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We have constructed a torsional resonance apparatus for contact‐free measurements of the electrical conductivity of solids. Owing to its use of modulation spectroscopy, the technique achieves considerable enhancement of sensitivity compared to previous contactless methods. Conductivities in the...
Sodium silicate may be used to make reliable transducer bonds for ultrasonics experiments near room temperature.
Most operable Laser Doppler Anemometry (LDA) systems employ the fringe mode geometrical configuration with a counting type signal processor. The fringes are contained within an ellipsoid volume, which is commonly described as the sensing volume of the LDA. Generally, the dimensions of the...
A continuous‐temperature infrared calibrator is designed and constructed for providing reference video signals in temperature measurement using an infrared scanner. The calibrator can be controlled for a wide range of temperature settings and to present a continuous span of reference signals...
A failure analysis technique for reconnecting aluminum metallization on planar IC devices is described. The technique, utilizing a conductive paint deposited on the device surface, is nondestructive and easily removable.
A method is described for building a low‐voltage‐drift differential dc amplifier featuring automatic zero adjustment, a high input impedance, and a bandwidth of 10 kHz. This is achieved by an asymmetric two‐step process between the input signal and ground. Bandwidth can be extended by the...
A cw Mach Zehnder multichannel interferometer has been developed to measure time‐dependent fractional fringe shifts with an accuracy of one‐fortieth fringe. The design is quasi‐quadrature in that known phase shifts, introduced in the reference beam, are time multiplexed with the normal...
The theory is given of the voltage output of a Rogowski coil excited by a current pulse flowing along the axis of the coil. In this theory the Rogowski coil is considered as a delay line. The results do not differ from those obtained usually by considering the coil as a voltage source d ϕ/ d t...
A simple, low‐cost conductance bridge circuit, which provides high‐resolution measurements of d I / d V and d 2 I / d V 2 for a voltage‐biased load, is presented. A resolution in d I / d V for a 90‐Ω tunnel junction of several parts in 10 5 has been measured using a 35‐μV‐rms...
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