CN205940708U - Ultrasonic wave level transducer - Google Patents
Ultrasonic wave level transducer Download PDFInfo
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- CN205940708U CN205940708U CN201620858394.9U CN201620858394U CN205940708U CN 205940708 U CN205940708 U CN 205940708U CN 201620858394 U CN201620858394 U CN 201620858394U CN 205940708 U CN205940708 U CN 205940708U
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Abstract
The utility model relates to an ultrasonic wave level transducer, it includes: ultrasonic wave receiving and dispatching probe wherein has temperature sensor, core processing unit, ultrasonic emitting module has the complementary square wave drive H bridge circuit of PWM, high -frequency impulse transformer drive circuit and the probe resonance circuit that connect gradually between core processing unit and ultrasonic wave receiving and dispatching probe, ultrasonic wave receiving module has the automatic gain who connects gradually between ultrasonic wave receiving and dispatching probe and core processing unit and enlargies module, second order filter module and receive the echo module, temperature compensating measured module locates between ultrasonic wave receiving and dispatching probe and the core processing unit, the data output module is connected in core processing unit. Setting through above -mentioned structure for can adopt the built -in temperature sensor adding temperature compensation, compensate velocity of sound be acted upon by temperature changes with this, especially enlarge module and temperature compensating measured module with the help of automatic gain, make measured data have higher stability and higher precision.
Description
Technical field
The present invention relates to a kind of ultrasonic material-level sensor, it is mainly used in arriving using supersonic non-contact measurement sensor
Air line distance between target object, especially can extensive angle, accurately measure the line reflection distance of small non-specular surface object
Ultrasonic material-level sensor.
Background technology
At present, in automatic measurement system, ultrasonic material-level sensor because of non-contacting automatic measurement, and pop one's head in have resistance to
Corrosivity, wider temperature range, almost can measure the thing position of all solids and liquid, for example, can be used for dangerous situation.
Ultrasonic transmission/reception probe is typically piezoelectric type, and it is using the piezoelectric metal piece with piezo-electric effect and potsherd structure
Become, the piezoelectric after polarization issues raw mechanically deform in DC Electric Field, so high frequency voltage can be converted to high frequency
Mechanical oscillation, thus producing the ultrasonic wave of high frequency, likewise, after probe receives ultrasonic activation, also can be by vibration wave
Be converted to electric signal, poorer, because propagation time and propagation distance are to be directly proportional by the timing of driving pulse and reception pulse
, therefore according to the known velocity of sound it is possible to calculate sensor to the air line distance between object being measured.
Because ultrasonic wave is mechanical wave, it is not subject to the radiation interference of the electromagnetic field in the external world and light intensity in communication process, can
With the measurement interference avoiding specific environment to cause, but, in the Propagation of different temperatures, the velocity of sound can change, if not for it
Processed, it is even invalid that measured value will have deviation.
Specifically, spread speed C (m/s) and the relational expression of temperature T (DEG C) are ultrasonic wave in atmosphere：
If the distance of ultrasonic transmission/reception probe is d, the transmission time recording is t (ultrasonic wave two-way time), ultrasonic air
In gas, spread speed is VS, can obtain relational expression is：
The attenuation coefficient computing formula that ultrasonic wave is propagated in atmosphere is：
Ax=Ao*e^ (- α * f*x) (formula 3),
Wherein Ax is the amplitude at the X that pops one's head in, and A0 is the amplitude x at probe is that probe arrives the distance alpha of certain point for decaying
Coefficient, f is vibration frequency.
In sum, existing level transducer, due to the impact to the velocity of sound itself for the Parameters variation in air borne,
The stability of data and certainty of measurement can be led to decline, therefore, its certainty of measurement and stability have much room for improvement.
Utility model content
(1) technical problem to be solved
In order to solve the problems referred to above of prior art, the utility model provides a kind of ultrasonic material-level sensor, and it is permissible
Simple structure, improves certainty of measurement, reduces systematic error.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the utility model adopts include：
A kind of ultrasonic material-level sensor, it includes：
, located at the two ends of pipe axle, three surrounds an accommodation space for pipe axle, top cover and bottom, top cover and bottom；
Circuit board, in accommodation space；
Ultrasonic transmission/reception is popped one's head in, and located at roof side, is connected with circuit board, has TEMP in ultrasonic transmission/reception probe
Device；
Lead, is connected to circuit board, and passes accommodation space by bottom；
Wherein, circuit board has：
Core processing unit；
Ultrasonic wave transmitter module, has the PWM being sequentially connected between core processing unit and ultrasonic transmission/reception probe mutual
Mend square wave and drive H-bridge circuit, high-frequency pulse transformer drive circuit and probe resonance circuit；
Ultrasonic wave receiver module, has the automatic increasing being sequentially connected between ultrasonic transmission/reception probe and core processing unit
Beneficial amplification module, second-order filter module and reception echo module；
Temperature-compensating measurement module, located between ultrasonic transmission/reception probe and core processing unit；
Data outputting module, is connected to core processing unit.
By the setting of said structure so that temperature-compensating can be added using built-in temperature sensor, come more with this
Mend the velocity of sound to be acted upon by temperature changes, especially by automatic gain amplification module and temperature-compensating measurement module so that measuring
Data has higher stability and the precision of Geng Gao.
In an embodiment of the present utility model, threaded between its top cover and pipe axle and ultrasonic transmission/reception probe, and
It is provided with waterproof apron.For example, the ultrasonic transmission/reception probe of top cover can carry external screw thread, can directly rotate and tighten fixation,
Outer edge top cover is tightened stuck, it is to avoid loosening and releasing leads to measurement data inaccurate.
In an embodiment of the present utility model, threaded between its bottom and pipe axle, and be provided with waterproof apron.
In an embodiment of the present utility model, between its lead and bottom, it is provided with screw buckle and fluid sealant, screw
Buckle is arranged at, outside bottom, lead is fixed on bottom, and fluid sealant is arranged inside bottom, makes to be formed between lead and bottom
Waterproof sealing.Whereby, reaching fixed cable increases mechanical strength the effect of energy waterproof.
In an embodiment of the present utility model, the centre frequency of its ultrasonic transmission/reception probe is 69KHz.
In an embodiment of the present utility model, its circuit board is additionally provided with Voltage stabilizing module, is provided with the filter of π type in Voltage stabilizing module
Ripple module, the arrival end of Voltage stabilizing module receives supply input, and first outlet end connects core processing unit provides working power, the
Two ports of export provide the electric energy of excitation pulse for high-frequency pulse transformer drive circuit.
In an embodiment of the present utility model, its automatic gain amplification module includes：
Chopped-off head operational amplifier 15, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 14
13, its inverting input passes through the amplifier pre-resistor 2 being sequentially connected and blocking condenser 1 connects input signal end 12, its
Parallel feedback compensating electric capacity 4 and feedback resistance 5 between inverting input and output end；
Secondary operational amplifier 19, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 18
AVcc_Bias, its inverting input passes through the amplifier pre-resistor 11 being sequentially connected and blocking condenser 17 connects chopped-off head fortune
Calculate the output end of amplifier 15；
Digital regulation resistance chip 9, it is connected to secondary operational amplifier 19 as adjustable resistor provides automatic gain to mend
Repay, its high-end pin RH connects the output end of operational amplifier 19, its low side pin RL and sliding end pin RW is all connected with secondary fortune
Calculate the inverting input of amplifier 19；
Wherein, amplifier end power supply 3 and simulation ground 16 are connected to chopped-off head operational amplifier 15.
Whereby, it is possible to use digital regulation resistance chip 9, according to time of measuring t value, add certainly in secondary operational amplifier 19
Dynamic gain compensation, makes digital regulation resistance chip 9 arrange output resistance by direct proportion, reaches the effect automatically adjusting multiplication factor
Really.
In an embodiment of the present utility model, its second-order filter module includes：
Operational amplifier U1A, its inverting input passes through second-order filter electric capacity A5 and the second-order filter resistance being sequentially connected
A2 accesses echo input signal A1, and the first contact between second-order filter electric capacity A5 and second-order filter resistance A2 is also by frequency modulation electricity
Resistance A13 connects amplifier end center-biased voltage A14, is connected with second order between the output end of operational amplifier U1A and the first contact
It is connected with second-order filter resistance A4 and operational amplifier between the inverting input of filter capacitor A3 and operational amplifier U1A
It is connected with feedback divider resistance A16, the normal phase input end of operational amplifier U1A is also by feedback between the normal phase input end of U1A
Divider resistance A17 connects amplifier end center-biased voltage AVcc_Bias；
Operational amplifier A 19, its inverting input passes through the amplifier end pre-resistor A10 being sequentially connected and interstage coupling electricity
Hold the output end of A7 concatenation operation amplifier U1A, be additionally provided between blocking condenser A7 and amplifier end pre-resistor A10 reversely
Limiter diode A8 in parallel and limiter diode A9, the normal phase input end of operational amplifier A 19 passes through amplifier end biasing resistor
A18 connects amplifier end center-biased voltage AVcc_Bias, is connected between the output end of operational amplifier A 19 and inverting input
There is feedback resistance A11, output signal A12 that echo input signal A1 generates after treatment is via the output of operational amplifier A 19
End output；
Wherein, amplifier end power supply A6 and simulation ground A15 is connected to operational amplifier U1A.
Whereby, clutter noise not only can be filtered, and make single supply amplification echo AC signal undistorted, acceptable
By the limiter diode A8 and limiter diode A9 of reverse parallel connection, further filter out burr so that echo edge judges more
Accurately.
The utility model also provides a kind of ultrasonic material-level sensor, and it includes：
Ultrasonic transmission/reception is popped one's head in, and wherein has temperature sensor；
Core processing unit；
Ultrasonic wave transmitter module, has the PWM being sequentially connected between core processing unit and ultrasonic transmission/reception probe mutual
Mend square wave and drive H-bridge circuit, high-frequency pulse transformer drive circuit and probe resonance circuit；
Ultrasonic wave receiver module, has the automatic increasing being sequentially connected between ultrasonic transmission/reception probe and core processing unit
Beneficial amplification module, second-order filter module and reception echo module；
Temperature-compensating measurement module, located between ultrasonic transmission/reception probe and core processing unit；
Data outputting module, is connected to core processing unit.
By the setting of said structure so that temperature-compensating can be added using built-in temperature sensor, come more with this
Mend the velocity of sound to be acted upon by temperature changes, especially by automatic gain amplification module and temperature-compensating measurement module so that measuring
Data has higher stability and the precision of Geng Gao.
In an embodiment of the present utility model, its automatic gain amplification module includes：
Chopped-off head operational amplifier 15, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 14
13, its inverting input passes through the amplifier pre-resistor 2 being sequentially connected and blocking condenser 1 connects input signal end 12, its
Parallel feedback compensating electric capacity 4 and feedback resistance 5 between inverting input and output end；
Secondary operational amplifier 19, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 18
AVcc_Bias, its inverting input passes through the amplifier pre-resistor 11 being sequentially connected and blocking condenser 17 connects chopped-off head fortune
Calculate the output end of amplifier 15；
Digital regulation resistance chip 9, it is connected to secondary operational amplifier 19 as adjustable resistor provides automatic gain to mend
Repay, its high-end pin RH connects the output end of operational amplifier 19, its low side pin RL and sliding end pin RW is all connected with secondary fortune
Calculate the inverting input of amplifier 19；
Wherein, amplifier end power supply 3 and simulation ground 16 are connected to chopped-off head operational amplifier U1A.
In an embodiment of the present utility model, its second-order filter module includes：
Operational amplifier U1A, its inverting input passes through second-order filter electric capacity A5 and the second-order filter resistance being sequentially connected
A2 accesses echo input signal A1, and the first contact between second-order filter electric capacity A5 and second-order filter resistance A2 is also by frequency modulation electricity
Resistance A13 connects amplifier end center-biased voltage A14, is connected with second order between the output end of operational amplifier U1A and the first contact
It is connected with second-order filter resistance A4 and operational amplifier between the inverting input of filter capacitor A3 and operational amplifier U1A
It is connected with feedback divider resistance A16, the normal phase input end of operational amplifier U1A is also by feedback between the normal phase input end of U1A
Divider resistance A17 connects amplifier end center-biased voltage AVcc_Bias；
Operational amplifier A 19, its inverting input passes through the amplifier end pre-resistor A10 being sequentially connected and interstage coupling electricity
Hold the output end of A7 concatenation operation amplifier U1A, be additionally provided between blocking condenser A7 and amplifier end pre-resistor A10 reversely
Limiter diode A8 in parallel and limiter diode A9, the normal phase input end of operational amplifier A 19 passes through amplifier end biasing resistor
A18 connects amplifier end center-biased voltage AVcc_Bias, is connected between the output end of operational amplifier A 19 and inverting input
There is feedback resistance A11, output signal A12 that echo input signal A1 generates after treatment is via the output of operational amplifier A 19
End output；
Wherein, amplifier end power supply A6 and simulation ground A15 is connected to operational amplifier U1A.
(3) beneficial effect
The beneficial effects of the utility model are：Ultrasonic material-level sensor of the present utility model, it can adopt built-in
Temperature sensor adds temperature-compensating, to make up the velocity of sound with this and to be acted upon by temperature changes, and especially amplifies by automatic gain
Module and temperature-compensating measurement module are so that measurement data has higher stability and the precision of Geng Gao.
Brief description
Fig. 1 is the overall structure diagram of one embodiment of the utility model；
Fig. 2 is the system structure diagram of one embodiment of the utility model；
Fig. 3 is the automatic gain compensation modular circuit structural representation in one embodiment of the utility model；
Fig. 4 is the second order limited range enlargement filter circuit construction schematic diagram in one embodiment of the utility model.
Fig. 5 is the application process schematic diagram of one embodiment of the utility model.
【Description of reference numerals】
E1：Lead；
E2：Bottom；
E3：Circuit board；
E4：Pipe axle；
E5：Top cover；
E6：Ultrasonic transmission/reception is popped one's head in；
1：Blocking condenser；
2：Amplifier pre-resistor；
3：Amplifier end power supply；
4：Feedback compensation electric capacity；
5：Feedback resistance；
6：SDA pin；
7：SCL pin；
8：Digitally；
9：Digital regulation resistance chip；
10：Digital power system power supply；
11：Amplifier pre-resistor；
12：Input signal end；
13：Amplifier end center-biased voltage；
14：Amplifier biasing resistor；
15：Chopped-off head operational amplifier；
16：Simulation ground；
17：Blocking condenser；
18：Amplifier biasing resistor；
19：Secondary operational amplifier；
A1：Echo input signal；
A2：Second-order filter resistance；
A3：Second-order filter electric capacity；
A4：Second-order filter resistance；
A5：Second-order filter electric capacity；
A6：Amplifier end power supply；
A7：Blocking condenser；
A8：Limiter diode；
A9：Limiter diode；
A10：Amplifier end pre-resistor；
A11：Feedback resistance；
A12：Output signal；
A13：Frequency modulation resistance；
A14：Amplifier end center-biased voltage；
A15：Simulation ground；
A16：Feedback divider resistance；
A17：Feedback divider resistance；
A18：Amplifier end biasing resistor；
A19：Operational amplifier.
Specific embodiment
In order to preferably explain the utility model, in order to understand, below in conjunction with the accompanying drawings, by specific embodiment, right
The utility model is described in detail.
Referring to Fig. 2, the ultrasonic material-level sensor of one embodiment of the utility model, it includes：
Ultrasonic transmission/reception probe E6, wherein has temperature sensor；
Core processing unit；
Ultrasonic wave transmitter module, has the PWM being sequentially connected to that core processing unit and ultrasonic transmission/reception are popped one's head between E6
Complementary square wave drives H-bridge circuit, high-frequency pulse transformer drive circuit and probe resonance circuit；
Ultrasonic wave receiver module, have be sequentially connected to ultrasonic transmission/reception pop one's head in automatic between E6 and core processing unit
Gain amplification module, second-order filter module and reception echo module；
Temperature-compensating measurement module, pops one's head between E6 and core processing unit located at ultrasonic transmission/reception；
Data outputting module, is connected to core processing unit.
Wherein it is possible to air line distance between using ultrasonic wave chronometry computation and measurement to testee, that is, sensor is using super
Sound wave transmitting-receiving probe E6 transmitting ultrasonic pulse, ultrasonic pulse is reflected back after reaching object reflecting surface, ultrasonic transmission/reception
Probe E6 receives reflection echo, and completes timing by core processor timer internal to whole cycle, according to the transmission recording
Time, in conjunction with the aerial spread speed of ultrasonic wave, you can is calculated testee and pops one's head in E6's apart from ultrasonic transmission/reception
Distance.Calculated by being internally automatically added to temperature-compensating, the impact to measurement result for the medium parameter change can be efficiently modified,
Especially by automatic gain amplification module and temperature-compensating measurement module so that measurement data has higher stability and more
High precision.
For example, it is possible to selecting wide-range, low blind area, waterproof integral type and carrying the ultrasonic transmission/reception spy of temperature measurement function
Head E6.So as to improving certainty of measurement, reduce systematic error, the measurement field angle of elimination dual probe is less than normal, complex structure and other problems.
For example, the timing accuracy of core processing unit timer internal can be 31.25 nanoseconds, so as to improving measurement essence
Degree.
Specifically, referring to Fig. 3, its automatic gain amplification module includes：
Chopped-off head operational amplifier 15, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 14
13, its inverting input passes through the amplifier pre-resistor 2 being sequentially connected and blocking condenser 1 connects input signal end 12, its
Parallel feedback compensating electric capacity 4 and feedback resistance 5 between inverting input and output end；
Secondary operational amplifier 19, its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor 18
AVcc_Bias, its inverting input passes through the amplifier pre-resistor 11 being sequentially connected and blocking condenser 17 connects chopped-off head fortune
Calculate the output end of amplifier 15；
Digital regulation resistance chip 9, it is connected to secondary operational amplifier 19 as adjustable resistor provides automatic gain to mend
Repay, its high-end pin RH connects the output end of operational amplifier 19, its low side pin RL and sliding end pin RW is all connected with secondary fortune
Calculate the inverting input of amplifier 19；
Wherein, amplifier end power supply 3 and simulation ground 16 are connected to chopped-off head operational amplifier 15.
Wherein, digital regulation resistance chip 9 is also connected with digital power system power supply 10 and digitally 8.Digital regulation resistance chip 9 also sets
There are SCL pin 7 and SDA pin 6, as output end.
In practical application, the echo-signal that ultrasonic transmission/reception probe E6 receives enters into head by blocking condenser 1
The inverting input of level operational amplifier 15, feedback compensation electric capacity 4 eliminates the generation of amplifier self-excitation, chopped-off head operational amplifier 15
Multiplication factor is [- (1+R1/R4)], because ultrasonic wave is attenuated in air borne, adds certainly in secondary operational amplifier 19
Dynamic gain compensation, by time of measuring t value, drives digital regulation resistance chip 9 so as to press direct proportion setting output resistance,
To reach the effect automatically adjusting multiplication factor.
Echo-signal passes through front two stage amplifer, the echo-signal of a few mV levels can be amplified to V level, the wherein interference of doping
Noise waves are also synchronously amplified, in this regard, can by active second-order bandpass filter come filtering clutter noise, specifically, referring to
Fig. 4, its second-order filter module includes：
Operational amplifier U1A, its inverting input passes through second-order filter electric capacity A5 and the second-order filter resistance being sequentially connected
A2 accesses echo input signal A1, and the first contact between second-order filter electric capacity A5 and second-order filter resistance A2 is also by frequency modulation electricity
Resistance A13 connects amplifier end center-biased voltage A14, is connected with second order between the output end of operational amplifier U1A and the first contact
It is connected with second-order filter resistance A4 and operational amplifier between the inverting input of filter capacitor A3 and operational amplifier U1A
It is connected with feedback divider resistance A16, the normal phase input end of operational amplifier U1A is also by feedback between the normal phase input end of U1A
Divider resistance A17 connects amplifier end center-biased voltage AVcc_Bias；
Operational amplifier A 19, its inverting input passes through the amplifier end pre-resistor A10 being sequentially connected and interstage coupling electricity
Hold the output end of A7 concatenation operation amplifier U1A, be additionally provided between blocking condenser A7 and amplifier end pre-resistor A10 reversely
Limiter diode A8 in parallel and limiter diode A9, the normal phase input end of operational amplifier A 19 passes through amplifier end biasing resistor
A18 connects amplifier end center-biased voltage AVcc_Bias, is connected between the output end of operational amplifier A 19 and inverting input
There is feedback resistance A11, output signal A12 that echo input signal A1 generates after treatment is via the output of operational amplifier A 19
End output；
Wherein, amplifier end power supply A6 and simulation ground A15 is connected to operational amplifier U1A.
In concrete application, when its echo centre frequency is 69KHz, can design upper cut off frequency is 72KHz, lower cutoff frequency
Rate is 66KHz, a width of 6KHz of passband band, effectively to filter the clutter noise outside upper lower limiting frequency.
Wherein, center-biased voltage AVcc_Bias is that echo AC signal is undistorted so that single supply amplifies, and it takes
Value can be the 1/2 of amplifier supply voltage.
After second order bandpass filtering, enter into the final stage amplifier electricity adding limiter diode A8 and limiter diode A9
Road, limiting voltage can be 0.7V, to further filter out burr so that echo edge judges more accurate, discharge circuit amplification
Multiple is [- (1+R1/R4)].
Referring to Fig. 1, a preferred embodiment of the present utility model, it also includes：
, located at the two ends of pipe axle E4, three surrounds one and houses for pipe axle E4, top cover E5 and bottom E2, top cover E5 and bottom E2
Space；
Circuit board E3, in accommodation space, ultrasonic transmission/reception probe E6, located at top cover E5 side, is connected with circuit board E3
Connect；
Lead E1, is connected to circuit board E3, and passes accommodation space by bottom E2；
Wherein, core processing unit, ultrasonic wave transmitter module, ultrasonic wave receiver module, temperature-compensating measurement module, data
Output module is arranged at circuit board E3.
Specifically, pipe axle E4 is high-hardness wear-resistant metal material, for the fixing support of whole sensor, overall processing
External member is high-strength corrosion-resisting material, and the integral type ultrasonic transmission/reception probe E6 on top cover E5 carries external screw thread, can be direct
Fixation is tightened in rotation, and outer edge top cover E5 tightens stuck, it is to avoid loosening and releasing leads to probe measurement data inaccurate, i.e. top
Threaded between lid E5 and pipe axle E4 and ultrasonic transmission/reception probe E6, be preferably additionally provided with waterproof apron, bottom E2 and pipe axle
Threaded between E4, preferably also it is provided with waterproof apron.Internal sealing between in figure lead E1 and bottom E2, and outside installation
Screw buckle, playing fixed cable increases mechanical strength energy waterproof action.
Wherein, circuit board E3 is additionally provided with Voltage stabilizing module (being preferably arranged with π type filtration module), externally fed control source
Afterwards, two-way is converted to by Voltage stabilizing module, for numeral and analog device work, another road uses for excitation pulse on a road；At core
Reason unit obtains probe internal temperature data, and direct compensation calculates output data.
Referring to Fig. 5, during concrete application, ultrasonic material-level sensor of the present utility model can run as follows, tool
Body comprises the steps：
S1, startup self-detection；
S2, parameter configuration initialization；
Base timer (SYSTICK) when S3, unlatching；
S4, measuring probe echo time, filtering calculates thing position data；
S5, judge whether to reach timing output data time, if it is not, then returning execution step S4, if so, then execution step
S6；
S6, DMA serial ports sends packet automatically.
Wherein, step S4 includes：
S41, ultrasonic transmission/reception mono- driving of probe E6 prepare；
S42, ultrasonic transmission/reception probe E6 single measurement；
S43, each measurement data are stored in fixing array；
In S44, the array of storage measured value, data integrally moves to right one；
S45, averagely each single shaft array data, composite calulation thing place value.
In sum, ultrasonic material-level sensor of the present utility model, it adds temperature to mend by built-in temperature sensor
Repay, to make up the velocity of sound and to be acted upon by temperature changes；By the ultrasonic transmission/reception probe for 69KHz from centre frequency, it is right to improve
Identification compared with Small object object；By increasing driving power and reducing decay, and add two grades of bandpass filters, filtering clutter
Interference, reduces Echo System noise to greatest extent, more effectively locks acoustic transit time, effectively calculates object spacing, it is right to reduce
Non-specular surface object measure error；By processing end in echo reception, increase automatic gain control circuit, effective compensation is in atmosphere
Echo attenutation caused by propagating, more accurately judges identification measurement distance.
Claims (10)
1. a kind of ultrasonic material-level sensor is it is characterised in that it includes：
, located at the two ends of pipe axle, three surrounds an accommodation space for pipe axle, top cover and bottom, top cover and bottom；
Circuit board, in accommodation space；
Ultrasonic transmission/reception is popped one's head in, and located at roof side, is connected with circuit board, has temperature sensor in ultrasonic transmission/reception probe；
Lead, is connected to circuit board, and passes accommodation space by bottom；
Wherein, circuit board has：
Core processing unit；
Ultrasonic wave transmitter module, has the PWM complementation side being sequentially connected between core processing unit and ultrasonic transmission/reception probe
Ripple drives H-bridge circuit, high-frequency pulse transformer drive circuit and probe resonance circuit；
Ultrasonic wave receiver module, has the automatic gain being sequentially connected between ultrasonic transmission/reception probe and core processing unit and puts
Big module, second-order filter module and reception echo module；
Temperature-compensating measurement module, located between ultrasonic transmission/reception probe and core processing unit；
Data outputting module, is connected to core processing unit.
2. ultrasonic material-level sensor as claimed in claim 1 it is characterised in that：Top cover is visited with pipe axle and ultrasonic transmission/reception
Threaded between head, and it is provided with waterproof apron；And/or threaded between bottom and pipe axle, and it is provided with waterproof apron.
3. ultrasonic material-level sensor as claimed in claim 1 it is characterised in that：Ultrasonic transmission/reception probe centre frequency be
69KHz.
4. ultrasonic material-level sensor as claimed in claim 1 it is characterised in that：It is provided with screw card between lead and bottom
Button and fluid sealant, screw buckle is arranged at, outside bottom, lead is fixed on bottom, and fluid sealant is arranged inside bottom, makes lead
Form waterproof sealing and bottom between.
5. ultrasonic material-level sensor as claimed in claim 1 it is characterised in that：Circuit board is additionally provided with Voltage stabilizing module, voltage stabilizing
It is provided with π type filtration module, the arrival end of Voltage stabilizing module receives supply input, and first outlet end connects core processing list in module
Unit provides working power, and second outlet end provides the electric energy of excitation pulse for high-frequency pulse transformer drive circuit.
6. ultrasonic material-level sensor as claimed in claim 1 is it is characterised in that automatic gain amplification module includes：
Chopped-off head operational amplifier (15), its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor (14)
(13), its inverting input passes through the amplifier pre-resistor (2) being sequentially connected and blocking condenser (1) connects input signal end
(12), parallel feedback compensating electric capacity (4) and feedback resistance (5) between its inverting input and output end；
Secondary operational amplifier (19), its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor (18)
AVcc_Bias, its inverting input passes through the amplifier pre-resistor (11) being sequentially connected and blocking condenser (17) connects head
The output end of level operational amplifier (15)；
Digital regulation resistance chip (9), it is connected to secondary operational amplifier (19) as adjustable resistor provides automatic gain to mend
Repay, its high-end pin RH connects the output end of operational amplifier (19), its low side pin RL and sliding end pin RW are all connected with secondary
The inverting input of operational amplifier (19)；
Wherein, amplifier end power supply (3) and simulation ground (16) are connected to chopped-off head operational amplifier U1A.
7. ultrasonic material-level sensor as claimed in claim 1 is it is characterised in that second-order filter module includes：
Operational amplifier U1A, its inverting input passes through second-order filter electric capacity (A5) and the second-order filter resistance being sequentially connected
(A2) access echo input signal (A1), the first contact between second-order filter electric capacity (A5) and second-order filter resistance (A2) is also logical
Cross frequency modulation resistance R6 and connect amplifier end center-biased voltage AVcc_Bias, the output end of operational amplifier U1A and the first contact it
Between be connected with and be connected with second-order filter resistance between second-order filter electric capacity (A3) and the inverting input of operational amplifier U1A
(A4) it is connected with feedback divider resistance (A16) and the normal phase input end of operational amplifier U1A between, operational amplifier U1A is just
Phase input connects amplifier end center-biased voltage AVcc_Bias also by feedback divider resistance (A17)；
Operational amplifier (A19), its inverting input passes through amplifier end pre-resistor (A10) being sequentially connected and interstage coupling electricity
Hold the output end of (A7) concatenation operation amplifier U1A, also set between blocking condenser (A7) and amplifier end pre-resistor (A10)
There are limiter diode (A8) and the limiter diode (A9) of reverse parallel connection, the normal phase input end of operational amplifier (A19) passes through fortune
Put end biasing resistor (A18) and connect amplifier end center-biased voltage AVcc_Bias, the output end of operational amplifier (A19) with anti-
It is connected with feedback resistance (A11), output signal (A12) warp that echo input signal (A1) generates after treatment between phase input
Output end output by operational amplifier (A19)；
Wherein, amplifier end power supply (A6) and simulation ground (A15) are connected to operational amplifier U1A.
8. a kind of ultrasonic material-level sensor is it is characterised in that it includes：
Ultrasonic transmission/reception is popped one's head in, and wherein has temperature sensor；
Core processing unit；
Ultrasonic wave transmitter module, has the PWM complementation side being sequentially connected between core processing unit and ultrasonic transmission/reception probe
Ripple drives H-bridge circuit, high-frequency pulse transformer drive circuit and probe resonance circuit；
Ultrasonic wave receiver module, has the automatic gain being sequentially connected between ultrasonic transmission/reception probe and core processing unit and puts
Big module, second-order filter module and reception echo module；
Temperature-compensating measurement module, located between ultrasonic transmission/reception probe and core processing unit；
Data outputting module, is connected to core processing unit.
9. ultrasonic material-level sensor as claimed in claim 8 is it is characterised in that automatic gain amplification module includes：
Chopped-off head operational amplifier (15), its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor (14)
(13), its inverting input passes through the amplifier pre-resistor (2) being sequentially connected and blocking condenser (1) connects input signal end
(12), parallel feedback compensating electric capacity (4) and feedback resistance (5) between its inverting input and output end；
Secondary operational amplifier (19), its in-phase input end connects amplifier end center-biased voltage by amplifier biasing resistor (18)
AVcc_Bias, its inverting input passes through the amplifier pre-resistor (11) being sequentially connected and blocking condenser (17) connects head
The output end of level operational amplifier (15)；
Digital regulation resistance chip (9), it is connected to secondary operational amplifier (19) as adjustable resistor provides automatic gain to mend
Repay, its high-end pin RH connects the output end of operational amplifier (19), its low side pin RL and sliding end pin RW are all connected with secondary
The inverting input of operational amplifier (19)；
Wherein, amplifier end power supply (3) and simulation ground (16) are connected to chopped-off head operational amplifier (15).
10. ultrasonic material-level sensor as claimed in claim 8 is it is characterised in that second-order filter module includes：
Operational amplifier U1A, its inverting input passes through second-order filter electric capacity (A5) and the second-order filter resistance being sequentially connected
(A2) access echo input signal (A1), the first contact between second-order filter electric capacity (A5) and second-order filter resistance (A2) is also logical
Cross frequency modulation resistance (A13) and connect amplifier end center-biased voltage (A14), the output end of operational amplifier U1A and the first contact it
Between be connected with and be connected with second-order filter resistance between second-order filter electric capacity (A3) and the inverting input of operational amplifier U1A
(A4) it is connected with feedback divider resistance (A16) and the normal phase input end of operational amplifier U1A between, operational amplifier U1A is just
Phase input connects amplifier end center-biased voltage AVcc_Bias also by feedback divider resistance (A17)；
Operational amplifier (A19), its inverting input passes through amplifier end pre-resistor (A10) being sequentially connected and interstage coupling electricity
Hold the output end of (A7) concatenation operation amplifier U1A, also set between blocking condenser (A7) and amplifier end pre-resistor (A10)
There are limiter diode (A8) and the limiter diode (A9) of reverse parallel connection, the normal phase input end of operational amplifier (A19) passes through fortune
Put end biasing resistor (A18) and connect amplifier end center-biased voltage AVcc_Bias, the output end of operational amplifier (A19) with anti-
It is connected with feedback resistance (A11), output signal (A12) warp that echo input signal (A1) generates after treatment between phase input
Output end output by operational amplifier (A19)；
Wherein, amplifier end power supply (A6) and simulation ground (A15) are connected to operational amplifier U1A.
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| CN201620858394.9U CN205940708U (en) | 2016-08-09 | 2016-08-09 | Ultrasonic wave level transducer |
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| CN201620858394.9U CN205940708U (en) | 2016-08-09 | 2016-08-09 | Ultrasonic wave level transducer |
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| CN108007531A (en) * | 2017-11-28 | 2018-05-08 | 中船重工环境工程有限公司 | A kind of echo signal processing circuit of ultrasonic material level meter |
| CN108871503A (en) * | 2018-09-28 | 2018-11-23 | 伊玛精密电子（苏州）有限公司 | A kind of Intelligent supersonic level sensor |
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| WO2020062934A1 (en) * | 2018-09-28 | 2020-04-02 | 伊玛精密电子（苏州）有限公司 | Intelligent ultrasonic material level sensor |
| CN111600562A (en) * | 2020-05-19 | 2020-08-28 | 浙江威星智能仪表股份有限公司 | Control circuit with continuously adjustable amplification gain |
| CN112129834A (en) * | 2020-09-22 | 2020-12-25 | 江苏师范大学 | Ultrasonic metal corrosion monitoring device and method |
| CN112504427A (en) * | 2020-11-10 | 2021-03-16 | 湖南工商大学 | Ultrasonic wave propagation speed tester under different media based on acoustic circulation method |
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| CN110313184A (en) * | 2017-02-16 | 2019-10-08 | 罗伯特·博世有限公司 | Microphone system with high acoustics overload point |
| CN110313184B (en) * | 2017-02-16 | 2021-11-19 | 罗伯特·博世有限公司 | Microphone system with high acoustic overload point |
| CN108007531A (en) * | 2017-11-28 | 2018-05-08 | 中船重工环境工程有限公司 | A kind of echo signal processing circuit of ultrasonic material level meter |
| CN108007531B (en) * | 2017-11-28 | 2020-12-29 | 中船重工环境工程有限公司 | Echo signal processing circuit of ultrasonic level meter |
| CN108871503A (en) * | 2018-09-28 | 2018-11-23 | 伊玛精密电子（苏州）有限公司 | A kind of Intelligent supersonic level sensor |
| WO2020062934A1 (en) * | 2018-09-28 | 2020-04-02 | 伊玛精密电子（苏州）有限公司 | Intelligent ultrasonic material level sensor |
| CN111600562A (en) * | 2020-05-19 | 2020-08-28 | 浙江威星智能仪表股份有限公司 | Control circuit with continuously adjustable amplification gain |
| CN112129834A (en) * | 2020-09-22 | 2020-12-25 | 江苏师范大学 | Ultrasonic metal corrosion monitoring device and method |
| CN112504427A (en) * | 2020-11-10 | 2021-03-16 | 湖南工商大学 | Ultrasonic wave propagation speed tester under different media based on acoustic circulation method |
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