【摘要】 我们用两套ＨＴｃｒｆＳＱＵＩＤ组成一阶梯度计，在无屏蔽条件下，进行了心磁图测量．实验结果表明，在利用了梯度计消除环境噪声，再通过平均、数字滤波等方法进一步提高信噪比后，我们测得的心磁图中，可以清楚地看到Ｐ、Ｑ、Ｒ、Ｓ、Ｔ等各个波，其信噪比达到１２０ ，已可满足实用的要求．更多还原

【Abstract】 We developed a first order gradiometer with two sets of H T\-c rf SQUIDs and recorded the magnetocardiography (MCG) in an unshielded environment by using this gradiometer. We also used digital filtering and averaging methods to improve the Signal Noise Ratio (SNR). The MCG we took had a SNR of 120 and its structure ( P wave, Q,R,S complex, T wave) can be seen clearly.更多还原