SU855944A1 - Device for measuring group delay time of ultrasonic delay lines - Google Patents
Device for measuring group delay time of ultrasonic delay lines Download PDFInfo
- Publication number
- SU855944A1 SU855944A1 SU792822944A SU2822944A SU855944A1 SU 855944 A1 SU855944 A1 SU 855944A1 SU 792822944 A SU792822944 A SU 792822944A SU 2822944 A SU2822944 A SU 2822944A SU 855944 A1 SU855944 A1 SU 855944A1
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- SU
- USSR - Soviet Union
- Prior art keywords
- ultrasonic
- measuring
- delay time
- measuring group
- lines
- Prior art date
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
1one
Изобретение относитс к радиоэлектронике и может -использоватьс в устройствах измерени параметров ультразвуковых линий задержки (ЛЗ).The invention relates to electronics and can be used in devices measuring the parameters of ultrasonic delay lines (LZ).
Наиболее близким к предлагае.мому изобретению вл етс устройство дл измерени группового времени запаздывани (УВЗ) ультразвуковых ЛЗ , содержащее генератор перестраивае.мой частоты, подключенный к параллельно соединенным аттенюатору и измер емой ЛЗ, выходы которых соединены со входом усилител , подключенного к осциллографическому индикатору 1.The closest to the proposed invention is a device for measuring the group delay time (UVD) of ultrasonic LZ, containing a tunable frequency generator, connected to a parallel connected attenuator and a measured LZ, the outputs of which are connected to the input of an amplifier connected to oscillographic indicator 1 .
Недостатком этого устройства вл етс низка точность измерени , что св зано с наличием неравномерности амплитудно-частотных характеристик (лЧХ) ЛЗ. На результирующей АЧХ комбинированного сигнала имеет место значительное искажение формы пиков и провалов, что приводит к отличию измеренного значени частотного интервала от действительного и к по влению ощибки в определении ГВЗ. Повышение точности измерени ГВЗ за счет усреднени измеренного частотного интервала между частотными .максимами (минимумами), отсто щими друг от друга на целое число биений, не всегда возможно и допустимо. Например, в случае дисперсионной ЛЗ или при измерении ГВЗ некоторых телевизионных фильтров за счет усреднени на больщом частотном интервале резко возрастаетThe disadvantage of this device is low measurement accuracy, which is associated with the presence of non-uniformity of amplitude-frequency characteristics (LF) LZ. On the resulting frequency response of the combined signal, there is a significant distortion of the shape of the peaks and dips, which leads to a difference in the measured value of the frequency interval from the actual one and to the appearance of a fault in the definition of the GDT. Improving the accuracy of measuring the GVZ by averaging the measured frequency interval between the frequency maxima (minima) that are separated from each other by an integer number of beats is not always possible and permissible. For example, in the case of dispersion LZ or when measuring the GVZ of some television filters, it dramatically increases due to averaging over a large frequency interval.
ошибка в определении истинного закона изменени ГВЗ и падает разрешающа способность . Кроме того, в узкополосных ЛЗ при малом числемаксимумов (минимумов) комбинированного сигнала в полосе проfQ пускани возрастает ошибка в измерении разности частот между соседними максимумами (миниму.мами), которые резко искажаютс за счет высокой крутизны скатов АЧХ. an error in determining the true law of variation of the GD and the resolution decreases. In addition, in narrowband LZ, with a small number of maxima (minima) of the combined signal in the start-up band, an error increases in measuring the frequency difference between adjacent maxima (minima), which are sharply distorted due to the high slope of the frequency response.
Цель изобретени - повышение точностиThe purpose of the invention is to improve the accuracy
tS измерени ГВЗ ультразвуковых ЛЗ.tS measurement of the GDT ultrasonic LZ.
Цель достигаетс те.м, что устро-йство дл измерени ГВЗ ультразвуковых ЛЗ содержит дополнительную калиброванную ЛЗ, включенную последовательно с измер еМ мой ЛЗ.The goal is achieved by the fact that the device for measuring the GDT of ultrasonic LZs contains an additional calibrated LZ, connected in series with the measurement of my LZ.
На чертеже показана блок-схема предлагаемого устройства измерени ГВЗ.The drawing shows a block diagram of the proposed group measurement device.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU792822944A SU855944A1 (en) | 1979-09-28 | 1979-09-28 | Device for measuring group delay time of ultrasonic delay lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU792822944A SU855944A1 (en) | 1979-09-28 | 1979-09-28 | Device for measuring group delay time of ultrasonic delay lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU855944A1 true SU855944A1 (en) | 1981-08-15 |
Family
ID=20852020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU792822944A SU855944A1 (en) | 1979-09-28 | 1979-09-28 | Device for measuring group delay time of ultrasonic delay lines |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU855944A1 (en) |
-
1979
- 1979-09-28 SU SU792822944A patent/SU855944A1/en active
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