现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
4期
137-141,144
,共6页
复阻抗%双联对置涡流传感器%相敏检测%硬币机读特征
複阻抗%雙聯對置渦流傳感器%相敏檢測%硬幣機讀特徵
복조항%쌍련대치와류전감기%상민검측%경폐궤독특정
complex impedance%dual opposed eddy current sensor%phase sensitive detection%coin machine-readable feature
与硬币自动识别相关的硬币电磁参数称为硬币的机读特征。传统的硬币机读特征识别方法具有检测参数温飘大、一致性差、检测参数单一等缺陷。在此采用相关检测方法对硬币机读特征检测线圈的复阻抗变化进行检测,从而获得检硬币机读特征。检测系统采用DDS的正交激励信号具有波生波形良好,频率、相位和幅值稳定的有点。采用相关检测方法,电路从本质上改善了对硬币差异形成的微弱信号的捕获能力,有利于实现硬币机读特征的在线检测。利用双联对置涡流传感器能有效地克服温漂和提高信号的动态范围,每枚硬币可以检测两次,通过数据处理后可以获得更加准确的结果。结果表明该系统能够检测出微小的硬币机读特征差异,具有良好的稳定性和可重复性。
與硬幣自動識彆相關的硬幣電磁參數稱為硬幣的機讀特徵。傳統的硬幣機讀特徵識彆方法具有檢測參數溫飄大、一緻性差、檢測參數單一等缺陷。在此採用相關檢測方法對硬幣機讀特徵檢測線圈的複阻抗變化進行檢測,從而穫得檢硬幣機讀特徵。檢測繫統採用DDS的正交激勵信號具有波生波形良好,頻率、相位和幅值穩定的有點。採用相關檢測方法,電路從本質上改善瞭對硬幣差異形成的微弱信號的捕穫能力,有利于實現硬幣機讀特徵的在線檢測。利用雙聯對置渦流傳感器能有效地剋服溫漂和提高信號的動態範圍,每枚硬幣可以檢測兩次,通過數據處理後可以穫得更加準確的結果。結果錶明該繫統能夠檢測齣微小的硬幣機讀特徵差異,具有良好的穩定性和可重複性。
여경폐자동식별상관적경폐전자삼수칭위경폐적궤독특정。전통적경폐궤독특정식별방법구유검측삼수온표대、일치성차、검측삼수단일등결함。재차채용상관검측방법대경폐궤독특정검측선권적복조항변화진행검측,종이획득검경폐궤독특정。검측계통채용DDS적정교격려신호구유파생파형량호,빈솔、상위화폭치은정적유점。채용상관검측방법,전로종본질상개선료대경폐차이형성적미약신호적포획능력,유리우실현경폐궤독특정적재선검측。이용쌍련대치와류전감기능유효지극복온표화제고신호적동태범위,매매경폐가이검측량차,통과수거처리후가이획득경가준학적결과。결과표명해계통능구검측출미소적경폐궤독특정차이,구유량호적은정성화가중복성。
Coins’electromagnetic parameters related to automatic coin recognition are called coin machine readable fea-tures. Traditional method of automatic coin recognition has big defection temperature drift,poor consistency,sole detecting pa-rameter and so on. In this paper,the method to detect complex impedance variation of coin machine readable feature detecting coil is proposed in this paper. The detecting system can generate orthogonal excitation signal,which has perfect waveform,and stable frequency,phase and amplitude. By the relevant detection method,the circuit can essentially improve the ability to cap-ture the weak signal formed by the difference between coins. It is conducive to the realization of online detection for coin ma-chine readable features. The system can effectively overcome the temperature drift and improve the dynamic range of signal by using dual opposed eddy current sensor. Every coin can be detected twice,thus more accurate results can be obtained by data processing. The testing results show that the system can detect the tiny difference of coin machine readable feature,and has good stability and repeatability.