LifeSights
LifeSights are a unique type of infantry-based sensor often equipped on the helmets of Compact infantrymen. These small, white devices integrate heartbeat sensors with chemoreceptive sensors, particularly for ammonia, with the intent to detect enemy troops through obstacles - primarily vegetation, but also with a tenability of detecting life through walls, depending on the thickness of the obstacle.
In regards to detecting heartbeats, the device utilizes ultra-wideband impulse radar technology, with such pulses penetrating thin walls and other obstacles. The radar signals are processed to extract heartbeat information and remove the effects of interference from the obstacles, which would otherwise make it indiscernible. As a fallback mechanism, the device can switch to utilize chemoreception, in which it primarily discerns ammonia-based chemical signals from the background environment. This is as a result of ammonia being a byproduct of human physiological processes, and can be detected using electrochemical sensors. However, this secondary mechanism is unreliable since ammonia can be introduced into the environment through other sources, such as the local environment or deliberate human misdirection.
LifeSights are best utilized in a non-ammonia atmospheric and geological environment without a large degree of wildlife in the area, as both variables can render the device greatly ineffective; heartbeat sensors can have their sensitivities adjusted to match that of the waves from an average sized human heart, but this in itself can be spoofed if created from a device that mimics such. As a result of these variables, they are often best utilized in environs with very low ammonia content and no other organic life - primarily space infrastructure or vessels, or planetary terrains of low life content.