Based on the analyze of the infrared object detection mechanism, a new physical quantifier --detectability, which is
used to describe how difficult it is to detect an object, has been defined. The change of flying velocity influence the
radiation characteristic; the change of flying altitude also influence the radiation characteristic of the object ,the radiation
characteristic of atmosphere background, the most effect view of detector for the object, atmospheric transmittance of the
path and so on. Based on the large number of calculation, the article analyses the rule of the influence and change, the
influence that the flying altitude and velocity to infrared band detectability. The analyzing result show that when the
flying velocity of target enhances 0.5 Mach, the work range will enhance 5 kilometers for the same infrared detector. The
detectability of an object will increase as the flying altitude increasing until reach the 8 kilometers; at the altitude of 8 to
10 kilometers the detectability reaches the max, when the altitude overrun 10km the detectability of an object will reduce
as the altitude increase.
The overhead contact system is the power supply unit of the electric locomotive. This article is to introduce our newly
developed method to measure the height and pull out value of the contact wire. A carema dolly which can move on
railway is applied to bear the weight of the measure equipment; two linear CCD cameras are installed on the dolly
symmetrically about the midline of two rails. While the dolly move along the railway, two CCD cameras grasp the image
synchronously, and a computer real-time process the images, the height and pull out value can be calculate out from the
This article is to introduce a newly developed method to measure three-dimensional displacement by only a single
camera. To measure the 3-D displacement of the two objects A and B, two lighting diodes are fixed on object A. A
convex and a translucent screen are fixed on object B, a CCD camera is joined together with the screen. The lighting
diodes project two faculae on the screen throgh the lens. The position of the faculae can be detected by the CCD camera.
The 3-D displacement of A and B can be calculated according to the position of faculae.