Abstract: Vehicle detector arrangement comprising at least one detector unit (8) comprising at least one sensor (47, 48, 49, 50), a transmission/reception unit (54), an energy supply unit and a control unit (51, 52, 53), whereby the energy supply unit comprises a solar cell module (3). The transmission/reception unit (54), the energy supply unit and the control unit (51, 52, 53) are accommodated in a housing (27, 28) and connected to the at least one detector unit (8), whereby the solar cell module (3) is secured to the outside of the housing (27, 28). As a result of what is thus autonomous functioning of the vehicle detector arrangement, it can be simply secured, for example, to a bridge (6), and complicated installation jobs for power supply and data transmission, for example to a traffic routing center, are avoided.

Abstract: An improved optical assembly which provides a panoramic field of view for infrared motion detection. In one form of the invention the optical assembly comprises a spherical section having an inner surface and an outer spherical surface, the outer spherical surface having a radius of curvature centered in a focal region which is suitable for placement of an infrared detector. The inner surface of the spherical section comprises a plurality of circular convex lenses, each lens having an optical axis passing through the focal region. The combination of the outer spherical surface with each circular convex lens forms a biconvex lens having a focal point in the focal region. Radiation received by each biconvex lens from a zone in the field of view is focused in the focal region for sensing by the infrared detector.