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PTB applied a novel thin-film pyroelectric detector in an international pilot comparison on THz power measurement below 1 THz. Due to its spectrally flat response, this detector is suitable for accurate absolute TDS power measurements and as reference material for TDS transmission and reflection measurements as well.
This article explains the design, assembly and calibration of a basic Geiger-M uller dose rate meter. The detector was elaborated using a Texas Instruments MSP430 low-power microcontroller, auxiliary analog front-end and high voltage electronics, as well as a commercial Geiger-M¨ uller tube as the detector, which was calibrated to measure the ambient dose rate equivalent. The main objective of this...
Interface pressures are closely related to the comfort and fit of a lower-limb prosthetic socket and clinicians and researchers are interested in monitoring these loads. In particular, shear stresses at the socket/liner interface are indicative of important fit characteristics but are difficult to measure in situ. We have developed an elastomeric liner with sixteen integrated pressure and shear sensors,...
In this paper, a CMOS monolithic calibrated position-sensitive detector (PSD) for detecting light-spot position applications is newly proposed. A calibration technique is proposed in this work. With the calibration circuits, the proposed chip successfully detects the position of a small light in a real environment. Before performing the proposed calibration circuits, the maximum linear error is 54...
This paper presents the in-flight charge-coupled device (CCD) dark characterization of the Suomi National Polar-orbiting Partnership (S-NPP) Ozone Mapping Profiler Suite (OMPS). Data from OMPS's three different CCD detector arrays have been collected to characterize in-flight detector behaviors. It is of our primary interest in the evolution and trend of the dark current as well as the signal distribution...
Since launch, Terra and Aqua MODIS have produced an unprecedentedly large amount of high quality data products and supported a broad range of applications by the remote sensing science community and users worldwide. Constant and dedicated efforts have been made to continue instrument normal operation, to monitor and characterize changes in sensor responses, and to update calibration parameters to...
We present an improved method for measuring power at ∼100 GHz and above using a large-area (5-mm diam) LiTaO3 pyroelectric detector. The pyroelectric element is packaged in a lid-free TO-5 can, which in turn is mated to one end of a 1/2-inch-diam brass tube whose opposite end is flared for improved coupling efficiency. This “light-pipe”-like arrangement is cross-calibrated against a thermistor-based...
This paper introduces a phase shift detector (PSD) with high accuracy for sensing applications. The proposed design comprises a Narrow bandpass filter, a Comparator, and an Offset calibration circuit. Narrow bandpass filter rejects all the signals except that generated from a Fixed-frequency Generator. To reduce the error caused by circuit noise and external interface, Offset calibration circuit (OCC)...
A compact acquisition system developed for a flexible large area monoport tactile surface is presented. This sensor requires a single port connection and avoids complicated matrix acquisition system. The tactile surface is a coplanar transmission line printed on a flexible large area. Touching the waveguide generates a reflected signal analyzed to locate the touch event. Theoretical background, design...
This paper describes a new method for high accuracy determination of instantaneous frequency and linearity of frequency modulated continuous wave systems. The presented setup reduces the frequency measurement to a phase measurement based on Six-Port interferometer with a delay line. To extend the range of possible input frequencies and power levels, a calibration method and the appropriate correction...
The MASPEX instrument is a high-resolution, high-sensitivity time-of-flight mass spectrometer developed for planetary applications. Its high-resolution (25,000 mMm at 10% peak height) allows the unambiguous determination of volatile isotopes of methane, water, ammonia, carbon monoxide, molecular nitrogen, carbon dioxide, and low order (C2, C3, and C4) organic compounds in complex mixtures. The use...
Many camera calibration techniques require the detection of a pattern with known geometry, e.g., a checkerboard. Typically, the pattern must be fully contained in the field of view. This brings several limitations, one of which is that lens distortion can not reliably be estimated in outer image regions. This paper presents the occluded checkerboard pattern detector (OCPAD) to find checkerboards,...
Phase-locked loops (PLLs) are widely used in various applications such as processors, consumer electronics, and wireline communication systems. When digital circuits and a PLL with a ring oscillator are integrated together, the power supply noise may degrade the jitter performance of the PLL. To lower the supply-noise sensitivity of a PLL, several approaches [1-5] have been proposed. A passive decoupling...
Recently, steganalysis based on hypothesis test theory becomes a focus. However, the correlation between adjacent pixels is not exploited and this is obviously not reasonable. In this paper, a new detector for least significant bit matching (LSBM) steganography is proposed with the consideration of pixel correlation. The cover pixels are modeled by multivariate Gaussian distribution and a new detector...
In common satellite image preprocessing, quality of radiometric and geometric correction play important roles in producing a high quality image. Both radiometric and geometric correction needs accurate calibrated camera parameters. This paper presents the analysis of radiometric calibration that has been done on matrix imager of LAPAN-A3 satellite payload. In this research, radiometric process of...
Cylindrical electret ion-chambers were used for detection and dosimetry of beta radiation and showed a linear decrease of electret charge with absorbed dose for different field geometries and wall materials. A beta secondary standard system was used with four beta sources (90Sr−90Y, 204TL, 147Pm and 85Kr). Doses from 10−6 Gy to 10−1Gy can be measured with the system.
Today more and more multifunction RF-SIP (System-In-Package) modules, in SMD (Surface-Mount-Technology) package style, come into high volume production phase. There are many challenges in automatic RF measurements of RF-SIP-SMD devices. Each different SIP must have dedicated load-board that contains multiple RF connectors as well as a rigorous RF considerations and design. Furthermore, RF test equipment...
GEMINI is a readout ASIC dedicated to the Triple-GEM detector. Fabricated 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 features 16 channels, each one including a charge-sensitive preamplifier, an event discriminator with channel-independent threshold...
Tracking radioactive sources in 3D can impact homeland security, airport/port surveillance and the military. Unfortunately, the radiological sensors with the highest SNR and the lowest price are unidirectional - i.e. They integrate radiation from a sphere of directions centered at the sensor. We combine such devices with commercially available depth sensors to break this directional ambiguity. We...
A hybrid pixel detector working in the single photon counting mode was designed for the High Energy Photon Source (HEPS) in China. Aiming for diffraction and protein crystallography applications, the pixel readout chip works in single photon counting mode in each pixel. It contains an array of 104 × 72 pixels with a pixel size of 150μm×150 μm, each owning a counting depth of 20bits. Different from...
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