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Ultrasonic tester for concrete
NEW EQUIPMENT
DRILLING AND MILLING OF CERAMICS Two r o t a r y uRrasonic machines for working c e r a m i c and g l a s s components, as well as metal, have now been made c o m m e r c i a l l y available after s e v e r a l y e a r s of operational work with the prototypes. A r i s ing from an original idea at AERE Harwell, Sonimill and Sonidrill have been finally developed with additional facilities by McLean Research, Sonidrill being designed for s m a l l e r scale machining.
change, eliminating false a l a r m s due to swaying c u r tains etc. This system, the Systron Donner UD-6, incorporates all the advantages of ultrasonic sensing, such as p r e cise confinement of the protected area and failsafe design. Systron Donner Ltd, St M a r y ' s Rd, Sydenham Industrial Estate, Leamington Spa, Warwickshire, UK
ULTRASONIC TESTER FOR CONCRETE
The s y s t e m s a r e based on a 150 watt Sonorode t r a n s ducer f r o m K e r r y Ultrasonics Ltd, into which is fitted a diamond abrasive cutting tool of an appropriate shape. Combined r o t a r y and ultrasonic (nominal frequency 20kHz) vibrations, provide the required cutting action. The downward feed of the head is controlled by a sensitive hydraulic s y s t e m applied to a counterweight, the head being self-returning. Maximum heights of workpieces which can be a c c o m modated a r e about 410mm and 220mm for Sonimill and Sonidrill respectively.
A new ' P o r t a b l e Ultrasonic Non-destructive Digital Indicating T e s t e r ' , known as PUNDIT (Fig 2), is announced, for use on site to indicate variations in quality of concrete and cement. The two t r a n s d u c e r s for this t h r o u g h - t r a n s m i s s i o n instrument use high sensitivity lead zirconate titanate c e r a m i c s at an operating frequency near 50kHz. A c c u r a c y is to 1/2 or 1 m i c r o s e c o n d (switchable) for material of thickness between 0.1 and 10 m e t r e s .
McLean R e s e a r c h Engineering Co Ltd, Hungerford, Berks, UK
C. N. S. Instruments Ltd, 61-63 Holmes Rd, London NW5, UK
BURGLAR ALARMFOR UK MARKET
A new ultrasonic intrusion-sensing device (Fig 1) is now immediately available in the UK. Based on the established principle of detecting certain movements by their Doppler effect, an a r e a up to 800m 2 (7,500ft 2) is filled with sound energy at 19.2kHz by mounting transmitting ' t w e e t e r s ' in the protected area. Receiving tweeters detect the 19.2kHz signal returning, and should it be shifted by the Doppler effect by an amount near 40 cycles, an a l a r m condition is caused. Movements other than human tend to set up f r e quency-changes of a different o r d e r to the 40-cycle
Fig 2 Portable ttltrasonic t e s t e r in operation on a c o n c r e t e sample
MODULAR ULTRASONIC TESTER
Fig 1 Burglar a l a r m unit with c o v e r and t r a n s m i t / r e c e i v e t r ~ n ~ l u c e r pair ('tweeter')
A new British flaw detector (Fig 3) is announced by Ultrasonoscope, with applications in both the industrial and medical fields. Known as the Series 10 modular equipment, it consists of three main plug-in units: the amplifier module, the t i m e - b a s e module and the a l a r m module. These provide standard frequency ULTRASONICS April 1971
71
DRILLING AND MILLING OF CERAMICS Two r o t a r y uRrasonic machines for working c e r a m i c and g l a s s components, as well as metal, have now been made c o m m e r c i a l l y available after s e v e r a l y e a r s of operational work with the prototypes. A r i s ing from an original idea at AERE Harwell, Sonimill and Sonidrill have been finally developed with additional facilities by McLean Research, Sonidrill being designed for s m a l l e r scale machining.
change, eliminating false a l a r m s due to swaying c u r tains etc. This system, the Systron Donner UD-6, incorporates all the advantages of ultrasonic sensing, such as p r e cise confinement of the protected area and failsafe design. Systron Donner Ltd, St M a r y ' s Rd, Sydenham Industrial Estate, Leamington Spa, Warwickshire, UK
ULTRASONIC TESTER FOR CONCRETE
The s y s t e m s a r e based on a 150 watt Sonorode t r a n s ducer f r o m K e r r y Ultrasonics Ltd, into which is fitted a diamond abrasive cutting tool of an appropriate shape. Combined r o t a r y and ultrasonic (nominal frequency 20kHz) vibrations, provide the required cutting action. The downward feed of the head is controlled by a sensitive hydraulic s y s t e m applied to a counterweight, the head being self-returning. Maximum heights of workpieces which can be a c c o m modated a r e about 410mm and 220mm for Sonimill and Sonidrill respectively.
A new ' P o r t a b l e Ultrasonic Non-destructive Digital Indicating T e s t e r ' , known as PUNDIT (Fig 2), is announced, for use on site to indicate variations in quality of concrete and cement. The two t r a n s d u c e r s for this t h r o u g h - t r a n s m i s s i o n instrument use high sensitivity lead zirconate titanate c e r a m i c s at an operating frequency near 50kHz. A c c u r a c y is to 1/2 or 1 m i c r o s e c o n d (switchable) for material of thickness between 0.1 and 10 m e t r e s .
McLean R e s e a r c h Engineering Co Ltd, Hungerford, Berks, UK
C. N. S. Instruments Ltd, 61-63 Holmes Rd, London NW5, UK
BURGLAR ALARMFOR UK MARKET
A new ultrasonic intrusion-sensing device (Fig 1) is now immediately available in the UK. Based on the established principle of detecting certain movements by their Doppler effect, an a r e a up to 800m 2 (7,500ft 2) is filled with sound energy at 19.2kHz by mounting transmitting ' t w e e t e r s ' in the protected area. Receiving tweeters detect the 19.2kHz signal returning, and should it be shifted by the Doppler effect by an amount near 40 cycles, an a l a r m condition is caused. Movements other than human tend to set up f r e quency-changes of a different o r d e r to the 40-cycle
Fig 2 Portable ttltrasonic t e s t e r in operation on a c o n c r e t e sample
MODULAR ULTRASONIC TESTER
Fig 1 Burglar a l a r m unit with c o v e r and t r a n s m i t / r e c e i v e t r ~ n ~ l u c e r pair ('tweeter')
A new British flaw detector (Fig 3) is announced by Ultrasonoscope, with applications in both the industrial and medical fields. Known as the Series 10 modular equipment, it consists of three main plug-in units: the amplifier module, the t i m e - b a s e module and the a l a r m module. These provide standard frequency ULTRASONICS April 1971
71