- Email: [email protected]
Acoustic probe locates noise
the tow-hook latches onto the towbar of the stuck crawler. This engagement automatically releases the brake on the stuck crawler and reverses the drive on the recovery crawler. The two, now coupled, reverse out of the pipe. Suitable for pipelines from 46-cm diameter upwards, the recovery device has already been proved in field trials, and was put into operation during the 1980 gas pipeline laying season.
operator to be carried out. Typical applications might be the diagnosis of valve chatter, tappet noise, piston slap etc on a car engine, but it can be used on any machinery where noise location is a problem. The device costs £250 ex works Bury in the UK.
Two springs impose a torsional couple on the strip and, when the cracks have propagated sufficiently far, cause it to flip over. The 'life' of the device is specified by a characteristic curve of displacement (proportional to the loading of the structure) against number of load cycles.
SPM Instrument UK Limited, PO Box 14, Bury,, Lancs, BL8 2AG, UK
Soci#t~ Technique d'Accessoires Specialists SA, 77 Rue HenriBrisson, 78500 SaFtrouville, France
Image intensifier testing system
Metal and Pipeline Endurance Limited, Taylors Road, Stotfold, Hitchin, HeFts, SG5 4AG, UK
X-ray image intensifier tubes A new family of high-performance X-ray image intensifier tubes has been announced by Thomson-CSF. These 'E' Technology tubes are characterized in particular by high quantum detection efficiency achieved by use of a detector screen having extremely high X-ray absorption (78 % at HVL 7 mm AI). A significant step forward in quantum noise reduction, even at low X-ray dosage, is claimed for the tubes, along with an increased conversion factor, high resolution and an excellent contrast ratio, making it possible to obtain a greater dynamic range when using film with a low gamma. Tubes with input fields of 15, 16, 17, 22, 30, 32 and 40 cm are available in either single field, or Electronic Zoom double field, or triple field versions. The company states that these new image intensifiers enhance diagnostic possibilities where high-quality pictures are required from an imaging system (35-cm cineradiography, 70-mm or 105-ram film recording and -rv Fluoroscopy).
SPM°sAcoustic Probe in use for fault location
Fatigue loading indicator STAS has introduced a simple, entirely mechanical device which provides an indication of the cumulative fatigue loading history of a structure. The principal component of the device, termed a 'Fatigue damage indicator' by the company, is a thin metal strip mounted on bearings which are fixed to the structure to be supervised. In the centre of the strip, a small area of a few square millimetres is provided with four very fine notches from which fatigue cracks propagate into the strip as the structure is subjected to loading.
In response to the increasing demand for objective means of assessing the quality of electrooptical systems used to detect images at very low light levels, Sira Institute has developed a new image intensifier testing system. The system is based on Sira's longestablished infrared image evaluation system, which measures the modulation transfer function (MTF) and line spread function of infrared optical systems. The new equipment measures the MTF of image intensifier tubes or of systems employing image intensifier tubes. The measurement is made over a relatively large tube area, thus overcoming the problem of 'sampled images' produced by tubes incorporating fibre plates and/or channel multipliers. Tubes with channel multipliers also suffer from significant local fluctuations in brightness of the output image, thus further necessitating large-area measurement. The Sira image intensifier testing system consists of three basic units: a target generator, a Fourier analyser, and an electronic control unit. The target generator, which incorporates a tungsten halogen light
Thomson-CSF, Division Tubes Electroniques, 38 Rue Vauthier, 92100 Boulogne-Billancourt, France
Acoustic probe locates noise SPM Instrument has produced a simple, subjective device for quick and easy location of noise sources. The Acoustic Probe, which the company describes as a 'sensitive electronic listening stick', is extremely simple to use, battery-operated, with a series of extension pins enabling investigations of noisy machinery up to one metre from the
NDT INTERNATIONAL . AUGUST 1981
An STAS "fatigue ring' incorporating their 'fatigue damage indicator'
199
operator to be carried out. Typical applications might be the diagnosis of valve chatter, tappet noise, piston slap etc on a car engine, but it can be used on any machinery where noise location is a problem. The device costs £250 ex works Bury in the UK.
Two springs impose a torsional couple on the strip and, when the cracks have propagated sufficiently far, cause it to flip over. The 'life' of the device is specified by a characteristic curve of displacement (proportional to the loading of the structure) against number of load cycles.
SPM Instrument UK Limited, PO Box 14, Bury,, Lancs, BL8 2AG, UK
Soci#t~ Technique d'Accessoires Specialists SA, 77 Rue HenriBrisson, 78500 SaFtrouville, France
Image intensifier testing system
Metal and Pipeline Endurance Limited, Taylors Road, Stotfold, Hitchin, HeFts, SG5 4AG, UK
X-ray image intensifier tubes A new family of high-performance X-ray image intensifier tubes has been announced by Thomson-CSF. These 'E' Technology tubes are characterized in particular by high quantum detection efficiency achieved by use of a detector screen having extremely high X-ray absorption (78 % at HVL 7 mm AI). A significant step forward in quantum noise reduction, even at low X-ray dosage, is claimed for the tubes, along with an increased conversion factor, high resolution and an excellent contrast ratio, making it possible to obtain a greater dynamic range when using film with a low gamma. Tubes with input fields of 15, 16, 17, 22, 30, 32 and 40 cm are available in either single field, or Electronic Zoom double field, or triple field versions. The company states that these new image intensifiers enhance diagnostic possibilities where high-quality pictures are required from an imaging system (35-cm cineradiography, 70-mm or 105-ram film recording and -rv Fluoroscopy).
SPM°sAcoustic Probe in use for fault location
Fatigue loading indicator STAS has introduced a simple, entirely mechanical device which provides an indication of the cumulative fatigue loading history of a structure. The principal component of the device, termed a 'Fatigue damage indicator' by the company, is a thin metal strip mounted on bearings which are fixed to the structure to be supervised. In the centre of the strip, a small area of a few square millimetres is provided with four very fine notches from which fatigue cracks propagate into the strip as the structure is subjected to loading.
In response to the increasing demand for objective means of assessing the quality of electrooptical systems used to detect images at very low light levels, Sira Institute has developed a new image intensifier testing system. The system is based on Sira's longestablished infrared image evaluation system, which measures the modulation transfer function (MTF) and line spread function of infrared optical systems. The new equipment measures the MTF of image intensifier tubes or of systems employing image intensifier tubes. The measurement is made over a relatively large tube area, thus overcoming the problem of 'sampled images' produced by tubes incorporating fibre plates and/or channel multipliers. Tubes with channel multipliers also suffer from significant local fluctuations in brightness of the output image, thus further necessitating large-area measurement. The Sira image intensifier testing system consists of three basic units: a target generator, a Fourier analyser, and an electronic control unit. The target generator, which incorporates a tungsten halogen light
Thomson-CSF, Division Tubes Electroniques, 38 Rue Vauthier, 92100 Boulogne-Billancourt, France
Acoustic probe locates noise SPM Instrument has produced a simple, subjective device for quick and easy location of noise sources. The Acoustic Probe, which the company describes as a 'sensitive electronic listening stick', is extremely simple to use, battery-operated, with a series of extension pins enabling investigations of noisy machinery up to one metre from the
NDT INTERNATIONAL . AUGUST 1981
An STAS "fatigue ring' incorporating their 'fatigue damage indicator'
199