Exemplary embodiments provide a bioimpedance sensor array for use in fluid flow detection applications, such as heart rate detection. Aspects of the exemplary embodiment include determining an optimal sub-array in a bioimpedance sensor array comprising more than four bioimpedance sensors arranged on a base such that the sensor array straddles or otherwise addresses a blood vessel when worn by a user； passing an electrical signal through at least a first portion of the bioimpedance sensors in the optimal sub-array to the user； measuring one or more bioimpedance values from the electrical signal using a second portion of the bioimpedance sensors in the optimal sub-array； and analyzing at least a fluid bioimpedance contribution from the one or more bioimpedance values.例示性實施例提供一種用於諸如心跳速率偵測的流體流量偵測應用中的生物阻抗感測器陣列。例示性實施例的態樣包含：判定包括四個以上生物阻抗感測器的生物阻抗感測器陣列中的最佳子陣列，所述生物阻抗感測器陣列配置於基底上使得所述感測器陣列在由使用者佩戴時橫跨或以其他方式定址血管；經由所述最佳子陣列中的生物阻抗感測器的至少第一部分將電信號傳遞至所述使用者；使用所述最佳子陣列中的所述生物阻抗感測器的第二部分自所述電信號量測一或多個生物阻抗值；以及自所述一或多個生物阻抗值分析至少流體生物阻抗作用。
