Fig. 1. Geometry of one laser beam through tomography field

Fig. 2. Regular configuration with 25 emitters and 25 receivers. (a) Structure of sensor; (b) schematic diagram of beam distribution; (c) sensitivity map; (d) angular location distribution

Fig. 3. Reconstruction error varying with uniformity coefficient

Fig. 4. Optimization based on genetic algorithm

Fig. 5. Optimization results of genetic algorithm. (a) Iteration process of genetic algorithm; (b) schematic diagram of sensor arrangement of optimized configuration

Fig. 6. Beam distribution map and sensitivity map. (a)-(c) Beam distribution map; (d)-(f) sensitivity map

Fig. 7. Specific distributions of five structures. (a) Single phantom with "hard-edge"; (b) double phantoms with "hard-edge"; (c) Gaussian phantom with "soft-edge"; (d) cross structure with "hard-edge"; (e) concave structure with "hard-edge"

Fig. 8. Reconstruction results of three configurations. (a)(d)(g)(j)(m) Random configuration; (b)(e)(h)(k)(n) regular configuration; (c)(f)(i)(l)(o) optimized configuration

Fig. 9. Local reconstruction error at central axis of random configuration, regular configuration and optimized configuration. (a) Random configuration; (b) regular configuration; (c) optimized configuration