| 摘要 |
PROBLEM TO BE SOLVED: To provide a long measurable distance by a device for generating an accurate sampling clock in an SS-OCT, and to eliminate a ghost appearing in an OCT image because the accuracy of a sampling clock is bad.SOLUTION: The sampling clock generation device generates a sine wave as a sampling clock, and uses a low frequency noise reduction filter in order to eliminate low frequency noise in a clock signal. Such a low frequency noise reduction filter is used, which makes the maximum value of a spectral intensity of noise after transmitting the low frequency noise reduction filter to be about 60% or below of the spectral intensity of the signal. In addition, a frequency scanning light source is used, wherein noise to be spectral intensity of about 60% or more of the spectral intensity of the signal is closer to a low frequency side than to a frequency band of the signal in an intensity spectrum of a sampling clock before using a high pass filter, and the frequency band of the signal is separate from a frequency band of the noise by about 5 MHz or more. |
