Infrared Target

Four-bar target: used for minimum resolvable temperature difference (MRTD) testing. A set with different spatial frequencies tests MRTD, and targets of different bar widths (spatial frequencies) all fit a rotating target wheel. Crosshair/circular-hole target: an alignment target for axis alignment, aiming, and focusing, manufactured with circular holes and cross patterns. Triangle target: tests triangle orientation discrimination (TOD) in infrared thermal imagers. TOD resembles MRTD or MDTD testing but is more advanced theoretically and practically. Double four-bar target: uses vertical and horizontal four-bar patterns to test MRTD and save time. Circular-hole target: tests minimum detectable temperature difference (MDTD) and can also support axis alignment or aiming. Multiple four-bar target: efficiently tests MRTD; one target with multiple four-bar patterns can replace a series of single-pattern four-bar targets. Square target: tests noise-equivalent temperature difference (NETD), fixed-pattern noise (FPN), signal transfer function (SITF), aperiodic transfer function (ATF), and other parameters. Multiple circular-hole target: efficiently tests MDTD; one target with multiple holes replaces a series of single-hole targets. Slit target: manufactured with rectangular patterns of different widths for slit response function (SRF) testing. Crosshair target: evaluates image-processing algorithm effectiveness in noise testing. Knife-edge target: measures modulation transfer function (MTF) from the knife edge's line spread function and is manufactured with a sharp half-moon edge. Silhouette target: evaluates the tested camera's recognition range for real targets.