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lock-in

The file is about lock-in amplifier and how it can apply to the use of our daily life

The file is about lock-in amplifier and how it can apply to the use of our daily life

標簽： amplifier lock-in about apply

上傳時間： 2013-12-11

上傳用戶：koulian
Use Dspic30F4011 for design a lock-in Amplifier-Vietnamese

Use Dspic30F4011 for design a lock-in Amplifier-Vietnamese

標簽： Amplifier-Vietnamese lock-in design Dspic

上傳時間： 2014-01-02

上傳用戶：問題問題
2012TI電子設(shè)計大賽——微弱信號檢測裝置

微弱信號檢測裝置四川理工學院劉鵬飛、梁天德、曾學明摘要：本設(shè)計以TI的Launch Pad為核心板，采用鎖相放大技術(shù)設(shè)計并制作了一套微弱信號檢測裝置，用以檢測在強噪聲背景下已知頻率微弱正弦波信號的幅度值，并在液晶屏上數(shù)字顯示出所測信號相應的幅度值。實驗結(jié)果顯示其抗干擾能力強，測量精度高。關(guān)鍵詞：強噪聲；微弱信號；鎖相放大；Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言隨著現(xiàn)代科學技術(shù)的發(fā)展，在科研與生產(chǎn)過程中人們越來越需要從復雜高強度的噪聲中檢測出有用的微弱信號，因此對微弱信號的檢測成為當前科研的熱點。微弱信號并不意味著信號幅度小，而是指被噪聲淹沒的信號，“微弱”也僅是相對于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號的幅度，才能提取出有用信號。微弱信號檢測技術(shù)的應用相當廣泛，在生物醫(yī)學、光學、電學、材料科學等相關(guān)領(lǐng)域顯得愈發(fā)重要。 2、方案論證針對微弱信號的檢測的方法有很多，比如濾波法、取樣積分器、鎖相放大器等。下面就針對這幾種方法做一簡要說明。方案一：濾波法。在大部分的檢測儀器中都要用到濾波方法對模擬信號進行一定的處理，例如隔離直流分量，改善信號波形，防止離散化時的波形混疊，克服噪聲的不利影響，提高信噪比等。常用的噪聲濾波器有：帶通、帶阻、高通、低通等。但是濾波方法檢測信號不能用于信號頻譜與噪聲頻譜重疊的情況，有其局限性。雖然可以對濾波器的通頻帶進行調(diào)節(jié)，但其噪聲抑制能力有限，同時其準確性與穩(wěn)定性將大打折扣。

標簽： 2012 TI 電子設(shè)計大賽微弱信號

上傳時間： 2013-11-04

上傳用戶：lty6899826
基于開關(guān)電容技術(shù)的鎖定放大器設(shè)計

鎖定放大是微弱信號檢測的重要手段。基于相關(guān)檢測理論，利用開關(guān)電容的開關(guān)實現(xiàn)鎖定放大器中乘法器的功能，提出開關(guān)電容和積分器相結(jié)合以實現(xiàn)相關(guān)檢測的方法，并設(shè)計出一種鎖定放大器。該鎖定放大器將微弱信號轉(zhuǎn)化為與之相關(guān)的方波，通過后續(xù)電路得到正比于被測信號的直流電平，為后續(xù)采集處理提供方便。測量數(shù)據(jù)表明鎖定放大器前級可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓，后級通過帶通濾波器級聯(lián)可將信號放大1×105倍。該方法在降低噪聲的同時，可對微弱信號進行放大，線性度較高、穩(wěn)定性較好。 Abstract: lock-in Amplifying（LIA）is one of important means for weak signal detection. Based on cross-correlation detection theory， switch in the swithched capacitor was used as multiplier of LIA， and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave， then DC proportional to measured signal was obtained through follow-up conditioning circuit， providing convenience for signal acquisition and processing. The measured data shows that the electric current（10-6 A） can be changed into voltage（10-1 V） by LIA， and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.

標簽： 開關(guān)電容鎖定放大器

上傳時間： 2013-11-29

上傳用戶：黑漆漆
Open Source for the Enterprise Open source software is changing the world of Information Technolo

Open Source for the Enterprise Open source software is changing the world of Information Technology. But making it work for your company is far more complicated than simply installing a copy of Linux. If you are serious about using open source to cut costs, accelerate development, and reduce vendor lock-in, you must institutionalize skills and create new ways of working. You must understand how open source is different from commercial software and what responsibilities and risks it brings. Open Source for the Enterprise is a sober guide to putting open source to work in the modern IT department.

標簽： Open Information Enterprise the

上傳時間： 2013-12-27

上傳用戶：R50974
Features • Compatible with MCS-51® Products • 8K Bytes of In-System Programmable (ISP

Features • Compatible with MCS-51® Products • 8K Bytes of In-System Programmable (ISP) Flash Memory – Endurance: 1000 Write/Erase Cycles • 4.0V to 5.5V Operating Range • Fully Static Operation: 0 Hz to 33 MHz • Three-level Program Memory Lock • 256 x 8-bit Internal RAM • 32 Programmable I/O Lines • Three 16-bit Timer/Counters • Eight Interrupt Sources • Full Duplex UART Serial Channel • Low-power Idle and Power-down Modes • Interrupt Recovery from Power-down Mode • Watchdog Timer • Dual Data Pointer • Power-off Flag

標簽： 8226 Programmable Compatible In-System

上傳時間： 2015-06-27

上傳用戶：dianxin61
About: hamsterdb is a database engine written in ANSI C. It supports a B+Tree index structure, uses

About: hamsterdb is a database engine written in ANSI C. It supports a B+Tree index structure, uses memory mapped I/O (if available), supports cursors, and can create in-memory databases. Release focus: Major feature enhancements Changes: This release comes with many changes and new features. It can manage multiple databases in one file. A new flag (HAM_LOCK_EXCLUSIVE) places an exclusive lock on the file. hamsterdb was ported to Windows CE, and the Solution file for Visual Studio 2005 now supports builds for x64. Several minor bugs were fixed, performance was improved, and small API changes occurred. Pre-built libraries for Windows (32-bit and 64-bit) are available for download. Author: cruppstahl

標簽： C. hamsterdb structure database

上傳時間： 2013-12-11

上傳用戶：LouieWu
If you have programming experience and a familiarity with C--the dominant language in embedded syste

If you have programming experience and a familiarity with C--the dominant language in embedded systems--Programming Embedded Systems, Second Edition is exactly what you need to get started with embedded software. This software is ubiquitous, hidden away inside our watches, DVD players, mobile phones, anti-lock brakes, and even a few toasters. The military uses embedded software to guide missiles, detect enemy aircraft, and pilot UAVs. Communication satellites, deep-space probes, and many medical instruments would have been nearly impossible to create without embedded software.

標簽： familiarity programming experience dominant

上傳時間： 2013-12-11

上傳用戶：362279997
學習Direct3D中的2D-Focus.On.2D.in.Direct3D.-.fly

學習Direct3D中的2D-Focus.On.2D.in.Direct3D.-.fly

標簽： Direct3D D-Focus Direct fly

上傳時間： 2013-08-04

上傳用戶：eeworm
游戲開發(fā)大全-game.programming.all.in.one

游戲開發(fā)大全-game.programming.all.in.one

標簽： programming game all one

上傳時間： 2013-06-30

上傳用戶：eeworm

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lock-in

The file is about lock-in amplifier and how it can apply to the use of our daily life

Use Dspic30F4011 for design a lock-in Amplifier-Vietnamese

2012TI電子設(shè)計大賽——微弱信號檢測裝置

基于開關(guān)電容技術(shù)的鎖定放大器設(shè)計

Open Source for the Enterprise Open source software is changing the world of Information Technolo

Features • Compatible with MCS-51® Products • 8K Bytes of In-System Programmable (ISP

About: hamsterdb is a database engine written in ANSI C. It supports a B+Tree index structure, uses

If you have programming experience and a familiarity with C--the dominant language in embedded syste

學習Direct3D中的2D-Focus.On.2D.in.Direct3D.-.fly

游戲開發(fā)大全-game.programming.all.in.one