A turbomachine blade monitoring system, comprising: a proximity probe assembly, comprising: an eddy current proximity probe having a probe tip; and a probe case disposed at least partially about the eddy current proximity probe; a probe sheath at least partially disposed about the probe case, wherein the probe sheath is coupled to the probe case by a first threaded connection; a probe tip shroud disposed about the probe tip, wherein the probe tip shroud is coupled to the probe case by a second threaded connection, the probe tip shroud is configured to fill a void between the probe tip and a turbomachine casing when the proximity probe assembly is coupled to the turbomachine casing, and the probe tip shroud comprises a non-metallic material; wherein the eddy current probe is configured to provide a signal indicative of a presence of a turbomachine blade including a time of arrival or a time of departure of the turbomachine blade, wherein the proximity probe assembly is configured to be disposed within a turbomachine casing; and a monitor coupled to the proximity probe assembly, wherein the monitor is configured to monitor a parameter of the turbomachine blade based on the time of arrival or the time of departure of the turbomachine blade indicated by the signal. a proximity probe assembly, comprising: an eddy current proximity probe having a probe tip; and a probe case disposed at least partially about the eddy current proximity probe; a probe sheath at least partially disposed about the probe case, wherein the probe sheath is coupled to the probe case by a first threaded connection; a probe tip shroud disposed about the probe tip, wherein the probe tip shroud is coupled to the probe case by a second threaded connection, the probe tip shroud is configured to fill a void between the probe tip and a turbomachine casing when the proximity probe assembly is coupled to the turbomachine casing, and the probe tip shroud comprises a non-metallic material; wherein the eddy current probe is configured to provide a signal indicative of a presence of a turbomachine blade including a time of arrival or a time of departure of the turbomachine blade, wherein the proximity probe assembly is configured to be disposed within a turbomachine casing; and an eddy current proximity probe having a probe tip; and a probe case disposed at least partially about the eddy current proximity probe; a probe sheath at least partially disposed about the probe case, wherein the probe sheath is coupled to the probe case by a first threaded connection; a probe tip shroud disposed about the probe tip, wherein the probe tip shroud is coupled to the probe case by a second threaded connection, the probe tip shroud is configured to fill a void between the probe tip and a turbomachine casing when the proximity probe assembly is coupled to the turbomachine casing, and the probe tip shroud comprises a non-metallic material; wherein the eddy current probe is configured to provide a signal indicative of a presence of a turbomachine blade including a time of arrival or a time of departure of the turbomachine blade, wherein the proximity probe assembly is configured to be disposed within a turbomachine casing; and a monitor coupled to the proximity probe assembly, wherein the monitor is configured to monitor a parameter of the turbomachine blade based on the time of arrival or the time of departure of the turbomachine blade indicated by the signal.