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High-power assembly system
Isolation
mount
~mze
Fibre-optic
Substrate
1
Ref Ieccted li$ht Fig.7
The fibre optic probe and magnetostrictive
probe
of displace~n~ scan going from top to bottom transducer
Similar dynamic displacement ranges can be monitored with the acoustical system. This technique uses a miniature capacitor microphone onto which a 0.030 in (0.7620 mm) diameter acoustical probe is attached. Set up in a manner similar to the optical probe, the microphone system is
able to monitor displacements by measuring the near-field pressure of the welding tip and displaying the sound pressure pattern on an oscilloscope. The sound pressure levels in very close proximity to the welding tip were found to be approximately 100 dB (2 x 10m5N mV2). The probe tube microphone system, a type normally used in the audible frequency range, has been successful in monitoring at up to 60 kHz - the driving frequency for ultrasonic welding. The acoustical technique is particularly useful when the surface of the welding tip does not readily reflect light. The unit may also be used as a manual probe or ‘sniffer’ for locating trouble spots at various points in the system.
~nie~tional BusynessMachines coloration, System Products Division, South Road, Poughkeepsie, NY 12602, USA
NEW EQUIPMENT High-power assembly system Dawe Instruments have introduced the 7038A 1 200 W ultrasonic plastics assembly system. The new system (Fig-l), because of its large power output, is capable of welding large and difficult rigid thermoplastic components which before had either been impossible to weld or else needed several machines. The out ut at the horn tip at a frequency P (1466kgmsl). of2OkHzislO6~lbfsThe 7038A is a complete assembly system that includes ultrasonic generator, pneumatic stand, converter, horn,
and controls in a single rugged unit. Safety features include: non ‘tie-down’ palm buttons on the base panel to keep the operator’s hands away from the work area during operation; emergency stop button; and counterbalanced height control to prevent the head from dropping unexpectedly during setting up. The complete unit (including generator stand, base and column) weighs 220 lb (100 kg). &we ~nst~rne~ts Ltd? Concord Road, WesternAvenue,
London W3 OSD, UK Gas Doppler flowmeter The latest ultrasonic gas Doppler flowmeter from Scarpa ~boratories is based on a break~rou~ in transducer design the manufacturers claim. The breakthrough is believed to represent the first practical means of matching the high impedance of a piezoelectric crystal to the low impedance of a gas in a housing capable of withstanding high pressures, temperatures, and corrosive atmospheres. The transducers radiate a hip-powered beam of ultrasound of small angular dispersion. The flowmeter (Fig.2) features zero pressure drop, a dynamic flow range of 300-l) 0.1% repeatability and an accuracy of 0.5%. Flow velocities from less than l/3 ft s-l (0.1 m s-l) to well over 100 ft s-l (30 m s-l) can be accurately measured in pipes from l-60 in (25- 1 524 mm) diameter or larger. The transducers mount in a 1 in (25 mm), 45 degree angle pipe nipple and do not extend beyond the interior of the pipe wall. The complete instrument consists of the ultrasonic flow head transmitter and a weatherproof receiver and digital ~mputer that performs algebraic, arithmetic and scaling functions to provide either digital or analogue outputs in engineering units. Flow rate indication, either digital or analogue, as well as totalizers, recorders, and millampere outputs are available.
Fig.1
The 7038A
ULTRASONICS.
1 ZOO W plastics assembly system
MARCH 1973
Applications include natural gas production and transmission, chlorine, ~monia, uranium hexafluoride, and air
55
mount
~mze
Fibre-optic
Substrate
1
Ref Ieccted li$ht Fig.7
The fibre optic probe and magnetostrictive
probe
of displace~n~ scan going from top to bottom transducer
Similar dynamic displacement ranges can be monitored with the acoustical system. This technique uses a miniature capacitor microphone onto which a 0.030 in (0.7620 mm) diameter acoustical probe is attached. Set up in a manner similar to the optical probe, the microphone system is
able to monitor displacements by measuring the near-field pressure of the welding tip and displaying the sound pressure pattern on an oscilloscope. The sound pressure levels in very close proximity to the welding tip were found to be approximately 100 dB (2 x 10m5N mV2). The probe tube microphone system, a type normally used in the audible frequency range, has been successful in monitoring at up to 60 kHz - the driving frequency for ultrasonic welding. The acoustical technique is particularly useful when the surface of the welding tip does not readily reflect light. The unit may also be used as a manual probe or ‘sniffer’ for locating trouble spots at various points in the system.
~nie~tional BusynessMachines coloration, System Products Division, South Road, Poughkeepsie, NY 12602, USA
NEW EQUIPMENT High-power assembly system Dawe Instruments have introduced the 7038A 1 200 W ultrasonic plastics assembly system. The new system (Fig-l), because of its large power output, is capable of welding large and difficult rigid thermoplastic components which before had either been impossible to weld or else needed several machines. The out ut at the horn tip at a frequency P (1466kgmsl). of2OkHzislO6~lbfsThe 7038A is a complete assembly system that includes ultrasonic generator, pneumatic stand, converter, horn,
and controls in a single rugged unit. Safety features include: non ‘tie-down’ palm buttons on the base panel to keep the operator’s hands away from the work area during operation; emergency stop button; and counterbalanced height control to prevent the head from dropping unexpectedly during setting up. The complete unit (including generator stand, base and column) weighs 220 lb (100 kg). &we ~nst~rne~ts Ltd? Concord Road, WesternAvenue,
London W3 OSD, UK Gas Doppler flowmeter The latest ultrasonic gas Doppler flowmeter from Scarpa ~boratories is based on a break~rou~ in transducer design the manufacturers claim. The breakthrough is believed to represent the first practical means of matching the high impedance of a piezoelectric crystal to the low impedance of a gas in a housing capable of withstanding high pressures, temperatures, and corrosive atmospheres. The transducers radiate a hip-powered beam of ultrasound of small angular dispersion. The flowmeter (Fig.2) features zero pressure drop, a dynamic flow range of 300-l) 0.1% repeatability and an accuracy of 0.5%. Flow velocities from less than l/3 ft s-l (0.1 m s-l) to well over 100 ft s-l (30 m s-l) can be accurately measured in pipes from l-60 in (25- 1 524 mm) diameter or larger. The transducers mount in a 1 in (25 mm), 45 degree angle pipe nipple and do not extend beyond the interior of the pipe wall. The complete instrument consists of the ultrasonic flow head transmitter and a weatherproof receiver and digital ~mputer that performs algebraic, arithmetic and scaling functions to provide either digital or analogue outputs in engineering units. Flow rate indication, either digital or analogue, as well as totalizers, recorders, and millampere outputs are available.
Fig.1
The 7038A
ULTRASONICS.
1 ZOO W plastics assembly system
MARCH 1973
Applications include natural gas production and transmission, chlorine, ~monia, uranium hexafluoride, and air
55