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Digital signal processing method for sense signal of focal plane detector

A technology of digital signal processing and focal plane detector, which is applied in radiation pyrometry, instruments, measuring devices, etc., and can solve problems such as increased shot noise, increased noise content of readout signals, and increased circuit area.

Inactive Publication Date: 2011-02-09
NANTONG UNIVERSITY
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Problems solved by technology

Such as: correlated four-sampling, differential averaging method, double reset method, etc., but this method of using circuits to reduce noise actually has some defects: first, the area of ​​the circuit will increase, and the power consumption will increase. The application on the device will have the limitation of power consumption and area; second, the increase in the number of components in the circuit will increase more noise, which will increase the noise of the readout signal without using other methods of noise reduction content
However, this formula is only valid in the middle and low frequency range, and in the high frequency region, the shot noise will also increase with the increase of frequency

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  • Digital signal processing method for sense signal of focal plane detector
  • Digital signal processing method for sense signal of focal plane detector
  • Digital signal processing method for sense signal of focal plane detector

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with drawings and embodiments.

[0051] The present invention as figure 1 Shown is the digital signal processing module in the whole detector system. A relatively weak current signal is generated by the sensor; then through the amplification of the readout circuit, it is converted into a voltage signal that can be observed in the later stage; then the noise in the signal is removed through the digital signal processing module; finally through a series of Convert to form the desired waveform or graphic output display.

[0052] The algorithm structure of the digital signal processing module is as follows: figure 2 As shown, the noisy signal x(t) output by the readout circuit is decomposed by the first layer of wavelet to obtain two sets of data of low-frequency ca1 and high-frequency cd1, and then decompose ca1 to obtain ca2 and cd2 by the same method. By analogy, a total of 7 decompositions are done...

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Abstract

The invention discloses a method for denoising a sense signal of a focal plane, which comprises the following steps of: performing wavelet decomposition on the sense signal according to the composition and characteristics of noise in the sense signal of a focal plane detector, decomposing the sense signal of the detector into frequency bands with different energies by the wavelet decomposition, and processing coefficients obtained by decomposing each layer by adopting corresponding threshold values according to the characteristics of the noise in the signal to fulfill the aim of attenuating noise energy.

Description

technical field [0001] The invention relates to a digital signal processing method, in particular to a digital signal processing method for a focal plane detector readout signal. Background technique [0002] The traditional focal plane detector readout circuit is mainly an ordinary amplifier structure. Such as: source follower structure, direct injection structure, etc. These ordinary amplifier structures can only amplify the signal, not only cannot denoise the signal, but also bring more noise from electronic devices. [0003] Therefore, in order to solve the above-mentioned problem that ordinary amplifiers cannot reduce noise, people have designed capacitive transimpedance amplifiers with preliminary noise removal functions, etc., and added a correlated double sampling structure behind the amplifier. This structure removes the KTC noise in the signal through the differential structure of correlated double sampling, and also removes some 1 / f noise. However, due to the a...

Claims

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Application Information

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IPC IPC(8): G01J5/02
Inventor 景为平殷晓敏丁俊民顾勇鲁华祥李言谨
Owner NANTONG UNIVERSITY
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