With the development of the opto-electronic technology, the laser proximity fuze has been widely used in the field of surface to air missile, air to air missile, etc. RF Proximity Fuze, Laser Proximity Fuze, Warhead, Detonator, Booster, The proximity fuze is a vital component of the missile since it seldom so happens that. photonic proximity sensor for munition fuze applications. suitable for proximity fuzing applications. of the projectile, the laser transmits a highly collimated.
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In order to improve the detection distance of laser proximity fuze without increasing laser power, the capability of laser fuze receiving weak laser echo signal must be improved.
An avalanche photodiode APDwhich had the advantages of high sensitivity, low noise, with inner gain, was used as photodetector in laser fuze system to improve the capability of laser fuze detecting weak signal. The equivalent noise model of APD photoelectric conversion was analyzed, and the low-noise preamplifier and voltage amplification circuit matching the avalanche photodiode were designed. The noise ratio lzser frequency bandwidth of amplification circuit were analyzed and calculated, also the simulation and experimental verification were accomplished.
The results showed that the circuit has wide bandwidth and high signal to noise ratio,which llaser the requirements of subsequent processing circuitry of laser fuze. Advanced Materials Research Volumes Progress in Applied Sciences, Engineering and Technology. Power basic frequency interference was removed by 50 Hz trap filter. Power harmonic interference, electrode polarization interference and my electricity interference were removed by low- pass filter.
Defense & High Tech: Laser Proximity Fuze
Baseline drift was removed by high- pass filter. At the same time; we test the performance of acquisition circuit, filter circuit and amplification circuit. As a result, it is shown that the system can well collect and process ECG signal. This paper studies a low noise amplifier design method for 5.
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The LNA meet the design requirements. Array induction logging tools AILT detects the stratum conductivity based on the principle of electromagnetic induction, as a result, the signal of priximity amplitude using the AILT is in microvolt level.
The small-signal is always drowned by noise at high-temperature and high-pressure condition. In order to collect the weak signal accurately, we propose a design method of signal modulator circuits based on the principle of differential amplifier and active band-pass filter with second band limitless gain and multi-path negative feedback.
First, make the induction signal obtained from the coil two stages amplification. Then Execute two-order band-pass filter to the enlarged signal. At last, process the filtered signal by the backward circuits.
Simulating the circuits by Pspice So the Simulation verifies the feasibility of the signal modulator circuit. In this paper, the two main reasons are introduced such as great varying range of echo signal power and pulse signal error, which affect the pulse laser ranging accuracy and analyzed on the base of the pulsed laser range finding method.
For them, the methods are provided that the AGC technology in the receiving circuit is adopt to extend the dynamic range of the receiver, and gain the high precision receiving pulse signal by using pfoximity voltage comparator.
Then the problems of great varying range of echo proxximity caused by different measuring distance and contacting the timing circuit are resolved efficiently. The echo signal received by laser fuze was very weak when the detection range increased. In order to expand the operating range of fuze, the reception capacity of fuze for weak signal should be improved.
According to the requirements of long-range laser fuze receiving system as small volume, low-power, low-noise, high-gain, the amplifying circuit of the receiving system was analyzed and designed.
To improve the ability of laser fuze for detecting weak signal, the high-sensitive, low-noise, inner-gain avalanche photodiode APD was used as a photodetector in the system, and the low-noise preamplifier and voltage amplifying circuit was designed. The noise and frequency response of the amplifying circuit was researched and analyzed by simulation and experiment.
The results show that the design is effective and feasible, which can meet the requirements of processing circuit as receiving weak signal from long-distance.