A pulse lie detection method and device based on linear frequency modulation

A linear frequency modulation and pulse technology, which is used in psychological devices, pulse/heart rate measurement, diagnostic recording/measurement, etc., can solve the problems that the sensor and the wrist fit layer have a great influence on the results, the calculation process is complicated, and the accuracy is not high. , to achieve the effect of fewer probes, simple device and high accuracy

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The core is to sense the patient's pulse information through the pressure sensor fixed on the hand, and use the temperature sensor to calibrate the error of the pressure sensor. However, it still has some shortcomings of the tactile sensor, such as: low precision; the sensor and the wrist bonding layer Accuracy has a great influence on the results, and it is necessary to use high-precision, high-cost air pumps and hydraulic devices to reduce errors
[0005] Ultrasound has been used to collect pulse data for a long time because of its safety and non-destructive characteristics. For example: Chinese patent, application number: 200610083339.8, with the help of medical array ultrasonic three-dimensional imaging equipment, various parameters of pulse are obtained by obtaining three-dimensional graphics of pulse; but this method The pulse signal is used as the detection signal. The pulse signal is generally used for imaging, and it needs to be used in combination with an array probe, and the calculation process is complicated.

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  • A pulse lie detection method and device based on linear frequency modulation
  • A pulse lie detection method and device based on linear frequency modulation
  • A pulse lie detection method and device based on linear frequency modulation

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Embodiment

[0079] Polygraph detection technology can quickly eliminate a large number of innocent suspects and screen out key suspects through a series of physiological changes that occur when people lie. The interrogation and investigation of the target can get twice the result with half the effort and greatly improve the efficiency of solving the case.

[0080] Physiological changes during lying are manifested in abnormal breathing rate and blood volume, respiratory depression and breath holding; faster pulse, increased blood pressure, increased blood output and changes in composition, resulting in obvious pale or reddened skin on the face and neck. Therefore, the multi-dimensional detection of the pulse can provide a more comprehensive reference for the judgment of the polygraph results.

[0081] In view of this, this embodiment proposes a pulse lie detection method based on chirp. Based on the physical characteristics of ultrasound, a non-array ultrasonic probe is used to transmit l...

Embodiment 2

[0135] This embodiment proposes a pulse polygraph device based on linear frequency modulation, which organically combines technologies such as acoustic detection, power electronics, and signal processing, and has the characteristics of small size and low cost. And according to the physical characteristics of ultrasound, a non-array ultrasound probe is used to transmit linear frequency-modulated continuous signals, and a combination of pre-distortion processing, pulse compression, and layered inversion echo algorithms are used in signal processing methods to finally obtain the depth and frequency of the pulse. , amplitude and organizational state. Combine below Figure 1-Figure 4 The device is described in further detail.

[0136] In this embodiment, the structure of the pulse polygraph device based on linear frequency modulation is as follows: figure 2 As shown, it consists of two parts, the data collection terminal 101 and the data processing terminal 102, and the two part...

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Abstract

The invention discloses a pulse lie detection method and device based on linear frequency modulation. The sensor adopts a non-array ultrasonic probe to transmit continuous linear frequency modulation signals. The linear frequency modulation signals have the advantages of accuracy, anti-multipath and anti-artifact. Combined with pre-distortion processing, pulse compression, and layered inversion echo algorithm, the position (depth) of each reflection surface can be obtained through the time delay between each reflection echo; using the attenuation function of ultrasound in the body, iteratively Perform the amplitude of the emission signal and echo signal in each reflection layer, and calculate the reflection coefficient of each reflection surface; the reflection coefficient can determine the tissue composition of each reflection layer, and obtain the depth, frequency, amplitude and other dimensions of the pulse pulse information, which can provide more dimensional reference for the judgment of polygraph results.

Description

technical field [0001] The invention relates to the technical fields of acoustic detection, signal processing and the like, in particular to a pulse lie detection method and device based on linear frequency modulation. Background technique [0002] Polygraph technology is a criminal psychological test technology. In the early stage of investigation, investigators found the suspect according to the situation of preliminary investigation and investigation, but there is no conclusive evidence to determine whether the object is a criminal. method, conduct a positive review to rule out or affirm criminal suspicion. But both the perpetrator and the innocent will try their best to defend and deny the crime. Some of their confessions are difficult to verify for a while, or even though they can be verified, it takes a lot of time and money. At this time, if polygraph technology is used, a large number of innocent suspects can be quickly eliminated, key suspects can be screened out, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/16A61B8/02
CPCA61B5/164A61B8/02A61B8/4444A61B8/52
Inventor 马碧云元达鹏刘娇蛟
Owner SOUTH CHINA UNIV OF TECH
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