阅读说明：本技术 一种便携式超声波测厚仪 (Portable ultrasonic thickness gauge ) 是由 马驰 朱悦 张鹏 于 2018-07-15 设计创作，主要内容包括：一种便携式超声波测厚仪,属于传感器检测技术领域,是主要由探头、超声波发射电路、超声波接收电路、单片机、计数器电路、键盘模块、液晶显示模块、储存及时钟电路和通信模块组成的,其特征在于：所述探头和超声波发射电路相连接,超声波接收电路和探头相连接,超声波发射电路和超声波接收电路均与单片机相连接,单片机和计数器电路相连接,计数器电路与超声波接收电路相连接,本发明具有体积小、操作方便等优点,可实现精确测量,而且还具有可编程功能,可以存储大量的信息,能够满足工厂日常检测的要求。(The utility model provides a portable ultrasonic thickness gauge, belongs to sensor detection technical field, is mainly by probe, ultrasonic emission circuit, ultrasonic receiving circuit, singlechip, counter circuit, keyboard module, liquid crystal display module, store and clock circuit and communication module constitute, its characterized in that: the ultrasonic detection device has the advantages of small volume, convenience in operation and the like, can realize accurate measurement, has a programmable function, can store a large amount of information, and can meet the requirement of daily detection of a factory.)

1. The utility model provides a portable ultrasonic thickness gauge, is mainly by probe, ultrasonic emission circuit, ultrasonic receiving circuit, singlechip, counter circuit, keyboard module, liquid crystal display module, store and clock circuit and communication module constitute, its characterized in that: the ultrasonic monitoring device is characterized in that the probe is connected with the ultrasonic transmitting circuit, the ultrasonic receiving circuit is connected with the probe, the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected with the single chip microcomputer, the single chip microcomputer is connected with the counter circuit, the counter circuit is connected with the ultrasonic receiving circuit, the keyboard module and the liquid crystal display module are both connected with the single chip microcomputer, and the clock circuit and the communication module are both connected with the single chip microcomputer.

2. The portable ultrasonic thickness gauge of claim 1, wherein: the probe adopts a longitudinal wave double-crystal straight probe, and a coupling agent is used to replace an air thin layer and fill in a contact layer between the probe and a detected workpiece.

3. The portable ultrasonic thickness gauge of claim 1, wherein: in the ultrasonic transmitting circuit, ultrasonic waves are generated by a self-excited oscillation circuit formed by a Schmidt trigger, a Schmidt inverter is formed by a high-speed CMOS device 74HC14, and an inverting output end of 74HC14 is connected back to an input end through an RC integrating circuit to form the Schmidt trigger. When the power is turned on, the 6-pin inverting output of 74HC14 is high because the initial voltage of the capacitor is zero, and begins to charge capacitor C201 through resistor 8201 and potentiometer VR 101.

Technical Field

The invention relates to a portable ultrasonic thickness gauge, and belongs to the technical field of sensor detection.

Background

In the petrochemical industry, equipment and pipelines are corroded due to various reasons during operation, even explosion, ignition and personal casualty accidents are caused due to serious corrosion, and therefore the equipment needs to be regularly detected, monitored and analyzed. The thickness value is an extremely important index reflecting the corrosion and safety conditions. The regular and extensive overall thickness detection becomes one of the important contents of the daily safety inspection of factories, and the requirement of the precise measurement of the thickness is increasing in the present society. Meanwhile, in industrial production and application, the thickness of equipment or products needs to be measured quickly and randomly, and large-scale equipment or online systems are difficult to meet the requirements, so that a portable thickness gauge is needed for realization. The invention develops a portable ultrasonic thickness gauge.

Disclosure of Invention

Aiming at the defects, the invention provides a portable ultrasonic thickness gauge.

The invention is realized by the following technical scheme: the utility model provides a portable ultrasonic thickness gauge, is mainly by probe, ultrasonic emission circuit, ultrasonic receiving circuit, singlechip, counter circuit, keyboard module, liquid crystal display module, store and clock circuit and communication module constitute, its characterized in that: the ultrasonic monitoring device is characterized in that the probe is connected with the ultrasonic transmitting circuit, the ultrasonic receiving circuit is connected with the probe, the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected with the single chip microcomputer, the single chip microcomputer is connected with the counter circuit, the counter circuit is connected with the ultrasonic receiving circuit, the keyboard module and the liquid crystal display module are both connected with the single chip microcomputer, and the clock circuit and the communication module are both connected with the single chip microcomputer.

The probe adopts a longitudinal wave double-crystal straight probe, and a coupling agent is used to replace an air thin layer and fill in a contact layer between the probe and a detected workpiece.

In the ultrasonic transmitting circuit, ultrasonic waves are generated by a self-excited oscillation circuit formed by a Schmidt trigger, a Schmidt inverter is formed by a high-speed CMOS device 74HC14, and an inverting output end of 74HC14 is connected back to an input end through an RC integrating circuit to form the Schmidt trigger. When the power is turned on, the 6-pin inverting output of 74HC14 is high because the initial voltage of the capacitor is zero, and begins to charge capacitor C201 through resistor 8201 and potentiometer VR 101.

The invention has the advantages that: the portable ultrasonic thickness gauge has the advantages of small volume, convenience in operation and the like, can realize accurate measurement, has a programmable function, can store a large amount of information, and can meet the daily detection requirements of factories.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure, the ultrasonic monitoring device comprises a probe 1, a probe 2, an ultrasonic transmitting circuit 3, an ultrasonic receiving circuit 4, a single chip microcomputer 5, a counter circuit 6, a keyboard module 7, a liquid crystal display module 8, a storage and clock circuit 9 and a communication module.

Detailed Description

The utility model provides a portable ultrasonic thickness gauge, is mainly by probe 1, ultrasonic emission circuit 2, ultrasonic receiving circuit 3, singlechip 4, counter circuit 5, keyboard module 6, liquid crystal display module 7, store and clock circuit 8 and communication module 9 constitute, its characterized in that: probe 1 is connected with ultrasonic emission circuit 2, and ultrasonic receiving circuit 3 is connected with probe 1, and ultrasonic emission circuit 2 and ultrasonic receiving circuit 3 all are connected with singlechip 4, and singlechip 4 is connected with counter circuit 5, and counter circuit 5 is connected with ultrasonic receiving circuit 3, and keyboard module 6 and liquid crystal display module 7 all are connected with singlechip 4, store and clock circuit 8 and communication module 9 all are connected with singlechip 4.

The probe 1 adopts a longitudinal wave double-crystal straight probe, uses a coupling agent to replace an air thin layer and is filled in a contact layer between the probe and a detected workpiece.

In the ultrasonic transmitting circuit 2, ultrasonic waves are generated by a self-excited oscillation circuit formed by a Schmidt trigger, a Schmidt inverter is formed by a high-speed CMOS device 74HC14, and an inverting output end of 74HC14 is connected back to an input end through an RC integrating circuit to form the Schmidt trigger. When the power is turned on, the 6-pin inverting output of 74HC14 is high because the initial voltage of the capacitor is zero, and begins to charge capacitor C201 through resistor 8201 and potentiometer VR 101.

When the device works, the single chip microcomputer ATMEGA128 is not only connected with a transmitting and receiving circuit to control the transmission of ultrasonic waves and the receiving and modulation of echo signals, but also controls a counter circuit to enable a counter module to read out effective pulses. The display module and the communication module are connected, so that the measured thickness value is displayed through the display screen, and the data can be read by a machine in the month. And is additionally connected to a clock signal. During measurement, through the action of a keyboard circuit, a single chip microcomputer controls a transmitting circuit to generate a high-voltage narrow pulse signal and transmits ultrasonic waves to a workpiece to be measured through a probe, meanwhile, a counter circuit is cleared, the front edge of a threshold pulse is established through the control of the single chip microcomputer, then an acoustic wave signal reaches the bottom of the workpiece and returns to be received by the probe, after signal amplification and middle-cycle frequency selection in a receiving circuit, the threshold pulse is established through a 74HC221 chip, the transmitting pulse is recorded as the front edge of the threshold pulse, a received primary echo pulse is recorded as the back edge of the threshold pulse, and the threshold pulse is the time used for incidence and reflection of the ultrasonic waves in the object to be measured. Then, the phase of 25MHz crystal oscillation pulse and the threshold gate pulse phase are output to a counter for counting, a counter circuit (74HC393) calculates the number of oscillation pulses within the ultrasonic propagation time interval to obtain the time for measuring the thickness of the workpiece, the time is input into a singlechip for calculation through a bus, the time is input into the singlechip for calculation through the bus, and the calculated thickness value result and the real-time are displayed through a liquid crystal display screen, so that one-time measurement is completed.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.