TWI730729B - Ultrasonic power detection device and method - Google Patents

Abstract

The invention discloses an ultrasonic power detection device and a method thereof. The ultrasonic power detection device includes a sensing element, a resonance circuit, an amplifying circuit, an arithmetic circuit and a display. The sensing element senses the radiation force generated by the ultrasonic transducer to generate an ultrasonic radiation force signal. The resonant circuit converts the ultrasonic radiation force signal into a resonant current signal. The amplifying circuit amplifies the resonant current signal. The calculation circuit processes the resonant current signal. The display is electrically connected to a calculation circuit, where the calculation circuit determines whether the amplitude of the resonant current signal is greater than a preset value. If so, the calculation circuit calculates the instantaneous power, maximum instantaneous power, average power and output energy of the resonant current signal, and displays it on the display The instantaneous power, maximum instantaneous power, average power, output energy, resonance frequency and amplitude of the resonant current signal; if not, the display will display the air strike message.

Description

Ultrasonic power detection device and method

The present invention relates to a power detection device and a method thereof, in particular to an ultrasonic power detection device and a method thereof.

Nowadays, ultrasonic equipment and medical ultrasound are widely used. The measurement of power and energy adopts the radiation force balance method. This method needs to be performed outside the ultrasonic transducer, and the conventional ultrasonic transducer Energy control feedback control technology only monitors the resonance state of the excitation circuit itself, and cannot determine whether the true output energy and power of the ultrasonic transducer are normal, so air strikes are often caused.

As shown in FIG. 1A, it is a schematic diagram of the balance of the radiation force generated by the conventional ultrasonic transducer. Conventional ultrasonic transducers, such as the Ultrasonic water meter of Ohmic Instrument Company, use the principle of radiation force balance, which uses a conical floating body to float in the water, using water buoyancy and the ultrasonic transducer to produce The force balance state is to measure the force exerted by the ultrasonic transducer on the floating body, and then convert it into an increased power value. The ultrasonic transducer 11 is erected above the box 12 and placed in the box 12, wherein a certain amount of water 13 is placed in the box 12, and a conical pontoon 14 is placed in the water 13, and its center point corresponds to the ultrasonic transducer 11 In the center, the conical pontoon 14 is connected to the connecting rod 15. When the ultrasonic transducer 11 acts, the ultrasonic radiation force is exerted on the conical pontoon 14 via the water body 13, causing the conical pontoon 14 to sink slightly, generating down pressure F , Using this sinking pressure F to convert the power value emitted by the ultrasonic transducer 11. However, this method uses the buoyancy of water and cannot respond to the instantaneous power of the ultrasonic transducer 11, so the instantaneous power cannot be calculated, and the accuracy of the measurement is easily affected by the vibration of the water 13 body. In addition, for the focused ultrasonic transducer, because the applied pressure is not parallel downward, it is different from the principle deduction. The converted power error is large, and it is not suitable for measuring the focused ultrasonic transducer, and it is not suitable for measuring the focused ultrasonic transducer. It cannot be effectively measured under instability. The local temperature rises during multiple firings, which will easily affect the buoyancy of the water, which will make the value of multiple rapid measurements unstable, and this method is not suitable for ultrasonic transducers with moving push rods. When the push rod moves and causes shaking, it directly affects the stability of the water body, and then causes the measured value to deviate, and the power value cannot be measured.

Please refer to Figure 1B, which is a schematic diagram of the ultrasonic focusing energy inspection of the conventional patented TWI577415B ultrasonic skin lifter. As shown in FIG. 1B, it uses an ultrasonic skin lifter 21 with a ceramic probe 22 inside. The ultrasonic wave S is generated through the ceramic probe 22, and the focus is gathered between the bio-imitation material layer 23 and the base layer 24 through the bio-imitation material layer 23. Thermal coagulation base point a, the method of judging the ultrasonic energy from the shape and size of thermal coagulation base point a. This method requires an additional measuring instrument to observe the size of the thermal coagulation base point a as a comparison reference. It cannot directly measure the actual energy detection value, and it cannot continuously fire at the same point to observe the energy change, and it cannot form an effective measurement. The equipment is not suitable for energy measurement of non-focused ultrasonic equipment.

The conventional US 6,691,578 B1 patent uses an ultrasonic transducer as a receiver for calibration and power measurement. This method requires the transmitter and receiver to be placed in an external container, and it must be used in a limited known manner. Only under the condition of the receiving frequency of the transducer can a calibration measurement loop be formed. It cannot operate at an unknown transducer receiving frequency, nor can it be set in the same ultrasonic probe to realize this feedback system.

Continuing from the above, the two methods described in Figure 1A and Figure 1B cannot use ultrasound while outputting through the ultrasound transducer, forming a feedback control system to adjust the output power or energy of the ultrasound. Directly judge whether there is an air strike. Furthermore, because the conventional technology uses the excitation voltage to directly feedback control, adjust and control the excitation frequency or excitation time of the ultrasonic wave, but this method does not know whether the ultrasonic radiation force of the actual excitation has reached the required energy. It is determined that the ultrasonic transducer is currently in working condition. In other words, the conventional ultrasonic transducer energy control feedback control technology only monitors the resonance state of the excitation circuit itself, and cannot determine whether the true output energy and power of the transducer are normal, so air strikes are often caused.

Accordingly, how to provide an ultrasonic power detection device and method to improve the above problems has become an urgent research topic.

In view of the above problems, the present invention discloses an ultrasonic power detection device, which includes a sensing element, a resonance circuit, an amplifying circuit, an arithmetic circuit, and a display. The sensing element senses the radiation force generated by the ultrasonic transducer to generate an ultrasonic radiation force signal. The resonant circuit converts the ultrasonic radiation force signal into a resonant current signal. The amplifying circuit amplifies the resonant current signal. The calculation circuit processes the resonant current signal. The display is electrically connected to a calculation circuit, where the calculation circuit determines whether the amplitude of the resonant current signal is greater than a preset value. If so, the calculation circuit calculates the instantaneous power, maximum instantaneous power, average power and output energy of the resonant current signal, and displays it on the display The instantaneous power, maximum instantaneous power, average power, output energy, resonance frequency and amplitude of the resonant current signal; if not, the display will display the air strike message.

As mentioned above, the ultrasonic power detection device and method of the present invention use the micro current generated by the metal stress to detect the ultrasonic output power and energy after resonant amplification, so as to directly determine whether the ultrasonic probe has an air strike phenomenon.

Please refer to FIG. 2, which is a block diagram of the ultrasonic power detection device of the present invention. The ultrasonic power detection device 3 includes a sensing element 31, a resonance circuit 32, an amplifier circuit 33, an arithmetic circuit 34 and a display 35. The sensing element 31 senses the radiation force generated by the ultrasonic transducer to generate an ultrasonic radiation force signal. The resonance circuit 32 converts the ultrasonic radiation force signal into a resonance current signal. The amplifier circuit 33 amplifies the resonance current signal. The calculation circuit 34 processes the resonant current signal. The display 35 is electrically connected to the calculation circuit 34. The calculation circuit 34 determines whether the amplitude of the resonance current signal is greater than a preset value. If so, the calculation circuit 34 calculates the instantaneous power, maximum instantaneous power, average power and output energy of the resonance current signal. The display 35 displays the instantaneous power, maximum instantaneous power, average power, output energy, resonance frequency and amplitude of the resonance current signal; if not, the display 35 displays the air strike message.

Please refer to FIGS. 3A and 3B, which are a perspective view and a cross-sectional view of the ultrasonic power detection device of the present invention. The sensing element 31 of the ultrasonic power detection device 3 includes a metal rod or a metal sheet, and the material of the sensing element 31 includes copper, nickel, aluminum, zinc oxide or semiconductor materials. The metal rod M is used as an example in FIG. 3B. , But it is not limited in the present invention. In addition, the shape of the sensing element 31 is a rod-shaped element or a chip-shaped element, but it is not limited to this. The resonance circuit 32, the amplifying circuit 33 and the calculation circuit 34 in the ultrasonic power detection device 3 are arranged in a circuit board C, and the circuit board C is electrically connected to the metal rod M and the display 35, and is arranged inside the housing 351 of the display 35 . The ultrasonic power detection device 3 further includes a box B, which is arranged on the shell 351 of the display 35. The box B contains water. The metal rod M penetrates into the water at the bottom of the box B from the shell 351 of the display 35. The ultrasonic probe U is also set in the water of the box B, and the method of detecting the ultrasonic power is as follows.

Please refer to FIG. 4, which is a flowchart of the steps of the ultrasonic power detection method of the present invention. The ultrasonic power detection method includes the following steps: in step S41, the ultrasonic probe is turned on, so that the ultrasonic transducer of the ultrasonic probe generates radiation force; in step S42, a radiation generated by an ultrasonic transducer is sensed In step S43, convert the radiation force into a resonant current; in step S44, amplify the resonant current; in step S45, process the resonant current; in step S46, determine whether the amplitude of the resonant current is greater than a preset value ; If yes, in step S47, calculate the instantaneous power, maximum instantaneous power, average power, and output energy of the resonance current, and display the instantaneous power, maximum instantaneous power, average power, output energy, resonance frequency and amplitude of the resonance current; if No, in step S48, an air strike message is displayed.

The ultrasonic power detection method is as described in the block diagram of FIG. 2 above. The radiation force generated by the ultrasonic transducer is transmitted to the sensing element 31 by water, and is sensed by the sensing element 31. The sensing element 31 uses metal strain. The effect is to form a complete detector with the resonance circuit 32, which converts the ultrasonic radiation force into a current signal, which is amplified by the amplifying circuit 33 and enters the calculation circuit 34 for calculation, and the calculation result is displayed on the display 35. In the embodiment of the present invention, the calculation circuit 34 includes a microprocessor circuit. In actual operation, first put a certain amount of water in the box B, and fix the ultrasonic probe U in the water body. After turning on the power button of the display 35, press the calibration key of the display 35 to perform zero calibration, and then turn on the super The power of the sonic probe U makes the ultrasonic transducer in the ultrasonic probe U generate radiation, which can display the frequency, amplitude, energy and whether or not the air strike is on the display 35.

時，即判定為空擊，則於顯示器顯示空擊，當諧振電流的震幅高於諧振電流最小值

時，則於顯示器顯示諧振電流的頻率與震幅，並依據公式計算下瞬時功率、最大瞬時功率、平均功率、輸出能量等參數，並在顯示器上顯示各個參數值。以下列出各個參數的計算公式。 Please refer to FIG. 5, which is a signal timing diagram of the ultrasonic power detection device of the present invention. Figure 5 shows the switching control signal, excitation voltage signal, radiation force signal, and resonance current signal of the ultrasonic transducer from top to bottom. When the ultrasonic transducer is turned on, the switch control signal is at a high potential, and when it is turned off, the switch control signal is at a low potential. The excitation voltage signal is a high-frequency voltage signal in the form of a sine wave. Vpp represents the peak-to-peak value of the excitation voltage. The normal state of the excitation voltage is shown in waveform a1. If the ultrasonic transducer or parts are aging, the excitation voltage can be increased. The peak-to-peak value reduction is shown in waveform a2. If it cannot be excited normally, its peak-to-peak value may be reduced as shown in waveform a3, or even zero. At this time, corresponding to the ultrasonic radiation force signal output by the ultrasonic transducer, the output When it is normal, it is shown in waveform b1, when it is reduced, the response is shown in waveform b2. When it cannot be fired normally, the output is shown in waveform b3. At this time, it is a so-called empty strike. At this time, the resonant current generated by the sensing element and the resonant circuit is input to the amplifying circuit, and the amplified resonant current is input to the arithmetic circuit to determine whether the ultrasonic transducer is in the on state. The amplified resonant current signal is like waveform c1 , C2 and c3. If the ultrasonic transducer is in the on state, calculate the frequency and amplitude of the resonant current, when the amplitude of the resonant current is lower than or equal to the minimum value of the resonant current

When it is judged to be an air strike, the display shows an air strike. When the amplitude of the resonance current is higher than the minimum value of the resonance current

When the frequency and amplitude of the resonant current are displayed on the display, the instantaneous power, maximum instantaneous power, average power, output energy and other parameters are calculated according to the formula, and each parameter value is displayed on the display. The calculation formulas for each parameter are listed below.

，最大瞬時功率：

，平均功率：

，其中，

，

，

：實時諧振電壓；

：實時諧振電流；

：諧振角頻率；

：實時諧振電壓角度，

:實時諧振電流角度，

:瞬時功率，

:平均功率，

: 最大瞬時功率。輸出能量：

，其中

，進一步的說明 k 轉換因子的計算方式，轉換因子直接對應於超音波換能器的輸出功率，

，其中

，

:諧振電流有效值，

:初級諧振電流峰對峰值，此為諧振電路的輸出電流峰對峰值，

:諧振電流峰對峰值，

:諧振阻抗，此為諧振電路的輸出阻抗，一般而言定為儀器標準輸出阻抗50歐姆，

:超音波聲功率，

:作用時間，此為超音波換能器開關電路開啟時間，

:轉換因子，

:放大器之放大率。 Instantaneous power:

, The maximum instantaneous power:

, Average power:

,among them,

,

,

: Real-time resonance voltage;

: Real-time resonance current;

: Resonant angular frequency;

: Real-time resonance voltage angle,

: Real-time resonant current angle,

: Instantaneous power,

: Average power,

: Maximum instantaneous power. Output energy:

,among them

, To further explain the calculation method of k conversion factor, the conversion factor directly corresponds to the output power of the ultrasonic transducer,

,among them

,

: The effective value of resonance current,

: Primary resonant current peak-to-peak value, this is the peak-to-peak output current of the resonant circuit,

: Resonant current peak-to-peak value,

: Resonance impedance, this is the output impedance of the resonant circuit. Generally speaking, it is set as the standard output impedance of the instrument 50 ohms.

: Ultrasonic sound power,

: Action time, this is the turn-on time of the switch circuit of the ultrasonic transducer,

: Conversion factor,

: The magnification of the amplifier.

In summary, the ultrasonic power detection device and method of the present invention use the micro current generated by the metal stress to detect the ultrasonic output power and energy after resonant amplification, so as to directly determine whether the ultrasonic probe has an air strike phenomenon.

11: Ultrasonic transducer 12: Cabinet 13: water 14: Cone float 15: connecting rod 21: Ultrasonic peeling machine 22: Ceramic probe 23: Imitation biomaterial layer 24: grassroots 3: Ultrasonic power detection device 31: Sensing element 32: Resonant circuit 33: Amplifying circuit 34: calculation circuit 35: display 351: Shell U: Ultrasonic probe a: Thermosetting base point M: Metal rod C: Circuit board B: Box S: Ultrasonic Vpp: peak-to-peak excitation voltage Ippmin: minimum value of resonant current S41~S48: steps

Figure 1A is a schematic diagram of the balance of radiation generated by the conventional ultrasonic transducer; Figure 1B is a schematic diagram of the ultrasonic focusing energy inspection of the conventional patent TWI577415B ultrasonic skin lifter; Figure 2 is a block diagram of the ultrasonic power detection device of the present invention; 3A and 3B are a perspective view and a cross-sectional view of the ultrasonic power detection device of the present invention; Figure 4 is a flowchart of the steps of the ultrasonic power detection method of the present invention; and Fig. 5 is a signal timing diagram of the ultrasonic power detection device of the present invention.

3: Ultrasonic power detection device

31: Sensing element

32: Resonant circuit

33: Amplifying circuit

34: calculation circuit

35: display

Claims (10)

An ultrasonic power detection device, comprising: a sensing element, which senses a radiation force generated by an ultrasonic transducer to generate an ultrasonic radiation force signal; a resonance circuit, which converts the ultrasonic radiation force signal to a A resonant current signal; an amplifying circuit to amplify the resonant current signal; an arithmetic circuit to process the resonant current signal; and a display electrically connected to the arithmetic circuit; wherein the arithmetic circuit determines whether an amplitude of the resonant current signal is greater than A preset value; if so, the calculation circuit calculates an instantaneous power, a maximum instantaneous power, an average power, and an output energy of the resonant current signal, and the display displays the instantaneous power and the maximum instantaneous power of the resonant current signal Power, the average power, the output energy, a resonance frequency and the amplitude; if not, the display displays an air strike message. The ultrasonic power detection device according to claim 1, wherein the sensing element includes a metal rod or a metal sheet. The ultrasonic power detection device according to claim 2, wherein a material of the sensing element includes copper, nickel, aluminum, zinc oxide or a semiconductor material. The ultrasonic power detection device according to claim 1, wherein the sensing element is a rod-shaped element or a chip-shaped element. The ultrasonic power detection device according to claim 1, wherein the resonance circuit, the amplifying circuit and the calculation circuit are arranged in a circuit board, and the circuit board is electrically connected to the sensing element. The ultrasonic power detection device according to claim 5, further comprising a box body disposed on a shell of the display, wherein the box body contains water inside, and the sensing element is formed by the shell of the display It penetrates into the water at the bottom of one of the boxes, and the ultrasonic transducer is set in the water. An ultrasonic power detection method includes the following steps: sensing a radiation force generated by an ultrasonic transducer; converting the radiation force into a resonant current; amplifying the resonant current; and processing the resonant current; wherein the resonant current is processed The steps include determining whether an amplitude of the resonance current is greater than a preset value; if so, calculating an instantaneous power, a maximum instantaneous power, an average power, and an output energy of the resonance current, and displaying the instantaneous value of the resonance current Power, the maximum instantaneous power, the average power, the output energy, a resonance frequency, and the amplitude; if not, an air strike message is displayed. The ultrasonic power detection method according to claim 7, wherein the radiation force generated by the ultrasonic transducer is sensed by a sensing element. The ultrasonic power detection method according to claim 8, wherein the sensing element includes a metal rod or a metal sheet. The ultrasonic power detection method according to claim 8, wherein a material of the sensing element includes copper, nickel, aluminum, zinc oxide or a semiconductor material.

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