公开(公告)号：NO911422L

公开(公告)日：1991-10-14

申请号：NO911422

申请日：1991-04-11

Applicant: HUGHES AIRCRAFT CO

Inventor： DRUMMOND JAMES E ,  SHIH I-FU

IPC: G01J3/12 ,  G01J3/02 ,  G01J3/18 ,  G01J3/28

Abstract: This invention relates to a dispersive holographic spectrometer (12) for analyzing radiation from an infrared source (16). The holographic spectrometer (12) comprises a piezoelectric block (40) having a holographic lens (38) on one face, an array of detectors (36) on another face and a pair of vernier electrodes (32, 34) on opposite faces. Radiation from the source (16) incident upon the holographic lens (38) is dispersed into component wavelengths (44, 46) and directed towards the detector array (36). The holographic lens (38) has a holographic interference pattern recorded on it such that radiation of predetermined wavelength components are dispersed sufficiently enough such that radiation of specific wavelengths falls on different detector elements (48) of the detector array (36). By applying a voltage to the electrodes (32, 38), an electric field is created within the piezoelectric block (40) such that it is either compressed or expanded. This change in the piezoelectric block (40) alters the direction of the radiation from the holographic lens (38) to the detector array (36). Therefore, misalignment of the source (16) with the holographic lens (38) can be compensated for such that piezoelectric adjustment of the block (40) will make the radiation of individual wavelengths fall on the desired detector element (48). Further, radiation from different wavelengths can be directed from one detector element to another. The detector array (36) is self-scanning such that an absorption spectrum can be measured and recorded over a range of frequencies.

公开(公告)号：NO911422A

公开(公告)日：1991-10-14

申请号：NO911422

申请日：1991-04-11

Applicant: HUGHES AIRCRAFT CO

Inventor： DRUMMOND JAMES E ,  SHIH I-FU

IPC: G01J3/12 ,  G01J3/02 ,  G01J3/18 ,  G01J3/28

CPC classification number: G01J3/1838 ,  G01J3/0237 ,  G01J3/0256 ,  G01J3/0259 ,  G01J3/0286 ,  G01J3/0289 ,  G01J3/2803 ,  G01N21/3504 ,  G01N2201/067

Abstract: This invention relates to a dispersive holographic spectrometer (12) for analyzing radiation from an infrared source (16). The holographic spectrometer (12) comprises a piezoelectric block (40) having a holographic lens (38) on one face, an array of detectors (36) on another face and a pair of vernier electrodes (32, 34) on opposite faces. Radiation from the source (16) incident upon the holographic lens (38) is dispersed into component wavelengths (44, 46) and directed towards the detector array (36). The holographic lens (38) has a holographic interference pattern recorded on it such that radiation of predetermined wavelength components are dispersed sufficiently enough such that radiation of specific wavelengths falls on different detector elements (48) of the detector array (36). By applying a voltage to the electrodes (32, 38), an electric field is created within the piezoelectric block (40) such that it is either compressed or expanded. This change in the piezoelectric block (40) alters the direction of the radiation from the holographic lens (38) to the detector array (36). Therefore, misalignment of the source (16) with the holographic lens (38) can be compensated for such that piezoelectric adjustment of the block (40) will make the radiation of individual wavelengths fall on the desired detector element (48). Further, radiation from different wavelengths can be directed from one detector element to another. The detector array (36) is self-scanning such that an absorption spectrum can be measured and recorded over a range of frequencies.

公开(公告)号：FI911785A

公开(公告)日：1991-10-14

申请号：FI911785

申请日：1991-04-12

Applicant: HUGHES AIRCRAFT CO

Inventor： DRUMMOND JAMES E ,  SHIH I-FU

IPC: G01J3/12 ,  G01J3/02 ,  G01J3/18 ,  G01J3/28 ,  G01J

Abstract: This invention relates to a dispersive holographic spectrometer (12) for analyzing radiation from an infrared source (16). The holographic spectrometer (12) comprises a piezoelectric block (40) having a holographic lens (38) on one face, an array of detectors (36) on another face and a pair of vernier electrodes (32, 34) on opposite faces. Radiation from the source (16) incident upon the holographic lens (38) is dispersed into component wavelengths (44, 46) and directed towards the detector array (36). The holographic lens (38) has a holographic interference pattern recorded on it such that radiation of predetermined wavelength components are dispersed sufficiently enough such that radiation of specific wavelengths falls on different detector elements (48) of the detector array (36). By applying a voltage to the electrodes (32, 38), an electric field is created within the piezoelectric block (40) such that it is either compressed or expanded. This change in the piezoelectric block (40) alters the direction of the radiation from the holographic lens (38) to the detector array (36). Therefore, misalignment of the source (16) with the holographic lens (38) can be compensated for such that piezoelectric adjustment of the block (40) will make the radiation of individual wavelengths fall on the desired detector element (48). Further, radiation from different wavelengths can be directed from one detector element to another. The detector array (36) is self-scanning such that an absorption spectrum can be measured and recorded over a range of frequencies.

公开(公告)号：ES2006049A6

公开(公告)日：1989-04-01

申请号：ES8800093

申请日：1988-01-15

Applicant: HUGHES AIRCRAFT CO

Inventor： CHANG DAVID B ,  BERG MICHAEL F ,  DRUMMOND JAMES E ,  MICKELSON LEE

IPC: G01N25/72

Abstract: SE TRATA DE UN SISTEMA PARA INSPECCIONAR LA INTEGRIDAD ELECTRONICA DE LAS JUNTAS O UNIONES DE SOLDADURA MEDIANTE CALENTAMIENTO REPETITIVO (POR IMPULSOS) DE LAS JUNTAS DE SOLDADURA CON ENERGIA RADIANTE Y DETERMINANDO LA OSCILACION DE TEMPERATURA DE LAS JUNTAS DE SOLDADURA ASI CALENTADAS POR IMPULSOS, MIDIENDO PARA ELLO LAS EMISIONES DE RAYOS INFRARROJOS PROCEDENTES DE LAS JUNTAS DE SOLDADURA DURANTE LOS PERIODOS DE CALENTAMIENTO Y DE AUSENCIA DE CALENTAMIENTO. PARA MAYOR VENTAJA, LAS JUNTAS DE SOLDADURA EXPUESTAS DE UNA PLACA DE CIRCUITOS PUEDEN SER PROBADAS O ENSAYADAS TODAS DE UNA VEZ, CALENTANDO POR IMPULSOS LA PLACA ENTERA DE CIRCUITOS. LA OSCILACION DE TEMPERATURA DE CADA JUNTA PUEDE SER COMPARADA CON LAS OSCILACIONES DE TEMPERATURA DE UNAS JUNTAS DE SOLDADURA STANDAR CORRESPONDIENTES, DE BUENA INTEGRIDED ELECTRONICA CONOCIDA, EN PLACAS DE CIRCUITOS QUE FUNCIONAN ADECUADAMENTE.