The Weak Light Signal Acquisition Detection Technology Based on Multi-Touch Application Research

2014 ◽  
Vol 687-691 ◽  
pp. 572-575
Author(s):  
An Bi Qin ◽  
Cheng Yong Li
Keyword(s):  
Humidity Sensor ◽  
Light Signal ◽  
Signal Acquisition ◽  
Test Results ◽  
Application Research ◽  
Lighting Control ◽  
Detection Technology ◽  
Detection Circuit ◽  
Weak Light ◽  
Sensor Detection

The system test results show that the system modules can run normally. When light detection circuit, pyroelectric infrared sensor detects information, microcontroller will drive the relay open the light, or shut down. In the window, the motor can work normally, can automatically control the curtain, in the ZigBee information transmission, can to control the power supply and remind. DT11 indoor temperature and humidity sensor detection, can work normally. Through repeated tests, HOLTEK microcontroller based ZigBee smart classroom lighting control system is developed.

scholarly journals Investigation on a Novel Capacitive Electrode for Geophysical Surveys

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Zhiyu Wang ◽  
Shun Wang ◽  
Guangyou Fang ◽  
Qunying Zhang
Keyword(s):  
Electrical Contact ◽  
Capacitive Coupling ◽  
Environmental Damage ◽  
Good Prospect ◽  
Test Results ◽  
Geophysical Surveys ◽  
Detection Circuit ◽  
Operating Bandwidth ◽  
Capacitive Electrode ◽  
Alternative Structure

Nonpolarizable electrodes are applied widely in the electric field measurement for geophysical surveys. However, there are two major problems: (1) systematic errors caused by poor electrical contact in the high resistive terrains and (2) environmental damage associated with using nonpolarizable electrodes. A new alternative structure of capacitive electrode, which is capable of sensing surface potential through weak capacitive coupling, is presented to solve the above problems. A technique is introduced to neutralize distributed capacitance and input capacitance of the detection circuit. With the capacitance neutralization technique, the transmission coefficient of capacitive electrode remains stable when environmental conditions change. The simulation and field test results indicate that the new capacitive electrode has an operating bandwidth range from 0.1 Hz to 1 kHz. The capacitive electrodes have a good prospect of the applications in geophysical prospecting, especially in resistive terrains.

Application Research of Wireless Communication Technology in Remote Meter Reading System

2014 ◽  
Vol 513-517 ◽  
pp. 1494-1498 ◽  
Author(s):  
Zhang Hong ◽  
Jun Jie Wang ◽  
Ai Sheng Ma
Keyword(s):  
Circuit Design ◽  
Test Results ◽  
Application Research ◽  
Remote Transmission ◽  
Zigbee Technology ◽  
Design Requirements ◽  
Terminal Design ◽  
Reading System ◽  
Hardware Circuit ◽  
Data Terminal

In view of the problems in the current domestic and international remote wireless meter reading system, propose the remote wireless meter reading terminal system based on ZigBee technology combined with GPRS technology, carry out the hardware circuit design of each module, establish ZigBee wireless meter reading network based on 802.15.4 layer networking protocol, design a more practical remote wireless meter reading protocol and data transmission format. Test results show that it has realized the formation of ZigBee network, collection and remote transmission of meter data, terminal equipment parameters modification and other functions to achieve the terminal design requirements.

The Design of the Solar Panels Automatic Tracking Controller

2014 ◽  
Vol 953-954 ◽  
pp. 123-127
Author(s):  
Rong Xia Sun ◽  
Xiao Ning Sun ◽  
Shuo Nan Wang
Keyword(s):  
Control Device ◽  
Light Signal ◽  
Control Circuit ◽  
Signal Acquisition ◽  
Single Chip ◽  
Level Control ◽  
Physical Test ◽  
Automatic Tracking ◽  
Tracking Controller ◽  
Driving Circuit

In this paper, the design is with the single chip microcomputer as the core of automatic tracking controller. The system is mainly composed of the signal acquisition part, the signal conditioning part, a control circuit and a drive circuit. The signal collection circuit composed of photosensitive resistance sensors to collect light signal, signal conversion circuit with voltage follower LM324 convert the change of light intensity to the change of the voltage, through the voltage comparator LM393 produce high and low level control stepping motor rotation; Control circuit use the AT89S52 as the main control device, output different control signals to the driving circuit; Driving circuit use the ULN2003 as driver stepper motor. Is obtained by simulation debugging, physical test, the error rate is less than 5%, in order to realize the efficient utilization of solar energy.

Precise Ranging Technology Application Research Based on IEEE802.15.4a

2014 ◽  
Vol 631-632 ◽  
pp. 558-562
Author(s):  
Zi Hui Wei ◽  
Zheng He Feng ◽  
Zhi Feng Wang ◽  
Duan Bo Cai
Keyword(s):  
Spread Spectrum ◽  
Wide Band ◽  
Impulse Radio ◽  
Line Of Sight ◽  
Test Results ◽  
Application Research ◽  
Technology Application ◽  
Accuracy Test ◽  
Chirp Spread Spectrum ◽  
Received Signal Strength Indication

To solve the poor location accuracy of wireless sensor networks using Received Signal Strength Indication (RSSI) ranging. Time Of Flight (TOF) ranging is used to ensure the accuracy based on two optional physical layer of Impulse Radio-Ultra Wide-Band (IR-UWB) and Chirp Spread Spectrum (CSS) in IEEE802.15.4a. In this paper, we designed ranging module utilizing CSS and UWB. In the Line Of Sight (LOS) and None Line Of Sight (NLOS) environments ranging accuracy test is implemented, the test results show that the IR-UWB ranging technology can achieve higher ranging accuracy and better multipath resistance compared to CSS.

scholarly journals Large-Scale Fabrication of Photonic Nanojet Array via Template-Assisted Self-Assembly

Micromachines ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 473 ◽  
Author(s):  
Pengcheng Zhang ◽  
Xi Chen ◽  
Hui Yang
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Super Resolution ◽  
Light Signal ◽  
Practical Applications ◽  
Photonic Nanojet ◽  
Detection Technology ◽  
Size Uniformity ◽  
Resolution Imaging ◽  
Photonic Nanojets

A large-scale homogenized photonic nanojet array with defined pattern and spacing facilitates practical applications in super-resolution imaging, subwavelength-resolution nanopatterning, nano objects trapping and detection technology. In this paper, we present the fabrication of a large-scale photonic nanojet array via the template-assisted self-assembly (TASA) approach. Templates of two-dimensional (2D) large-scale microwell array with defined pattern and spacing are fabricated. Melamine microspheres with excellent size uniformity are utilized to pattern on the template. It is found that microwells can be filled at a yield up to 95%. These arrayed microspheres on the template serve as microlenses and can be excited to generate large-scale photonic nanojets. The uniformly-sized melamine spheres are beneficial for the generation of a homogenized photonic nanojet array. The intensity of the photonic nanojets in water is as high as ~2 fold the background light signal. Our work shows a simple, robust, and fast means for the fabrication of a large-scale homogenized photonic nanojet array.

scholarly journals Field Application Research of Ultrasonic Partial Discharge Detection Technology in 500kV Reactor

2020 ◽  
Vol 782 ◽  
pp. 032089
Author(s):  
Dewen Zhang ◽  
Xuecheng Zhu ◽  
Hongda Zhang ◽  
Xiaoxu Hu ◽  
Shulei Shang ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Field Application ◽  
Application Research ◽  
Detection Technology ◽  
Discharge Detection

Research on Soft Demodulation of Telemetry Signal Based on the Orthogonal Complex Baseband Rotating MSD

2014 ◽  
Vol 532 ◽  
pp. 152-156
Author(s):  
Gang Fu ◽  
Dong Xu Zhu ◽  
Qian He ◽  
Ming Xin Kou
Keyword(s):  
Test Results ◽  
Soft Demodulation ◽  
Detection Technology ◽  
Symbol Detection ◽  
Signal Demodulation ◽  
And Performance ◽  
Demodulation Method

For PCM/FM telemetry signal demodulation, compared to traditional demodulation method, multiple Symbol Detection technology (Multi - Symbol Detection, MSD) is an effective method for a lower demodulation threshold.[ For software MSD demodulation in the process of PCM/FM telemetry signal algorithm is too complex and cause a large computation takes longer problem, research based on baseband complex rotating orthogonal MSD soft PCM/FM signal demodulation method, this algorithm can greatly reduce the amount of calculation of MSD and performance with the ordinary MSD are basically identical. The simulation and test results verify the effectiveness of the proposed method.

Design of a Double CPU and Distributed Coal Mine Fault Oscillograph

2013 ◽  
Vol 868 ◽  
pp. 306-309
Author(s):  
Wen Yan Nie ◽  
Zhong En Wang
Keyword(s):  
Data Storage ◽  
Coal Mine ◽  
High Performance ◽  
Stable Operation ◽  
Signal Acquisition ◽  
Test Results ◽  
Communication Capacity ◽  
Communication Function ◽  
Data Acquisition Unit ◽  
Signal Acquisition And Processing

Traditional microcomputer fault oscillograph cannot meet the requirements of coal mine substation to digital and networked. A double CPU and distributed coal mine fault oscillograph is presented, the device data acquisition unit of new fault oscillograph use high performance DSP chip TMS320LF2812 to complete signal acquisition and processing, and S3C2410 chip is used in data management unit to complete the data storage, display and communication function. Test results show that the new fault oscillograph could separately installed in each substation and has stable operation and high communication capacity advantages.

Based on Single Chip Microcomputer Intelligent Bathroom Lighting System Design Research

2014 ◽  
Vol 687-691 ◽  
pp. 3212-3215
Author(s):  
An Bi Qin
Keyword(s):  
Intelligent Control ◽  
Design Research ◽  
Test Results ◽  
Lighting System ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Indoor Temperature ◽  
Intelligent Control System ◽  
Zigbee Protocol ◽  
Detection Circuit

The system test results show that the system modules can run normally. When the infrared detection circuit, Zigbee accept module detects information, microcontroller will drive the relay open the lights and headlamp unit, or shut down. In the display, dot matrix can work normally, can carry on the automatic control the fan, DHT11 sensor to detect the indoor temperature, can work normally. Through repeated tests, ZigBee protocol based on HOLTEK microcontroller remote intelligent control system successfully developed bath bully.

Application Research of Method of Noumenon Sampling Detection in Strength Test on Structural Concrete

2012 ◽  
Vol 512-515 ◽  
pp. 3011-3016
Author(s):  
Guo Zhi Zhang ◽  
Liang Guo
Keyword(s):  
Conversion Coefficient ◽  
Concrete Strength ◽  
Strength Test ◽  
Correction Coefficient ◽  
Application Research ◽  
Structural Concrete ◽  
Detection Technology ◽  
Test Result

Noumenon sampling, a new detection technology for strength of structural concrete, is proposed.The conversion relationship between the strength of noumenon sampling specimen and the strength of standard maintenance specimen was explored by correction coefficient and regression analysis．the conversion coefficient for concrete strength between the standard curing specimen and the structural concrete was1.08, which is less than the specification of conversion coefficient(1. 10); therefore, the test result by noumenon sampling is more accurate and reliable.

Sign in / Sign up

Export Citation Format

Share Document