Abstract: Disclosed in the present disclosure are a dual-motor coupling driving system and a control method therefor. The dual-motor coupling driving system comprises a driving apparatus and a transmission apparatus; the driving apparatus comprises a first motor and a second motor; the first motor and the second motor are coaxially arranged, and an output shaft of the first motor passes through the second motor; the transmission apparatus comprises a first input shaft, a second input shaft, a first gear pair, a second gear pair, a third gear pair, a fourth gear pair, a first clutch unit, a second clutch unit, a first intermediate shaft, a second intermediate shaft, and a system output shaft; the first motor is connected to the first input shaft; the second motor is connected to the second input shaft; the first clutch unit is fixed on the system output shaft; and the second clutch unit is fixed on the second intermediate shaft.

Abstract: A photoacoustic spectrum phase locking method, apparatus, and system are provided. The photoacoustic spectrum phase locking method includes: acquiring a mapping relationship between an output amplitude and an output phase of a photoacoustic spectrum system; determining a reference phase of the photoacoustic spectrum system according to the mapping relationship; and adjusting scanning parameters of a laser in the photoacoustic spectrum system according to the reference phase, so that an output phase in a current preset cycle of the photoacoustic spectrum system is equal to the reference phase.

Abstract: The present disclosure describes a fast-scanning optical-resolution photoacoustic (fsOR-PAE) endoscope for imaging vasculature within tissues in vivo that includes an ultrasonic transducer and a scanning mirror within a lumen of an elongate casing. The scanning mirror is configured to direct the laser pulses from the pulsed laser source to a focal spot outside the casing in a scanning pattern via an imaging window formed in the casing. The scanning mirror is further configured to direct a plurality of photoacoustic signals from the focal spot to the ultrasonic transducer via the imaging window.

Abstract: Apparatus and methods for measuring infrared absorption of a sample that includes delivering a pulse of infrared radiation to a region of the sample, delivering pulses of radiation of a shorter wavelength than infrared radiation to a sub-region within the region, and using one or more properties of the induced photoacoustic signals to create a signal indicative of infrared absorption of the sub-region of the sample.

Abstract: A pressing position and pressure measurement method based on PPG (photoplethysmographic) imaging, which only needs a camera to locate multiple pressing areas and measure corresponding pressure values without a pressure sensor. Before the measurement starts, only a simple calibration work is needed. With the gradual increase of the pressing pressure, the characteristics of PPG signals corresponding to diastolic pressure and systolic pressure will disappear one by one, and by recording two sets of pressure values and the corresponding PPG signal intensity values, the relation curve of the pressure versus blood perfusion changes can be fitted. Through this relation curve, the pressure values corresponding to different blood PPG signal intensities can be obtained. Different from the traditional technical route, the present disclosure provides a non-contact measurement method for determining the pressing location and measuring the pressure through a camera.

Abstract: The present disclosure describes a fast-scanning optical-resolution photoacoustic (fsOR-PAE) endoscope for imaging vasculature within tissues in vivo that includes an ultrasonic transducer and a scanning mirror within a lumen of an elongate casing. The scanning mirror is configured to direct the laser pulses from the pulsed laser source to a focal spot outside the casing in a scanning pattern via an imaging window formed in the casing. The scanning mirror is further configured to direct a plurality of photoacoustic signals from the focal spot to the ultrasonic transducer via the imaging window.

Abstract: In various aspects, a photoacoustic endoscopic probe and methods for measuring a hydration of a connective tissue in vivo using the photoacoustic endoscopic probe are disclosed.

Abstract: Apparatus and methods for measuring infrared absorption of a sample that includes delivering a pulse of infrared radiation to a region of the sample, delivering pulses of radiation of a shorter wavelength than infrared radiation to a sub-region within the region, and using one or more properties of the induced photoacoustic signals to create a signal indicative of infrared absorption of the sub-region of the sample.