Abstract:
The diffractive optical modulator of the invention includes: a plate having a portion functioning as a first electrode; a spacer layer formed on the plate; and a grating consisting of a plurality of beams having a portion functioning as a second electrode, both ends of the beams being supported on the spacer layer. In the diffractive optical modulator, by adjusting a voltage applied between the first electrode and the second electrode, a distance between the beams and the plate is varied, thereby controlling the diffraction efficiency. An insulating layer is further provided between the plate and the plurality of beams.
Abstract:
Method and apparatus provided for visibly outlining the energy zone to be measured by a radiometer. The method comprises the steps of providing a laser sighting device on the radiometer adapted to emit at least one laser beam against a surface whose temperature is to be measured and positioning said laser beam about the energy zone to visibly outline said energy zone. The apparatus comprises a laser sighting device adapted to emit at least one laser beam against the surface and means to position said laser beam about the energy zone to visibly outline said energy zone. The laser beam may be rotated about the periphery of the energy zone. In another embodiment, a pair of laser beams are projected on opposite sides of the energy zone. The laser beam may be further pulsed on and off in a synchronized manner so as to cause a series of intermittent lines to outline the energy zone. Such an embodiment improves the efficiency of the laser and results in a brighter laser beam being projected.
Abstract:
A system for aiming a remote IR temperature sensing device includes a beam splitter assembly and mirror assembly mounted on opposite sides of the body of the device. Both assemblies provide for adjusting the vertical and azimuthal positions of alignment beams to facilitate the use of inexpensive, low-tolerance parts while providing high accuracy to improve sensitivity, accuracy, and resolution. A dual action trigger initiates temperature measurement and logs currently measured temperature information.
Abstract:
A contamination-resistant, temperature-sensing device for sensing the extent of conductive heat flow from a metal surface. A heat transfer member is mounted to one end of a thermally insulative tube. The heat transfer member has two oppositely facing surfaces, one of which engages the metal surface to receive conductive heat flow therefrom, the other of which radiates transferred heat through the tube. A sensor is mounted to the other end of the tube to detect the extent of heat radiated through the tube and hence the extent of conductive heat flow from the metal surface. The sensing device also includes a housing surrounding the tube and the sensor. In addition, the sensing device includes a variable rate coil spring to allow the heat transfer member to bear against the metal surface at a constant contact force. A controller is electrically coupled to the sensor for controlling the extent of conductive heat flow from the metal surface based on the detected heat radiated through the tube.
Abstract:
An assembly for mounting a focal plane array. The assembly includes a fixture of thermally conductive material having a first substantially planar surface and a second surface. The fixture is attached to the focal plane array at the first surface and to a frame of a housing at the second surface thereof. In a specific embodiment, the assembly further includes a mechanism for aligning the fixture, with the attached array, to the frame and at least one flexible connector for electrically connecting the focal plane array to a circuit board disposed within the housing. In the illustrative embodiment, the alignment mechanism includes a clocking slot in the second surface of the fixture which is adapted to engage a protrusion on the frame.
Abstract:
A contamination-resistant, temperature-sensing device for sensing the extent of conductive heat flow from a metal surface in a method and system are disclosed. A heat transfer member is mounted to one end of a thermally insulative tube. The heat transfer member has two oppositely facing surfaces, one of which engages the metal surface to receive conductive heat flow therefrom, the other of which radiates transferred heat through the tube. A sensor is mounted to the other end of the tube to detect the extent of heat radiated through the tube and hence the extent of conductive heat flow from the metal surface. The sensing device also includes a housing surrounding the tube and the sensor. In addition, the sensing device includes a variable rate coil spring to allow the heat transfer member to bear against the metal surface at a constant contact force. A controller is electrically coupled to the sensor for controlling the extent of conductive heat flow from the metal surface based on the detected heat radiated through the tube.
Abstract:
Method and apparatus are provided for visibly outlining the energy zone to be measured by a radiometer. The method comprises the steps of providing a laser sighting device on the radiometer adapted to emit at least one laser beam against a surface whose temperature is to be measured and positioning said laser beam about the energy zone to visibly outline said energy zone. The apparatus comprises a laser-sighting device adapted to emit at least one laser beam against the surface and means to position said laser beam about the energy zone to visibly outline said energy zone.
Abstract:
A radiation probe includes an optionally cooled tube 10 with a window 22 at one end, and can be traversed across a gas turbine engine combustion chamber 20 by drive means 26. A radiation detector 28 simultaneously measures radiation intensity at a plurality of wavelengths, at each of a succession of positions during the traverse. From this data, local values of radiation levels, grey and non grey absorption coefficients, local temperature and local gas composition and soot concentration are calculated, using a recurrence formula which relates intensities at neighboring positions.
Abstract:
A TEMPERATURE MEASURING DEVICE AND A METHOD FOR TAKING SOLID METAL TEMPERATURES IN A METALLURGICAL FURNACE COMPRISING A TELESCOPING SHIELD MOUNTED IN ALIGNMENT WITH A RADIATION PYROMETER AND WHICH, JUST PRIOR TO A TEMPERATURE MEASUREMENT, EXTENDS INTO THE FURNACE TO A POINT ADJACENT TO THE SLAB. THE SHIELD CAN ALSO BE EXTENDED IN SUCH A MANNER AS TO STRIKE THE SOLID METAL SURFACE WITH SUFFICIENT IMPACT AS TO SHATTER THE SCALE LAYER ON THE SUR-
FACE OF THE METAL, WHICH SCALE IS THEN REMOVED IMMEDIATELY THEREAFTER BY MEANS OF COMPRESSED AIR JETS.