Apparatus for detecting an abnormality such as a discontinuity in a predetermined region of a material by directing an elastic mechanical wave, such as an ultrasonic or other acoustic wave, in a series of pulses to portions of the region and providing response to the wave pulses reflected therefrom. The amplitudes of pulses reflected from a normal portion of the region may approximate the amplitudes of pulses reflected from a portion where an abnormality is present and thus make it difficult to ...

Laboratory identification of Neisseria gonorrhoeae is facilitated through distribution of sterile, self-administrable, fibrous catamenial swab devices, transportable containers and holding media to asymptomatic individuals for anonymous use and submission of subculture specimen samples to a clinical testing station. The containers are marked with coded references which allow the individual or her authorized representative to anonymously inquire as to the determination made on the transported swa...

The apparatus comprises a collector assembly having a passage filled with a solid adsorbant which is capable of adsorbing the specific vapour together with other vapours in the atmospheric sample and which is also capable of being readily heated to desorb the adsorbed vapours. The outlet of the passage of the collector assembly is connectable to a partition column, which separates the desorbed vapours. The partition column is connected to a detector, which detects the specific vapour among the v...

Liquid level detection apparatus and other apparatus comprising in common an elongated flexible substrate transducer which can extend into a liquid containing vessel or be applied to other pressure or force measurement tasks and provide an accurate indication of liquid level or other pressure or force related parameter through a voltage drop measurement made through an elongated, e.g., sinuous or other regular pattern (or of irregular patterning to localize areas of highest sensitivity) conducto...

A method is disclosed for detecting the formation of or presence of light-interacting domains, e.g. particles or clumps of particles, in a supporting medium which comprises: disposing the supporting medium between a source of multipoint illumination and a scintillation detector, illuminating the supporting medium with a multiplicity of discrete light beams directed through the medium toward the scintillation detector; and causing relative motion between the light beams and the supporting medium....

A method is disclosed for detecting the formation of or presence of light-interacting domains, e.g. particles or clumps of particles, in a supporting medium which comprises: disposing the supporting medium between a source of multipoint ilumination and a scintillation detector, illuminating the supporting medium with a multiplicity of discrete light beams directed through the medium toward the scintillation detector; and causing relative motion between the light beams and the supporting medium. ...

A detecting circuit comprises a magnetic core having a rectangular magnetic characteristic, a first winding coupled magnetically to the magnetic core, for applying a current to be detected, and a second winding coupled magnetically to the magnetic core, for applying a reference current. An output signal is derived from the second winding.

A detecting system for detecting the ends of hot steel billets. At least two and preferably three photoelectric detectors have adjacent fields of view. An electric circuit is arranged to signal when the output of one detector, the middle of the three, exceeds half the output of either of the other detectors. Other logical functions are provided to sense the beginning and end of a billet reliably.

Apparatus for sensing or detecting, in an open-sided cavity of a container or nest for supporting an article having a peripheral wall of a uniform height, the presence or non-presence of such an article in said cavity and, if the presence of such an article is sensed or detected, whether the article is correctly or uniformly seated or positioned in the cavity. A reference or fixed probe and a plurality of actuable probes extend towards said cavity from a detector or detector assembly positioned ...

An optical sensor for detecting the housing state such as the thickness of a substrate in the present invention is provided at supporting arms. The supporting arms are attached to a supporting shaft. The supporting arms are in a vertical state in a state before detection of the substrate, but when detecting, the supporting shaft rotates to bring the supporting arms into a horizontal state so that the optical sensor enters a substrate housing body and is set at a predetermined detection position....