LEUART通信信號(hào)等等方式喚醒。
CPU-50GT/256-300-4-2表面肌電信號(hào)是神經(jīng)肌肉系統(tǒng)在進(jìn)行隨意性和非隨意性活動(dòng)時(shí)的生物電變化經(jīng)表面電極引導(dǎo)、放大、顯示和記錄所獲得的一維電壓時(shí)間序列信號(hào),其振幅約為 0-5000μV,頻率0-1000Hz,信號(hào)形態(tài)具有較強(qiáng)的隨機(jī)性和不穩(wěn)定性。與傳統(tǒng)的針式肌電圖相比,sEMG的空間分辨率相對(duì)較低,但是探測(cè)空間較大,重復(fù)性較好,對(duì)于體育科學(xué)研究、康復(fù)醫(yī)學(xué)臨床和基礎(chǔ)研究等具有重要的學(xué)術(shù)價(jià)值和應(yīng)用意義。
濾波器電路模塊
CPU-50GT/256-300-4-2表面肌電信號(hào)一般只有毫伏級(jí)電壓,信號(hào)中往往夾帶著低頻和高頻的干擾信號(hào),真正有用的肌電信號(hào)大致在10Hz-500Hz之間。除此之外,50Hz的工頻信號(hào)也是一個(gè)重要的干擾源,如果不去除可能會(huì)掩蓋表面肌電信號(hào),根據(jù)這些特殊要求,專(zhuān)用濾波器必須具有隔直、濾波功能,并且要求具有高共模抑制比和好的抗干擾性。低通濾波器采用壓控電壓源型二階低通濾波器。50Hz工頻信號(hào)對(duì)表面肌電信號(hào)的采集有很大的影響,它的頻率恰好在表面肌電信號(hào)能量集中的頻段,且其幅度比表面肌電信號(hào)大1-3個(gè)量級(jí),因此必須除去。本設(shè)計(jì)中采用雙T有源濾波器來(lái)濾除50Hz的工頻信號(hào)
下面來(lái)分析可能引入工頻干擾的途徑:1由空間輻射引入:空間的電磁場(chǎng)可以通過(guò)檢測(cè)設(shè)備中的電極連線(xiàn)、印刷電路板上的連線(xiàn)、器件引腳或器件本身感應(yīng)為相應(yīng)頻率成分的電流,成為噪聲混入肌電信號(hào)??臻g的電磁場(chǎng)可能來(lái)自于多種源,最致命的是電網(wǎng)輻射造成的工頻干擾。2由直流電源引入:檢測(cè)設(shè)備中,為有源器件供電的直流電源通常都是由工頻交流電源變壓、整流、穩(wěn)壓而得到的。直流穩(wěn)壓電源不可能達(dá)到理想的濾波效果。以紋波形式存在的工頻(或其諧波)電流會(huì)通過(guò)電源引入到放大電路中。3由受試者身體引入:暴露于空間電磁場(chǎng)中的受試者身體同樣會(huì)感應(yīng)電磁場(chǎng)而產(chǎn)生感應(yīng)電流,受試者身體所感應(yīng)的工頻電流通過(guò)檢測(cè)電極,與生物電信號(hào)一起加到放大器輸入端,形成工頻干擾。
CPU-50GT/256-300-4-2針對(duì)直流電源引入的工頻干擾,采用電池對(duì)有源器件進(jìn)行供電。采用電池供電不僅避免了整流穩(wěn)壓電源紋波所帶來(lái)的工頻干擾問(wèn)題,而且還消除了因漏電而導(dǎo)致受試者被電擊傷的可能。由于電池的電壓較低,用多節(jié)電池又會(huì)顯得體積龐大,所以采用DC/DC模塊來(lái)升壓解決芯片的供電問(wèn)題。
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CPU-50GT/256-300-4-2
CPU-50GT/256-333-4-2
CPU-50T/256-300-4-2
CPU-50T/256-333-4-2
SCSI-BP4
CPU-60D/32/C3
6604E/16-200
CPCI-731
CPCI-761
IOBP-731
PMC860-40-E1-75
SCSI-BP4
IOBP-731
IOBP-10
IBC-20-1
SYS68K/PIO-1
CPCI-910
CPU-5V/64-110-2/C13
Force SYS68K CPU-30Lite
FORCE SYS68K DRAM VME BOARD MVME MAINFRAME MOTOROLA
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Force SYS68K/CPU-6VB P/N 100611 LAM reseach 17034-3-C
FORCE SYS68K ISCSI-1 VME BOARD MVME MAINFRAME MOTOROLA
FORCE COMPUTERS SYS68K CPU-6A
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FORCE SYS68K CPU-30BE/16 VME BOARD
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Force SYS68K/SASI-1
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BUS TRONIC FORCE SYS68K MAINFRAME BOARDS NICE LOT
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INNOVATIVE TECHNOLOGY P-480 NN3 WIRE SURGE SUPRESSOR
ALLEN BRADLEY 1747-DTAM DATA TABLE ACCESS MODULE SER. B 1747DTAM
FANUC A16B-2200-0310/03A PC BOARD A16B2200031003A
CHROMALOX ARMT0-3155E2T2WXX IMMERSION HEATER, 160V, 3YPH, 1.5KW
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AEG SCHNEIDER AUTOMATION TSX1722012 PLC CONTROLLER TSX17-20 DC 20I/O TRANS
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ITW DYNATEC BF0441BD2S MEAD BOX APPLICATOR HEAD 240V 220W
CISCO WS-X5234-RJ45 24 PORT 10/100TX SWITCH MODULE FS
INDRAMAT DSM2.1-S11-01.RS PROGRAMMING MODULE DSM21S1101RS
NIB ALLEN BRADLEY 609U-AAB MANUAL STARTER SIZE 0
KGK AW-2304 PUMP RATION 45X1 104M2 AW02304
FURNAS 42DE35AG106 MAGNETIC CONTACTOR DEFINITE PURPOSE 50AMP 3POLE 600VAC MAX
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