scholarly journals 401 MHz transistorised radiosonde transmitter

MAUSAM ◽  
2021 ◽  
Vol 43 (1) ◽  
pp. 87-90
Author(s):  
S. K. SRIVASTAVA ◽  
S. K. BINDRA ◽  
M. P. BHARDWAJ

This paper describes a transistorised radiosonde transmitter which was designed to replace valve version earlier used in national upper air l1etwork for upper air data acquisition. The transmitter operates in 400.6-406 MHz frequency band (tunable) with 500 mill watt power output utilising a 22.5V water activated battery, Stripling technique has been deployed to obtain the optimum. design and transmitted meets all the stringent requirements laid down for accurate data conversion and transmission. The system IS In routine use In the national upper air network and the performance is satisfactory.  

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Rebecca Ort ◽  
Philipp Metzler ◽  
Astrid L. Kruse ◽  
Felix Matthews ◽  
Wolfgang Zemann ◽  
...  

Ample data exists about the high precision of three-dimensional (3D) scanning devices and their data acquisition of the facial surface. However, a question remains regarding which facial landmarks are reliable if identified in 3D images taken under clinical circumstances. Sources of error to be addressed could be technical, user dependent, or patient respectively anatomy related. Based on clinical 3D photos taken with the 3dMDface system, the intra observer repeatability of 27 facial landmarks in six cleft lip (CL) infants and one non-CL infant was evaluated based on a total of over 1,100 measurements. Data acquisition was sometimes challenging but successful in all patients. The mean error was 0.86 mm, with a range of 0.39 mm (Exocanthion) to 2.21 mm (soft gonion). Typically, landmarks provided a small mean error but still showed quite a high variance in measurements, for example, exocanthion from 0.04 mm to 0.93 mm. Vice versa, relatively imprecise landmarks still provide accurate data regarding specific spatial planes. One must be aware of the fact that the degree of precision is dependent on landmarks and spatial planes in question. In clinical investigations, the degree of reliability for landmarks evaluated should be taken into account. Additional reliability can be achieved via multiple measuring.


2011 ◽  
Vol 467-469 ◽  
pp. 818-822
Author(s):  
Dong Yu Zhang

This paper introduces the touch screen driver design based on Linux plays an important role in applications of touch screen. In order to further explore embedded touch screen driver design, and then optimize and improve existing drivers at practice level, this paper accomplished the design of touch screen driver using SPI interface and ADS7843 touch screen chip controller based on Samsung S3C2410s microprocessor. We designed the touch screen hardware interrupt program using the bottom half mechanism of the kernel timer, utilized 16 clock cycles of coordinate conversion sequences to achieve touch point based data acquisition and present the process of coordinate collection. The touch screen driver ran well on the UP-NETARM2410-S platform. The hardware design was verified to be simple and reliable while the corresponding software accomplished touch state detection and touch data conversion efficiently. The touch screen control method is simple, efficient and easy to realize.


2014 ◽  
Vol 607 ◽  
pp. 673-676 ◽  
Author(s):  
Chen Ding ◽  
Ya Wen Dai ◽  
Peng Li ◽  
Yang Sun ◽  
Wei Zheng Wang ◽  
...  

Dynamic strain acquisition technology is becoming increasingly important in industrial production. Compared with the static strain acquisition technology,the dynamic stain acquisition technology provided a much wider range of frequencies from 0~100KHz which required a much more accurate data acquisition system. This paper proposed an accurate data acquisition system which included electric bridge、constant current source、signal amplifier and anti-aliasing filter. This system has largely suppressed noise and increased the performance of the dynamic strain acquisition.


2014 ◽  
Vol 602-605 ◽  
pp. 3056-3059
Author(s):  
Li Ge Yu

This paper introduces a kind of spectral data acquisition system based on the linear CCD. The spectral acquisition circuit, data conversion and storage circuit were designed. The synchronization of the spectral data acquisition, data conversion and storage were achieved using VHDL. Finally, the spectrum contained noise is processed by the wavelet denoising theory. The experimental results show that the proposed scheme is feasible.


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