Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX

2010 ◽  
Vol 81 (10) ◽  
pp. 10D718 ◽  
Author(s):  
N. L. Schoenbeck ◽  
S. D. Ellington ◽  
R. J. Fonck ◽  
K. Jaehnig ◽  
G. R. McKee ◽  
...  
Keyword(s):  
High Speed ◽  
Low Noise ◽  
Optical Turbulence ◽  
Turbulence Fluctuation

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

scholarly journals Development of intelligent preamplifier for semiconductor detectors

2021 ◽  
pp. 8-8
Author(s):  
Vladimir Kondratjev ◽  
Vasily Litvinsky ◽  
Serhii Pohuliai ◽  
Stanislavs Lozkins
Keyword(s):  
Liquid Nitrogen ◽  
High Speed ◽  
Temperature Sensors ◽  
Low Noise ◽  
Nitrogen Level ◽  
Semiconductor Detectors ◽  
Resistive Feedback ◽  
Charge Sensitive Preamplifier ◽  
Gamma Detectors

The results of engineering an intelligent preamplifier for HPGe gamma-detectors are presented. An intelligent preamplifier is a low-noise, high-speed resistive feedback charge-sensitive preamplifier with a built-in microcontroller and additional units that enable control of preamplifier and detector parameters. It also allows to manage performance of the internal testing pulser, sensor of liquid nitrogen level in Dewar, humidity, pressure and temperature sensors in a sealed preamplifier section. Intelligent preamplifier operation, setup and parameter measurements are controlled by a software.

A Low-Noise Design Technique for High-Speed CMOS Optical Receivers

2014 ◽  
Vol 49 (6) ◽  
pp. 1437-1447 ◽  
Author(s):  
Dan Li ◽  
Gabriele Minoia ◽  
Matteo Repossi ◽  
Daniele Baldi ◽  
Enrico Temporiti ◽  
...  
Keyword(s):  
High Speed ◽  
Low Noise ◽  
Optical Receivers ◽  
Design Technique ◽  
Low Noise Design

High-speed and low-noise SACM avalanche photodiodes with an impact-ionization-engineered multiplication region

2005 ◽  
Vol 17 (8) ◽  
pp. 1719-1721 ◽  
Author(s):  
Ning Duan ◽  
Shuling Wang ◽  
Feng Ma ◽  
Ning Li ◽  
J.C. Campbell ◽  
...  
Keyword(s):  
High Speed ◽  
Impact Ionization ◽  
Avalanche Photodiodes ◽  
Low Noise

Acoustical behavior of loss-optimized involute gears

2021 ◽  
Vol 263 (5) ◽  
pp. 1574-1585
Author(s):  
Sebastian Sepp ◽  
Joshua Goetz ◽  
Karsten Stahl
Keyword(s):  
High Speed ◽  
Low Noise ◽  
Test Results ◽  
Motor Speed ◽  
Power Train ◽  
Higher Power ◽  
Involute Gears ◽  
Gear Geometry ◽  
Drive Systems ◽  
Design Calculations

The progressing electrification of vehicle drive systems focuses more and more on efficient high-speed concepts. Increasing the motor speed leads to a higher power density of the electrified power train and thereby to an increased range for battery electric vehicles. The high rotational speeds cause new challenges in designing gearboxes regarding the efficiency and the acoustical behavior. Most present gearings in conventional vehicles are designed with high tooth depths to ensure low noise excitation behavior combined with the best possible efficiency. By changing the gear geometry to smaller tooth depths with higher pressure angles, it is possible to further decrease gear losses. However, the loss-optimized gear geometry must not jeopardize the beneficial acoustical behavior. In theoretical studies, the acoustical behavior of loss-optimized gears are investigated and compared to gearings designed according to the state of the art. Design calculations of the excitations of all ideal gears without deviations are on similar levels. However, application of such gear geometries faces severe challenges because the sensitivity to manufacturing deviations may be high. In this paper, simulation results and test results between low-NVH gears and loss-optimized gears are documented and analyzed.

A Low-Noise Thermistor Bridge for Use in Calorimetry

1974 ◽  
Vol 20 (8) ◽  
pp. 1009-1012 ◽  
Author(s):  
Robert L Berger ◽  
Walter S Friauf ◽  
Horace E Cascio
Keyword(s):  
High Speed ◽  
Platinum Resistance Thermometer ◽  
Low Noise ◽  
Platinum Resistance ◽  
Resistance Thermometer ◽  
Thermistor Bridge ◽  
Flow Calorimeter ◽  
Titration Calorimeter ◽  
Lock In

Abstract A precision thermistor bridge and thermistor is described for use in a thermal titration calorimeter or a high-speed stopped- or continuous-flow calorimeter of the Roughton type. These are compared and evaluated with regard to several other types of detectors, including the platinum resistance thermometer, thermocouple, transistor thermometer, and capacitance thermometers. At this time the best detection for our purpose seems to be a specially constructed 20-100 kΩ thermistor used in conjunction with a new ac lock-in amplifier bridge. The sensitivity of the system is equivalent to a peak-to-peak noise of 25 x 10-6 °C, with a 100-ms time constant and 1 µW power dissipation in the thermistor. Long-term drift of the bridge, without an oven, was 1 x 10-6 °C/min.

A Linearity Improved 10-bit 120-MS/s 1.5 mW SAR ADC with High-Speed and Low-Noise Dynamic Comparator Technique

2019 ◽  
Vol 29 (06) ◽  
pp. 2050084
Author(s):  
Daiguo Xu ◽  
Hequan Jiang ◽  
Dongbin Fu ◽  
Xiaoquan Yu ◽  
Shiliu Xu ◽  
...  
Keyword(s):  
High Speed ◽  
Cmos Technology ◽  
Low Noise ◽  
Sar Adc ◽  
Dynamic Comparator ◽  
Analog To Digital ◽  
Input Noise ◽  
Clock Feedthrough ◽  
Threshold Voltages ◽  
Coupled Technique

This paper presents a linearity improved 10-bit 120-MS/s successive approximation register (SAR) analog-to-digital converter (ADC) with high-speed and low-noise dynamic comparator. A gate cross-coupled technique is introduced in boost sampling switch, the clock feedthrough effect is compensated without extra auxiliary switch and the linearity of sampling switch is enhanced. Further, substrate voltage boost technique is proposed, the absolute values of threshold voltage and equivalent impedances of MOSFETs are both depressed. Consequently, the delay of comparator is also reduced. Moreover, the reduction of threshold voltages for input MOSFETs could bring higher transconductance and lower equivalent input noise. To demonstrate the proposed techniques, a design of SAR ADC is fabricated in 65-nm CMOS technology, consuming 1.5[Formula: see text]mW from 1[Formula: see text]V power supply with a SNDR [Formula: see text][Formula: see text]dB and SFDR [Formula: see text][Formula: see text]dB. The proposed ADC core occupies an active area of 0.021[Formula: see text]mm2, and the corresponding FoM is 24.4 fJ/conversion-step with Nyquist frequency.

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