JP2862746B2 - Ultrasonic receiver capable of suppressing side lobes - Google Patents
Ultrasonic receiver capable of suppressing side lobesInfo
- Publication number
- JP2862746B2 JP2862746B2 JP5040149A JP4014993A JP2862746B2 JP 2862746 B2 JP2862746 B2 JP 2862746B2 JP 5040149 A JP5040149 A JP 5040149A JP 4014993 A JP4014993 A JP 4014993A JP 2862746 B2 JP2862746 B2 JP 2862746B2
- Authority
- JP
- Japan
- Prior art keywords
- vibrator
- transducer
- group
- output
- phase difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Radar Systems Or Details Thereof (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は複数の振動子エレメント
を等間隔に、かつ平行に配列した第１の振動子群と、第
１の振動子群の各振動子エレメントに隣接してそれぞれ
振動子エレメントを平行に配列した第２の振動子群とか
らなり、第１の振動子群の配列中心と第２の振動子群の
配列中心は所定寸法だけずらされている送受波器を用
い、サイドローブを抑制する超音波受信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first vibrator group in which a plurality of vibrator elements are arranged at equal intervals and in parallel, and a vibrator adjacent to each vibrator element of the first vibrator group. A second transducer group in which transducer elements are arranged in parallel, using a transducer in which the arrangement center of the first transducer group and the arrangement center of the second transducer group are shifted by a predetermined dimension, The present invention relates to an ultrasonic receiver that suppresses side lobes.
【０００２】[0002]
【従来の技術】図４は従来の超音波受信装置に用いられ
る送受波器を示す図、図５は図４の送受波器を用いた従
来の超音波受信装置を示すブロック図である。送受波器
３０は、振動子エレメントＣ0,Ｃ1,〜,Ｃｎからなる振
動子群３１と、配列中心が振動子群３１の配列中心から
寸法ｄだけずらされた振動子エレメントＤ0,Ｄ1,〜,Ｄ
ｎからなる振動子群３２とにより構成されている。振動
子群３１,３２の出力はまとめられて増幅器４０に与え
られる。増幅器４０の出力は整流器５０により整流され
る。2. Description of the Related Art FIG. 4 is a diagram showing a transducer used in a conventional ultrasonic receiving apparatus, and FIG. 5 is a block diagram showing a conventional ultrasonic receiving apparatus using the transducer shown in FIG. The transducer 30 includes a transducer group 31 composed of transducer elements C0, C1,..., And Cn, and transducer elements D0, D1,. D
and a vibrator group 32 composed of n. The outputs of the transducer groups 31 and 32 are combined and supplied to the amplifier 40. The output of the amplifier 40 is rectified by the rectifier 50.
【０００３】上述の送受波器３０に対し図６に示される
ように音波入射角をθとすると、ｘ方向（図４で示され
るｘ方向に同じ）における振動子群３１,３２間の位相
差αは 式（１）で、超音波受信装置の合成指向特性は
式（２）でそれぞれ示される（ただし、ｎは整数）。[0003] Assuming that the incident angle of the sound wave with respect to the transducer 30 is θ as shown in FIG. 6, the phase difference between the transducer groups 31 and 32 in the x direction (the same as the x direction shown in FIG. 4). α is expressed by Expression (1), and the combined directional characteristic of the ultrasonic receiving apparatus is expressed by Expression (2), where n is an integer.
【０００４】 α＝（２π／λ）・ｄ・ｓｉｎθ ・・・・・・・・・・・・・・（１） Ｒ1（θ）＝Ｒ0（θ）・ｃｏｓ｛（πｄ／λ）・ｓｉｎθ｝・・・（２） Ｒ0（θ）はｘ方向における振動子の指向性関数したが
って、式（２）から分かるように、サイドローブが抑制
されるのは、下記の式（３）が成立する場合のみであ
る。Α = (2π / λ) · d · sin θ (1) R 1 (θ) = R 0 (θ) · cos ｛(πd / λ) Sin θ｝ (2) R 0 (θ) is the directivity function of the vibrator in the x direction. Therefore, as can be seen from equation (2), the side lobe is suppressed by the following equation (3) Is only true.
【０００５】 （πｄ／λ）・ｓｉｎθ＝｛（２ｎ−１）／２｝・π ・・・・（３） 数カ所でサイドローブを抑制しようとする場合には、図
７に示すように数組の振動子群を所定寸法ずらして配列
した送受波器を用いなければならない。(Πd / λ) · sin θ = {(2n−1) / 2} · π (3) When side lobes are to be suppressed in several places, several sets are required as shown in FIG. It is necessary to use a transducer in which the vibrator groups are shifted by a predetermined size.
【０００６】[0006]
【発明が解決しようとする課題】上述した従来の超音波
受信装置は、多くの指向角においてサイドローブを抑制
しようとすると、配列中心を所定寸法ずらした多数組の
振動子群を具備する送受波器を用意しなければならない
という問題点がある。In order to suppress the side lobes at many directional angles, the conventional ultrasonic receiving apparatus described above has a transmitting and receiving device having a large number of transducer groups whose arrangement centers are shifted by a predetermined dimension. There is a problem that a container must be prepared.
【０００７】本発明は上記問題点に鑑み、多数組の振動
子群を具備する送受波器を用いることなく、所望の指向
角においてサイドローブを抑制できる超音波受信装置を
提供することを目的とする。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an ultrasonic receiving apparatus capable of suppressing a side lobe at a desired directional angle without using a transducer having a large number of transducer groups. I do.
【０００８】[0008]
【課題を解決するための手段】本発明の超音波受信装置
は、複数の振動子エレメントを等間隔に、かつ平行に配
列した第１の振動子群と、第１の振動子群の各振動子エ
レメントに隣接してそれぞれ振動子エレメントを平行に
配列した第２の振動子群とからなり、第１の振動子群の
配列中心と第２の振動子群の配列中心は所定寸法だけず
らされている送受波器を用いる超音波受信装置であっ
て、第１の振動子群の受信信号と、第２の振動子群の受
信信号とを合成する受信信号合成回路と、第１の振動子
群の受信信号と、第２の振動子群の受信信号との位相差
を検出する位相差検出回路と、位相差検出回路が検出し
た位相差に基づく補正分を受信信号合成回路の出力に加
え、サイドローブを減少させる補正回路とを有する。According to an ultrasonic receiving apparatus of the present invention, a first vibrator group in which a plurality of vibrator elements are arranged at equal intervals and in parallel, and each vibrator of the first vibrator group is provided. A second vibrator group in which vibrator elements are arranged in parallel adjacent to the vibrator elements, wherein the arrangement center of the first vibrator group and the arrangement center of the second vibrator group are shifted by a predetermined dimension. An ultrasonic receiving apparatus using a transducer, comprising: a receiving signal combining circuit that combines a receiving signal of a first transducer group and a receiving signal of a second transducer group; and a first transducer. A phase difference detection circuit for detecting a phase difference between the reception signal of the group and the reception signal of the second transducer group, and a correction based on the phase difference detected by the phase difference detection circuit added to the output of the reception signal synthesis circuit. , A correction circuit for reducing side lobes.
【０００９】また、本発明の超音波受信装置は、複数の
振動子エレメントを等間隔に、かつ平行に配列した第１
の振動子群と、第１の振動子群の各振動子エレメントに
隣接してそれぞれ振動子エレメントを平行に配列した第
２の振動子群とからなり、第１の振動子群の配列中心と
第２の振動子群の配列中心は所定寸法だけずらされてい
る送受波器を用いる超音波受信装置であって、第１の振
動子群の受信信号を受信する第１の増幅器と、第２の振
動子群の受信信号を受信する第２の増幅器と、第１，第
２の増幅器の出力を加算する加算器と、加算器の出力を
整流する第１の整流器と、第１，第２の増幅器の出力の
位相差を検出する位相検出器と、位相検出器の出力を整
流する第２の整流器と、第２の整流器の出力を増幅する
第３の増幅器と、第１の整流器の出力から第３の増幅器
の出力を減算する減算器と、減算器の減算結果の絶対値
を出力する絶対値整流回路とを有する。Further, the ultrasonic receiving apparatus according to the present invention has a structure in which a plurality of transducer elements are arranged at equal intervals and in parallel.
And a second vibrator group in which vibrator elements are arranged in parallel adjacent to the vibrator elements of the first vibrator group, respectively. An ultrasonic receiving apparatus using a transducer whose center of arrangement of the second transducer group is shifted by a predetermined dimension, wherein the first amplifier receives a reception signal of the first transducer group and the second amplifier. A second amplifier that receives the received signals of the oscillator groups of the first and second oscillators; an adder that adds the outputs of the first and second amplifiers; a first rectifier that rectifies the output of the adder; Detector for detecting the phase difference between the outputs of the amplifiers, a second rectifier for rectifying the output of the phase detector, a third amplifier for amplifying the output of the second rectifier, and an output of the first rectifier Subtracter for subtracting the output of the third amplifier from the output signal, and an absolute value for outputting the absolute value of the subtraction result of the subtractor And a flow circuit.
【００１０】[0010]
【作用】第１の振動子群と、第２の振動子群とからの受
信信号は、音波入射角の相違により位相差を発生させ
る。位相差検出回路はこの位相差を検出し、受信信号合
成回路が合成した出力に、位相差に基づく信号を加えサ
イドローブを消去させる。The received signals from the first vibrator group and the second vibrator group generate a phase difference due to the difference in the incident angle of the sound wave. The phase difference detection circuit detects this phase difference and adds a signal based on the phase difference to the output synthesized by the reception signal synthesis circuit to eliminate side lobes.
【００１１】[0011]
【実施例】次ぎに、本発明の実施例について図面を参照
して説明する。図１は本発明の超音波受信装置の実施例
に用いられる送受波器を示す図、図２は本発明の超音波
受信装置の一実施例を示すブロック図であって、図１の
送受波器を用いたものを示す。図３は図２の実施例にお
ける各部の出力を示す特性図である。Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a transmitter / receiver used in an embodiment of the ultrasonic receiving apparatus of the present invention, and FIG. 2 is a block diagram showing an embodiment of the ultrasonic receiving apparatus of the present invention. Shown below is an example using a container. FIG. 3 is a characteristic diagram showing the output of each unit in the embodiment of FIG.
【００１２】送受波器１は、振動子エレメントＡ0,Ａ1,
〜,Ａｎからなる振動子群１１と、配列中心が振動子群
１１の配列中心から寸法ｄだけずらされた振動子エレメ
ントＢ0,Ｂ1,〜,Ｂｎからなる振動子群１２とにより構
成されており、図４で示された送受波器に実質的に同じ
である。振動子群１１,１２の出力はそれぞれ増幅器２,
３に伝達される。増幅器２,３の出力は加算器４により
加算される。加算器４の出力は、整流器５によって整流
され、図３（ａ）で示されるような出力Ｒ1（θ）とし
て出力される。The transducer 1 includes transducer elements A0, A1,
, An and a vibrator group 12 composed of vibrator elements B0, B1,..., Bn whose arrangement center is shifted from the arrangement center of the vibrator group 11 by the dimension d. , Is substantially the same as the transducer shown in FIG. The outputs of the oscillator groups 11 and 12 are respectively connected to the amplifiers 2 and
3 is transmitted. The outputs of the amplifiers 2 and 3 are added by an adder 4. The output of the adder 4 is rectified by the rectifier 5 and output as an output R 1 (θ) as shown in FIG.
【００１３】一方、位相検出器６は増幅器２,３の出力
の位相差を検出する。位相検出器６が検出した位相差に
基づく出力は、整流器７によって整流される。整流器７
の出力はさらに増幅器８により増幅され、図３（ｂ）で
示されるような出力Ｒ2（θ）として出力される。減算
器９は出力Ｒ1（θ）から出力Ｒ2（θ）を減算する。絶
対値整流回路１０は、減算器９の減算結果の絶対値整流
出力を算出し、図３（ｃ）で示されるような絶対値整流
出力（Ｒ1（θ）−Ｒ2（θ））を出力する（ただし、
（Ｒ1（θ）−Ｒ2（θ））≧０））。On the other hand, a phase detector 6 detects a phase difference between the outputs of the amplifiers 2 and 3. The output based on the phase difference detected by the phase detector 6 is rectified by the rectifier 7. Rectifier 7
Is further amplified by the amplifier 8 and output as an output R 2 (θ) as shown in FIG. The subtractor 9 subtracts the output R 2 (θ) from the output R 1 (θ). The absolute value rectification circuit 10 calculates the absolute value rectified output of the subtraction result of the subtractor 9 and calculates the absolute value rectified output (R 1 (θ) −R 2 (θ)) as shown in FIG. Output (but
(R 1 (θ) −R 2 (θ)) ≧ 0)).
【００１４】この場合の絶対値整流出力は式から分かる
ように音波入射角θの連続した値に対して出力される。
したがって、本実施例によれば、多数組の振動子群でな
く、従来からある２組の振動子群を具備する送受波器を
用いて、所望の指向角においてサイドローブを抑制でき
る超音波受信装置を容易に実現できる利点がある。The absolute value rectified output in this case is output with respect to the continuous value of the sound wave incident angle θ as can be seen from the equation.
Therefore, according to the present embodiment, it is possible to suppress the side lobe at a desired directional angle by using a transducer having two conventional transducer groups instead of a large number of transducer groups. There is an advantage that the device can be easily realized.
【００１５】[0015]
【発明の効果】以上説明したように本発明は、２組の振
動子群からの受信信号の位相差を位相検出器が検出し、
検出した位相差に基づいた出力をサイドローブを抑制す
る方向に加えることにより、任意の指向角におけるサイ
ドローブを最小化することができるという効果がある。As described above, according to the present invention, the phase detector detects the phase difference between the received signals from the two transducer groups,
By adding an output based on the detected phase difference in a direction to suppress the side lobe, there is an effect that the side lobe at an arbitrary directional angle can be minimized.
【図１】本発明の超音波受信装置の実施例に用いられる
送受波器を示す図である。FIG. 1 is a diagram illustrating a transducer used in an embodiment of an ultrasonic receiving apparatus according to the present invention.
【図２】本発明の超音波受信装置の一実施例を示すブロ
ック図であって、図１の送受波器を用いたものを示す。FIG. 2 is a block diagram showing an embodiment of an ultrasonic receiving apparatus according to the present invention, which uses the transducer of FIG. 1;
【図３】図２の実施例における各部の出力を示す特性図
である。FIG. 3 is a characteristic diagram showing an output of each unit in the embodiment of FIG. 2;
【図４】従来の超音波受信装置に用いられる送受波器を
示す図である。FIG. 4 is a diagram illustrating a transducer used in a conventional ultrasonic receiving apparatus.
【図５】図４の送受波器を用いた従来の超音波受信装置
を示すブロック図である。FIG. 5 is a block diagram showing a conventional ultrasonic receiving apparatus using the transducer of FIG.
【図６】図４の送受波器に対する指向角θと受信信号の
位相差を示す図である。6 is a diagram showing a directional angle θ with respect to the transmitter / receiver of FIG. 4 and a phase difference between received signals.
【図７】従来の超音波受信装置に用いられる他の送受波
器を示す図である。FIG. 7 is a diagram showing another transducer used in a conventional ultrasonic receiving apparatus.
１ 送受波器 ２,３,８ 増幅器 ４ 加算器 ５,７ 整流器 ６ 位相検出器 ９ 減算器 １０ 絶対値整流回路 １１,１２ 振動子群 DESCRIPTION OF SYMBOLS 1 Transceiver 2,3,8 Amplifier 4 Adder 5,7 Rectifier 6 Phase detector 9 Subtractor 10 Absolute value rectifier circuit 11,12 Transducer group
Claims (2)
つ平行に配列した第１の振動子群と、第１の振動子群の
各振動子エレメントに隣接してそれぞれ振動子エレメン
トを平行に配列した第２の振動子群とからなり、第１の
振動子群の配列中心と第２の振動子群の配列中心は所定
寸法だけずらされている送受波器を用いる超音波受信装
置において、 第１の振動子群の受信信号と、第２の振動子群の受信信
号とを合成する受信信号合成回路と、 第１の振動子群の受信信号と、第２の振動子群の受信信
号との位相差を検出する位相差検出回路と、 位相差検出回路が検出した位相差に基づく補正分を受信
信号合成回路の出力に加え、サイドローブを減少させる
補正回路とを有することを特徴とする超音波受信装置。1. A first vibrator group in which a plurality of vibrator elements are arranged at equal intervals and in parallel, and each vibrator element is arranged in parallel adjacent to each vibrator element of the first vibrator group. An ultrasonic receiving apparatus using a transducer which is composed of a second transducer group arranged, wherein the arrangement center of the first transducer group and the arrangement center of the second transducer group are shifted by a predetermined dimension, A reception signal combining circuit for combining a reception signal of the first transducer group and a reception signal of the second transducer group; a reception signal of the first transducer group; and a reception signal of the second transducer group A phase difference detection circuit that detects a phase difference between the phase difference detection circuit and a correction circuit that adds a correction based on the phase difference detected by the phase difference detection circuit to the output of the reception signal synthesis circuit to reduce side lobes. Ultrasonic receiver.
つ平行に配列した第１の振動子群と、第１の振動子群の
各振動子エレメントに隣接してそれぞれ振動子エレメン
トを平行に配列した第２の振動子群とからなり、第１の
振動子群の配列中心と第２の振動子群の配列中心は所定
寸法だけずらされている送受波器を用いる超音波受信装
置において、 第１の振動子群の受信信号を受信する第１の増幅器と、 第２の振動子群の受信信号を受信する第２の増幅器と、 第１，第２の増幅器の出力を加算する加算器と、 加算器の出力を整流する第１の整流器と、 第１，第２の増幅器の出力の位相差を検出する位相検出
器と、 位相検出器の出力を整流する第２の整流器と、 第２の整流器の出力を増幅する第３の増幅器と、 第１の整流器の出力から第３の増幅器の出力を減算する
減算器と、 減算器の減算結果の絶対値を出力する絶対値整流回路と
を有することを特徴とする超音波受信装置。2. A first vibrator group in which a plurality of vibrator elements are arranged at equal intervals and in parallel, and each vibrator element is arranged in parallel adjacent to each vibrator element of the first vibrator group. An ultrasonic receiving apparatus using a transducer that is composed of a second transducer group arranged, wherein the arrangement center of the first transducer group and the arrangement center of the second transducer group are shifted by a predetermined dimension, A first amplifier for receiving a received signal of the first vibrator group, a second amplifier for receiving a received signal of the second vibrator group, and an adder for adding outputs of the first and second amplifiers A first rectifier for rectifying the output of the adder; a phase detector for detecting a phase difference between the outputs of the first and second amplifiers; a second rectifier for rectifying the output of the phase detector; A third amplifier for amplifying the output of the second rectifier; A subtracter for subtracting the output of the amplifier, the ultrasonic receiving apparatus characterized by having an absolute value rectifier circuit for outputting the absolute value of the subtraction result of the subtracter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5040149A JP2862746B2 (en) | 1993-03-01 | 1993-03-01 | Ultrasonic receiver capable of suppressing side lobes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5040149A JP2862746B2 (en) | 1993-03-01 | 1993-03-01 | Ultrasonic receiver capable of suppressing side lobes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06249947A JPH06249947A (en) | 1994-09-09 |
| JP2862746B2 true JP2862746B2 (en) | 1999-03-03 |
Family
ID=12572717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5040149A Expired - Fee Related JP2862746B2 (en) | 1993-03-01 | 1993-03-01 | Ultrasonic receiver capable of suppressing side lobes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2862746B2 (en) |
-
1993
- 1993-03-01 JP JP5040149A patent/JP2862746B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06249947A (en) | 1994-09-09 |
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