|Published (Last):||26 January 2005|
|PDF File Size:||10.60 Mb|
|ePub File Size:||18.20 Mb|
|Price:||Free* [*Free Regsitration Required]|
An InGaAs photocathode Image Intensifier is used to pass an amplified signal from a screen The InGaAs image intensification tube is optically coupled to an imaging device for passing output light.
The output light from the InGaAs tube is transformed by an electronic circuit producing a desired signal output The signal output from the electronic circuit may be further enhanced into an enhanced signal output The enhanced signal output may be formatted into a form for viewing or may be saved.
Provisional Application Serial No. Technical Field  This invention relates generally to the field of imaging systems and more specifically to an InGaAs image intensification camera system. Background Art  Multiple sensor imaging systems generate an image of an object by fusing data that is collected using multiple sensors.
Gathering image data using multiple sensors, however, has posed challenges. In some systems, the sensors detect light received from separate apertures. Data generated from light from separate apertures, however, describe different points of view of an object that need to be reconciled in order to fuse the data into a single image. Additionally, using separate apertures for different sensors may increase the bulk of an imaging system. Reflective and refractive elements are typically used to direct the light to different sensors.
For example, the system described in U. Each individual sensor, however, detects only a component of light, for example, only specific wavelengths of light, and thus cannot generate image data from the full spectrum. Additionally, multiple reflective and refractive elements may add to the bulk and weight of an imaging system. Consequently, gathering image data from multiple sensors has posed challenges for the design of imaging systems. Examples of such image intensifier tubes are found in U.
Therefore, a need has arisen for new methods and systems for gathering image data using multiple sensors. The InGaAs photocathode Image Intensifier is used to pass an amplified signal from a screen in a manner well known in the art of image intensifier tubes.
The InGaAs image intensification tube is optically coupled to an imaging device for producing an output optical signal or light from the. The output signal from the InGaAs tube is transformed by an electronic circuit into a desired signal output.
The signal output from the electronic circuit optionally may be further enhanced into an enhanced signal output. The enhanced signal output is then formatted into a form for viewing or may be saved. A technical advantage of one embodiment is that an InGaAs camera can be synchronized to an internal or external timing source.
Consequently, embodiments of the present invention provide a system and method for gathering image data from multiple sensors in an effective and compact manner. Through this reference, it can be seen how the above cited features, as well as others that will become apparent, are obtained and can be understood in detail.
The drawings nevertheless illustrate only typical, preferred embodiments of the invention and are not to be considered limiting of its scope as the invention may admit to other equally effective embodiments. In all the drawings, identical numbers represent the same elements.
System receives light or an energy signal reflected from an object and gathers information from the light or input signal to generate an image of object on a display System may include an outer casing having an aperture through which light enters. Outer casing may have any suitable shape such as a cylinder having a diameter in the range of cm, for example, approximately 10 cm, and a length in the range of cm, for example, approximately 14 cm.
System may also include an inner assembly coupled to outer casing with braces as illustrated in FIG. Referring to FIG. Inner casing may have any suitable shape such as a cylinder having a diameter in the range of 3 to 6 cm, for example, approximately 4. Optics focuses light reflected from object onto sensor Optics may include, for example, a lens comprising glass or polymer having a radius in the range of 3 to 5 cm, for example, approximately 4 cm, and a focal length in the range of mm, for example, approximately 22 mm.
Optics , however, may include any suitable optical element or configuration of optical elements for focusing light from object onto sensor Sensor  detects the light reflected from object directly through aperture , that is, through an uninterrupted pathway. Sensor may be placed such that sensor receives light generally in a direction that light travels from object to aperture Sensor may detect certain types of energy, for example, infrared energy, of the light.
Sensor may enhance certain features of light or the signal such as, for example, an image intensifier tube or sensor. Sensor , however, may comprise any suitable sensor, for example, a long wave infrared sensor, a low light level charge coupled device LLLCCD , or a complementary metal-oxide semiconductor CMOS sensor. A tube design generally would receive IR light and produce a visible light output signal, whereas a sensor design would receive visible light.
Sensor  generates sensor data set S1 in response to the received light or input energy signal. Sensor data set S1 may include values assigned to pixels corresponding to points of light, where the values represent image information such as brightness or color associated with the points of light. Sensor transmits sensor data set S1 to a fusing module System  may also include an outer assembly comprising reflective surfaces and and a sensor Reflective surface and sensor may be coupled to outer casing , and reflective surface may be coupled to inner casing Any suitable configuration, however, may be used, for example, outer assembly may be configured as a Schmidt-Cassegran catadioptric optical assembly, a diffractive optical system, or any combination of suitable configurations.
Reflective surface  receives light or the input energy signal from object through aperture and reflects the received light or signal. Reflective surface may comprise a metallic or dichroic mirror having a diameter in the range of 8 to 10 cm, for example, approximately 9 cm and a focal length in the range of 24 to 26 mm, for example, approximately 25 mm.
Reflective surface , however, may comprise any material and may have any shape suitable for receiving light through aperture and reflecting light to reflective surface Reflective surface receives light or an energy or optical signal from reflective surface and reflects the received light.
Reflective surface may comprise a metallic or dichroic mirror having a diameter in the range of 7 to 10 cm, for example, approximately 8 cm and a focal length in the range of 24 to 26 cm, for example, approximately 25 mm. Reflective surface , however, may comprise any material and may have any shape suitable for receiving light from reflective surface and reflecting light to a receptor area of sensor Receptor area  of sensor detects light reflected from reflective surface Sensor may include, for example, an infrared sensor or an image intensifier sensor.
Sensor , however, may comprise any suitable sensor, for example, a long wave infrared sensor, a medium wave infrared sensor, a short wave infrared sensor, a low light level charge coupled device LLLCCD , or a complementary metal-oxide semiconductor CMOS sensor. Sensor generates sensor data set S2 in response to the received light. Sensor may generate a different type of data set than that generated by sensor For example, sensor may include an infrared sensor that detects infrared energy of received light to generate a data set, and sensor may include an image intensifier sensor that enhances certain features of received light to generate a different type of data set.
Sensor data set S2 may include values assigned to pixels corresponding to points of light, where the values represent image information associated with the points of light.
Sensor transmits sensor data S2 to fusing module System  may have a central axis located approximately along a light path from object to receptor area of sensor Sensor and sensor may be substantially coaxial such that sensor and sensor receive light at a point approximately along central axis Sensor and sensor may be configured such that the diameter of inner assembly is less than the diameter of reflective surface , and inner assembly is approximately centered over reflective surface as illustrated in FIG.
In the illustrated embodiment, the configuration of sensors and allows sensors and to receive light from the same aperture with minimal reflective and refractive elements, providing for a compact imaging system.
Fusing module  receives sensor data S1 and S2 from sensors and , respectively. Fusing module fuses sensor data sets S1 and S2 to generate fused data. For example, fusing module combines values of sensor data sets S1 and S2 for pixels corresponding to the same point of light to generate the fused data.
Fusing module may use any suitable process for fusing data sets S1 and S2 for example, digital imaging processing, optical overlay, or analog video processing. In the illustrated embodiment, sensor  and sensor detect light received through the same aperture , so both sensors and receive light describing the same point of view of object As a result, fusing module does not need to perform data processing to reconcile different points of view.
Additionally, since minimal reflective and refractive elements are used, the light detected by sensors and undergoes few changes. As a result, fusing module does not need to perform processing to compensate for changes due to multiple reflective and refractive elements. Display  receives the fused data from fusing module , and generates an image of object using the fused data. Display may include any suitable system for displaying image data, such as an organic light-emitting diode OLED , nematic liquid-crystal display LCD , or field emitting display FED , in panel display, eyepiece display, or near-to-eye display formats.
Although the illustrated embodiment shows two sensors  and , the system of the present invention may include any suitable number of sensors, as described in connection with FIG. System includes an inner assembly coupled to an outer casing Inner assembly may be substantially similar to system of FIG. Outer assembly may be substantially similar to outer. That is, reflective surfaces and , which may be substantially similar to reflective surfaces and , respectively, are coupled to inner assembly and outer casing , respectively.
Additionally, sensor , which may be substantially similar to sensor , is coupled to outer casing Sensors , , and may be substantially coaxial. Fusing module is coupled to sensors , , and , and display is coupled to fusing module In operation, system  receives light reflected from object Inner assembly may generate data sets S1 and S2 in a manner substantially similar to that of system of FIG.
Sensor receives light reflected from reflective surfaces and in a substantially similar matter to that of sensor to generate dataset S3.
Fusing module receives datasets S1, S2 and S3 and fuses the datasets to generate fused data. Display receives the fused data and generates an image from the fused data. Additional sensors may be added to system The method begins at step , where light reflected from object is received by aperture The reflected light includes image information that may be used to form an image of object At step , sensor detects the received light. Optics may be used to focus the light onto sensor Sensor generates a data set S1 from the detected light and transmits data set S1 to fusing module at step Sensor may, for example, detect infrared light reflected from object and generate a data set S1 that describes the infrared light.
At step  , reflective surface receives light from object and reflects the received light to reflective surface
Image Intensified Cameras
A shell of soft iron is disposed surrounding the magnet of the appendage pump for shielding the image intensifier tube from the stray magnetic field of the appendage pump. A coating of magnetic material on the envelope of the intensifier tube, in the region facing the pump, provides additional magnetic shielding for shielding the interior of the tube from the stray magnetic field of the pump to further improve the resolution of the image intensifier tube. A clam shell shaped shield of soft iron was disposed surrounding the magnet of the appendage pump to shield the interior of the intensifier tube from the stray magnetic field produced by the magnet of the pump. However, it was found that the shell of soft iron surrounding the pump was inadequate to reduce the stray magnetic field within the interior of the intensifier tube to an acceptable level. In a typical example, the magnet of the appendage pump produces a magnetic field of gauss within the pump. With the soft iron shielding shell in place, the stray field within the intensifier tube is reduced to a level of approximately five gauss. However, five gauss is generally an unacceptable level.
Image intensifiers (IIs)
Young Drive E. Abstract We have begun developing an innovative ultra-fast single-photon counting imager which comprises a mega-pixel CMOS array and a newly-designed Image Intensifier. It is expected to have single photon sensitivity with psec time resolution, operational at a total counting rate exceeding 1MHz. Such a device has not been realized before and is expected to revolutionize time-resolved fluorescence imaging and spectroscopy from a single-molecule to whole animal level. In this paper, we present the design principle and preliminary results on its performance.
- RYUICHI SAKAMOTO SHEET MUSIC PDF
- BUET EEE SYLLABUS PDF
- EL CONQUISTADOR FEDERICO ANDAHAZI PDF
- JOSEPH LELYVELD GREAT SOUL PDF
- AMABLE Y TIRANO JOHANNA LINDSEY DESCARGAR PDF
- MALFORMACIONES PLACENTARIAS PDF
- CALENDARIO SCOLASTICO TOSCANA 2013-14 PDF
- DO BIEGU GOTOWI START SPSS PDF
- ALAN SOKAL FASHIONABLE NONSENSE PDF