Abstract: An optical fiber submarine cable includes a fiber optic bundle sealed within a precompressed electrically conductive tube defining a hermetic cavity. An inner layer of helically wound copper-plated steel wires is disposed around the electrically conductive tube. An outer layer of oppositely helically wound copper-plated steel wires is preferably disposed around the inner layer. The wires are tightly wound at a pitch of between 8.degree. and 20.degree. and the outer wires balance the torque from the inner wires. An insulation layer of polyethylene surrounds the outer armor layer. A method of making the cable uses precompression of the tube to increase the strength of the cable.

Abstract: The backup control circuit is used with a main control circuit for a kidney dialysis machine and is operable upon failure of the main control circuit to operate with a predetermined time period to cause closing of a dialysate operate valve and opening of a dialysate bypass valve and/or stopping of a blood pump when an aberrant condition in the dialysate conductivity, temperature, flow or negative pressure are sensed and/or when an aberrant condition of the arterial or venous blood pressure is sensed and/or excessive leakage of blood into the dialysate is sensed. The backup control circuit includes control circuitry for controlling operation of the back-up control circuit, the circuitry having input contacts coupled to sensor inputs to the main control circuit. A time delay circuit has an input coupled to the control circuitry and is operable to initiate a timing cycle for the predetermined time period upon receiving an error signal from the control circuitry.

Abstract: The cuvette rotor assembly is adapted for use in a multistation photometric analyzer of the type wherein several chemical reactions are sequentially monitored over a predetermined time span. Such an assembly includes a ring shaped cuvette rotor having an outer circular periphery, an inner circular periphery, a first side, a second side and cuvette forming slots extending between the sides and into the rotor from the inner periphery toward the outer periphery. A mixture of reagent and sample is urged by centrifugal force into the cuvette forming slots as the rotor is rotated. A fixed beam of light is directed at one side of the rotor as the rotor is rotating and the light that passes through each cuvette as a reaction is taking place therein is sensed and measured.

Abstract: The optical detector is particularly adapted for use with an apparatus for separating blood into its components and is of the type including a centrifuge for centrifuging whole blood to separate same into the components thereof and of the type wherein plasma is withdrawn from the centrifuge through a flexible, light transmitting tubing and the spillover of red blood cells into the plasma withdrawn is monitored by the optical detector. The optical detector comprises a block having a slot across the top face thereof, the inner portion of the slot having a width less than the outer diameter of the tubing which is received in the slot such that when the tubing is pressed into the slot, it is squeezed from a circular cross section to an oval cross section to present two flat portions of the tubing adjacent opposite sidewalls of the slot. A first cavity is situated in the block behing a first sidewall of the slot and a second cavity is situated in the block behind a second sidewall of the slot.

Abstract: The nose seal assembly is utilized in a centrifugal chemical analysis apparatus wherein compressed air and wash water tubings are coupled through the assembly to the nose of an open ended hollow shaft for providing a seal between the nose and the assembly upon relative rotational movement therebetween. The assembly comprises a hollow bushing to which is clamped an annular web pad which is made of Nylatron NSB .RTM. having a high pressure x velocity (PV) factor and a low coefficient of friction. The assembly further includes a heat dissipation disc to which the wear pad is clamped and an elastomeric washer which is cemented to and between the bushing and the heat dissipation disc and which is designed to provide sufficient "give" to enable the assembly to maintain a good seal when the wear surface of the wear pad is not coplanar with the plane of the nose. Also, the nose has a hemi-toroid configuration to enhance sealing with, and to reduce wear of, the wear pad.

Abstract: Cuvette positioning apparatus for use in a spectrophotometer adapted for comparing first and second material samples includes a carrier in which cuvettes to be alternately analyzed are arranged end-to-end. The carrier is reciprocated along a vertical axis to expose the cuvettes in alternation to the monochromatic beam of the apparatus. The rate of reciprocation is selected to avoid cavitation of the samples, and a sinusoidal drive arrangement increases the exposure time of the samples to the light beam and minimizes transit time for optimum measurement efficiency. Circuitry responsive to synchronizing signals derived from the drive arrangement is utilized to form an output signal indicative of the difference in measured characteristics between the samples.

Abstract: A temperature control assembly for a centrifugal chemical treatment apparatus of the type having a temperature monitoring thermistor and a rotor heater. The heater is energized from a power source through a solid state relay. The thermistor is connected in a temperature Wheatstone bridge which delivers a voltage signal to a digital voltmeter. The digital voltmeter generates a binary output which is compared in a computer with a digital command signal from a keyboard unit. The binary computer output is a programmed function of the difference between the keyboard digital temperature command signal and the voltmeter output. This computer output controls a variable duty cycle multivibrator stage which provides a relay-operating signal whose "on" time is in accordance with the difference between the keyboard command temperature and the digital voltmeter output signal. This operating signal is delivered to the relay via an over-temperature and failure detector receiving signals from the digital voltmeter.

Abstract: A high pressure xenon arc illuminator bulb having a sapphire window generates a broad band of ultraviolet, visible and infrared radiation extending from about 180 nanometers to about 2000 nanometers.The emitted radiation in the range from about 180 to about 200 nanometers, in passing through the oxygen in the air, causes the molecules of oxygen in the form O.sub.2 to recombine to produce ozone, O.sub.3. Ozone is toxic.In the invention, a lens barrel, which holds a sapphire condensing lens, is joined to the xenon arc illuminator bulb with a lighttight and also hermetic connection. Thus, the condensing lens is optically rigid with the illuminator bulb and the ozone formed within the lens barrel is not released to the ambient environment, even though its local concentration within the lens barrel becomes high. Furthermore, the ozone confined within the lens barrel acts as an absorption filter for all of the wavelengths in the 180 to 200 nanometer band which are capable of producing ozone.

Abstract: A rotary sample changer for a spectrofluorometer has a revolving turret base which can be indexed and which carries an interchangeable sample carrier. Different sample carriers accommodate test cells, test tubes and cuvettes of different sizes and shapes.The revolving turret base and the interchangeable rotary sample carriers are constructed of material having good thermal conductivity and rotate on a large stationary hollow axle which is thermostated by thermally controlled internal fluid circulation to act as a heat source or sink to the samples. Thus, the sample carriers can readily be interchanged without disturbing the plumbing by which the thermostatic fluid is circulated.The revolving turret base is detented at the stations to which it is indexed without kinematic ambiguity and without application of any cocking force. Two spring biased ball detents, symmetrically spaced 180.degree. about the axis of rotation, are provided.

Abstract: A spectrofluorometer providing wavelength correction by means of an arbitrary function generator driven by a wavelength scanning element of the spectrofluorometer. The arbitrary function generator may be driven by the emission scanning monochromator to derive a wavelength-dependent voltage signal which is combined with the measure photomultiplier output to thereby provide a base-line compensated resultant output signal. Alternatively, the arbitrary function generator may be driven by the excitation scanning monochromator to derive a wavelength-dependent voltage signal which is combined with the output of a reference photomultiplier tube receiving part of the output of the excitation monochromator to derive an excitation-corrected reference signal which is in turn combined with the measure photomultiplier tube output signal to thereby provide an energy-corrected resultant output signal.

Abstract: A method and means for suppressing ozone generated by high pressure xenon arc lamps and similar luminous discharge arc lamps of a type normally generating ozone. The ozone-generating lamp is enclosed in a gas-tight housing having a quartz or sapphire light emission window able to transmit light including ultraviolet. The housing has metal cover plates on its various sides acting as heat sinks, each of which has a large number of external heat-radiating fins. Clearance is provided inside the housing sufficient to cause the ozone formed by short wavelengths to be broken down by thermal contact with the lamp and to be thus converted into stable O.sub.2. The heat generated by the lamp in the housing is transferred to the walls of the housing and is dissipated by the external heat-radiating fins. The inner surfaces of the cover plates are blackened to absorb waste light.

Abstract: A method and means for suppressing ozone generated by high pressure xenon arc lamps and similar luminous discharge arc lamps of a type normally generating ozone. The ozone-generating lamp is enclosed in a gas-tight housing having a quartz or sapphire light emission window able to transmit light including ultraviolet. The housing has metal cover plates on its various sides acting as heat sinks, each of which has a large number of external heat-radiating fins. Clearance is provided inside the housing sufficient to cause the ozone formed by short wavelengths to be broken down by thermal contact with the lamp and to be thus converted into stable O.sub.2. The heat generated by the lamp in the housing is transferred to the walls of the housing and is dissipated by the external heat-radiating fins. The inner surfaces of the cover plates are blackened to absorb waste light.