CN202956167U

CN202956167U - Ultrasonic level meter with function of multi-range adaption

Info

Publication number: CN202956167U
Application number: CN 201220576862
Authority: CN
Inventors: 李长奇; 刘猛; 陈维琨; 徐志山; 高明璋; 杨彬
Original assignee: Zhonghuan TIG Co Ltd
Current assignee: Zhonghuan TIG Co Ltd
Priority date: 2012-11-05
Filing date: 2012-11-05
Publication date: 2013-05-29
Anticipated expiration: 2022-11-05

Abstract

The utility model relates to an ultrasonic level meter with the function of multi-range adaption. The ultrasonic level meter is formed by connecting a single-chip microcomputer module, an ultrasonic transmitting module, an ultrasonic transducer and an AD (analog/digital) conversion module. The single-chip microcomputer module scans and transmits pulse of certain frequency through an IO (input/output) interface and controls the ultrasonic transmitting module to generate high-voltage ultrasonic an excitation signal so as to excite the ultrasonic transducer to transmit ultrasonic wave, and an ultrasonic echo signal is converted into an electrical signal by the ultrasonic transducer, amplitude of the echo signal is measured by the AD conversion module and is transmitted to the single-chip microcomputer module, and pulse frequency corresponding to the maximum signal amplitude is calculated by the single-chip microcomputer module and is determined as ultrasonic transmission frequency, and accordingly multi-range adaptation of the ultrasonic level meter is achieved. The ultrasonic level meter guarantees the transmission frequency to be consistent to resonant frequency of the transducer, a same program is enabled to self-recognize and adapt to the multi-range ultrasonic transducer, and replacement of the transducers for field debugging of meters is more facilitated by the aid of batch production and interchange of the ultrasonic transducers.

Description

A kind of ultrasonic level gage with multirange adaptation function

Technical field

The utility model relates to ultrasonic level gage, relates in particular to a kind of ultrasonic level gage with multirange adaptation function.

Background technology

The system of current ultrasonic level gage mostly adopts sets ultrasound wave emission receive frequency, to adapt to ultrasonic transducer, realizes the fixedly level gauging of range.This simple system, when production, needs according to the supersonic transducer frequency of selecting, and by button, ultrasound wave emission receive frequency is set, or adopts the software of programming different frequency to realize.This method, complicated operation, be unfavorable for batch production, is unfavorable for the exchange of circuit and transducer, is unfavorable for field adjustable replacing transducer.

Above-mentioned some be insoluble problem all the time in the ultrasonic level gage product.

Summary of the invention

Deficiency in view of the prior art existence, the utility model purpose is to provide a kind of system design scheme with ultrasonic level gage of multirange adaptation function, make system can measure voluntarily the resonance frequency of ultrasonic transducer, and automatically set best ultrasound wave emission receive frequency, automatically adapt to the ultrasonic transducer of different ranges.

For achieving the above object, the utility model is to realize by such technical scheme: a kind of ultrasonic level gage with multirange adaptation function is characterized in that: by one-chip computer module, ultrasound wave transmitter module, ultrasonic transducer and AD modular converter, connected and composed.

The beneficial effects of the utility model are: have the multirange adaptation function ultrasonic level gage this can automatically test the resonance frequency of ultrasonic transducer, guarantee that hyperacoustic transmission frequency is consistent with the transducer resonance frequency, make same program can identify voluntarily and adapt to the ultrasonic transducer of multiple range, be beneficial to the batch production of ultrasonic level gage and the exchange of ultrasonic transducer, and it is more convenient to change transducer during the field adjustable instrument.

The accompanying drawing explanation

Fig. 1 is circuit block diagram of the present utility model;

Fig. 2 is software flowing chart are of the present utility model;

Fig. 3 is application example circuit diagram of the present utility model;

Fig. 4 is application example algorithm flow chart of the present utility model.

Embodiment

Understand the utility model for clearer, describe in conjunction with the accompanying drawings and embodiments the utility model in detail:

As shown in Figure 1, ultrasonic level gage with multirange adaptation function is comprised of one-chip computer module, ultrasound wave transmitter module, ultrasonic transducer and AD modular converter, wherein one-chip computer module is launched certain frequency pulsed drive ultrasound wave transmitter module, the excitation ultrasonic transducer sends ultrasonic signal, the AD modular converter is measured the ultrasonic echo signal, and pass to one-chip computer module, calculated the resonance frequency of ultrasonic transducer by single-chip microcomputer, it is defined as to the ultrasound wave transmission frequency, realizes ultrasonic level gage multirange adaptation function.

Figure 2 shows that software flowing chart are of the present utility model, the minimum transmission frequency f of single-chip microcomputer initialization ₀With highest frequency f ₁, it is f that transmission frequency is arranged to f ₀, the emission ultrasonic signal, then measure the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased to 0.2kHz, judge whether transmission frequency f is greater than highest frequency f ₁If be not more than f ₁, continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased to 0.2k, until transmission frequency f is greater than highest frequency f ₁, then search array a[i] and middle maximum amplitude, determine that the maximum amplitude respective frequencies is transmission frequency.

This algorithm starts to launch ultrasonic signal from minimum transmission frequency, and synchronous recording echoed signal amplitude, each emission stepping 0.2kHz, until high emission frequency, the characteristics of utilizing ultrasound wave to transmit with the resonance frequency phase synchronous signal maximum of ultrasonic transducer, when echo is maximum, corresponding frequency is decided to be the standard emission frequency, thereby has realized the self-adaptation of different range ultrasonic transducers.

Figure 3 shows that the utility model one application example circuit diagram, the one-chip computer module master chip adopts the MSP430F149 chip, this chip adopts the 3.3V power voltage supply, major clock can reach 8MHz, and thering is the AD translation function, single-chip microcomputer is sent into the ultrasound wave transmitter module by the pulse of IO mouth emission certain frequency; The pulse that the ultrasound wave transmitter module is 15V by triode 2N3906 by the pulses switch of 3.3V, then control the on off state of field effect transistor IRFZ34, the driving transformer coil, produce the high pressure pumping signal of 1000Vpp, and encourage ultrasonic transducer with this signal; Ultrasonic transducer produces ultrasound wave by the high pressure pumping signal, and the ultrasonic echo signal is converted to electric signal sends into the AD modular converter; The AD modular converter is isolated signal by operational amplifier MAX4332 chip, by diode 1N4148 detection, the peak-peak of ultrasonic signal is latched on electric capacity, and it is sent into to one-chip computer module and carry out the AD conversion.

Fig. 4 is the utility model one application example algorithm flow chart, the minimum transmission frequency f of single-chip microcomputer initialization ₀For 20kHz and highest frequency f ₁For 60kHz, it is f that transmission frequency is arranged to f ₀, the emission ultrasonic signal, then call the AD transfer function, by AD, changes, and measures the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased to 0.2kHz, judge whether transmission frequency f is greater than highest frequency f ₁If be not more than f ₁, continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased to 0.2k, until transmission frequency f is greater than highest frequency f ₁, then, by sequencer program, search array a[i] and middle maximum amplitude, the maximum amplitude respective frequencies is set as to transmission frequency.Thereby completed in 20kHz to 60kHz band limits the self-adaptation of ultrasound wave transmission frequency.This section algorithm can be applied to multiple range ultrasonic level gage in 20kHz to 60kHz scope.

According to the above description, can realize scheme of the present utility model in conjunction with art technology.

Claims

1. the ultrasonic level gage with multirange adaptation function, connected and composed by one-chip computer module, ultrasound wave transmitter module, ultrasonic transducer and AD modular converter, it is characterized in that: described one-chip computer module adopts the MSP430F149 chip; The ultrasound wave transmitter module is connected and composed by triode 2N3906, field effect transistor IRFZ34, transformer and Resistor-Capacitor Unit; The AD modular converter is connected and composed by operational amplifier MAX4332, diode 1N4148 and Resistor-Capacitor Unit.