1), there is a circuit on the network to get the high-band bandpass filtering effect with the high ratio of R3/Req. Due to the GBW parameters of the op amp, the center frequency of the actual circuit is less than the calculated value. 2), with resistance There is also a very complicated 50Hz notch circuit on the Internet. After repeated simulation analysis, I get a simple calculation formula for any frequency notch, fn=1/(2pC√R2R); fine-tuning resistor R2 makes the output and input waveform just right. Inverted, and then adjusted to 0 by R3, the best notch effect. According to the original circuit parameters, fn=1/[2p(0.1e-6)√(411e+3*2.4e+3)]=50Hz. If the capacitance is changed to C=2uf and the others are unchanged, then fn=1/[2p(2e-6)(√411*2.4)e+3]=2.5Hz. The GBW parameters of the op amp have little effect on the notch frequency, but have a low-pass filtering effect on the frequency signal higher than GBW. 3), with resistance to bandpass The above-mentioned band-stop circuit is a differential operation, and the time constant of the - terminal determines the frequency of the band pass of the circuit. When the fn frequency sine wave is input, R1: R3 = Re: Rf (where Re and Rf are equivalent resistances corresponding to the transmission frequency), The differential output is equal to 0 to achieve the notch of the fn frequency; when R3 An optical dome is a concentric window with two spheres. It can be understood as an optical window of a curved moon. Optical dome is used for deep-sea submersible, deep-sea equipment monitoring and underwater robot. At the same time, optical dome is widely used in meteorological industry. It can be used as an optical protective cover to protect the total radiation sensor, the sensor for solar total radiation observation, the net radiation sensor, the PTZ camera, and other precision instruments and equipment used in harsh environments.
Our company produces optical ball covers made of optical glass, fused quartz, silicon and other materials, and can produce optical hemispherical ball covers with a maximum diameter of 300mm. For an ideal optical spherical cover, the convex radius is equal to the sum of the thickness and concave radius. The thickness change at different points on the two surfaces is the main index to measure the accuracy of the spherical cover. Sometimes we call it the congruent thickness and concentricity of the optical spherical cover. For the optical ball cover with size less than 100mm, our concentricity can be controlled within 0.02mm.
Optical Dome Hanzhong Hengpu Photoelectric Technology Co.,Ltd , https://www.hplenses.com
