A distributed balanced photodetector with high saturation photocurrent and excellent linearity has been experimentally demonstrated. The maximum linear direct current (dc) photocurrent of 33 mA per branch is equivalent to 66mA in single-ended photodetectors. A setup for investigating the alternating current (ac) linearity of the receiver is proposed and experimentally demonstrated. The receiver...

We present an overview of the properties of the NICMOS flight detectors as measured on-orbit, including the flat-field response, the dark current, the linearity, and the read-noise. We show for the first time all the dependencies of the various components of a NICMOS dark exposure, and show how to generate “synthetic” dark current calibration files. An unexpected time-varying bias known as the ...

2014 Present communication reports on photoconductivity measurements in thin films of Ga40SexTe60-x glasses (x = 20, 30, 40). Temperature dependence of steady state photocurrent and dark current show that dark and steady state photoconductivity are activated processes. Intensity dependence of photocurrent reveals about power law dependence of photocurrent on incident radiation. Also incorporate...

The effect of different 10 MeV equivalent proton fluences on the performance of E2V Technologies (formerly Marconi applied technologies, formerly EEV) L3Vision Charge Coupled Devices (CCDs) was investigated. The first experimental radiation damage results of the L3Vision device are presented, with emphasis given to the analysis of damage to the gain register of the device. Changes in dark curre...

Ground testing of WFC3 under ambient conditions during April of 2007 was performed in order to prepare for upcoming thermal vacuum testing. As a part of this ambient testing, the dark current rate of the spare UVIS package (UVIS build 2) was measured while the CCD was operating at a temperature of -54oC. This temperature is significantly higher than the nominal operating temperature of -83oC, l...

The Thermal Infrared Sensor (TIRS) requirements for noise, stability, and uniformity were designed to ensure the radiometric integrity of the data products. Since the launch of Landsat 8 in February 2013, many of these evaluations have been based on routine measurements of the onboard calibration sources, which include a variable-temperature blackbody and a deep space view port. The noise equiv...

Ongoing measurements of the dark current in the WFPC2 detectors indicate that the average level of dark current has been slowly increasing over the instrument's lifetime. We have analyzed more recent dark current data, now covering the period from September 1994 to January 2001. This analysis shows that after late-1998, the dark current is increasing more slowly than expected and could possibly...

In this paper the performance of an Al0.52In0.48P Ni radioisotope cell is reported over the temperature range -20 °C to 140 °C. A 400 μm diameter p-i-n (2 μm i-layer) Al0.52In0.48P mesa photodiode was used as conversion device in a novel betavoltaic cell. Dark current measurements on the Al0.52In0.48P detector showed that the saturation current increased increasing the temperature, while the id...

A bigravity theory where the normal and dark matter components are coupled to separate metric fields linked to each-other with small non-derivative terms allows the Yukawa-like modification of the gravitational potential at large distances. This opens new prospects for the dark matter candidates. Namely, instead of being cold and collisionless, dark matter can be collisional and dissipative, as...