Abstract: Density of a sample or its concentration are sensed by a fluidic device hng a nozzle with a divider for emitting the sample and a reference fluid as layers of a single laminar jet. The deflection of the jet in a fixed force field is sensed as an indicator of density or concentration. The same device can measure acceleration transverse to the nozzle axis or attitude in a fixed force field as a function of sensed jet deflection. The sensitivity of the acceleration and attitude sensor is a function of the density of the two selected fluids used in the layered laminar jet.

Abstract: A fluidic accelerometer and electromagnetic transducer formed from a plurty of vertical laminations having a nozzle, a pair of outlets for receiving nozzle fluid and a flexible member as an extension of one of the laminations which forms a vertical wall of said nozzle extending into a chamber between the nozzle and the outlets. The flexible member is responsive to acceleration or electromagnetic forces transverse the nozzle centerline to vary the proportion of nozzle fluid received by each outlet. The flexible member is separated from the horizontal walls of the chamber by a selected small distance to create sufficient viscous shear force to effectuate damping.

Abstract: A fluidic oil viscometer for determining the degradation of machinery lubating oils compares the viscosity of the machinery oil with the viscosity of another fluid, such as air. Both the viscosity of the air and the viscosity of the oil are sensed, using capillary-orifice combination sensors, and the air viscosity reading is amplified using a series of laminar proportional amplifiers to equalize its change in viscosity with that of oil. The outputs of the capillary orifice combination sensors are applied to two different pressure gauges, the difference between these two pressure gauges represents the viscosity breakdown. This difference will be independent of temperature.

Abstract: A temperature compensation device for a fluidic circuit is disclosed. The vice comprises a high gain fluid amplifier having input and feedback resistors. The resistance to fluid flow through the input resistor is dependent upon fluid density, while the resistance to flow through the feedback resistor is dependent upon fluid viscosity.

Abstract: A device for measuring the fugacity of a material, without requiring a separate device to measure temperature, is disclosed, wherein the device is a solid electrolyte probe, with the probe having a passageway therein, and metallic conductor leads on the outside of the probe and on the inside of the probe in the passageway. The metallic conductor leads are in contact with an E.M.F. measuring circuit, with the reference fluid being passed through the passageway. The passageway also includes a capillary restriction therein, and measuring devices are provided to measure the pressure drop of the reference fluid when flowing through the capillary, thereby permitting determination of temperature. The temperature determination combined with the E.M.F. measurement permit determination of the fugacity of the material.

Abstract: The temperature sensors shown utilize a constant frequency fluidic oscillr to excite resonance tubes, whose frequency response is a function of temperature. The outputs of these sensors control a fluidic amplifier, whose output is rectified and filtered to produce a D.C. fluid signal which is a function of the sensed temperature. Different embodiments utilize resonance tubes excited in phase or 180.degree. out of phase to sense the difference between two temperatures or to provide increased sensitivity.

Abstract: A flueric nozzle-baffle combination for remotely measuring the surface terature of either a stationary or moving object. The flueric nozzle opens to a sensing head which is preferably parallel to and opposed from the baffle surface of the object whose temperature is being measured. The back pressure of the fluid flowing through the nozzle is a function of the resistance to flow between the sensing head and the baffle which, in turn, is a function of temperature. If the distance between the sensing head and the baffle surface can be maintained constant, or can be measured by an auxiliary proximity sensor, the temperature may be computed as a linear function of sensed back pressure.

Abstract: A fluidic pyrotechnic initiator capable of initiating a fluid resonator cridge initiator upon receipt of a low pressure input signal. A monostable supersonic wall-attachment fluidic amplifier is used with a control channel to detach the supersonic jet, causing it to impact the resonator tube of the initiator. A vent is provided to keep an over pressure in the control channel from initiating the cartridge.

Abstract: A fluidic flow or pressure regulator which utilizes a linear and a non-lir resistance arranged in parallel supplying control passages to change the direction of a jet as a function of the pressure of an unregulated fluid source. An output means is provided which can supply fluid having pressure which is a desired function of the unregulated pressure, including a constant pressure. One embodiment forms the variable direction jet solely from the two control passages while another embodiment uses the control passages to change the direction of a power jet.

Abstract: A fluidic throttling flow controller for controlling core cooling flow in a uclear reactor. Increased temperature of cooling flow adajcent the core increases the flow adjacent the core and is used to control a focused jet amplifier which in turn controls a vortex valve to reduce flow and shut down the reactor when overheating occurs.

Abstract: A fluid capacitor for liquid use is described comprising a cylinder-pistopring arrangement where the spring constant is made to vary as the viscosity of a fluid, so that a temperature independent RC time constant can be achieved in the systems forced to operate at constant Reynolds number. In one embodiment of the invention a piston containing chamber is allowed to fill with fluid. The pressure of fluid on the movable piston is transmitted in the form of a normal force acting upon a beam which is rigidly supported at both ends, the beam consisting of a flexible material having a high thermal expansion coefficient and being supported by a rigid frame having a low thermal expansion coefficient such that the deflection of the beam is a function of both temperature as well as the applied force.

Abstract: A resistive element for a fluidic system having a load and a supply of wong fluid at a supply pressure which is a constant independent of temperature. The resistive element comprises a housing, of a relatively low temperature coefficient of expansion material such as a steel, enclosing a pair of coplanar plates of predetermined dimensions and fabricated from a relatively high temperature coefficient of expansion material, such as a magnesium alloy. The adjacent walls of the plates define the sidewalls of a channel for fluid flow. The plates are slidably mounted inside the housing so as to vary the width of the rectangular channel at a constant rate in response to incremental variations in the fluid temperature. The constant variation in channel width keeps the Reynolds number of the fluid passing through the channel at a substantially constant value despite small increments in the fluid temperature about its operating temperature.

Abstract: A laminar jet linear accelerometer includes a plenum chamber to which prerized fluid is supplied and a nozzle operatively associated with the chamber for issuing the fluid in the form of a jet. The jet is conducted into another chamber, which is vented to an ambient environment, and output channels, having fluidic output sensors disposed therein, are disposed downstream of the vented chamber. Under non-acceleration conditions, the issued jet uniformly impinges upon the sensors and a zero differential output is sensed and indicated, thereby indicating the absence of an applied acceleration. Under applied acceleration conditions, however, the jet flow is deflected by means of the applied acceleration and consequently, such flow impinges upon the sensors in a non-uniform manner. A differential output is thus sensed and the value or magnitude of the acceleration applied may be determined therefrom.

Abstract: Described herein is a flueric laminar bi-stable amplifier. The device comses essentially a flueric amplifier having a supply nozzle, a pair of outlet nozzles, a pair of control nozzles, vent means located along the axial path of fluid flow and means for providing a supply of pressure to the vent means so as to maintain the vent pressure above ambient pressure. Means are also provided for grounding the control ports and for providing back pressure to the control ports. Essentially, the device is a flueric laminar flip-flop that does not use the Coanda effect, but rather it relies upon the instability of jet position due to vent pressurization. If vent flow is allowed to enter the control region in excess of that demanded by entrainment and the control port is vented to ambient, then any small perturbation will cause more flow to enter one side and less on the other, thereby increasing the pressure differential and causing the jet to deflect more until it reaches a stable position on one side or the other.

Abstract: A laminar fluidic device for sensing fluid properties that affect viscosity s disclosed, the device comprising a source of supply for directing a jet of fluid outwardly from a nozzle, a pair of control channels disposed on opposite sides of the jet of fluid for deflecting the jet in response to a difference in the resistence of one control channel with respect to the other control channel, such resistence difference effecting a pressure differential across the jet, a pair of output channels for receiving the jet of fluid in accordance with the deflection thereof, and vent means disposed between the nozzle and the output channels. Each of the control channels normally exhibits channel resistence equal to the jet edge resistence and this normal channel resistence is brought about through a preselection of the control channel length, which length is contemplated to be approximately 70 times the width of the nozzle.