Abstract: The present invention discloses a method and device for imaging based on the electroacoustic effect. The electroacoustic effect takes place when an ultrasonic wave passes through an electrolyte or colloidal suspension. The method and device of the present invention produces images whereby a sound wave is generated at the surface of an object, and, as the wave progresses through the body a voltage is generated in time corresponding to the electroacoustic response of the body at a point in space and time corresponding to the position of the ultrasonic wave in the body. As pulses are launched into the body at different points in space, the signal sensed by an amplifier is used to generate an image.

Abstract: The present invention discloses a method and device for imaging based on the electroacoustic effect. The electroacoustic effect takes place when an ultrasonic wave passes through an electrolyte or colloidal suspension. The method and device of the present invention produces images whereby a sound wave is generated at the surface of an object, and, as the wave progresses through the body a voltage is generated in time corresponding to the electroacoustic response of the body at a point in space and time corresponding to the position of the ultrasonic wave in the body. As pulses are launched into the body at different points in space, the signal sensed by an amplifier is used to generate an image.

Abstract: The melting point of a test substance is determined by placing it in a capillary tube within a heated block. The temperature of the block and sample are gradually increased using an electrical heater. The output of a light emitting diode or solid state laser is coupled into an optical fiber that carries the radiation to the capillary tube containing the test substance. A second fiber that is connected to a detector collects radiation from the capillary tube. At the melting point of a solid, or possibly at the boiling point of a liquid, the light scattering and transmissive properties of the test substance change causing the light signal collected by the second fiber to change. The phase transition point is recorded as a change in the output voltage from the detector. The melting point detector is equipped with a number of ports for capillary tubes, fibers, light emitters and detectors so that many phase transition points of different samples can be determined in one heating cycle.

Abstract: The melting point of a test substance is determined by placing it in a capillary tube within a heated block. The temperature of the block and sample are gradually increased using an electrical heater. The output of a light emitting diode or solid state laser is coupled into an optical fiber that carries the radiation to the capillary tube containing the test substance. A second fiber that is connected to a detector collects radiation from the capillary tube. At the melting point of a solid, or possibly at the boiling point of a liquid, the light scattering and transmissive properties of the test substance change causing the light signal collected by the second fiber to change. The phase transition point is recorded as a change in the output voltage from the detector. The melting point detector is equipped with a number of ports for capillary tubes, fibers, light emitters and detectors so that many phase transition points of different samples can be determined in one heating cycle.

Abstract: A device for detecting changes in surface tension of eluant from a liquid chromatography column has in a preferred embodiment an arrangement for suspending a droplet of liquid eluting from a liquid chromatography column, a pair of electrodes in contact with the droplet, and a meter for measuring a quantity related to the resistance of the droplet of liquid.A method for measuring the surface tension of a liquid includes forming a droplet of the liquid, causing the droplet to be supported by support elements, causing each of a pair of electrodes to come into contact with a different region of the droplet, and measuring a quantity related to the resistance of the droplet.