Device for conducting position detection using modulation light beam and detection method

A technology of modulating light beams and detectors, applied in the field of detection, can solve the problems of large dark current, limited effective distance of position detection, unrealistic, etc., to achieve accurate position information, improve the accuracy and sensitivity of system position detection, and eliminate the effects of influence

Inactive Publication Date: 2005-10-05
NANJING UNIV
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Problems solved by technology

[0004] In the current free-space optical communication system, the position-sensitive detector in the ATP device adopts the direct detection method in the position detection application. In order to improve the performance, it is generally used to add a filter to the optical lens part to filter out part of the background light. However, since the dark current of position-sensitive detectors is generally very large, the dark current of a 10×10mm position-sensitive detector at room temperature is 200nA, coupled with the influence of background light, the sensitivity of the s

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  • Device for conducting position detection using modulation light beam and detection method
  • Device for conducting position detection using modulation light beam and detection method
  • Device for conducting position detection using modulation light beam and detection method

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Embodiment Construction

[0025] Such as figure 2Shown is a block diagram of an ATP system with an independent beacon light. The system includes a shared antenna, a transmitting unit, a receiving unit, and a control unit. The transmitting unit includes a beacon light source, a signal light source, a beam expander collimator, and a multiplexer. After the beacon light generated by the beacon light source and the signal light generated by the signal light source are respectively beam expanded and collimated, the two optical signals are combined into one by the wave combining plate, and then transmitted by the common antenna; the receiving unit includes a wave splitting plate, The signal light processing device, the position sensitive detector and the signal processing circuit, share the light beam emitted by the space object received by the antenna and transmit it to the sub-wave plate, and the signal light and beacon light are separated by the sub-wave plate, and the signal light is transmitted to the si...

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Abstract

Signal processing circuit is position-sensing detector with its four pins connected to I/V converter, multiplier, low-pass filter and A/D converter respectively in series. The four routes are connected to single chip in parallel. A/D converter is connected to feedback end of square-wave generator, and output end of square-wave generator is connected to input end of multiplier in each router. Detecting method is as following: modulated by square-wave in certain frequency, beacon light is transmitted at transmitting end. Following operations are carried out at receiving end: receiving modulated light by the position-sensing detector, its output is connected to I/V converter; output of the I/V converter and square-wave are input to multiplier; result from the multiplier through filter and A/D converter is converted to four routes, which are input to single chip to calculate position information. Feedback control and differential processing remove background noise and dark current.

Description

1. Technical field [0001] The invention relates to a device for detecting the position of an object, in particular to a device for detecting the position by using a modulated light beam and a detection method adopted by the device. 2. Background technology [0002] Free space optical communication technology (FSO) is a wireless communication method that realizes point-to-point communication through one-way or two-way transmission of laser beams. It has the speed of optical fiber communication and does not require a large initial investment in scarce resources such as spectrum. , so it has won people's favor, making it an important supplement for optical fiber communication and radio wave wireless communication. Its application fields involve backbone networks, access networks, and local area networks. It is also especially suitable for emergency communications, fast service provisioning, military security communications, and special-occasion communications. Its advantages ar...

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Application Information

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IPC IPC(8): H04B10/07
Inventor 许国良张旭苹王光辉黄金源刑建斌
Owner NANJING UNIV
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