Many imaging systems, such as those used in surveillance and targeting systems, include a laser or other light beam projector, such as a laser pointer, laser rangefinder, or laser designator for target designation, rangefinding, or other uses. To ensure accurate aim of the laser beam, the laser beam is typically boresighted (e.g., aligned) to an imaging sensor of the imaging system, for example, to the location of a reticle displayed in images captured by the imaging sensor. For laser designation in military weapons systems, boresighting of laser designators to imaging sensors is of significant importance for accurate delivery of ordinance. However, the alignment between the laser beam and the imaging sensor inevitably drifts over time and temperature.
To account for the drift in the alignment, some imaging systems are provided with a boresighting module to perform rapid, automatic boresighting periodically or prior to using the laser beam in the field. However, due to the complex optical arrangement, conventional boresighting modules are typically too complex and bulky for compact applications that fit within and/or selectively move in and out of the optical path of imaging system package. Furthermore, for a target object utilized in boresighting, conventional boresighting modules typically enclose a thermal target that burns away or otherwise deteriorates over use and must be replaced regularly. While imaging systems for surveillance and targeting often include multiples imaging sensors with different wavelength responsivity, conventional boresighting modules typically do not allow for simultaneous boresighting of multiple imaging sensors in imaging systems.