A method that measures relatively position relation between two vehicles fleetly and accurately that are both on a horizontal plane is proposed in the article. When manipulator rotates horizontally, the linear CCD vidicon that is on the end of manipulator on the loading vehicle scans two point targets that are on the launching vehicle, and then we can utilize spatial intersection principle and trigonometry theorem to get relatively position relationship. I.e. the coordinate parameters: x, y, z, α. Error analysis and the simulation on computer validate: the measurement error of length is less than ±0.84mm; that of angle is less than ±2'6'', which satisfies technical requests. So the method is feasible. The research is not only significant for missile of automatic transshipment, but also is valuable in theoretic research on method of measuring spatial position relationship.
Proc. SPIE. 5629, Lasers in Material Processing and Manufacturing II
KEYWORDS: Ferroelectric materials, Digital signal processing, Modulation, Control systems, Signal processing, Analog electronics, Feedback control, Digital electronics, Beam controllers, Temperature metrology
The new design about a CW, digital all-solid-stated LD pumped Nd:YVO4 controller is introduced. The stable output power of this digital laser controller which adopts Digital Signal Processor (TMS320C31) is approximately 20mW. The whole system is composed of constant- current source, protection circuit, pulse-width modulation circuit, Si-photo-detector and amplified circuit and Digital Signal Processor control system, etc. In terms of error deviation Based on nonlinear control curves of LD power output by Si-photo-detector, the region control can be obtained by means of the PID control algorithm in the software platform, that is, error amendment and high stability laser power output can be achieved. And the precision of temperature control can reduce from ±0.2°C to ±0.04°C. By adopted integral separated mode PID control algorithm, the LD output power instability (σ%) down to ±2%. By way of adopting the new digital design, the work to protect the laser diode, including the continuous adjustable output power with high accuracy and stability, is easily obtained. The internal-external modulation control of the laser power based on digital optical feedback can be accomplished with stable power output. At last, the bringing reasons of noise are analyzed and the solving methods are put forward in this paper.