A method of operating a particulate sensor assembly arranged in a turbine engine gas flow-path (A, B, C), comprising: emitting a first light at a wavelength between 380 nanometers and 600 nanometers from a first light source; emitting a second light at a wavelength between 600 nanometers and 2000 nanometers from a second light source; detecting a scattered light from each of the first light and the second light at a plurality of first light sensing devices (402, 404, 406), the plurality of first light sensing devices including a first light sensor defining a forward-scatter sensing detection volume having a first scattering angle of between 0° and 60°, a second light sensor defining a mid-scatter sensing detection volume having a second scattering angle of between 60° and 120°, and a third light sensor defining a backscatter sensing detection volume having a third scattering angle between 120° and 240°, wherein the first light sensor, the second light sensor and the third light sensor are aligned on a common axis (X-X'), and wherein the first light source and the second light source are divided by the common axis (X-X'); emitting a third light at a wavelength between 220 nanometers and 405 nanometers from a plurality of third light sources; and detecting scattered light from the third light at a plurality of fluorescent light sensing devices, wherein each of the third light sources is paired with a fluorescent light sensing device, each paired third light source and fluorescent light sensing device being divided by the common axis (X-X'), wherein the detection of scattered light is determinative between categories of foreign object debris including solid objects and particulates including silicate sand, water vapor, dust, volcanic ash, sea-salt aerosol, and smoke, wherein the particulate sensor assembly includes a multi-angle, multi-wave array of sensing elements, the multi-angle, multi-wave array of sensing elements comprising a first set of sensing elements and a second set of sensing elements, the first set of sensing elements including the first light source, the second light source, and the plurality of first light sensing devices (402, 404, 406); the second set of sensing elements including the plurality of third light sources and the plurality of fluorescent light sensing devices, wherein the common axis (X-X') is generally aligned with direction airflow in the flow-path (A, B, C). emitting a first light at a wavelength between 380 nanometers and 600 nanometers from a first light source; emitting a second light at a wavelength between 600 nanometers and 2000 nanometers from a second light source; detecting a scattered light from each of the first light and the second light at a plurality of first light sensing devices (402, 404, 406), the plurality of first light sensing devices including a first light sensor defining a forward-scatter sensing detection volume having a first scattering angle of between 0° and 60°, a second light sensor defining a mid-scatter sensing detection volume having a second scattering angle of between 60° and 120°, and a third light sensor defining a backscatter sensing detection volume having a third scattering angle between 120° and 240°, wherein the first light sensor, the second light sensor and the third light sensor are aligned on a common axis (X-X'), and wherein the first light source and the second light source are divided by the common axis (X-X'); emitting a third light at a wavelength between 220 nanometers and 405 nanometers from a plurality of third light sources; and detecting scattered light from the third light at a plurality of fluorescent light sensing devices, wherein each of the third light sources is paired with a fluorescent light sensing device, each paired third light source and fluorescent light sensing device being divided by the common axis (X-X'), wherein the detection of scattered light is determinative between categories of foreign object debris including solid objects and particulates including silicate sand, water vapor, dust, volcanic ash, sea-salt aerosol, and smoke, wherein the particulate sensor assembly includes a multi-angle, multi-wave array of sensing elements, the multi-angle, multi-wave array of sensing elements comprising a first set of sensing elements and a second set of sensing elements, the first set of sensing elements including the first light source, the second light source, and the plurality of first light sensing devices (402, 404, 406); the second set of sensing elements including the plurality of third light sources and the plurality of fluorescent light sensing devices, wherein the common axis (X-X') is generally aligned with direction airflow in the flow-path (A, B, C).