CN105356879A - Signal conditioning circuit for acceleration sensor with high g value - Google Patents

Abstract

The invention discloses a signal conditioning circuit for an acceleration sensor with a high g value. The signal conditioning circuit is composed of an isolation amplification circuit, an alternating-current coupled circuit, a first voltage following circuit, a voltage bias circuit, a low-pass filter circuit and a second voltage following circuit sequentially connected in series; the isolation amplification circuit is used for performing signal isolation amplification and power supply isolation of a sensing signal Signal_in output by the acceleration sensor with the high g value and then outputting an isolation amplified signal Signal_out1; and the low-pass filter circuit is a unit gain two-order voltage-controlled voltage source low-pass filter circuit constructed by utilizing an integrated operational amplifier. According to the invention, the signal waveform can be improved; frequency confusion while discretizing is prevented; adverse effects of noise are overcome in the event that the signal and a noise spectrum are not overlapped; the signal to noise ratio is increased; furthermore, aiming at different attack targets, sensor signals can be effectively modified; preceding-stage analogue signals easy to identify and process are provided for a burst control algorithm precisely damaged by a hard target penetration warhead; and the signal conditioning circuit can stably work in a 100000g impact environment.

Description

A kind of high shock acceleration sensor signal conditioning circuit

Technical field

The present invention relates to a kind of high shock acceleration sensor signal conditioning circuit, described high-g level can reach 100000g.

Background technology

Can Hard Target Penetrating Fuze be one of the key factor of effective damage hard goal, and its core is exactly the self adaptation Burst selection technology under high overload environmental condition.

The penetration of hard goal is a very complicated physical process, and the shock played between order is also very complicated phenomenon, along with the great variety of kinematic parameter and energy.One just must be selected to realize to change the most obvious to the counting in destination layer and hole, and the feature being easy to detection and utilizing.In Penetration, the loss main transition of kinetic energy has become heat energy and shock wave energy etc., and the physical quantity variation of this form is not obvious, and detection difficulty is also very large.And in three dominant motion parameters two: Penetration Depth and speed, all cannot direct-detection, invading is the quadratic integral of acceleration deeply, speed is an integration of acceleration, final measure physical quantities is the requirement of penetration acceleration, its coincidence measurement, is the comprehensive embodiment of various factors.

At present, Hard Target Penetrating Fuze mainly contains four kinds to the initiation control mode that hard goal is implemented accurately to injure: timing controlled mode, meter layer/meter hole control mode, meter Stroke Control mode, destination media identification control mode, these four kinds of Burst selection modes can both effectively control Penetrating Warhead and detonate in hard goal in good time, reach damage effectiveness.Wherein, according to high shock acceleration sensor conditioned signal, to be exactly fuse judge that the moment invading target is as time zero to timed detonation, when the time then, send time break, control warhead blast; Meter layer detonation mode is exactly target when being multilayer hard goal, and fuze circuit transducer conditioned signal calculates the number of plies that penetration bullet penetrates target, controls Qinzhou harbor and detonates after predetermined destination layer.Destination media identification detonation mode is the destination media of the current penetration of processes sensor conditioned signal identification in real time in the Penetration of bullet, controls bullet and detonates can cause the dielectric layer place of target maximum damage effectiveness.

No matter which kind of mode, prerequisite is the useful signal that must obtain high shock acceleration sensor, therefore, in the urgent need to developing a kind of circuit that can carry out effectively conditioning to high shock acceleration sensor output signal, to increase the reliability of Fuze target identification, and can steady operation under high g value impact environment.

Summary of the invention

Technical problem to be solved by this invention is: for the deficiencies in the prior art, provide a kind of high shock acceleration sensor signal conditioning circuit, signal waveform can be improved, frequency alias when preventing discretization, under signal and the nonoverlapping situation of noise spectrum, overcome the adverse effect of noise, improve signal to noise ratio; And can strike target for different, sensor signal is effectively nursed one's health, the Burst Control Algorithm of accurately injuring for hard goal Penetrating Warhead provide be easy to identify, the prime analog signal of process, and can under 100000g shock environment steady operation.

The present invention includes following technical scheme:

A kind of high shock acceleration sensor signal conditioning circuit, is composed in series successively by isolating amplifier circuit, ac-coupled circuit, the first voltage follower circuit, voltage offset electric circuit, low-pass filter circuit and the second voltage follower circuit, isolating amplifier circuit carries out signal isolation to the transducing signal Signal_in that high shock acceleration sensor exports and amplifies and export the signal Signal_out1 after isolation amplification after isolated from power, output AC signal Signal_out2 after signal Signal_out1 removal DC component after ac-coupled circuit amplifies isolation, first voltage follower circuit to AC signal Signal_out2 carry out buffer compartment from and export low-impedance isolation signals Signal_out3 after reducing output impedance, voltage offset electric circuit obtains the signal Signal_out4 after superposing after superposing direct current signal to isolation signals Signal_out3, low-pass filter circuit carries out low-pass filtering output low frequency signal Signal_out5 to signal Signal_out4, second voltage follower circuit to low frequency signal Signal_out5 carry out buffer compartment from and export low-impedance isolation signals Signal_out after reducing output impedance, described low-impedance isolation signals Signal_out exports to AD converter and processes,

Isolating amplifier circuit comprises resistance R1-R6 and transformer coupled isolated amplifier, transducing signal Signal_in described in resistance R1 mono-termination, the other end respectively with one end of resistance R2, the negative input end of transformer coupled isolated amplifier is connected, the other end of resistance R2 is connected with a stiff end of adjustable resistance R6, another stiff end of adjustable resistance R6 is connected with the feedback end FB of isolated amplifier, the adjustable side of adjustable resistance R6 is connected with a stiff end of described adjustable resistance R6, resistance R3, one end of R4 is connected with the positive input terminal of isolated amplifier respectively, the other end of resistance R3 is connected with the input ground end INCOM of isolated amplifier, input ground end INCOM connects input in analog simultaneously, the other end of resistance R4 is connected with the adjustable side of adjustable resistance R5, one stiff end of zero-regulator resistor R5 is connected with the insulating power supply anode VISO+ of isolated amplifier, another stiff end of zero-regulator resistor R5 is held with the insulating power supply negative terminal VISO-of isolated amplifier and is connected, the signal output part Hi of isolated amplifier exports and isolates the signal Signal_out1 after amplifying, and the signal ground end Lo of isolated amplifier connects output in analog, described low-pass filter circuit is the unit gain second order voltage controlled voltage source low-pass filter circuit utilizing integrated operational amplifier to build.

The intermediate value of the signal Signal_out4 after described superposition is the intermediate value of A/D converter acquisition range.

High shock acceleration sensor is for exporting acceleration signal during hard goal penetration.

Described transformer coupled isolated amplifier is AD202.

Ac-coupled circuit is made up of tantalum electric capacity C3, and the signal Signal_out1 after isolation amplification described in a termination of tantalum electric capacity C3, the other end exports described AC signal Signal_out2.

Described voltage offset electric circuit comprises resistance R7, resistance R8, resistance R11 and the first operational amplifier, the isolation signals Signal_out3 that one end and first voltage follower circuit of resistance R7 export is connected, the other end of resistance R7 is connected with the positive input terminal of the first operational amplifier, one end of resistance R8 is connected with the positive input terminal of the first operational amplifier, another termination power VCC of resistance R8, the negative input end of the first operational amplifier connects in analog by resistance R11, the signal Signal_out4 after the output output offset of the first operational amplifier.

Described low-pass filter circuit comprises resistance R9-R10, electric capacity C1-C2 and the second operational amplifier, one end of resistance R9 with biased after signal Signal_out4 be connected, the other end difference connecting resistance R10 of resistance R9, one end of electric capacity C1, the positive input terminal of another termination second operational amplifier of resistance R10, the output of another termination second operational amplifier of electric capacity C1; The positive input terminal of one termination second operational amplifier of electric capacity C2, another termination of electric capacity C2 in analog, the negative input end of the second operational amplifier connects the output of in analog with the second operational amplifier respectively, the low frequency signal Signal_out5 after the output output filtering of the second operational amplifier.

R ₉, R ₁₀select Mirror Grinding.

C ₁, C ₂select mylar electric capacity.

The present invention compared with prior art tool has the following advantages:

The present invention effectively nurses one's health high shock acceleration sensor sensor output analog signals, improve signal waveform, frequency alias when preventing discretization, the adverse effect of noise is overcome under signal and the nonoverlapping situation of noise spectrum, improve signal to noise ratio, and can strike target for different, sensor signal is effectively nursed one's health, for accurately injure algorithm provide be easy to identify, process acceleration information, and can under 100000g shock environment steady operation.The signal condition mode of this circuit possesses the function of the completely isolated feature of input/output signal and multifrequency point low-pass filtering, solve signal conditioning circuit unstable properties, the problem such as large affected by environment in the past, meet demand under battle conditions, the overload signal exported is reliably accurate, is convenient to subsequent conditioning circuit and carries out signal transacting.

Isolating amplifier circuit adopts isolated amplifier to be main amplifier part, direct circuit is not had to be coupled between its input, output and power circuit, namely sensor signal does not have public earth terminal in transmitting procedure, can accomplish ohmic isolation between input circuit and amplifier export.Can the output gain of effective conditioning signal by arranging suitable resistance, this circuit can also effectively eliminate the measure error caused by ground loop.

Ac-coupled circuit utilizes the characteristic of electric capacity " stopping direct current is logical to be exchanged " remove the DC component in signal and do not have influential feature to pure AC signal, effectively can eliminate the impact of DC component in high-g level acceleration signal, thus make sensor signal be stabilized in 0V baseline, eliminate the baseline shift that Sensor temperature drift brings.

Voltage offset electric circuit utilizes operational amplifier to build in-phase adder, the intermediate value of output signal is made to be the intermediate value of A/D converter acquisition range in fuse, because preamplifying circuit exports as differential signal (negativeacceleration is negative value), and in fuse, A/D converter acquisition range is single ended mode.Therefore, adopt such processing mode that fuse can be made to carry out analog-to-digital conversion easily.

The low-pass filter circuit that the design adopts utilizes operational amplifier to build unit gain second order voltage controlled voltage source low-pass filter circuit to realize, and can arrange the cut-off frequency of filter by mating suitable R, C easily.Through this filter circuit of verification experimental verification, there is good filtering characteristic and job stability.

Voltage follower circuit utilizes operational amplifier to build voltage follower, as the buffer stage between whole modulate circuit amplifying circuit and last output stage (before namely conditioned signal enters fuse AD).The effect of voltage follower is impedance transformation, and it is very little that very high, the output impedance that input impedance can be become become, and effectively can improve certainty of measurement.

Accompanying drawing explanation

Fig. 1 is the composition frame chart of high shock acceleration sensor signal conditioning circuit;

Fig. 2 is isolating amplifier circuit schematic diagram;

Fig. 3 is voltage offset electric circuit schematic diagram;

Fig. 4 is low-pass filter circuit schematic diagram;

Fig. 5 is voltage follower circuit schematic diagram.

Embodiment

Just by reference to the accompanying drawings the present invention is described further below.

High shock acceleration sensor signal conditioning circuit is a part very crucial in fuze system, and it nursed one's health sensor output signal before data acquisition process, and the quality of its performance directly determines the performance and reliability of system.Because sensor output signal is very faint and inevitably there is various interference and noise, in order to subsequent acquisition treatment circuit can obtain desirable data, as shown in Figure 1, signal conditioning circuit of the present invention is composed in series successively by isolating amplifier circuit, ac-coupled circuit, the first voltage follower circuit, voltage offset electric circuit, low-pass filter circuit and the second voltage follower circuit; isolating amplifier circuit carries out signal isolation to the transducing signal Signal_in that high shock acceleration sensor exports and amplifies and export the signal Signal_out1 after isolation amplification after isolated from power, ac-coupled circuit is to output AC signal Signal_out2 after Signal_out1 removal DC component, first voltage follower circuit to AC signal Signal_out2 carry out buffer compartment from and export low-impedance isolation signals Signal_out3 after reducing output impedance, voltage offset electric circuit superposes direct current signal to isolation signals Signal_out3, the intermediate value of the signal Signal_out4 after superposition is made to be the intermediate value of A/D converter acquisition range in fuse, low-pass filter circuit carries out low-pass filtering output low frequency (lower than cut-off frequency) signal Signal_out5 to signal Signal_out4, second voltage follower circuit to low frequency signal Signal_out5 carry out buffer compartment from and export low-impedance isolation signals Signal_out after reducing output impedance, described low-impedance isolation signals Signal_out exports to AD converter and processes.Described high shock acceleration sensor can be Piezoresistive Accelerometers with High-g Value.

As shown in Figure 2, isolating amplifier circuit comprises resistance R1-R6 and transformer coupled isolated amplifier, transducing signal Signal_in described in resistance R1 mono-termination, the other end respectively with one end of resistance R2, the negative input end of transformer coupled isolated amplifier is connected, the other end of resistance R2 is connected with a stiff end of adjustable resistance R6, another stiff end of adjustable resistance R6 is connected with the feedback end FB of isolated amplifier, the adjustable side of adjustable resistance R6 is connected with a stiff end of described adjustable resistance R6, resistance R3, one end of R4 is connected with the positive input terminal of isolated amplifier respectively, the other end of resistance R3 is connected with the input ground end INCOM of isolated amplifier, input ground end INCOM connects input in analog simultaneously, the other end of resistance R4 is connected with the adjustable side of adjustable resistance R5, one stiff end of zero-regulator resistor R5 is connected with the insulating power supply anode VISO+ of isolated amplifier, another stiff end of zero-regulator resistor R5 is held with the insulating power supply negative terminal VISO-of isolated amplifier and is connected, the signal output part Hi of isolated amplifier exports and isolates the signal Signal_out1 after amplifying, and the signal ground end Lo of isolated amplifier connects output in analog.The isolating amplifier circuit of Fig. 2 adopts isolated amplifier to be main amplifier part, direct circuit is not had to be coupled between its input, output and power circuit, namely sensor signal does not have public earth terminal in transmitting procedure, can accomplish ohmic isolation between input circuit and amplifier export.Electrical isolation is carried out to signal and can break ground loop, to avoid producing amplitude common-mode voltage.Preferably, this circuit selects a kind of transformer coupled isolated amplifier AD202 that is general, dual-port as main amplifier part, as a kind of isolated amplifier meeting industrial standard, AD202 can provide a whole set of isolation features, comprise signal isolation and isolated from power, and encapsulate compact, be conducive to the miniaturization realizing product.The proportioning of R1 and R2 realizes attenuation function, and R6 realizes the fine adjustment of multiplication factor, and R3, R4 and R5 achieve zeroing function.Can the output gain of effective conditioning signal by arranging resistance R6, this circuit can also effectively eliminate the measure error caused by ground loop.In the circuit of fig. 2, preferably, R ₁=5k Ω, R ₂=47.5k Ω, R ₆get 0 ~ 5k Ω, R ₃resistance be less than 200 Ω (choosing was worth the common mode coefficient of conference step-down amplifier), R ₄=50k Ω, R ₅=0 ~ 100k Ω, outer meeting resistance is the precision resistance of Low Drift Temperature coefficient.

As shown in Figure 2, in order to eliminate the impact of DC component in high-g level acceleration signal, realizing AC coupled, utilizing the DC component in the characteristic removal signal of " stopping direct current is logical to be exchanged " of electric capacity, and pure AC signal is not affected.Therefore, the design, after isolating amplifier circuit, adds one-level AC coupled.Effectively can eliminate the impact of DC component in high-g level acceleration signal by choosing suitable electric capacity, thus make sensor signal be stabilized in 0V baseline, eliminate the baseline shift that Sensor temperature drift brings.The design selects the tantalum electric capacity C3 of 0.1uF, the signal Signal_out1 after a termination isolation amplification of tantalum electric capacity C3, other end output AC signal Signal_out2.

Because A/D converter acquisition range in fuse is 0-2.5V, and preamplifying circuit exports as differential signal (negativeacceleration is negative value), therefore the design selects operational amplifier to build in-phase adder, make the intermediate value of output signal be the intermediate value (as 1.25V) of A/D converter acquisition range in fuse, be convenient to the acquisition process of subsequent conditioning circuit.As shown in Figure 3, voltage offset electric circuit comprises resistance R7, resistance R8, resistance R11 and the first operational amplifier, the isolation signals Signal_out3 that one end and first voltage follower circuit of resistance R7 export is connected, the other end of resistance R7 is connected with the positive input terminal of the first operational amplifier, one end of resistance R8 is connected with the positive input terminal of the first operational amplifier, another termination power VCC of resistance R8, the negative input end of the first operational amplifier connects in analog by resistance R11, the signal Signal_out4 after the output output offset of the first operational amplifier.Adopt such processing mode that fuse can be made to carry out analog-to-digital conversion easily.

Strike target for different, the signal that transducer can be caused to export doped with certain Noise and Interference, can have a strong impact on signal authenticity.Therefore, need to use filter to carry out anti-aliasing filter to signal, to ensure the correctness of signal, improve system signal noise ratio.Applying unit gain second order voltage controlled voltage source low-pass filter circuit of the present invention, its stable performance, gain easily regulate, and carry out effective filtering according to different striking target to interference and noise.As shown in Figure 4, the low-pass filter circuit that the design adopts utilizes integrated operational amplifier to build unit gain second order voltage controlled voltage source low-pass filter circuit to realize, specifically comprise resistance R9-R10, electric capacity C1-C2 and the second operational amplifier, one end of resistance R9 with biased after signal Signal_out4 be connected, the other end difference connecting resistance R10 of resistance R9, one end of electric capacity C1, the positive input terminal of another termination second operational amplifier of resistance R10, the output of another termination second operational amplifier of electric capacity C1; The positive input terminal of one termination second operational amplifier of electric capacity C2, another termination of electric capacity C2 in analog, the negative input end of the second operational amplifier connects the output of in analog with the second operational amplifier respectively, the low frequency signal Signal_out5 after the output output filtering of the second operational amplifier.The cut-off frequency of filter can be set easily by mating suitable R, C.

By the R of suitable selection ₉, R ₁₀, C ₁, C ₂value can obtain second order Bessel, Butterworth, Chebyshev filter easily.Use Laplace operator S, the transfer function A of this circuit can be drawn _vcfor:

$A_{vc}=\frac{1}{S^2\left(C_1{C}_2{R}_9{R}_{10}\right)+S\[(R_1+R_2)C_2\]+1}---\left(1\right)$

Make denominator polynomials in (1) formula be zero, separate this quadratic equation with one unknown, two limits that can obtain transfer function are:

$S_1,S_2=\frac{-C_2(R_9+R_{10})\±\sqrt{C_2^2{(R_9+R_{10})}^2-4C_1{C}_2{R}_9{R}_{10}}}{2C_1{C}_2{R}_9{R}_{10}}---\left(2\right)$

Definition:

${\mathrm{\ω}}_N=\sqrt{\frac{1}{R_9{R}_{10}{C}_1{C}_2}}---\left(3\right)$

For the characteristic angular frequency of filter function.

Definition:

$f_{cp}=\frac{1}{2\mathrm{\π}}\sqrt{\frac{1}{R_9{R}_{10}{C}_1{C}_2}}---\left(4\right)$

For the cut-off frequecy of passband of filter circuit, then have

ω _N＝2πf _cp(5)

Definition:

$Q=\frac{\sqrt{R_9{R}_{10}{C}_1{C}_2}}{(R_9+R_{10})C_2}---\left(6\right)$

The equivalent quality factor of filter circuit for this reason, numerically it equals f=f _cptime the voltage amplification factor of filter and the ratio of passband voltage gain.If R ₉=R ₁₀, then

$Q=\frac{1}{2}\sqrt{\frac{C_1}{C_2}}---\left(7\right)$

$A_{vc}=\frac{1}{{\left(\frac{S}{{\mathrm{\ω}}_N}\right)}^2+\frac{S}{{\mathrm{Q\ω}}_N}+1}=\frac{{{\mathrm{\ω}}_N}^2}{S^2+\frac{{\mathrm{\ω}}_{N}S}{Q}+{{\mathrm{\ω}}_N}^2}---\left(8\right)$

In order to obtain the frequency response of second order active low pass filter, making the S=j ω in (8) formula, trying to achieve its amplitude-frequency response thus and should be mutually with phase frequency

$\left|A_{vc}\left(j\mathrm{\ω}\right)\right|={\{{\[1-{\left(\frac{\mathrm{\ω}}{{\mathrm{\ω}}_N}\right)}^2\]}^2+\frac{{\mathrm{\ω}}^2}{{\mathrm{\ω}}_N^2{Q}^2}\}}^{-\frac{1}{2}}---\left(9\right)$

$\mathrm{\Φ}\left(\mathrm{\ω}\right)=-\frac{arctg\left(\frac{\mathrm{\ω}}{{\mathrm{Q\ω}}_N}\right)}{1-{\left(\frac{\mathrm{\ω}}{{\mathrm{\ω}}_N}\right)}^2}---\left(10\right)$

Amplitude is taken the logarithm expression, if A ₀for the voltage amplification factor of filter in passband, then

$20\lg \left|\frac{A_{vc}\left(j\mathrm{\ω}\right)}{A_0}\right|=-10\lg {\{{\[1-{\left(\frac{\mathrm{\ω}}{{\mathrm{\ω}}_N}\right)}^2\]}^2+\frac{{\mathrm{\ω}}^2}{{\mathrm{\ω}}_N^2{Q}^2}\}}^{-\frac{1}{2}}---\left(11\right)$

Can be obtained the amplitude-frequency characteristic under different Q value by formula (11), as Q=0.707, amplitude-frequency characteristic is the most smooth, and works as Q>0.707, and near cut-off frequecy of passband, amplitude-versus-frequency curve can upwarp.Q value is larger, and it is more severe that characteristic curve upwarps.Visible, Q value has great importance.

If C ₁, C ₂for finally selected capacitance, C ' ₁, C' ₂for median, C " ₁, C " ₂for primary election value, between them, there is following relation:

$C_1=\frac{C_1^{\′}}{R},C_2=\frac{C_2^{\′}}{R}---\left(12\right)$

This step is called impedance calibration;

$C_1^{\′}=\frac{C_1^{\′\′}}{2{\mathrm{\πf}}_{cp}},C_2^{\′}=\frac{C_2^{\′\′}}{2{\mathrm{\πf}}_{cp}}---\left(13\right)$

This step is called frequency demarcating.

Such as: for the characteristic that certain strikes target, second order Butterworth filter is selected, Q=0.7070, C " ₁=1.414F, C " ₂=0.7071F, cut-off frequency is 10KHz, and through type (13) calculates known,

C′ ₁＝2.25×10 ^-5F，C' ₂＝1.125×10 ^-5F

Make R ₉=R ₁₀=R, chooses C ₁=0.02 μ F, through type (12) calculates known,

$R=\frac{C_1^{\′}}{C_1}=1.125k\mathrm{\Ω},C_2=\frac{C_2^{\′}}{R}=0.01\mathrm{\μ}F.$

Wherein, R ₉, R ₁₀select Mirror Grinding, C ₁, C ₂select mylar electric capacity.Through this filter circuit of verification experimental verification, there is good filtering characteristic and job stability.

Sensor signal is after AC coupled, and series connection voltage order one is followed, and can play the effect of buffering, isolation.Voltage follower circuit has the feature of high input impedance, low output impedance, the work of rear class amplifying circuit can be made more stable, effectively can improve certainty of measurement.As shown in Figure 5, voltage follower circuit is as the buffer stage between whole modulate circuit amplifying circuit and last output stage (before namely conditioned signal enters fuse AD), comprise the 3rd operational amplifier, the positive input terminal of the 3rd operational amplifier is connected with AC signal Signal_out2 or low frequency signal Signal_out5, the negative input end of the 3rd operational amplifier is connected with the output of the 3rd operational amplifier, and the output of the 3rd operational amplifier exports isolation signals Signal_out3 or isolation signals Signal_out.

The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.

Claims (9)

1. a high shock acceleration sensor signal conditioning circuit, is characterized in that, is composed in series successively by isolating amplifier circuit, ac-coupled circuit, the first voltage follower circuit, voltage offset electric circuit, low-pass filter circuit and the second voltage follower circuit, isolating amplifier circuit carries out signal isolation to the transducing signal Signal_in that high shock acceleration sensor exports and amplifies and export the signal Signal_out1 after isolation amplification after isolated from power, output AC signal Signal_out2 after signal Signal_out1 removal DC component after ac-coupled circuit amplifies isolation, first voltage follower circuit to AC signal Signal_out2 carry out buffer compartment from and export low-impedance isolation signals Signal_out3 after reducing output impedance, voltage offset electric circuit obtains the signal Signal_out4 after superposing after superposing direct current signal to isolation signals Signal_out3, low-pass filter circuit carries out low-pass filtering output low frequency signal Signal_out5 to signal Signal_out4, second voltage follower circuit to low frequency signal Signal_out5 carry out buffer compartment from and export low-impedance isolation signals Signal_out after reducing output impedance, described low-impedance isolation signals Signal_out exports to AD converter and processes,

Isolating amplifier circuit comprises resistance R1-R6 and transformer coupled isolated amplifier, transducing signal Signal_in described in resistance R1 mono-termination, the other end respectively with one end of resistance R2, the negative input end of transformer coupled isolated amplifier is connected, the other end of resistance R2 is connected with a stiff end of adjustable resistance R6, another stiff end of adjustable resistance R6 is connected with the feedback end FB of isolated amplifier, the adjustable side of adjustable resistance R6 is connected with a stiff end of described adjustable resistance R6, resistance R3, one end of R4 is connected with the positive input terminal of isolated amplifier respectively, the other end of resistance R3 is connected with the input ground end INCOM of isolated amplifier, input ground end INCOM connects input in analog simultaneously, the other end of resistance R4 is connected with the adjustable side of adjustable resistance R5, one stiff end of zero-regulator resistor R5 is connected with the insulating power supply anode VISO+ of isolated amplifier, another stiff end of zero-regulator resistor R5 is held with the insulating power supply negative terminal VISO-of isolated amplifier and is connected, the signal output part Hi of isolated amplifier exports and isolates the signal Signal_out1 after amplifying, and the signal ground end Lo of isolated amplifier connects output in analog, described low-pass filter circuit is the unit gain second order voltage controlled voltage source low-pass filter circuit utilizing integrated operational amplifier to build.

2. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, is characterized in that: the intermediate value of the signal Signal_out4 after described superposition is the intermediate value of A/D converter acquisition range.

3. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, is characterized in that: high shock acceleration sensor is for exporting acceleration signal during hard goal penetration.

4. high shock acceleration sensor signal conditioning circuit as claimed in claim 4, is characterized in that: described transformer coupled isolated amplifier is AD202.

5. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, it is characterized in that: ac-coupled circuit is made up of tantalum electric capacity C3, signal Signal_out1 after isolation amplification described in one termination of tantalum electric capacity C3, the other end exports described AC signal Signal_out2.

6. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, it is characterized in that: described voltage offset electric circuit comprises resistance R7, resistance R8, resistance R11 and the first operational amplifier, the isolation signals Signal_out3 that one end and first voltage follower circuit of resistance R7 export is connected, the other end of resistance R7 is connected with the positive input terminal of the first operational amplifier, one end of resistance R8 is connected with the positive input terminal of the first operational amplifier, another termination power VCC of resistance R8, the negative input end of the first operational amplifier connects in analog by resistance R11, signal Signal_out4 after the output output offset of the first operational amplifier.

7. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, it is characterized in that: described low-pass filter circuit comprises resistance R9-R10, electric capacity C1-C2 and the second operational amplifier, one end of resistance R9 with biased after signal Signal_out4 be connected, the other end difference connecting resistance R10 of resistance R9, one end of electric capacity C1, the positive input terminal of another termination second operational amplifier of resistance R10, the output of another termination second operational amplifier of electric capacity C1; The positive input terminal of one termination second operational amplifier of electric capacity C2, another termination of electric capacity C2 in analog, the negative input end of the second operational amplifier connects the output of in analog with the second operational amplifier respectively, the low frequency signal Signal_out5 after the output output filtering of the second operational amplifier.

8. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, is characterized in that: R ₉, R ₁₀select Mirror Grinding.

9. high shock acceleration sensor signal conditioning circuit as claimed in claim 1, is characterized in that: C ₁, C ₂select mylar electric capacity.