first electronic signal s 1 from the photo detecting device 14 may be directed through a first conduit 16 such as a conductive wire or fiber optic cable to an electronic signal conditioner 18 the electronic signal conditioner 18 may be in the form of an electronic filter amplifier lock in amplifier etc the electronic signal conditioner 18 converts the first electronic signal s 1 generated by the photo detecting device 14 into a modified electronic signal s 2 for further processing in some examples an electronic signal conditioner 18 is not included the modified electronic signal s 2 is directed through a second conduit 20 such as a conductive wire or fiber optic cable to an array of two or more electro mechanical acoustic resonators 22 some examples of electro mechanical acoustic resonators 22 are quartz crystal tuning forks quartz crystal microbalances microcantilevers and piezoelectric actuators having high quality factors q as described in the above example the resonant frequencies of the array of two or more electro mechanical acoustic resonators 22 should have pulse frequencies that are equal to or a harmonic of the various light pulses l detected by the photo detecting device 14 in this way the high quality factors q of the electro mechanical acoustic resonators 22 are energized by the modified electronic signal s 2 a damped electronic signal s 3 is generated and output by the array of electro mechanical acoustic resonators 22 and is directed through a third conduit 24 for analysis and or further conditioning in a downstream device 26 for example the downstream device 26 may be an electronic circuit a graphic display unit a storage device etc in some examples a downstream device 26 is not included standoff detection.