Photoacoustic Doppler blood flow velocity and blood oxygen content measuring system and measuring method
A technology of blood oxygen content and measurement system, which is applied in the field of flow velocity measurement, can solve the problems that the blood flow velocity cannot be measured accurately, and achieves the effects of high detection bandwidth, wide range of measurable flow velocity, and large measurable depth
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0046] like figure 1 As shown, the present invention discloses a photoacoustic Doppler blood flow velocity and blood oxygen content measurement system, including:
[0047] A pulse light filtering and collimating unit for filtering and collimating to obtain collimated laser light;
[0048] The pulsed laser amplitude modulation unit of the Glan prism and 1 / 4 wave plate used to modulate the amplitude of the collimated laser with the polarization directions perpendicular to each other;
[0049] A sample unit for placing a blood vessel sample;
[0050] A collection and amplification unit for collecting and amplifying the pulsed laser acoustic wave signal generated by irradiating through the sample unit;
[0051] A signal demodulation unit for demodulating the amplified photoacoustic signal and the reference signal;
[0052] Spectrum analysis unit for processing Doppler analysis on the signals obtained by the collection amplification unit and signal demodulation unit to obtain th...
Embodiment 2
[0054] like figure 2 As shown, the present invention discloses a photoacoustic Doppler blood flow velocity and blood oxygen content measurement system, wherein each component unit is introduced as follows:
[0055] The pulse light filtering and collimating unit includes a supercontinuum laser 1, a filter 2 and a coupling collimating lens 4. The pulsed laser light generated by the supercontinuum laser 1 is transmitted to the coupling collimating lens 4 through the filter 2 and single-mode fiber 3 in sequence. After coupling and collimation, a collimated laser is obtained. The filter 2 screens the pulse laser generated by the supercontinuum laser 1 to form a 532nm, 20MHz repetition frequency pulse laser.
[0056] The pulsed laser amplitude modulation unit includes a horizontal polarizing Glan prism 5, a 1 / 4 wave plate 6 whose polarization direction is 45 degrees to the direction of the horizontal polarizing Glan prism 5, an electro-optic crystal 7 and a vertical polarizing Gla...
Embodiment 3
[0063] Another object of the present invention is to protect the measurement method using the above photoacoustic Doppler blood flow velocity and blood oxygen content measurement system.
[0064] In the present invention, the supercontinuum laser is applied to the photoacoustic Doppler blood flow velocity measurement, and the sine wave intensity modulation is performed on the pulsed laser at a frequency of 1 MHz. At present, the modulated laser is used to directly irradiate the flow in the transparent hose. The photoacoustic signal generated by the particles is relatively strong, and then the ultrasonic transducer, preamplifier, and lock-in amplifier are used to collect, amplify, demodulate, and process the signal to form a set of flow velocity measurement with high accuracy, a wide range of measurable flow velocity, and a measurable A photoacoustic Doppler blood flow velocity measurement system with large depth, small spectral broadening, high spectral resolution, wide wavelen...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com