A diffused optical tomography system based on square wave modulation
An imaging system and optical tomography technology, applied in the field of diffused optical tomography system, can solve the problems of low conversion efficiency, difficult integration, poor frequency accuracy and stability, and achieve simple structure, easy integration, and guaranteed stability. Effect
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Embodiment 1
[0063] See Figure 4 , Figure 4 It is a schematic diagram of a diffuse optical tomography system based on square wave modulation provided by an embodiment of the present invention. This embodiment provides a diffuse optical tomography system based on square wave modulation, and the diffuse optical tomography system includes:
[0064] A square wave generating unit is used to obtain a square wave according to a sine wave;
[0065] A light source driving unit, connected to the light source driving unit, for adding the square wave to the luminous light source, and driving the luminous light source to emit a light beam, and the light beam provided by the luminous light source is irradiated onto the object to be measured;
[0066] The detection unit is used to detect the electric signal generated by the light beam of the luminescent light source passing through the object to be measured.
[0067] That is to say, the square wave generation unit of this embodiment can obtain a squ...
Embodiment 2
[0077] In this embodiment, on the basis of the first embodiment, a diffuse optical tomography system in which the light source is an LED is described in detail.
[0078] See Figure 6 , Figure 6 It is a schematic diagram of another diffuse optical tomography system based on square wave modulation provided by an embodiment of the present invention. When the light source is an LED, the diffuse optical tomography system may also include a band-pass filter unit connected to the detection unit, and the band-pass filter unit is used to filter out harmonics in the second square wave and retain the second The fundamental wave in the square wave to get the filtered signal.
[0079] When the light source is an LED, the frequency of the modulation signal is, for example, 200Hz, and the signal detected by the SiPM is collected using a data acquisition card with a sampling frequency of 4KHz, and finally a square wave signal such as Figure 7 shown. The square wave is formed by the sup...
Embodiment 3
[0098] In this embodiment, on the basis of the first embodiment, the diffuse optical tomography system in which the light source is LD is described in detail.
[0099] See Figure 13 , Figure 13 It is a schematic diagram of another diffuse optical tomography system based on square wave modulation provided by an embodiment of the present invention. When the light source is an LED, the diffuse optical tomography system can also include an amplitude and phase value calculation module, and the amplitude and phase value calculation module is connected to the detection unit, that is, all silicon photomultiplier tubes are connected in parallel and then connected to the amplitude and phase value calculation modules, see Figure 14 , the magnitude and phase value calculation module includes a second left shift module, a second accumulation module, a second average value calculation module, a fourth fast Fourier transform module, a second magnitude calculation module and a phase valu...
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