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Accurate response spectrum is an important parameter of the photoelectric detectors, for it not only can be used to calculate quantum efficiency and detectivity, but also it is useful in application area especially in remote sensing. In this paper, in order to obtain accurate response spectrum at large spectral bandwidth (0.9–2.8μm) of the short-wavelength InGaAs measurement detector, benchmark transfer...
We describe a novel method to measure the relative spectral responsivity of Si and Ge photovoltaic detectors from 250 nm to 1700 nm based on a tunable nano-second pulsed optical parametric oscillator (OPO).
A flat spectral photon flux source is proposed to facilitate the single photon detector quantum efficiency calibration in an extended wavelength range (400–800nm). The absolute quantum efficiency at certain wavelengths (e.g. 633nm and 807nm) of the photon counter under test can be measured via correlated photons method and used to evaluate the photon statistics of the flat spectral photon flux source...
The Suomi National Polar-orbiting Partnership (SNPP) spacecraft's primary sensor is the Visible-Infrared Imaging Radiometer Suite (VIIRS) which launched on October 28, 2011. It has 22 total bands with 7 thermal emissive bands (TEBs), a high dynamic range monochromatic Day Night Band (DNB) and 14 reflective solar bands (RSBs). The TEB gain and noise performance is tracked on-orbit using an On-Board...
The reflective solar bands (RSB) of the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the Suomi National Polar-orbiting Partnership (SNPP) satellite are primarily calibrated on-orbit by a solar diffuser (SD) panel whose performance is monitored by an accompanying solar diffuser stability monitor (SDSM). In this paper, the SD and SDSM calibration methodology is reviewed and the results...
Since SWIR hyperspectral data provides useful information on minerals and soils, the applications to geology, mining and agriculture are expected. In the SWIR region, hyperspectral sensors use mercury cadmium telluride detectors that have more defects and show non-uniform responses to input radiances. Therefore, the pushbroom scanning of hyperspectral sensors causes stripe noises that disturb the...
The Visible-Infrared Imaging Radiometer Suite (VIIRS) on-board the Suomi National Polar-orbiting Partnership (SNPP) spacecraft as a primary sensor was launched October 28, 2011. It has 22 bands: 7 thermal emissive bands (TEBs), 14 reflective solar bands (RSBs) and a Day Night Band (DNB). The TEBs are calibrated on-orbit using the On-Board Calibrator BlackBody (OBCBB) as a thermal source every scan...
A primary sensor on-board the Suomi-National Polar-orbiting Partnership (SNPP) spacecraft, the Visible Infrared Imaging Radiometer Suite (VIIRS) has 22 bands: 14 reflective solar bands (RSBs), 7 thermal emissive bands (TEBs) and a Day Night Band (DNB). The RSBs cover the spectral wavelengths between 0.412 to 2.25 urn and have three (11-I3) 371m and eleven (M1-M11) 742m spatial resolution bands. Ocean...
In this paper we describe a new dataset, under construction, acquired inside the National Museum of Bargello in Florence. It was recorded with three IP cameras at a resolution of 1280 × 800 pixels and an average framerate of five frames per second. Sequences were recorded following two scenarios. The first scenario consists of visitors watching different artworks (individuals), while the second one...
Tubitak Uzay has started a spaceborne hyperspectral imager development project two years ago. As hyperspectral remote sensing is getting popular, Tubitak Uzay has R&D projects both on hardware development and software applications of hyperspectral imaging. Project is at the PDR level now. Many trade-off cases are evaluated during the system engineering and preliminary design phases. We are presenting...
This paper presents the design of a low-power, 9-bit, two-step time-to-digital converter (TDC) in 65 nm CMOS. Instead of using an array of time amplifiers (TAs) to amplify the time residue, the proposed TDC reduces the power and area consumptions by using only one TA. The designed TDC achieves a resolution of 1.2 ps with a conversion range of 0.614 ns while consuming 0.602 mW at 10 MHz and 8.299 mW...
IR radiometers are used for the measurement of IR intensity in military, industry, academic and research domains. For real-time, noncontact, accurate measurement with high sensitivity SR 5000 radiometer is employed. It covers the waveband from 0.4–14.5 µm and has a provision to accommodate many filters and detectors. The measurements are carried out with respect to internal black body, maintained...
The NTUHEP group is currently designing a BGO sytem to monitor the instant luminosity by measuring the back-to-back Bhabha events for BEAST2, a special detector for the commissioning of SuperKEKB and Belle2. The experiment of energy calibration will be introduced in the paper, the result shows BGO system can detect cosic ray and the maximun event number is occurred at 15 to 20 photon-electrons.
This paper presents GEMINI, an entire read-out System-on-Chip (SoC) to be used with the Triple Gas-Electron Multiplier (GEM) detector. Designed in CMOS 180 nm technology, GEMINI pushes towards the state-of-the-art for this peculiar detector front-end, as regards the count rate and detector pixel parasitic capacitance sustainability. It is composed of 16 channels, each performing a charge-to-voltage...
A load-line adjusted 2.4GHz PA is designed to operate in full power (18dBm/150mA) & mid power (7dBm/19mA) in OFDM with ∼130mA saving. To improve network throughput in dense environment with per-packet TX power control, the phase-compensated power detector achieves ±0.6dB accuracy for the entire 5GHz band over 2∶1 VSWR and 16dBm±0.25dB over channel flatness in VHT80MCS9. The chip area is 0.21mm...
Laser time transfer is and attractive technique to transfer time ground to space with picosecond precision and systematic errors on the level of tens of picoseconds. Recently the European Laser Timing experiment is under construction in the frame of the European Space Agency mission Atomic Clock Ensemble in Space. The objective of this laser time transfer is synchronization of the ground based clocks...
This paper analyzes the effectiveness of combining certain statistical techniques with a neural network to improve land mine detection. The detection method must not only detect the majority of landmines in the ground, it must also filter out as many of the false alarms as possible. This is the true challenge to developing landmine detection algorithms. Our approach combines a Back-Propagation Neural...
In this paper, an all-digitally controlled linear voltage regulator is proposed for ultra-low-power event-driven sensing platforms using a PMOS strength self-calibration technique. The voltage regulator generates the output voltage from 0.43V to 0.55V in steps of 30mV with a supply voltage of 0.6V. Against PVT and loading current variations, the PMOS strength self-calibration circuitry utilizes a...
The spectral performance parameters of hyper-spectral imaging spectrometer include the spectral calibration parameter and the radiometric calibrati on parameter. Accurate calibration of these parameters is the basic premise of the quantitative application of hyper-spectral data. The spectral calibration is used to determine the central wavelength, spectral width, and the radiometric calibration is...
A hodoscope based on pixel semiconductor detectors of the Timepix type (ATLAS-TPX) equipped with neutron converters and operating with common read-out was designed for remote measurements in mixed radiation field environments.
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