JP2009174934A - Ultrasonic phased array transmitter-receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-assemble ultrasonic phased array transmitter-receiver at a low price, by reducing the number of parts of ultrasonic vibrators. <P>SOLUTION: Using a rectangular ultrasonic vibrator 2, when the wavelength of underwater sound wave is defined as λ, the row direction is arranged at an interval of λ; the column direction is arranged at an interval of λ/2; and the received wave signal of twin beams is separated and detected by a FFT processing circuit 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a phased array of ultrasonic transducers that form an underwater ultrasonic beam, and more particularly to an ultrasonic phased array transducer that is reduced in size and weight by an array connection method and a driving method.

  In water, speedometers that use the Doppler effect of ultrasonic waves and sounding instruments that measure the depth of the seabed using ultrasonic propagation time are often used. A typical transducer used in this type of speedometer or depth sounder is a transducer having a beam called an orthogonal four beam that emits four beams so that the tip of the beam forms a square.

  The orthogonal four beams have a + -shape and an X-shape as the arrangement on the plan view, and the depression angle is typically 60 ° (30 ° in terms of vertical beam elevation angle).

  A conventional transducer has a structure in which four disk-shaped ultrasonic transducers having a diameter of 10 to 20 times the wavelength of underwater acoustic waves are used and the elevation angle is set in advance in the transducer. Yes.

  The directivity width of the ultrasonic beam is determined by the drive frequency and the outer diameter of the ultrasonic transducer, but the directivity width and the drive frequency are set according to the conditions for increasing the Doppler effect, and then the outer diameter of the ultrasonic transducer is determined. It is done.

  Therefore, by determining the outer diameter of the ultrasonic transducer, the shape and size of the ultrasonic Doppler transmitter / receiver that forms four orthogonal beams are generally determined.

  A disk-shaped ultrasonic Doppler transceiver that forms two beams with one phased array is disclosed in Patent Document 1. FIG. 6 is an array diagram of a conventional phased array transducer, and FIG. 7 is a directivity characteristic diagram of the conventional phased array transducer.

  In this disclosed example, as shown in FIG. 6, when the values on the COS (cosine) curve are set to weights W1 to W10 with respect to the ultrasonic transducers arranged in the horizontal direction, the beam pattern is as shown in FIG. As shown in FIG. 5, the main pole of the ultrasonic beam is formed in both directions of 30 degrees to the left and right about the horizontal axis of 0 degrees (that is, the direction perpendicular to the center of the ultrasonic transducer).

  Further, if the electrical connection is changed, an ultrasonic beam is formed in both directions 30 degrees in the longitudinal direction in the same manner.

  Since the transducer having the above structure is large in shape, various attempts have been made to make it compact. For example, a transmitter / receiver has been proposed in which rectangular ultrasonic transducers are arranged in a plane and can radiate four orthogonal beams with the same size as one disk-shaped ultrasonic transducer.

  A transducer formed by planarly arranging small rectangular plate-like ultrasonic transducers is called an ultrasonic phased array transducer, and the calculation method of speed, altitude, etc. is the same as that of the conventional transducer described above. The speed, altitude, etc. can be calculated from the reflected signals of the four beams. Such an ultrasonic phased array transducer is disclosed in Patent Document 2 or Patent Document 3.

JP-A-4-238499 JP 2001-197595 A JP 2001-305217 A

  However, when the ultrasonic phased array transducer of the conventional example is used, it is necessary to arrange a large number of rectangular plate-shaped small ultrasonic transducers in the designed position with a narrow gap between the transducers. There was a problem of being complicated and expensive.

  Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art. Specifically, by changing the shape and arrangement method of the rectangular ultrasonic transducers and adding a fast Fourier transform processing circuit (hereinafter referred to as FFT processing circuit), the number of ultrasonic transducers can be reduced and assembly can be performed. It is an object to provide a simple and inexpensive ultrasonic phased array transducer.

  The present invention has been made to solve the above-described problems, and an ultrasonic phased array transducer according to the present invention uses a rectangular ultrasonic transducer and performs the operation when the wavelength of the underwater acoustic wave is λ. By arranging the direction at λ intervals and arranging the column direction at λ / 2 intervals and separating and detecting the received signals of twin beams by FFT processing, the number of ultrasonic transducers can be reduced, and assembly of wiring etc. is easy An ultrasonic phased array transducer is provided.

  According to the present invention, an ultrasonic vibrator having a rectangular radiation surface, a surface electrode on the radiation surface, and a back electrode on the opposite surface, the polarization direction is aligned, and the longitudinal direction of the rectangle is in the column direction. In a matrix having N rows and M columns (N and M are positive positive numbers) on the plane, 2 to M / 2 ultrasonic transducers are arranged in each row, and each column has Is an ultrasonic phased array transducer in which 4 or more and N × 2 or less ultrasonic transducers are arranged, and the ultrasonic transducers have a row interval of 1 ± 0.25 in terms of the wavelength ratio of underwater acoustic waves. The matrix is arranged so that the column spacing is 0.5 ± 0.25 in terms of the wavelength ratio of the underwater acoustic wave, and the front electrode is connected to each row to form N connection groups, and the back electrode is set to each column. Connection is made into M connection groups, and the N connection groups are 1 + 2Kth and 2 + 2Kth from the top (K is 0 or more and N / 2-1 or less). The first row input / output terminal (F1) and the second row input / output terminal (F2) are connected in order, and the M connection groups are 1 + 4Lth, 2 + 4Lth from the right, The first column input / output terminal (R1) and the second column input / output terminal (R2) are divided into four groups of 3 + 4Lth and 4 + 4Lth (L is an integer of 0 or more and M / 4−1 or less). , A third column input / output terminal (R3) and a fourth column input / output terminal (R4), and the first row input / output terminal and the second row input / output terminal are connected to a first transformer (T1). And the first column input / output terminal and the third column input / output terminal are connected to the balanced secondary circuit of the second transformer (T2), and the second column input / output terminal is connected. An output terminal and the fourth column input / output terminal are connected to a balanced secondary circuit of a third transformer (T3). From the primary circuit of the first transformer, Odd-row connections and even-row connections in a mover array, odd-numbered column alternating connections from the primary circuit of the second transformer, and even-numbered columns from the primary circuit of the third transformer Thus, an ultrasonic phased array transducer can be obtained.

  According to the present invention, a first transmission / reception switching circuit is provided in each primary circuit of the first transformer (T1), the second transformer (T2), and the third transformer (T3). (SW1), a second transmission / reception wave switching circuit (SW2), and a third transmission / reception wave switching circuit (SW3) are connected, and the first transmission / reception wave switching circuit, the second transmission / reception wave switching circuit, and the first A transmission beam switching circuit that divides and switches connections into two groups of three transmission / reception switching circuits, a received beam signal output from the first transmission / reception switching circuit, and the second transmission / reception switching circuit; A received beam switching circuit that switches and outputs a received beam signal output from a received beam combining circuit that performs phase adjustment, addition, and subtraction of the received signal output from the third transmission / reception switching circuit; Fast Fourier transform of the received signal output from the receive beam switching circuit Ultrasonic phased array transducer according to claim 1, characterized in that it consists of a fast Fourier transform circuit for management is obtained.

  According to the invention, the ultrasonic transducers pass through the center of the plane formed by the matrix arrangement, and are perpendicular to the N-row arrangement including a perpendicular to the radiation surface on which the surface electrode is provided. An electrical signal for generating a transmission longitudinal twin beam having two main poles having the same angle with the perpendicular in a plane is transmitted to the ultrasonic transducer, and the received longitudinal twin beam is switched to the received beam switching The circuit is separated by a fast Fourier transform processing circuit into a frequency equivalent to a single beam on reception and a frequency equivalent to a single beam under reception, and the ultrasonic transducers are formed in the matrix array. A transmission transverse twin beam having two main poles having the same angle with the perpendicular in a plane perpendicular to the M-row arrangement including a perpendicular to the opposing surface provided with the back electrode, passing through the center of the plane The generated electrical signal is transmitted to the ultrasonic transducer, and the received received transverse twin beam is separated into a received right single beam received signal and a received left single beam received signal by the received beam combining circuit. And an ultrasonic phased array transducer that is passed through the received beam switching circuit and separated into a frequency equivalent to the received right single beam and a frequency equivalent to the received left single beam by a fast Fourier transform processing circuit. Is obtained.

  As described above, according to the present invention, by changing the shape and arrangement interval of the phased array type ultrasonic transducers and adding the FFT processing circuit, the number of ultrasonic transducers is reduced, and the assembly is simple and inexpensive. A small speedometer and sounding instrument can be provided.

  In the ultrasonic phased array transducer according to the present invention, when the wavelength of the driving frequency of the ultrasonic vibrator in the water where the pitch interval between the rows is λ is λ, P = (1 ± 0.25) × λ The matrix is arranged in a matrix on the plane with the polarization direction aligned so that the column pitch interval is P = (0.5 ± 0.25) × λ where λ is the wavelength of the driving frequency of the ultrasonic transducer in water. . Further, in the ultrasonic vibrator, the front surface electrode is divided into two groups for each row, and the back surface electrode is divided into four groups for each column. The six groups of input / output terminals are configured using three transformers.

  The ultrasonic phased array transducer according to the present invention will be described below in more detail with reference to the drawings by raising the embodiment of the present invention.

  FIG. 1 is a connection diagram of an ultrasonic phased array transducer according to an embodiment of the present invention. FIG. 1 shows the arrangement and connection of ultrasonic transducers and transformers of an ultrasonic phased array transducer, and the configuration of input / output circuits for signal processing. FIG. 2 is a perspective view showing a beam of the ultrasonic phased array transducer according to the embodiment of the present invention.

  First, the flow of the operation contents of the ultrasonic phased array transducer is summarized. There are four major ultrasonic phases: a: transmission of a transmitted vertical twin beam, b: reception of a received longitudinal twin beam, c: transmission of a transmitted transverse twin beam, and d: reception of a received transverse twin beam. There is an operation content of the array transducer. The flow of each operation is shown along the connection diagram.

a: Transmission of a transmission vertical twin beam Transmission signal 12 → Transmission beam switching circuit 5 → First transmission / reception switching circuit SW1 → First transformer T1 → Ultrasonic transducer 2 → Beams 9A, 9C

b: Reception of received longitudinal twin beams Beams 9A and 9C → ultrasonic transducer 2 → first transformer T1 → first transmission / reception switching circuit SW1 → received beam signals 11A and 11C → received beam switching circuit 7 → FFT processing circuit 8 → Reception frequency signal 13 (frequency equivalent to single beam on reception, frequency equivalent to single beam on reception)

c: Transmission of a transmission horizontal twin beam Transmission signal 12 → Transmission beam switching circuit 5 → Second transmission / reception wave switching circuit SW2 and third transmission / reception wave switching circuit SW3 → Second transformer T2 / third transformer T3 → ultrasonic transducer 2 → beams 9B and 9D

d: Reception of received horizontal twin beam Beams 9B and 9D → ultrasonic transducer 2 → second transformer T2 and third transformer T3 → second transmission / reception wave switching circuit SW2 and third transmission / reception wave switching circuit SW3 → received beam synthesis circuit 6 → received beam signals 11B and 11D → received beam switching circuit 7 → FFT processing circuit 8 → received frequency signal 13 (frequency corresponding to the received left single beam, equivalent to the received right single beam) frequency)

  One cycle of the four types of transmission and reception waves a to d described above in order of transmission, transmission vertical twin beam transmission, reception vertical twin beam reception, transmission horizontal twin beam transmission, reception horizontal twin beam reception As described above, the operation of the ultrasonic phased array transducer is configured.

  Conventionally, the ultrasonic transducer is square, and the pitch interval of the matrix is matched with the wavelength of the driving frequency of the ultrasonic transducer in water and arranged as λ / 2. In this case, however, the ultrasonic transducer is arranged in the row direction. Since gaps are created between them and the sub-poles become larger and the directivity becomes worse, when actually manufacturing, it is necessary to place a large number of gaps as narrow as possible in the design position in order to avoid disturbance of directivity. Assembly was complicated and expensive. In the present invention, the number of ultrasonic transducers is halved by replacing two square ultrasonic transducers arranged in the row direction with one rectangular ultrasonic transducer.

  The ultrasonic vibrator 2 can be made of, for example, N-6 material (Nepec ceramic material made by NEC TOKIN). In this case, the medium that emits ultrasonic waves is set as water, calculated as underwater sound speed 1500 m / s, and matched with the wavelength (λ) of the driving frequency 200 kHz, and the pitch interval of the rows is 7.5 mm (λ). Since the column pitch interval is 3.75 mm (λ / 2), the length is 7.0 mm, the width is 3.25 mm, and the height is about 7 mm, and the gap between each row and column block is 0.5 mm. In this case, an electrode is provided on two rectangular surfaces formed vertically and horizontally in this block and one of them is a positive electrode and the other is a negative electrode.

  Further, a matrix is set such that the number of ultrasonic transducers 2 is 120, N = 10 rows from the top to the bottom of the page, and M = 20 columns from the right to the left. The arrangement of the ultrasonic transducers 2 is such that the positive electrode of the ultrasonic transducer 2 is the front electrode, the negative electrode is the back electrode, and the front electrodes are aligned, and as shown in FIG. Rather than arranging the ultrasonic transducers, the number of the ultrasonic transducers 2 arranged in each row and each column was adjusted so that the outer shape would be substantially circular when arranged. The row pitch spacing was 7.5 mm (λ) and the column pitch spacing was 3.75 mm (λ / 2). In FIG. 1, the row numbers of the arranged ultrasonic transducers 2 are 1 to 10 from the top to the bottom, and the column numbers of the columns are 1 to 20 from the right to the left.

  As for the surface electrode, all the ultrasonic transducers 2 are connected to each other to form ten horizontal connections 31, and in order from the top, the (1 + 2K) row group and the (2 + 2K) row group (K Are divided into two groups of 0 and N / 2-1 or less), and the horizontal connection 31 is connected to form a first row input / output terminal F1 and a second row input / output terminal F2.

  In addition, the back electrode connects all the ultrasonic transducers 2 in each column to form 20 vertical connections 32, and the columns are arranged in the horizontal direction from the right in the (1 + 4L) column group and (2 + 4L). The vertical connection 32 is divided into four groups: a group in the column, a group in the (3 + 4L) column, and a group in the (4 + 4L) column (L is an integer of 0 or more and M / 4-1 or less). The first column input / output terminal R1, the second column input / output terminal R2, the third column input / output terminal R3, and the fourth column input / output terminal R4.

  Further, as shown in FIG. 1, the first row input / output terminal F1 and the second row input / output terminal F2 are connected to the balanced secondary circuit of the first transformer T1, and the first column input / output terminal R1 and the second row input / output terminal F1. The third column input / output terminal R3 is connected to the second transformer T2, and the second column input / output terminal R2 and the fourth column input / output terminal R4 are sequentially connected to the respective balanced secondary circuits to the third transformer T3. The neutral point of each transformer was grounded. The purpose of neutral point grounding is to obtain anti-noise performance and prevent mutual interference between front and back signals, and configure a load circuit and a balanced circuit in which transducers with reversed conversion polarity are connected in series, resulting in stable operation. It is to obtain a balanced signal.

  Furthermore, the first transmission / reception wave switching circuit SW1, the second transmission / reception wave switching circuit SW2, the third transformer T1, the second transformer T2, and the third transformer T3 on the balanced primary circuit side. A transmission / reception switching circuit SW3 was connected. The balanced primary circuit side inputs / outputs transmission / reception signals to / from each transmission / reception switching circuit using a winding for an unbalanced circuit that allows easy switching between transmission and reception. As described above, by configuring the balanced circuit, a circuit configuration that is strong against external noise can be obtained.

  Further, the first transmission / reception switching circuit SW1, the second transmission / reception switching circuit SW2, and the third transmission / reception switching circuit SW3 switch the direction in which the transmission signal and the reception signal flow. Here, the transmission beam switching circuit 5 includes a transmission longitudinal twin beam to be transmitted to two groups of the first transmission / reception switching circuit SW1, the second transmission / reception switching circuit SW2, and the third transmission / reception switching circuit SW3. It is a circuit for switching the transmission signal 12 of the horizontal transverse twin beam.

  FIG. 2 is a perspective view showing a beam of the ultrasonic phased array transducer according to the embodiment of the present invention. The ultrasonic phased array transducer 1B according to the present embodiment transmits and receives a transmission / reception longitudinal twin beam composed of a beam 9A and a beam 9C and a transmission / reception transverse twin beam composed of a beam 9B and a beam 9D.

  Further, the received beam signals 11A and 11C of the received longitudinal twin beam composed of the beam 9A and the beam 9C output from the first transmission / reception switching circuit SW1 are output from the received beam switching circuit 7 to the FFT processing circuit 8. Then, FFT processing is performed to calculate the frequency. When used as a speedometer, there is no Doppler frequency deviation if stopped, and one frequency of the same frequency fo (fo: transmission frequency) is calculated for beam 9A and beam 9A. Two frequencies of the beam 9C are calculated, fo + Δf and fo−Δf (Δf: Doppler frequency deviation). Here, it is not possible to determine which of the two frequencies is the frequency of the beam, and the velocity direction cannot be calculated, but the absolute velocity in the beam direction can be calculated. The main traveling body used in the water has the front traveling direction, and it travels diagonally by waves or the like, so it is only necessary to measure the speed and speed direction in the left-right direction.

  The reception signals output from the second transmission / reception switching circuit SW2 and the third transmission / reception switching circuit SW3 are output to the reception beam combining circuit 6 and the phase of the reception signal of the second transmission / reception switching circuit SW2. Is adjusted by the 90-degree phase shift circuit 6C, and the received signal of the adjusted 90-degree phase shift circuit 6C and the received signal output from the third transmission / reception switching circuit SW3 are added by the adder circuit 6B. Subtraction is performed by the subtracting circuit 6A, and the received horizontal twin beam composed of the beam 9B and the beam 9D is separated into the received beam signal 11B and the received beam signal 11D and output as a received beam signal.

  The principle of beam synthesis is that the odd-numbered twin beam signal output from the second transmission / reception switching circuit SW2 in which both positive and negative polarities are alternately inverted and the even-numbered twin beam output from the third transmission / reception switching circuit SW3 By adding and subtracting a phase difference of 90 ° between them, all rows are equivalent to the phase difference + 90 ° step arrangement, and the main pole azimuth is + 30 ° or −30 ° at the elevation angle of the beam. Combined into a single beam. The relationship between the line interval and the main pole direction is expressed by equations (1) and (2).

(2π / λ) × (line interval: λ / 2) × sin θo = + π / 2 (1)
∴sin θo = + 1/2, θo = + 30 °
(2π / λ) × (line interval: λ / 2) × sin θo = −π / 2 (2)
∴sin θo = −1 / 2, θo = −30 °

  3 to 5 are charts showing directivity simulation data of the ultrasonic phased array transducer according to the embodiment of the present invention.

  In FIG. 3, a transmission signal is sent to the first transmission / reception switching circuit SW1 by the transmission beam switching circuit 5, and the transmission vertical twin beam composed of the beam 9A and the beam 9C shown in FIG. This is a result of sending a transmission signal to the second transmission / reception switching circuit SW2 and the third transmission / reception switching circuit SW3, and simulating the transmission horizontal twin beam composed of the beam 9B and the beam 9D shown in FIG. 4 and 5 show the received horizontal twin beam composed of the beam 9B and the beam 9D shown in FIG. 2 output from the received beam combining circuit 6 and separated into the beam 9B and the beam 9D, and the received left single beam. It is the result of simulating a received signal output as a received right single beam.

  As described above, the ultrasonic phased array transducer according to the present invention uses rectangular ultrasonic transducers to arrange the row direction at λ intervals and to separate and detect the received signals of twin beams by FFT processing. This reduces the number of ultrasonic transducers and facilitates assembly of wiring and the like.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to these embodiment, Even if there is a design change of the range which does not deviate from the summary of this invention, it is included in this invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

  The ultrasonic phased array transducer according to the present invention can be used for measurement equipment that performs measurement and surveying in water, such as a speedometer using the Doppler effect and a sounding instrument using propagation time.

The connection diagram of the ultrasonic phased array transducer by embodiment of this invention. The perspective view which shows the beam of the ultrasonic phased array transducer by embodiment of this invention. The chart figure which shows the simulation data of the directivity of the ultrasonic phased array transducer by embodiment of this invention. The chart figure which shows the simulation data of the directivity of the ultrasonic phased array transducer by embodiment of this invention. The chart figure which shows the simulation data of the directivity of the ultrasonic phased array transducer by embodiment of this invention. FIG. 6 is an array diagram of a conventional phased array transducer. Directivity characteristic diagram of a conventional phased array transducer.

Explanation of symbols

1A, 1B Ultrasonic phased array transducer 2 Ultrasonic transducer 31 Horizontal connection 32 Vertical connection 5 Transmit beam switching circuit 6 Receive beam synthesis circuit 6A Subtraction circuit 6B Addition circuit 6C 90 degree phase shift circuit 7 Reception Beam switching circuit 8 Fast Fourier transform processing circuit (FFT processing circuit)
9A, 9B, 9C, 9D Beams 11A, 11B, 1C, 11D Received beam signal 12 Transmitted signal 13 Received frequency signal F1 First row input / output terminal F2 Second row input / output terminal R1 First column input / output terminal R2 Second column input / output terminal R3 Third column input / output terminal R4 Fourth column input / output terminal SW1 First transmission / reception switching circuit
SW2 Second transmission / reception switching circuit
SW3 Third transmission / reception switching circuit
T1 1st transformer T2 2nd transformer T3 3rd transformer

Claims (3)

  An ultrasonic transducer having a rectangular radiation surface, a surface electrode on the radiation surface, and a back electrode on the opposite surface, is aligned on the plane so that the longitudinal direction of the rectangle is in the column direction with the polarization direction aligned. In a matrix having N rows and M columns (N and M are positive positive numbers), 2 to M / 2 ultrasonic transducers are arranged in each row, and 4 or more N × in each column. An ultrasonic phased array transducer in which two or less of the ultrasonic transducers are arranged, and the ultrasonic transducer has a row interval of 1 ± 0.25 in terms of a wavelength ratio of underwater acoustic waves, and a column interval. Are arranged in a matrix so that the wavelength ratio of the underwater acoustic wave is 0.5 ± 0.25, the front electrodes are connected to each row to form N connection groups, and the back electrodes are connected to each column to form M wires. The N connection groups are divided into 2 groups of 1 + 2Kth and 2 + 2Kth (K is an integer of 0 or more and N / 2-1 or less) from the top. The first row input / output terminal (F1) and the second row input / output terminal (F2) are connected in order, and the M connection groups are 1 + 4Lth, 2 + 4Lth, 3 + 4Lth, 4 + 4Lth from the right. (L is an integer of 0 or more and M / 4-1 or less) divided into four groups and connected to the first column input / output terminal (R1), second column input / output terminal (R2), and third column An input / output terminal (R3) and a fourth column input / output terminal (R4) are used, and the first row input / output terminal and the second row input / output terminal are balanced secondary circuits of the first transformer (T1). The first column input / output terminal and the third column input / output terminal are connected to a balanced secondary circuit of a second transformer (T2), and the second column input / output terminal and the second column input / output terminal 4 column input / output terminals are connected to a balanced secondary circuit of a third transformer (T3), and an odd number of vibrator arrangements from the primary circuit of the first transformer. And even row connections, odd column alternating connections from the primary circuit of the second transformer, and even column alternating connections from the primary circuit of the third transformer. Ultrasonic phased array transducer characterized by that.   A first transmission / reception switching circuit (SW1), a second transmission circuit (T1), a second transformer (T2), a third transformer (T3), a first transmission / reception wave switching circuit (SW1), a second transformer (T1), a second transformer (T2), and a third transformer (T3). A transmission / reception wave switching circuit (SW2) and a third transmission / reception wave switching circuit (SW3) are connected, and the first transmission / reception wave switching circuit, the second transmission / reception wave switching circuit, and the third transmission / reception wave switching circuit are connected. A transmission beam switching circuit for switching connections divided into two groups, a received beam signal output from the first transmission / reception switching circuit, the second transmission / reception switching circuit, and the third transmission / reception switching Received beam switching circuit for switching and outputting the received beam signal output from the received beam combining circuit that performs phase adjustment, addition, and subtraction of the received signal output from the circuit, and output from the received beam switching circuit Fast Fourier transform of received received signal Ultrasonic phased array transducer according to claim 1, characterized in that it consists of a conversion processing circuit.   Two of the ultrasonic transducers having the same angle formed with the perpendicular in a plane perpendicular to the N-row arrangement including the perpendicular to the radiation surface through the center of the plane formed by the matrix arrangement. An electrical signal for generating a transmission longitudinal twin beam having a main pole is transmitted to the ultrasonic transducer, and the received reception longitudinal twin beam passes through the reception beam switching circuit and is received by a fast Fourier transform processing circuit. A frequency corresponding to a single beam and a frequency corresponding to a single beam under reception are separated, and a perpendicular to the opposite surface passes through the center of the plane formed by forming the ultrasonic transducers in the matrix arrangement. An electric signal for generating a transmission transverse twin beam having two main poles having the same angle with the perpendicular in a plane perpendicular to the M-row arrangement is transmitted to the ultrasonic transducer and received. side The received beam is separated by the received beam combining circuit into a received right single beam received signal and a received left single beam received signal, passed through the received beam switching circuit, and received by a fast Fourier transform processing circuit. 3. The ultrasonic phased array transducer according to claim 1, wherein the ultrasonic phased array transducer is separated into a frequency equivalent to a right single beam and a frequency equivalent to a received left single beam.

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