A test system and method for the effect of beam shaping on light-induced hearing

Abstract

The invention discloses a system and method for testing influences of beam shaping on light induced auditory sense. The system comprises an excitation signal source, a light source and driving module, a transmission optical fiber and a mode switching module, wherein the excitation signal source, the light source and driving module, the transmission optical fiber and the mode switching module are connected in sequence; the mode switching module transmits an optical signal transmitted by the optical fiber to a beam gathering and shaping module or a beam diverging module, and switching between divergent beams and gathered beams is achieved; output optical irradiation of the beam gathering and shaping module or the beam diverging module is used for an animal auditory sense testing module for testing auditory sense responses, corresponding to different voices, of animal auditory sense tissue under the divergent beams and the gathered beams, the animal auditory sense testing module transmits measured data to a data processing module, and the data processing module is in charge of processing collected auditory sense response signals to obtain differences between optical signal parameters of the auditory sense responses induced by the divergent beams and optical signal parameters of the auditory sense responses induced by the gathered beams. The testing system and method are used for light induced auditory sense system researches and can be used for testing or calibrating changes brought by shaped beams to system signal parameters.

Description

technical field [0001] The invention discloses a test system and method for the influence of beam shaping on light-induced hearing. Background technique [0002] Studies in recent years have shown that light pulses instead of electrical pulses can stimulate the conduction function of animal auditory nerves, and have the potential to be used in cochlear implants to restore hearing. The photoacoustic effect can be produced by irradiating the cochlear auditory nerve tissue with fiber pulse laser, which can be observed by measuring the animal auditory brainstem response (ABR) to observe the laser triggering the auditory nerve response. From such research literature reports, it can be seen that lasers of various wavelengths have successfully induced hearing, such as 808nm, 980nm, 1850nm, etc. At the same time, some people have studied the effects of changes in other laser parameters (such as pulse width, pulse repetition rate, etc.) on light stimulation-induced hearing. Impact. ...

AI Technical Summary

Problems solved by technology

[0004] 1. The larger the laser divergence angle leads to the divergence of laser energy, the expansion of the laser action area, the decrease of the accuracy of light stimulation, and the inability to determine the precise stimulation site

[0005] 2. Under the same conditions, a larger energy laser power is required to induce the auditory phenomenon, which is not conducive to the miniaturization of the laser light source and laser modulation drive circuit structure

[0006] 3. The distance and angle of the bare fiber port are highly related to the light-induced auditory effect, and it is not easy to control precisely

[0007] 4. The bare fiber port is easily polluted by the liquid of the auditory tissue, which is easy to cause blockage and hinder the output of light. When the blockage is serious, the fiber port will be damaged

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