The performance of active spectral reflectance sensors as influenced by measuring distance, device temperature and light intensity.

Highlights: [•] Ambient conditions and sensor–plant distances may affect active sensors’ performance. [•] Effects of changes in light and temperature on three active sensors were investigated. [•] Active sensors’ performance is hardly affected by changes in light intensity. [•] Distance between the sensor and the target surface needs to be considered. [•] Varying device temperature should be taken into account. [ABSTRACT FROM AUTHOR]