High-precision detector-switched monolithic GaAs time-delay network for the optical control of phased arrays

1994 ◽  
Vol 6 (2) ◽  
pp. 231-234 ◽  
Author(s):  
W. Ng ◽  
D. Yap ◽  
A. Narayanan ◽  
A. Walston
Keyword(s):  
Time Delay ◽  
High Precision ◽  
Phased Arrays ◽  
Optical Control

scholarly journals Monitoring water content changes in a soil profile with TDR-probes at just three depths - How well does it work?

RBRH ◽  
2020 ◽  
Vol 25 ◽  
Author(s):  
Jens Hagenau ◽  
Vander Kaufmann ◽  
Heinz Borg
Keyword(s):  
Time Delay ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
High Precision ◽  
Soil Profile ◽  
Reliable Data ◽  
Short Term ◽  
True Values ◽  
Daily Changes

ABSTRACT TDR-probes are widely used to monitor water content changes in a soil profile (ΔW). Frequently, probes are placed at just three depths. This raises the question how well such a setup can trace the true ΔW. To answer it we used a 2 m deep high precision weighing lysimeter in which TDR-probes are installed horizontally at 20, 60 and 120 cm depth (one per depth). ΔW-data collected by weighing the lysimeter vessel were taken as the true values to which ΔW-data determined with the TDR-probes were compared. We obtained the following results: There is a time delay in the response of the TDR-probes to precipitation, evaporation, transpiration or drainage, because a wetting or drying front must first reach them. Also, the TDR-data are more or less point measurements which are then extrapolated to a larger soil volume. This frequently leads to errors. For these reasons TDR-probes at just three depths cannot provide reliable data on short term (e.g. daily) changes in soil water content due to the above processes. For longer periods (e.g. a week) the data are better, but still not accurate enough for serious scientific studies.

High-Precision Time Delay Control with Continuous Phase Shifter for Pump-Probe Experiments Using Synchrotron Radiation Pulses

2010 ◽  
Author(s):  
Yoshihito Tanaka ◽  
Takashi Ohshima ◽  
Yoshimitsu Fukuyama ◽  
Nobuhiro Yasuda ◽  
Jungeun Kim ◽  
...  
Keyword(s):  
Time Delay ◽  
Synchrotron Radiation ◽  
High Precision ◽  
Phase Shifter ◽  
Continuous Phase ◽  
Pump Probe ◽  
Time Delay Control ◽  
Delay Control ◽  
Precision Time

Ultra-high-precision time control system over any long time delay for laser pump and synchrotron x-ray probe experiment

2008 ◽  
Vol 79 (4) ◽  
pp. 045107 ◽  
Author(s):  
Yoshimitsu Fukuyama ◽  
Nobuhiro Yasuda ◽  
Jungeun Kim ◽  
Haruno Murayama ◽  
Takashi Ohshima ◽  
...  
Keyword(s):  
Control System ◽  
Time Delay ◽  
High Precision ◽  
X Ray ◽  
Laser Pump ◽  
Time Control ◽  
Probe Experiment ◽  
Long Time ◽  
Precision Time

Review of Ejection Seat Electronic Program Controller

2014 ◽  
Vol 551 ◽  
pp. 530-534
Author(s):  
Yu Fei Wang ◽  
Li Lin Han ◽  
Feng Wang
Keyword(s):  
Time Delay ◽  
High Precision ◽  
Small Volume ◽  
Light Weight ◽  
Separation System ◽  
Development Potential ◽  
Life Saving ◽  
Main Component ◽  
Program Controller

Ejector seat program controller is the key device unfolded by the separation of the control people-seat and lifesaving parachute after the seat ejection from the machine, which is the main component of seat separation system. Compared with the mechanical program controller, electronic program controller has many advantages: small volume, light weight, time delay of high precision, good flexibility, strong power, easy to expand, the tremendous development potential and splendid testability. This paper respectively introduces the English MK series seats, American ACES series seat and Russian K-36Дseries seat electronic program controller, focusing on the TWZI type electronic program controller developed by China Aviation Life-saving Institute

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