CN215986133U

CN215986133U - Measurement and calibration system for improving precision of ultrasonic wind sensor

Info

Publication number: CN215986133U
Application number: CN202121773246.4U
Authority: CN
Inventors: 王险峰; 崔磊
Original assignee: Suzhou Swift Hi Tech Co ltd
Current assignee: Suzhou Swift Hi Tech Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-03-08
Anticipated expiration: 2031-07-30

Abstract

The application discloses improve measurement and calibration system of ultrasonic wave wind sensor precision includes: high-voltage pulse circuit unit, send out the switch, send out the transducer, receive switch, receiving circuit unit, high-voltage pulse circuit unit output connects and sends out the switch input end, send out the switch output and connect and send out the transducer, receive the switch respectively with send out the transducer, receive the transducer output and be connected, the receiving circuit unit is connected to the output of receiving the switch. The method and the device have the advantages that the hysteresis is configured into the equipment as the factory parameters, so that the measurement precision is improved, and the use complexity is reduced. When the environmental temperature changes, high-precision measurement can be maintained only by fine adjustment of the working frequency; the real-time measurement of the frequency is of a concomitant nature and does not affect the current wind speed and direction measurement.

Description

Measurement and calibration system for improving precision of ultrasonic wind sensor

Technical Field

The application relates to the technical field of sensors, in particular to a measurement and calibration system for improving the precision of an ultrasonic wind sensor.

Background

The commonly used ultrasonic wind sensors are classified into two types, one is a transit type, and the other is a resonant cavity type. Transit-type ultrasonic wind speed and direction sensors typically have four ultrasonic transducers and three transducers, which are somewhat different in algorithm but consistent in transit time measurements in each direction.

For example, taking a direct correlation type of four transducers as an example, the four transducers respectively correspond to four directions of east, west, south and north, during measurement, transit time from north to south is measured, and then transit time from south to north is measured, a transmission distance is determined by a structure, a component wind speed from north to south is a final value required to be measured by a sensor, and the accuracy of the component wind speed depends on the measurement accuracy of the transit time. The measurement error with small lag time can cause the error with larger component wind speed, so how to solve the error caused by lag is the key for improving the precision of the ultrasonic wind sensor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a measurement and calibration system for improving the precision of an ultrasonic wind sensor, and the precision of the ultrasonic wind sensor is improved by solving the error caused by hysteresis.

The embodiment of the application provides a measurement and calibration system for improving accuracy of an ultrasonic wind sensor, which comprises: high-voltage pulse circuit unit, send out the switch, send out the transducer, receive switch, receiving circuit unit, high-voltage pulse circuit unit output connects and sends out the switch input end, send out the switch output and connect and send out the transducer, receive the switch respectively with send out the transducer, receive the transducer output and be connected, the receiving circuit unit is connected to the output of receiving the switch.

Preferably, send switch, receive the switch and include central controller, signal detection module, timing chip, on-off control circuit, central controller is connected with signal detection module, timing chip, on-off control circuit electricity, on-off control circuit is electronic switch chip or MOS switch tube, and central controller is singlechip or ARM treater, and signal detection module includes signal amplification, AD converting circuit, and the timing chip is the clock chip.

Preferably, the signal detection modules of the sending switch and the receiving switch are electrically connected with a timing trigger pin of the timing chip.

Preferably, the switch control circuit of the power switch is electrically connected with the power transducer.

Preferably, the switch control circuit of the receiving switch comprises two on-off control circuits, and the two on-off control circuits are respectively electrically connected with the transmitting transducer and the receiving transducer.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

1) the method and the device have the advantages that the hysteresis is configured into the equipment as the factory parameters, so that the measurement precision is improved, and the use complexity is reduced.

2) When the environmental temperature changes, high-precision measurement can be maintained only by finely adjusting the working frequency;

3) the real-time measurement of the frequency is of a concomitant nature and does not affect the current wind speed and direction measurement.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic block diagram of a transducer test using a frequency sweep approach;

FIG. 2 is a schematic block diagram of a measurement and calibration system for improving the accuracy of an ultrasonic wind sensor according to the present application;

FIG. 3 is a detailed schematic block diagram of a send switch and a receive switch of a measurement and calibration system for improving the accuracy of an ultrasonic wind sensor according to the present invention;

FIG. 4 is a schematic block diagram illustrating a connection between a transmitter switch and a peripheral module of a measurement and calibration system for improving the accuracy of an ultrasonic wind sensor according to the present invention;

fig. 5 is a schematic block diagram illustrating a connection between a switch and a peripheral module of a measurement and calibration system for improving accuracy of an ultrasonic wind sensor according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

The conventional transducer is tested by adopting a frequency sweep mode, and the principle is as shown in figure 1. Firstly, a switch is communicated with a high-voltage pulse generator and an energy converter, the pulse number, the amplitude and the frequency parameters of the high-voltage pulse generator are adjusted and started, then the switch is communicated with the energy converter and an oscilloscope channel, the reflected signal received by the energy converter is observed, the process is repeated by changing the frequency, and the corresponding frequency point when the amplitude is maximum is found out, wherein the frequency point is the frequency of the energy converter. The actual frequency sweep test requires hardware circuit support to operate, and this is just one principle.

For ultrasonic wind speed and direction sensor equipment, the frequency of a transducer cannot be measured by using the frequency sweeping mode, firstly, hardware such as a reflecting plate is lacked, if the transducer close to the opposite side reflects, the signal amplitude is too small to be basically identified, and in addition, the equipment does not have time to measure the frequency during working, and for the equipment, frequency measurement in a following mode needs to be developed. That is, the frequency measurement cannot affect the normal wind speed and direction measurement.

The embodiment of the present application provides a measurement and calibration system for improving the accuracy of an ultrasonic wind sensor as described above, as shown in fig. 2, including: the high-voltage pulse circuit comprises a high-voltage pulse circuit unit, a sending switch, a sending transducer, a receiving switch and a receiving circuit unit, wherein the output end of the high-voltage pulse circuit unit is connected with the input end of the sending switch, the output end of the sending switch is connected with the sending transducer, the receiving switch is respectively connected with the output ends of the sending transducer and the receiving transducer, and the output end of the receiving switch is connected with the receiving circuit unit. The high-voltage pulse circuit unit is an ultrasonic generator, and the receiving circuit unit is a display screen, an oscilloscope or other signal testing instruments for displaying ultrasonic signals.

As shown in fig. 2, when the transit time between the transducer and the transducer is tested, the transmitting switch connects the high-voltage pulse circuit unit to the transducer, the receiving switch connects the receiving circuit unit to the transducer, the high-voltage pulse signal of the high-voltage pulse circuit unit triggers the timing chip to start timing, the high-voltage pulse signal receiving end of the receiving switch triggers the timing chip to stop timing, and the time difference between the stop timing and the start timing is the transit time between the transducer and the transducer.

Meanwhile, a certain time is required for the ultrasonic pulse to emit the ultrasonic wave from the transducer to the transducer, and the time is related to the temperature, the wind speed and the structure size.

When the frequency of the transmitting transducer is tested and calculated, the transmitting switch is communicated with the high-voltage pulse circuit unit to the transmitting transducer, the receiving switch is communicated with the receiving transducer to the receiving circuit unit, after the high-voltage electric pulse series excitation sent by the high-voltage pulse circuit unit is completed, the transmitting switch is disconnected from the transmitting transducer, the receiving switch is communicated with the transmitting transducer to the receiving circuit unit, and the receiving circuit unit calculates the frequency f of the transmitting transducer according to the zero crossing interval of the received signals₀At the frequency f of the transducer₀After the measurement, the development transducer is turned off, the receiving transducer is connected to the receiving circuit unit, and then the normal transit time measurement is carried out. The frequency measurement principle of other transducers is the same, and is not described in detail here.

As shown in fig. 3, the sending switch and the receiving switch include a central controller, a signal detection module, a timing chip, and a switch control circuit, the central controller is electrically connected to the signal detection module, the timing chip, and the switch control circuit, the switch control circuit is an electronic switch chip or an MOS switch tube, the central controller is a single chip or an ARM processor, the signal detection module includes a signal amplification circuit and an AD conversion circuit, and the timing chip is a clock chip. The central controller sends control signals to the switch control circuit according to corresponding parameters obtained by the signal detection module and the timing chip, so that the transit time measurement or the frequency test of the transducer is realized.

As shown in fig. 4 and 5, the signal detection modules of the transmitting switch and the receiving switch are electrically connected to the timing trigger pin of the timing chip, when the transmitting switch and the receiving switch measure the transit time of the transmitting transducer to the receiving transducer, the timing trigger pin of the timing chip of the transmitting switch collects the signal transmitting time of the transmitting transducer through the signal detection module and starts timing, the timing trigger pin of the timing chip of the receiving switch collects the signal receiving time of the receiving transducer through the signal detection module and stops timing, and the time difference between the stop timing and the start timing is the transit time.

The switch control circuit of the transmitting switch is used for controlling the on-off of the high-voltage pulse circuit unit and the transmitting transducer, and the switch control circuit of the receiving switch is used for controlling the on-off of the receiving circuit unit and the transmitting transducer or the receiving transducer, and is respectively used for measuring the transit time of the transmitting transducer to the receiving transducer and the frequency of the transmitting transducer. As shown in fig. 5, the

ends

1 and 2 of the switch control circuit of the receiving switch are respectively connected with the receiving transducer and the transmitting transducer, and the signals of different transducers are received by

gating

1, 3 or 2 and 3.

The specific test process is as follows:

when the transit time of the transducer to the transducer is tested, the central controller of the transducer controls the switch control circuit to be communicated with the high-voltage pulse circuit unit to the transducer, the central controller of the receiving switch controls the switch control circuit to be communicated with the receiving circuit unit to the transducer, the high-voltage pulse string sent by the high-voltage pulse circuit unit is detected by the signal detection module, and then the central controller of the transducer controls the timing chip to start timing. When the receiving circuit unit receives the pulse electric signal, the central controller of the receiving switch controls the timing chip to stop timing, and the time difference between the stop timing and the start timing is the transit time of the transmitting transducer and the receiving transducer.

The transducer according to the above does not stop its oscillation immediately after the end of the high voltage electrical pulse, and has a long aftershock, which is exactly the frequency of the transducer, independent of the frequency of the excited electrical pulse. Thus, the transducer frequency test procedure is as follows.

When the clock chip of the power switch detects that the series excitation of the high-voltage electric pulses sent by the high-voltage pulse circuit unit is completed, the central controller of the power switch controls the switch control circuit to break and develop the transducer, the oscillation of the transducer cannot stop immediately, and long-time aftershock exists, and the frequency of the aftershock is just the frequency of the transducer.

The central controller of the receiving switch controls the switch control circuit to connect the transmitting transducer to the receiving circuit unit, and the receiving circuit unit calculates the frequency f of the transmitting transducer according to the zero crossing point time interval of the received signal₀Since the zero crossing is spaced in time by the time T of one period of the aftershock signal, the transducer frequency f₀The relationship to this cycle time T is: f. of₀＝1/T。

At the frequency f of the transducer₀After the measurement, the development transducer is turned off, the receiving transducer is connected to the receiving circuit unit, and then the normal transit time measurement is carried out. The frequency measurement principle of other transducers is the same, and is not described in detail here.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A measurement and calibration system for improving the accuracy of an ultrasonic wind sensor, comprising: high-voltage pulse circuit unit, send out the switch, send out the transducer, receive switch, receiving circuit unit, high-voltage pulse circuit unit output connects and sends out the switch input end, send out the switch output and connect and send out the transducer, receive the switch respectively with send out the transducer, receive the transducer output and be connected, the receiving circuit unit is connected to the output of receiving the switch.

2. The system of claim 1, wherein the transmitting switch and the receiving switch comprise a central controller, a signal detection module, a timing chip and a switch control circuit, the central controller is electrically connected with the signal detection module, the timing chip and the switch control circuit, the switch control circuit is an electronic switch chip or an MOS switch tube, the central controller is a single chip microcomputer or an ARM processor, the signal detection module comprises a signal amplification and AD conversion circuit, and the timing chip is a clock chip.

3. The system for measuring and calibrating the accuracy of the ultrasonic wind sensor according to claim 2, wherein the signal detection modules of the sending switch and the receiving switch are electrically connected with the timing trigger pin of the timing chip.

4. A measurement and calibration system for improving the accuracy of an ultrasonic wind sensor according to claim 2, wherein the switch control circuit of the hair switch is electrically connected to the hair transducer.

5. The system for measuring and calibrating the accuracy of the ultrasonic wind sensor according to claim 2, wherein the switch control circuit of the receiving switch comprises two on-off control circuits, and the two on-off control circuits are electrically connected with the transmitting transducer and the receiving transducer respectively.