CN104849496B - A kind of high-impact acceleration detection method and sensor based on principle of corona discharge - Google Patents
A kind of high-impact acceleration detection method and sensor based on principle of corona discharge Download PDFInfo
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Abstract
The present invention proposes a kind of high-impact acceleration detection method and acceleration transducer based on principle of corona discharge, and the place similar with heat convection type acceleration transducer is to be used as " detection mass block " using gas, but testing principle is entirely different：The principle that the present invention causes gas pressure intensity to change and causes corona discharge characteristic to change using acceleration, acceleration is detected eventually through detection discharge current pulse repetition rate.The nuclear structure of the acceleration transducer of the present invention is needle plate corona discharge structure, and construction is succinct, simple process and low cost.High-impact acceleration detection method proposed by the present invention utilizes gas locally micro- ionization feature, fast response time；Acceleration analysis is converted into differential frequency measurement at the same time, direct digitization output, circuit is simple, strong antijamming capability.
Description
Technical field
The present invention relates to sensor technical field, more particularly to a kind of high-impact acceleration detection method and acceleration to pass
Sensor.
Background technology
Acceleration transducer is widely used in the field such as industry, national defence, civilian.Acceleration transducer species is various, according to
Sensing principle is different, mainly there is condenser type, inductance type, pressure resistance type, piezoelectric type, tunnel effect type and heat convection type etc..For big
The high-impact acceleration sensor of the particular applications such as impact, high overload then mainly has pressure resistance type, piezoelectric type, condenser type and heat
Convection type.Non-patent literature 1 [Li Kejie, what Xu, Zhang Zhen sea etc., high-impact acceleration sensor current situation and trend, detection
With controlling journal, 2013,35 (4), 6-10] all kinds of high-impact acceleration sensors are reviewed.Wherein, both at home and abroad
Mainly pressure resistance type, heat convection type and the condenser type high-impact acceleration sensor of commercialization, as ENDEVCO companies of the U.S. produce
7270A series piezoresistive acceleration sensors, range is up to 200,000 g；The serial thermal convection current such as MXA, MXD of the production of MEMSIC companies
Acceleration transducer, highest overload is up to 50,000 g.
Pressure resistance type high-impact acceleration sensor has the solid masses block that can be moved with micro- beam, and structure is relative complex, and
It is affected by temperature larger.Condenser type high-impact acceleration sensor poor linearity, signal processing circuit is complicated, easily by parasitic capacitance
Influence.Heat convection type high-impact acceleration sensor there is no solid detection mass block, but using virtual " hot gas group " as
" mass block ", environmental suitability and impact resistance are stronger.But the type acceleration transducer must integrated heater and temperature
Sensor, structure is relative complex, and detection circuit is relative complex.
The content of the invention
To overcome the shortcoming of prior art, the present invention proposes a kind of high-impact acceleration using principle of corona discharge
Detection method, has the characteristics that cost is low, impact resistance is high, signal detection is simple.
The present invention is achieved through the following technical solutions：
A kind of high-impact acceleration sensor based on principle of corona discharge, the acceleration transducer are single shaft HI high impact
Acceleration transducer, the sensor include direct voltage source #1, direct voltage source #2, current-limiting resistance #1, current-limiting resistance #2, pin
Sharp electrode #1, needlepoint electrode #2, electrode support #1, electrode support #2, plate electrode #1, plate electrode #2, seal cavity,
Sampling resistor #1, sampling resistor #2 and signal deteching circuit；Wherein, the direct voltage source, current-limiting resistance, needlepoint electrode,
Electrode support, plate electrode, sampling resistor form corona discharge structure；The electrode support is electrical insulator, with sealing
Cavity connects, and ensures hermetic seal, forms an annular seal space；Plate electrode #1 and plate electrode #2 is located in annular seal space, described flat
Plate electrode all has hole, and gas can pass freely through；The plate electrode is connected with electrode support；The needlepoint electrode is worn
Logical electrode support simultaneously ensures hermetic seal；The plate electrode by conducting wire and through electrode support draw after with sampling resistor
Connection；The size of current when air gap that the current-limiting resistance is used to limit between needle to board electrode surprisingly punctures completely；The signal
Detection circuit connects sampling resistor #1, sampling resistor #2 respectively, to the Trichel pulse signal of two-way corona discharge structure into
Row detection, and then measure acceleration magnitude.
As a further improvement on the present invention, the signal deteching circuit includes operational amplification circuit #1, operation amplifier electricity
Road #2, shaping circuit #1, shaping circuit #2 and frequency measurement circuit；The signal deteching circuit believes two-way Trichel pulse
Number suitably amplified by operational amplification circuit #1 and operational amplification circuit #2 respectively, then again by shaping circuit #1 and whole
Shape circuit #2 is shaped as square-wave signal, and the difference Δ F of two-way Trichel pulse frequency is finally calculated by frequency measurement circuit,
And then detect the size of acceleration a.
On the other hand, the present invention provides a kind of high-impact acceleration sensor based on principle of corona discharge, the biography
Sensor is three axis high-impact acceleration sensors, and in a hexahedron seal cavity, each face separately designs a set of identical
Corona discharge structure, the corona discharge structure is by direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, tablet electricity
Pole, sampling resistor are formed；The electrode support is electrical insulator, is connected with hexahedron seal cavity, ensures hermetic seal, is formed
One annular seal space；The plate electrode is all located in annular seal space, and the plate electrode all has hole, and gas can freely be worn
Cross；The plate electrode is connected with electrode support；The needlepoint electrode through-electrode supporter simultaneously ensures hermetic seal；It is described flat
Plate electrode is connected after being drawn by conducting wire and through electrode support with sampling resistor；The current-limiting resistance is used to limit pin-plate
Size of current when air gap between electrode surprisingly punctures completely；The signal deteching circuit connects the sampling electricity in each face respectively
Resistance, is detected the Trichel pulse signal of the corona discharge structure in six faces, and then measures adding on three direction of principal axis
Velocity amplitude.
As a further improvement on the present invention, the signal deteching circuit includes operational amplification circuit, shaping circuit and frequency
Rate measuring circuit；The signal deteching circuit is respectively by the two-way Trichel pulse signal of X-axis, Y-axis and Z axis respectively by transporting
Calculate amplifying circuit suitably to be amplified, then square-wave signal is shaped as by shaping circuit again, finally by frequency measurement circuit
The difference Δ F of the two-way Trichel pulse frequency on the axis is calculated, and then detects the size of the acceleration a on the axis.
As a further improvement on the present invention, it is described sealing cavity space filling gas medium, the gas medium be comprising
Electronegative gas.
On the other hand, the present invention provides a kind of high-impact acceleration detection method based on principle of corona discharge, it is special
Sign is：Acceleration transducer of the method based on the present invention, the described method comprises the following steps：
Receive the two-way Trichel pulse signal obtained on sampling resistor；
The Trichel pulse signal is suitably amplified by operational amplification circuit；
Square-wave signal is shaped as by shaping circuit；
Frequency measurement circuit calculates the difference Δ F of two-way Trichel pulse frequency；
According to Δ F；Detect the size of acceleration a.
The beneficial effects of the invention are as follows：High-impact acceleration detection method proposed by the present invention based on principle of corona discharge
And acceleration transducer, the place similar with heat convection type acceleration transducer are to be used as " detection mass block " using gas,
But testing principle is entirely different：The original that the present invention causes gas pressure intensity to change and causes corona discharge characteristic to change using acceleration
Reason, acceleration is detected eventually through detection discharge current pulse repetition rate.The core knot of the acceleration transducer of the present invention
Structure is pin-plate corona discharge structure, and construction is succinct, simple process and low cost.High-impact acceleration detection side proposed by the present invention
Method utilizes gas locally micro- ionization feature, fast response time；Acceleration analysis is converted into differential frequency measurement, directly number at the same time
Wordization exports, and circuit is simple, strong antijamming capability.
Brief description of the drawings
Fig. 1 is the corona discharge structure principle schematic for the negative dc voltage power supply that the present invention is utilized；
Fig. 2 is the corona discharge structure principle schematic for the positive direct-current voltages power supply that the present invention is utilized；
Fig. 3 is the schematic diagram of the single shaft high-impact acceleration sensor of the present invention；
Fig. 4 is the block diagram of the signal deteching circuit of the present invention；
Fig. 5 is the schematic diagram of the three axis high-impact acceleration sensors of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Corona discharge type acceleration transducer that the present invention the designs place similar with heat convection type acceleration transducer is
" detection mass block " is used as using gas；But testing principle is entirely different.Heat convection type acceleration transducer utilizes acceleration
Cause gaseous exchange to change and cause the principle of temperature change, acceleration is detected eventually through detection temperature difference.The present invention
The corona discharge type acceleration transducer of proposition is then to cause gas pressure intensity to change using acceleration and cause corona discharge characteristic
The principle of change, acceleration is detected eventually through detection discharge current frequency.
The principle of corona discharge type high-impact acceleration detection method is as follows：
Corona discharge is a kind of common gas partial ionization electric discharge phenomena, is usually occurred with the small of forceful electric power field distribution
Around radius of curvature energized conductor.Corona discharge has different discharge types according to the difference of configuration.What the present invention utilized puts
Electric form is the Trichel pulse electric discharge (Trichel pulse discharge) in negative DC corona discharge, its knot that discharges
As shown in Figure 1,101 be direct voltage source to structure, and 102 be current-limiting resistance, and 103 be the needlepoint electrode with small radius of curvature, 104
It is plate electrode for electronegative gas gap, 105,106 be sampling resistor, and 107 be signal deteching circuit.Wherein, DC voltage
Source 101 exports negative voltage.The direct voltage source of positive voltage output can also be used, its discharging structure can be changed into such as the institute of attached drawing 2
Show.201 be direct voltage source in attached drawing 2, and 202 be current-limiting resistance, and 203 be plate electrode, and 204 be electronegative gas gap, 205
It is sampling resistor for the needlepoint electrode with small radius of curvature, 206,207 be signal deteching circuit.Shown in attached drawing 1 and attached drawing 2
Discharging structure is different except power supply output polarity, and signal sampling position is different outer, does not have essential distinction in principle.
According to pik criterion (Peek ' s law), corona discharge initial conditions are：
In above formula, EsTo originate electric field, E0It is the ionizing electric field related with gaseous species, for air, E0=30~
32kV/cm, c are the constants related with size, about 0.301cm1/2, m0It is the constant related with needle surface, for smooth table
Face m0=1, r are needle point radius of curvature, and δ is opposing gas density.
Corona inception voltage is represented by：
Vs=Esrln(2d/r) (2)
In above formula, VsFor starting voltage, d is pin-plate spacing.Formula (1) is substituted into formula (2) to obtain：
After configuration is certain, starting voltage V in above formulasThe simply function of opposing gas density δ, i.e. Vs=f (δ).Consider
Opposing gas variable density is not very big, using Taylor's formula, by Vs=f (δ) first approximation at δ=1 is：
Vs=E0m0ln(2d/r)(r+0.5cr3/2)δ+E0m0cln(2d/r)(0.5r3/2-r1/2)=k1δ+b1 (4)
In above formula, k1=E0m0ln(2d/r)(r+0.5cr3/2),b1=E0m0cln(2d/r)(0.5r3/2-r1/2).With respect to gas
Volume density δ is represented by：
In above formula, ρ is gas density, ρ0For gas density under standard conditions, P and T are respectively gas pressure intensity and temperature, P0
And T0Respectively normal pressure and temperature.Starting voltage VsIt can be further expressed as the function of pressure P：
The most important feature of Trichel pulse electric discharge is that discharge current is periodic current impulse, is known as Trichel
Pulse (Trichel pulse).Trichel pulse repetition rate is represented by：
F=k2Va(Va-Vs)/(rd2) (7)
In above formula, F is Trichel pulse repetition rate, k2It is the constant related with electrode structure configuration, VaApplied for outside
Making alive.Formula (6) is substituted into formula (7), Trichel pulse frequency can be expressed as：
In above formula,
As shown in Figure 3,301 be direct voltage source #1 to circuit theory used by the acceleration detection method of the present invention,
302 be current-limiting resistance #1, and 303 be needlepoint electrode #1, and 304 be electrode support #1, and 305 be plate electrode #1, and 306 be connection spiral shell
Nail, 307 be seal cavity, and 308 be needlepoint electrode #2, and 309 be electrode support #2, and 310 be plate electrode #2, and 311 be current limliting
Resistance #2,312 be direct voltage source #2, and 313 be sampling resistor #2, and 314 be sampling resistor #1, and 315 be signal deteching circuit,
316 be gas medium.Wherein, electrode support 304,310 is electrical insulator, and is connected by screw with seal cavity 307, is protected
Hermetic seal is demonstrate,proved, forms an annular seal space.Plate electrode #1 and plate electrode #2 is located in annular seal space, plate electrode #1 and tablet electricity
Pole #2 has hole, and gas can pass freely through.Plate electrode be connected by screw with electrode support (or by Nian Jie,
Ensure sufficiently tight).As long as needlepoint electrode through-electrode supporter simultaneously ensures hermetic seal.Plate electrode passes through conducting wire
And it is connected after being drawn through electrode support with sampling resistor.Conducting wire ensures hermetic seal when passing through electrode support.As it can be seen that
The corona discharge structure shown in two sets of identical attached drawings 1 is included in technical solution shown in attached drawing 3.Can also be by corona discharge knot
Structure is configured to the structure shown in attached drawing 2.
Attached drawing 4 is the block diagram of the signal deteching circuit 315 in attached drawing 3, wherein 401 and 404 be respectively operational amplification circuit #
1 and operational amplification circuit #2,402 and 404 is respectively shaping circuit #1 and shaping circuit #2, and 405 be frequency measurement circuit.
When acceleration is not present in whole airtight cavity, gas pressure intensity difference is uniform, and corona discharge structure #1 and corona are put
The Trichel pulse frequency that electric structure #2 is detected is equal；When airtight cavity is there are during transverse acceleration a, the gas in cavity
It will be redistributed in acceleration effect, and cause the pressure around at needlepoint electrode #1 and needlepoint electrode #2 two to change.Balance
When, it is believed that the pressure difference Δ P at needlepoint electrode #1 and needlepoint electrode #2 two meets relation：
ΔP∝a (9)
And set Δ P=k4A, k4For coefficient.Therefore, when there are during transverse acceleration a, corona discharge structure #1 and corona are put
The Trichel pulse frequency difference Δ F that electric structure #2 is detected is：
Δ F=2k3k4a (10)
That is Trichel pulse difference on the frequency is directly proportional to acceleration, is put by variate corona discharge structure #1 and corona
The difference of the pulse frequency of electric structure #2, can detect that the size of acceleration.
Specific embodiment 1
Attached drawing 3 is the schematic diagram of the single shaft high-impact acceleration sensor of the present invention.Direct voltage source #1 301 and direct current
Voltage source #2 312 is identical direct voltage source, its effect is to provide constant DC voltage.Current-limiting resistance #1 302 and current limliting
Resistance #2 311 is identical resistance, and the electric current that it is acted on when the air gap for being to limit between needle to board electrode surprisingly punctures completely is big
It is small, protect circuit loop.More than Ω grades of the resistance value selection general k of current-limiting resistance.Needlepoint electrode #1 303 and needlepoint electrode #2
308 be identical needlepoint electrode.The material of needlepoint electrode is unlimited, as long as there is the conductive tip of small radius of curvature, such as
Common embroidery draw point or the super tip made of micro-nano technology technique.In corona discharge process, the table of needlepoint electrode
Face shape is most important, flash-over characteristic is influenced very big.From above principle analysis as it can be seen that the most important parameter of needlepoint electrode is bent
Rate radius r.In general, when other conditions are constant, needle point radius of curvature r is smaller, corona inception voltage VsIt is smaller, normal work
When direct voltage source need to provide exterior apply voltage VaIt is smaller.Preferably, needle point radius of curvature r is μm magnitude, or even nm amounts
Level, specific value need to consider.307 material of insulator is unlimited, its main function is electric insulation and cavity sealing.
Plate electrode #1 305 and plate electrode #2 310 is identical plate electrode, and material is unlimited, but requires electrically conductive；
Electrode has the hole in suitable aperture at the same time, it is allowed to which gas medium passes freely through.The size of plate electrode does not limit excessively, no
Corona discharge characteristic can be had an important influence on.Plate electrode size selection generally require according to overall sensor size and pin-
Plate spacing d is determined.Preferably, the dimension of plate electrode should be greater than 10d.Pin-plate spacing d is also the important of influence corona discharge
Parameter.As above principle analysis is understood, it is however generally that, when other conditions are constant, pin-plate spacing d is smaller, starting voltage VsMore
It is small.Preferably, pin-plate spacing d is mm magnitudes, or even μm magnitude, specific value need to consider.
Gas medium 316 is full of whole closed cavity space.The condition that gas medium need to meet is to include electronegative gas, such as
Oxygen O2, sulfur hexafluoride SF6, air etc., typical case's selection is air.In order to increase the sensitivity of acceleration detection, it is contemplated that introduce
The larger gas componant of molecular weight.The selection of initial gas pressure does not limit excessively in confined space, in theory from low pressure
To hyperbar., can from above principle analysis but the size of initial gas pressure has a great influence the characteristic of corona discharge
Know, it is however generally that, when other conditions are constant, initial gas pressure is bigger, starting voltage VsIt is bigger.Initial gas pressure is common to be taken
Being worth need to consider for 1atm (atmospheric pressure), its specific value.
Sampling resistor #1 314 and sampling resistor #2 313 is identical resistance, and it is to obtain spy by sampling resistor that it, which is acted on,
Li Qieer pulse signals, its value can be hundreds of Ω to tens k Ω.Since Trichel electric discharge is that the initial of negative corona discharge is put
Electric form, belongs to faint shelf depreciation, and average discharge current is smaller, generally μ A~mA orders of magnitude, this depends primarily upon electricity
Voltage swing that pole configuring condition (pin-plate spacing size, needle point radius of curvature size) and direct voltage source apply etc..Sampling
The big I of specific resistance value of resistance makes choice according to the capacitance that needle to board electrode in discharge current and discharge loop is formed, with
Just the detection of Trichel pulse current signal is carried out.
As shown in Figure 4, it is acted on mainly to two-way Trichel pulse signal into line frequency signal deteching circuit 315
Measurement.The important feature of Trichel pulse is that rising edge of a pulse is extremely precipitous, and trailing edge is relatively slow, and pulse width is much smaller than arteries and veins
Rush the cycle.In general, pulse width is ns magnitude levels, and the pulse period is μ s magnitudes.Meanwhile Trichel pulse amplitude generally compared with
It is small, it is mV magnitudes.In order to facilitate measurement pulse recurrence frequency, two-way Trichel pulse signal can be passed through operation amplifier respectively
Circuit #1 401 and operational amplification circuit #2 403 are suitably amplified, then again by shaping circuit #1 402 and shaping electricity
Road #2 404 is shaped as square-wave signal, and the difference of two-way Trichel pulse frequency is finally calculated by frequency measurement circuit 405
Δ F, and then can detect that the size of acceleration a.Operational amplification circuit, shaping circuit and frequency measurement circuit in attached drawing 4
Technology realizes difficulty and little, and circuit common designing technique personnel can be designed using the professional knowledge in its field meets that function will
The circuit asked.
Specific embodiment 2
The method according to the invention, it is easy to build three axis high-impact acceleration sensors.In the single shaft electricity shown in attached drawing 3
On the basis of corona formula high-impact acceleration sensor, it is easy to build 3-axis acceleration sensor.In a hexahedron cavity
Interior, each face separately designs a set of identical corona discharge structure, and the opposite face of each two respectively constitutes three directions of x, y, z
Acceleration analysis.Attached drawing 5 is a kind of form of three axis corona discharge type high-impact acceleration sensors, and six faces are only depicted in figure
Four faces (x and z directions) in body at the same dispensed other circuit parts (circuit part per one side is identical with attached drawing 3,
The port number increase of signal deteching circuit is 6).501 be needlepoint electrode #1, and 502 be electrode support #1, and 503 be tablet electricity
Pole #1,504 be attachment screw, and 505 be hexahedron support frame, and 506 be needlepoint electrode #2, and 507 electrode support #2,508 are
Plate electrode #2,509 be needlepoint electrode #3, and 510 be electrode support #3, and 511 be plate electrode #3, and 512 be needlepoint electrode #4,
513 be electrode support #4, and 514 be plate electrode #4.515 be gas medium.Wherein, 503 plate electrode #1,508 tablets electricity
All plate electrodes such as pole #2,511 plate electrode #3,514 plate electrode #4 are respectively provided with hole, it is allowed to which gas passes freely through.It is flat
Plate electrode is connected by screw (or by Nian Jie, guarantee is sufficiently tight) with electrode support.All electrode supports are
Electrical insulator, and be connected by screw with hexahedron support frame, while ensure hermetic seal.As long as all needlepoint electrode break-through electricity
Pole supporter simultaneously ensures hermetic seal.
The nuclear structure for the high-impact acceleration sensor that the present invention designs is pin-plate corona discharge structure, and construction is succinct,
Simple process and low cost.High-impact acceleration detection method proposed by the present invention utilizes the micro- ionization feature of gas, response speed
It hurry up；Acceleration analysis is converted into differential frequency measurement at the same time, direct digitization output, circuit is simple, strong antijamming capability.
Above content is that a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (4)
1. a kind of high-impact acceleration sensor based on principle of corona discharge, it is characterised in that the sensor includes direct current
Voltage source #1, direct voltage source #2, current-limiting resistance #1, current-limiting resistance #2, needlepoint electrode #1, needlepoint electrode #2, electrode support #
1st, electrode support #2, plate electrode #1, plate electrode #2, seal cavity, sampling resistor #1, sampling resistor #2 and signal inspection
Slowdown monitoring circuit；Wherein, the direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor are formed
Corona discharge structure；The electrode support is electrical insulator, is connected with seal cavity, ensures hermetic seal, forms a sealing
Chamber；Plate electrode #1 and plate electrode #2 is located in annular seal space, and the plate electrode all has hole, and gas can freely be worn
Cross；The plate electrode is connected with electrode support；The needlepoint electrode through-electrode supporter simultaneously ensures hermetic seal；It is described flat
Plate electrode is connected after being drawn by conducting wire and through electrode support with sampling resistor；The current-limiting resistance is used to limit pin-plate
Size of current when air gap between electrode surprisingly punctures completely；The signal deteching circuit connects sampling resistor #1, adopts respectively
Sample resistance #2, is detected the Trichel pulse signal of two-way corona discharge structure, and then measures acceleration magnitude, specifically
Ground, the signal deteching circuit include operational amplification circuit #1, operational amplification circuit #2, shaping circuit #1, shaping circuit #2 and
Frequency measurement circuit；Two-way Trichel pulse signal is passed through operational amplification circuit #1 and fortune by the signal deteching circuit respectively
Calculate amplifying circuit #2 suitably to be amplified, be then shaped as square-wave signal by shaping circuit #1 and shaping circuit #2 again, finally
The difference Δ F of two-way Trichel pulse frequency is calculated by frequency measurement circuit, and then detects the size of acceleration a.
2. a kind of high-impact acceleration sensor based on principle of corona discharge, the sensor passes for three axis high-impact accelerations
Sensor, it is characterised in that in a hexahedron seal cavity, each face separately designs a set of identical corona discharge structure,
The corona discharge structure is by direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor structure
Into；The electrode support is electrical insulator, is connected with hexahedron seal cavity, ensures hermetic seal, forms an annular seal space；Institute
State plate electrode to be all located in annular seal space, the plate electrode all has hole, and gas can pass freely through；The plate electrode
It is connected with electrode support；The needlepoint electrode through-electrode supporter simultaneously ensures hermetic seal；The plate electrode passes through conducting wire
And it is connected after being drawn through electrode support with sampling resistor；The current-limiting resistance is used to limit the air gap between needle to board electrode
Size of current during unexpected breakdown completely；The signal deteching circuit connects the sampling resistor in each face respectively, to six faces
The Trichel pulse signal of corona discharge structure is detected, and then measures the acceleration magnitude on three direction of principal axis, specifically,
The signal deteching circuit includes operational amplification circuit, shaping circuit and frequency measurement circuit；The signal deteching circuit difference
The two-way Trichel pulse signal of X-axis, Y-axis and Z axis is suitably amplified by operational amplification circuit respectively, is then passed through again
Cross shaping circuit and be shaped as square-wave signal, the two-way Trichel pulse frequency on the axis is finally calculated by frequency measurement circuit
The difference Δ F of rate, and then detect the size of the acceleration a on the axis.
3. high-impact acceleration sensor according to claim 1 or 2, it is characterised in that：The sealing cavity space filling
Gas medium, the gas medium are to include electronegative gas.
A kind of 4. high-impact acceleration detection method based on principle of corona discharge, it is characterised in that：The method is used as weighed
Profit requires 1-3 any one of them acceleration transducers, the described method comprises the following steps：
Receive the two-way Trichel pulse signal obtained on sampling resistor；
The Trichel pulse signal is suitably amplified by operational amplification circuit；
Square-wave signal is shaped as by shaping circuit；
Frequency measurement circuit calculates the difference Δ F of two-way Trichel pulse frequency；
According to Δ F；Detect the size of acceleration a.
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| CN201673169U (en) * | 2010-05-05 | 2010-12-15 | 襄阳精鑫电子设备制造有限公司 | Signal converting circuit of capacitance type acceleration transducer |
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| JPH067344B2 (en) * | 1987-06-24 | 1994-01-26 | 株式会社 エイ・ティ・ア−ル自動翻訳電話研究所 | Speech recognition method using vector quantization |
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|---|---|---|---|---|
| GB1170067A (en) * | 1966-10-24 | 1969-11-12 | North American Aviation Inc | Accelerometer |
| SU492814A1 (en) * | 1974-04-18 | 1975-11-25 | Московский вечерний металлургический институт | Sensor acceleration "inplatron" |
| CN201673169U (en) * | 2010-05-05 | 2010-12-15 | 襄阳精鑫电子设备制造有限公司 | Signal converting circuit of capacitance type acceleration transducer |
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