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Unremarkable on the Face of It

Description: This paper was part of a series by the Smithsonian Photography Initiative 'Click! Photography Changes Everything'. This paper discusses family photographs and how sometimes seemingly unremarkable snapshots can be truly remarkable.
Date: December 3, 2009
Creator: O'Connor, Brian Clark
Partner: UNT College of Information

A High Speed Rotating Mirror Frame Camera

Description: The following report describes a high speed framing camera that was developed at the Los Alamos Scientific Laboratory. It contains a rotating mirror and 170 framing lenses working at f/26 to produce frame pictures 1.2 x 1.4 centimeters in size.
Date: 1952
Creator: Brixner, Berlyn
Partner: UNT Libraries Government Documents Department

EXIF and Electric Boat

Description: This photograph shows a Nikon camera on a tripod in the middle of a an electric boat. The electric boat is sitting on the edge of the water. Over the image, photographic information is listed in white font.
Date: unknown
Creator: O'Connor, Brian Clark
Partner: UNT College of Information

The NACA high-speed motion-picture camera optical compensation at 40,000 photographs per second

Description: The principle of operation of the NACA high-speed camera is completely explained. This camera, operating at the rate of 40,000 photographs per second, took the photographs presented in numerous NACA reports concerning combustion, preignition, and knock in the spark-ignition engine. Many design details are presented and discussed, details of an entirely conventional nature are omitted. The inherent aberrations of the camera are discussed and partly evaluated. The focal-plane-shutter effect of the camera is explained. Photographs of the camera are presented. Some high-speed motion pictures of familiar objects -- photoflash bulb, firecrackers, camera shutter -- are reproduced as an illustration of the quality of the photographs taken by the camera.
Date: November 6, 1945
Creator: Miller, Cearcy D.
Partner: UNT Libraries Government Documents Department

Vaporization rates and drag coefficients for isooctane sprays in turbulent air streams

Description: Report presenting the use of a droplet camera developed at the NACA Lewis laboratory to obtain drop-size distribution and drop-velocity data for isooctane injected from a simple orifice directly into a turbulent air stream. Vaporization and drag coefficients were calculated for isooctane drops accelerating and evaporating in streams with velocities of 140 and 180 feet per second. Results regarding the vaporization-rate equations, drop-size-distribution analyses, analysis of drop-velocity data, and fuel-spray-evaporation calculations are provided.
Date: October 1954
Creator: Ingebo, Robert D.
Partner: UNT Libraries Government Documents Department

FPS-vidicon television camras for ultrafast-scan data acquisition

Description: Two ultrafast-scan (<8 ms/field) television (TV) camera prototypes have been developed for closed-circuit data-acquisition applications. The line and field rates are quasi-continuously adjustable. The number of lines, the integration duty cycle, and the scan direction are among the other adjustable parameters. Typical resolution at the fastest scan rate is >500 TV lines per picture height with a corresponding dynamic range (to light input) of more than 100. The cameras use the unique properties of FPS vidicons and specially designed electronics to achieve their performance levels and versatility. The advantages and disadvantages of FPS vidicons and of antimony trisulfide and silicon target materials in such applications are discussed in detail. All of the electronics circuits are discussed. The sweep generator designs are treated at length because they are the key to the cameras' versatility. Emphasis is placed on remotely controllable analog and digital sweep generators. The latter is a complete CAMAC-compatible subsystem containing a 16-function master arithmetic logic unit. Pulsed and cw methods of obtaining transfer characteristics are described and compared. The effects of generation rates, tube types, and target types on the resolution, determined from contrast-transfer-function curves, are discussed. Several applications are described, including neutron TV pinhole, TREAT, and barium-release experiments.
Date: June 1, 1980
Creator: Noel, B.W. & Yates, G.J.
Partner: UNT Libraries Government Documents Department

Sensor Development for the Large Synoptic Survey Telescope.

Description: The Large Synoptic Survey project proposes to build an 8m-class ground-based telescope with a dedicated wide field camera. The camera consists of a large focal plane mosaic composed of multi-output CCDs with extended red response. Design considerations and preliminary characterization results for the sensors are presented in this contribution to the Workshop.
Date: June 7, 2007
Creator: O'Connor,P.; Radeka, V. & Takacs, P.
Partner: UNT Libraries Government Documents Department

The rest-frame K-band luminosity function of galaxies in clusters to z = 1.3

Description: We derive the rest-frame K-band luminosity function for galaxies in 32 clusters at 0.6 &lt; z &lt; 1.3 using deep 3.6 {micro}m and 4.5 {micro}m imaging from the Spitzer Space Telescope InfraRed Array Camera (IRAC). The luminosity functions approximate the stellar mass function of the cluster galaxies. Their dependence on redshift indicates that massive cluster galaxies (to the characteristic luminosity M*{sub K}) are fully assembled at least at z {approx} 1.3 and that little significant accretion takes place at later times. The existence of massive, highly evolved galaxies at these epochs is likely to represent a significant challenge to theories of hierarchical structure formation where such objects are formed by the late accretion of spheroidal systems at z &lt; 1.
Date: March 20, 2007
Creator: De Propris, R; Stanford, S A; Eisenhardt, P R; Holden, B P & Rosati, P
Partner: UNT Libraries Government Documents Department

The optical system of the NACA 400,000-frame-per-second motion-picture camera

Description: Report presenting the optical principle of the NACA ultrahigh-speed camera. Simplified sketches are included illustrating the optical principle and main design features of the camera, but without minor design details. A detailed description of the camera is provided as well as some sample photographs taken with the camera.
Date: August 1947
Creator: Miller, Cearcy D.
Partner: UNT Libraries Government Documents Department

A study by high-speed photography of combustion and knock in a spark-ignition engine

Description: "The study of combustion in a spark-ignition engine given in Technical Report no. 704 has been continued. The investigation was made with the NACA high-speed motion-picture camera and the NACA optical engine indicator. The camera operates at the rate of 40,000 photographs a second and makes possible the study of phenomena occurring in time intervals as short as 0.000025 second. Photographs are presented of combustion without knock and with both light and heavy knocks, the end zone of combustion being within the field of view" (p. 15).
Date: December 9, 1941
Creator: Miller, Cearcy D.
Partner: UNT Libraries Government Documents Department

New approach to jitter reduction of an x-ray streak camera in accumulation mode.

Description: An x-ray streak camera operating in accumulation mode was developed for studying ultrafast dynamics at synchrotron facilities. A laser-triggered photoconductive switch was used as a sweeping unit to obtain low timing jitter. The fast rise time of the ramp pulse generated by the switch (90 ps) combined with the fast response of the traveling wave deflection plates (150 ps) significantly reduced the jitter caused by the shot-to-shot laser fluctuation. At {approx}1% rms (root mean square) laser energy fluctuation, the resolution of the camera is 1.1 ps when over 5000 laser shots were accumulated. This is two times better than that of the previous design with slower response (300 ps) deflection plates.
Date: July 19, 2002
Creator: Liu, J.; MacPhee, A. G.; Liu, C.; Shan, B.; Wang, J. & Chang, Z.
Partner: UNT Libraries Government Documents Department


Description: A prototype liquid xenon {gamma}-camera has been constructed and preliminary results obtained. The sensitive volume is 7 c x 7 cm in area and 1.5 cm thick. Orthogonal coordinates for each interacting {gamma}-ray are provided by 24 anode wires 5 {micro} in diameter spaced 2.8 mm apart and 24 cathode strips.
Date: December 1, 1972
Creator: Zaklad, Haim; Derenzo, Stephen E.; Muller, Richard A. & Smits,Robert G.
Partner: UNT Libraries Government Documents Department

A New Determination of the High Redshift Type Ia Supernova Rateswith the Hubble Space Telescope Advanced Camera for Surveys

Description: We present a new measurement of the volumetric rate of Type Ia supernova up to a redshift of 1.7, using the Hubble Space Telescope (HST) GOODS data combined with an additional HST dataset covering the North GOODS field collected in 2004. We employ a novel technique that does not require spectroscopic data for identifying Type Ia supernovae (although spectroscopic measurements of redshifts are used for over half the sample); instead we employ a Bayesian approach using only photometric data to calculate the probability that an object is a Type Ia supernova. This Bayesian technique can easily be modified to incorporate improved priors on supernova properties, and it is well-suited for future high-statistics supernovae searches in which spectroscopic follow up of all candidates will be impractical. Here, the method is validated on both ground- and space-based supernova data having some spectroscopic follow up. We combine our volumetric rate measurements with low redshift supernova data, and fit to a number of possible models for the evolution of the Type Ia supernova rate as a function of redshift. The data do not distinguish between a flat rate at redshift &gt; 0.5 and a previously proposed model, in which the Type Ia rate peaks at redshift {approx} 1 due to a significant delay from star-formation to the supernova explosion. Except for the highest redshifts, where the signal to noise ratio is generally too low to apply this technique, this approach yields smaller or comparable uncertainties than previous work.
Date: October 1, 2007
Creator: Kuznetsova, N.; Barbary, K.; Connolly, B.; Kim, A.G.; Pain, R.; Roe, N.A. et al.
Partner: UNT Libraries Government Documents Department

Tower Camera Handbook

Description: The tower camera in Barrow provides hourly images of ground surrounding the tower. These images may be used to determine fractional snow cover as winter arrives, for comparison with the albedo that can be calculated from downward-looking radiometers, as well as some indication of present weather. Similarly, during spring time, the camera images show the changes in the ground albedo as the snow melts. The tower images are saved in hourly intervals. In addition, two other cameras, the skydeck camera in Barrow and the piling camera in Atqasuk, show the current conditions at those sites.
Date: January 1, 2005
Creator: Moudry, D
Partner: UNT Libraries Government Documents Department