NOVELTY - The interrogation unit has a control module for controlling lasers (711, 721, 731) to provide a pulsed signal to sensors (718, 728, 738), where each period of the pulsed signal includes a first component and a second component. A reading module receives at a return signal comprising reflections of the pulsed signal from the sensor, reads reflections of the first component or the second component, and provides resonant frequency information based on the read reflections. A determination module determines resonant frequency of the sensor based on the resonant frequency information.    USE - Sensor interrogation unit for interrogating a sensor i.e. micro-electromechanical system (MEMS) sensor (claimed), used for measuring environmental conditions such as temperature and pressure, of higher temperature environments i.e. geothermal well and oil well.    ADVANTAGE - The interrogation unit achieves improved accuracy by reducing or eliminating heating of the sensor. The interrogation unit maintains intensity at relatively low energy to eliminate or reduce excitation of the sensor by the second component and/or to minimize energy delivered to the sensor during reading period, thus reducing total or average energy delivered to the sensor. The interrogation unit ensures that sensors are distributed about a shared cable while allowing ready identification of portions of signals corresponding to each sensor with each sensor associated with unique wavelength of reflections, thus eliminating need for separate cables for each sensor. The interrogation unit virtualizes and hosts individual components by a cloud type computational environment to allow dynamic allocation of computational power without requiring the user concerning a location, a configuration, and/or specific hardware of the computer system.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for interrogating a sensor    (2) a tangible and non-transitory computer readable medium comprising a set of instructions for interrogating a sensor.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a measurement system.    Laser modules (710, 720, 730)    Lasers (711, 721, 731)    Sensors (718, 728, 738)    Junction module (740)    Dividers (742, 744)