Philip N Rogers

US Patent:

48757705, Oct 24, 1989

Filed:

Mar 23, 1987

Appl. No.:

7/028840

Inventors:

Philip L. Rogers - Granada Hills CA
Milton Rogers - Baltimore MD

Assignee:

Lockheed Corporation - Calarasas CA

International Classification:

G01C 308

US Classification:

356 285

Abstract:

A laser doppler velocimeter system for wind shear detection comprising means for generating a beam of radiant energy, an optical system coupled to the beam for directing a first portion of the beam a predetermined distance to a scatterer of radiant energy, means coupled to the beam for conducting a second portion of the beam through a polarization preserving medium, the length of the medium substantially matching the predetermined distance, means for mixing the second portion of the beam with the radiant energy reflected by the scatterer and means coupled to the means for mixing for measuring a component of the velocity measurements of the scatterer. The velocity includes both horizontal and vertical components. The system may also be adapted for measurement of multiple predetermined distances by using multiple means for conducting a second portion of the beam, each of said multiple means having a length substantially matching one of the multiple predetermined distances. The beam of radiant energy used may be an infrared laser.

US Patent:

45726671, Feb 25, 1986

Filed:

Dec 8, 1981

Appl. No.:

6/328476

Inventors:

Philip L. Rogers - Granada Hills CA

Assignee:

Lockheed Corporation - Burbank CA

International Classification:

G01N 2164

US Classification:

356317

Abstract:

Induced fluorescence of air molecules is used to determine air data parameters such as barometric altitude. The air molecules at a sample location are caused to fluoresce by means of a suitable energy source. A detector having an effective field of view including the sample location measures the fluorescence emitted by the air molecules in the detection sample (the portion of the fluorescing region viewed by the detector). By the use of appropriate filters and/or appropriate selection of the energy source, it is possible to measure fluorescence only from a particular type of air molecule. Since the measured intensity is proportional to the number of excited air molecules, it is possible to compute the density of the air, the static pressure of the air, the partial density and pressure of any individual molecular species, and/or the barometric altitude. Accordingly, many critical air data parameters may be measured by means of equipment contained wholly within the skin of an aircraft, without requiring any pressure ports communicating with the external environment. If the fluorescing energy is switched on and off, an exponential decay of the fluorescence occurs, with mean fluorescence lifetime varying with the density of the fluorescing molecules.

US Patent:

45069794, Mar 26, 1985

Filed:

Dec 8, 1981

Appl. No.:

6/328721

Inventors:

Philip L. Rogers - Granada Hills CA

Assignee:

Lockheed Corporation - Burbank CA

International Classification:

G01P 336
G01J 330

US Classification:

356 285

Abstract:

A uniquely configured radiation fringe velocimeter is used to measure all three components of velocity remotely from a single point. The device is particularly intended for utilization aboard an aircraft, in which case the velocity being measured may be that of aerosol particles or other scattering centers in the free airstream at a location spaced apart from the surface of the aircraft and thus for the most part, free from any associated turbulence effects, etc. The device utilizes known optical techniques for splitting and modulating coherent light into three beam pairs focused onto a common detection volume such that three sets of three-dimensional fringe plane patterns are formed at the detection volume, each of the three sets being aligned along a different fringe plane normal vector and moving in the direction of the corresponding fringe plane normal vector at a different predetermined apparent velocity and/or fringe spacing whereby each of the three different sets of fringe patterns will modulate the intensity of the radiation scattered by an aerosol particle at a fixed location within the detection volume with a characteristic modulation frequency. The beams are oriented with respect to one another at the detection volume such that no two of the three normal vectors associated with the three sets of fringe planes are mutually orthogonal and that all three do not all lie on the same plane.

US Patent:

44836147, Nov 20, 1984

Filed:

Mar 22, 1982

Appl. No.:

6/360500

Inventors:

Philip L. Rogers - Granada Hills CA

Assignee:

Lockheed Corporation - Burbank CA

International Classification:

G01P 336
G01J 330
G01N 2100

US Classification:

356 285

Abstract:

A radiation fringe velocimeter subsystem and a subsystem for determining air density related parameters, are combined into a single optical system (20) which permits various important parameters associated with the operation of an aircraft to be measured at a sample location at a sufficient distance from the aircraft (or any physical attachment thereto) so that the measurements will not be subject to systemic errors such as those caused by air compression effects and airflow disturbances, and which does not require that any Pitot tubes, pressure ports or other similar mechanical devices protrude into the airstream where the measurements are to be made. The combined system (20) contains a laser (32) or other suitable source of radiation (14) as well as an optical arrangement (36, 38, 40) for transmitting the radiation from the laser (32) to a sample volume (12) in order both to form linearly independent sets of radiation fringes (98, 100) at the sample location as well as to focus the radiation (14) at the sample location so as to cause selected air molecules to fluoresce. The device also contains an optical receiving arrangement (40) for focusing backscattered radiation and fluorescent emissions from the sample volume onto one or more photodetectors (42). By using a radiation source (such as a Q-switched laser) that can be quickly switched between an On state (110) and Off state (112), it is possible to utilize a single photodetector (42), since the backscattered radiation (120) will cease as soon as the radiation is turned off, but the fluorescent emissions (186) will decay exponentially.