Abstract: An applanation tonometry system, for measuring pressure within an eye, the tonometry system comprising: an applanation tonometer device for providing specific applanation pressure to a plurality of locations on an eye; an electrical process controller for measuring pressure within the eye; and a tonometer hands free holder adapted to secure the tonometer device over the eye whilst measuring the pressure within the eye.

Abstract: A method of determining the accuracy of a pressure sensor in a surgical cassette is disclosed. The method involves displacing a diaphragm of the sensor a pre-defined amount of displacement, and measuring the force exerted on the diaphragm by the displacing step. The accuracy of the pressure sensor is determined by comparing the force measured in the measuring step to a pre-defined force for the pre-defined amount of displacement.

Abstract: An applanation tonometry system, for measuring pressure within an eye, the tonometry system comprising: an applanation tonometer device for providing specific applanation pressure to a plurality of locations on an eye; an electrical process controller for measuring pressure within the eye; and a tonometer hands free holder adapted to secure the tonometer device over the eye whilst measuring the pressure within the eye.

Abstract: A restriction indicator for an air cleaner of an internal combustion engine. A bellows-type diaphragm is biased toward a retracted position by a first end of a compression spring. A calibration wheel threadingly engaging the housing supports a second end of the compression spring, such that the restriction indicator can be calibrated by rotation of the calibration wheel. An end of the compression spring is seated on a slanted seating surface so that a plunger is pushed off-center to engage a latch and lock the restriction indicator.

Abstract: A gage mechanism for a blood pressure measuring device or other similar apparatus includes a supported shaft member having one end in contact with an inflatable bellows. A pointer is attached at an opposite end of the shaft and a helically wound spring is attached to the shaft and a supporting structure. As the bellows inflates, the shaft is axially displaced and causes rotation due to the constraint of the helical ribbon spring, causing a corresponding angular deflection of the attached pointer relative to an indicating scale. The mechanism includes a first adjustment member for allowing the pointer to be preset to a zero or calibrated position, and a second adjustment mechanism that controls the amount of angular rotation of the shaft and pointer for a displacement of the bellows.

Abstract: A method of predicting steady, incompressible fluid flow over a given geory is provided. The given geometry is modeled with a plurality of overlapping blocks. Pseudocompressibility equations are solved in an iterative process according to a finite differencing method. The solutions at each overlapped portion are used to update solutions of adjoining blocks. By linking the blocks through overlapping, the solution converges at a faster rate than if each block were solved for independently.

Abstract: The present invention provides apparatus, systems, and methods for accurately calibrating a pressure sensor which is incorporated into a lead, e.g., a pacemaker lead, prior to implant into a patient. A calibration vessel is provided which has a housing which forms a reservoir for containing the portion of the lead having the pressure sensor. The vessel also has a connector for receiving a reference pressure into the reservoir, and a sealable opening for receiving the distal end of the lead that carries the pressure sensor. The calibration vessel can be used in a system comprising an electronic display module and an external pressure reference, for establishing an accurate sensor baseline for zero pressure; and can also be used in a system comprising an electronic display module, a reference pressure input source, and a manometer for establishing an accurate scale factor for the lead pressure sensor.

Abstract: Pressure sensors that are fabricated to sense low pressures are tested and calibrated by providing a controlled gas flow or leak to create a pressure during testing. Rather than placing the pressure sensor in a sealed environment, a controlled leak of a gas is used to induce a stable and controllable pressure region over the pressure sensor during testing. The stable low pressure region is monitored via a sensing tube.

Abstract: An inferred manifold absolute pressure based in part on measured manifold mass air flow is compared with a measured manifold absolute pressure from a MAP sensor and if the rolling average of the difference between the two exceeds either a rich or lean limit, an indicator is energized and a code is stored to identify possible MAP sensor deterioration.

Abstract: A device for detecting perforations in film includes a camera body or other optical instrument body. A pressure plate is disposed at a rear of the body and has a channel that allows access of a sensor output to detect and read film position via the recognition of such perforations in the moving film as it passes through the camera or optical instrument body. The pressure plate maintains the alignment of the film relative to the body. An installation board is aligned and mounted adjacent a rear of the pressure plate. A sensor is attached to the installation board. The sensor is disposed to face a section of the film having perforations through the channel of the pressure plate as the film moves along a film path. The sensor transmits electronic signals corresponding to the position of perforations of the film as the film moves along the film path. The invention provides for the efficient and economical construction of a device having a sensor for detecting perforations in film.

Abstract: A weathering testing machine or the like is provided with improved stabilization of conditions such as temperature and humidity, coupled with more accurate readout from sensors on a moving member in the machine, and other sensors and microprocessors.

Abstract: System for dynamically testing the dimensional accuracy of punched tape. A microprocessor controller and modified capstan drive tape reader are utilized to provide large volume checking of punched tape. Dimensional requirements of the tape are tested dynamically at tape reader speeds.

Abstract: A machine which is capable of cleaning and inspecting motion picture films with respect to splices, tears or breaks, sprocket hole elongation, or the like, includes a supporting frame, a rewind motor assembly and rewind reel, a take up motor assembly and take up reel, and motor control means for controlling the rewind and take up motor assemblies, the motion picture film extending between the rewind reel and take up reel. The machine frame has provision for selectively receiving separate and independent modules along the motion picture film between the rewind and take up reels. Each separate module has a panel which is removably securable to the frame. One of the modules is a motion picture film cleaning module, another is a motion picture film inspecting module, and still another is a capstan module. Each module may differ in construction and operation and be substitutable one for another, although certain modules are preferred.

Abstract: A film inspection apparatus is provided for detecting changes in surface profile of film, e.g., edge breaks sprocket hole tears, poor splices, etc. The film inspection apparatus includes a device mounted above a sapphire film support and having a pair of cantilever jewel carrying members for feeling the surface profile adjacent each edge of a traveling web of film. Each cantilever includes a thin vane which extends into and modulates a respective light beam which is incident upon a respective photocell. Each photocell is connected to a separate channel of a braking circuit to operate a brake for the film driving mechanism when a surface profile is encountered which is to be considered as an unacceptable flaw.