high-precise uniaxial turntable 802, this is by work
801 and 803 are filled to ensure.First by the sensing element 101 and 201 and pre-amplification circuit of MHD angular-rate sensors 1 and 2
103 and 203 are respectively connected together, i.e., the inner and outer electrodes of sensing element 101 and 201 are connected respectively into preposition amplification
The input of circuit 103 and 203.Screening cover 104 and 204 has with the shell of sensing element 101 and 201 respectively good electrically to be connected
Connect, the shell and screening cover 104 and 204 of sensing element 101 and 201 have respectively constituted the shielding of pre-amplification circuit 103 and 203
Housing.The shell of aviation plug 105 and 205 has good electrical connection, the shielding of shielding line with screening cover 104 and 204 respectively
Layer has good electrical connection with aviation plug 105 and 205, and with being connected to the simulation of data acquisition card 502 AGND, so will
The shell of sensing element 101 and 201, screening cover 104 and 204, the shell of aviation plug 105 and 205, shielding line screen layer and
The simulation of data acquisition card 502 AGND link into an integrated entity respectively, the COM ends of power module 7 and the He of pre-amplification circuit 103
203 earth terminals connect as one, and form effective shielding and ground connection.Data acquisition card 502 works in difference modes, and collection is preposition
Voltage signal between amplifying circuit 103 and 203 two output ends.MHD angular speed can be extracted by such a method to sense
The overall dynamics noise of device 1 and 2.
Signal acquisition module is to two MHD angular-rate sensors 1 and 2 (or two sensing elements 101 and 201, or before two
Put amplifying circuit 103 and continuous output signal X (t) 203) and Y (t) is sampled, obtaining sensor output signal has limit for length
Sample sequence X (n) and Y (n).X (n) and Y (n) auto-correlation function RXAnd RYRespectively：
RX(m)=E [X (n) X (n+m)]
RY(m)=E [Y (n) Y (n+m)]
X (n) and Y (n) cross-correlation function RXYFor：
RXY(m)=E [X (n) Y (n+m)]
Then X (n) and Y (n) auto-power spectrum SXAnd SYRespectively：
Then X (n) and Y (n) crosspower spectrum SXYFor：
Coherent functionFor：
Wherein
Obtain two MHD angular-rate sensors 1 and 2 (or two sensing elements 101 and 201, or two pre-amplification circuits
103 and dynamic noise power spectral density 203)WithRespectively：
Unit is V2/Hz。
Known two MHD angular-rate sensors 1 and 2 (or two sensing elements 101 and 201, or two pre-amplification circuits
103 and constant multiplier SF 203)XAnd SFY, two MHD angular-rate sensors 1 and 2 (or two Hes of sensing element 101 can be obtained
201, or two pre-amplification circuits 103 and angular speed dynamic noise spectrum density NER 203)XAnd NERYRespectively
Unit is (rad/s)2/ Hz, such as Fig. 5.
Such as Fig. 6, while two MHD angular-rate sensors 1 and 2 (or two sensing elements 101 and 201, or two can be tried to achieve
Pre-amplification circuit 103 and Angle Position dynamic noise spectrum density NEA 203)XAnd NEAYRespectively：
Unit is rad2/Hz。
The utility model is not limited to embodiments described above.The description to embodiment is intended to describe above
With explanation the technical solution of the utility model, above-mentioned embodiment is only schematical, is not restricted.
In the case of not departing from the utility model aims and scope of the claimed protection, one of ordinary skill in the art is in this practicality
The specific conversion of many forms can be also made under new enlightenment, these are belonged within the scope of protection of the utility model.
Claims (5)
1. a kind of MHD angular-rate sensors dynamic noise measurement apparatus, it is characterised in that module, impedance matching are occurred by vibration
Transformer module, signal acquisition module, noise analysis module and power module composition, the vibration occur to be provided with module
MHD angular-rate sensors, the MHD angular-rate sensors are built-in with sensing element and pre-amplification circuit, and the vibration occurs
Module provides micro- angular oscillation excitation, and MHD angular-rate sensors receive vibration and micro- angular oscillation information that module provides occurs and exports
Voltage signal, the impedance-matching transformer module are used to measure the dynamic noise of the sensing element, realize sensing element with
Impedance matching between signal acquisition module, amplify sensing element output signal to no additional noise；The signal acquisition module
The output signal of impedance-matching transformer module is gathered, the noise analysis module goes out noise contribution for separation and Extraction；It is described
Power module provides working power voltage, prevents external noise from being conducted by power source path to noise analysis module, it is ensured that noise is surveyed
The precision of amount.
A kind of 2. MHD angular-rate sensors dynamic noise measurement apparatus according to claim 1, it is characterised in that the MHD
Angular-rate sensor is provided with two in distribution up and down.
3. a kind of MHD angular-rate sensors dynamic noise measurement apparatus according to claim 1, it is characterised in that described to shake
The dynamic module that occurs is made up of frock and high-precise uniaxial turntable, the pivot center of the high-precise uniaxial turntable and the MHD angles
The sensitive axes of velocity sensor are coaxial.
A kind of 4. MHD angular-rate sensors dynamic noise measurement apparatus according to claim 1, it is characterised in that the resistance
Anti- matching transformer module is made up of impedance-matching transformer and secondary amplifier.
A kind of 5. MHD angular-rate sensors dynamic noise measurement apparatus according to claim 1, it is characterised in that the letter
Number acquisition module is made up of Signals Transfer Board and data acquisition card.
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| CN106940388A (en) * | 2017-04-28 | 2017-07-11 | 天津大学 | A kind of MHD angular-rate sensors dynamic noise measurement apparatus and method |
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