Thesawtooth wave(orsaw wave) is a kind ofnon-sinusoidal waveform. It is so named based on its resemblance to the teeth of a plain-toothedsawwith a zerorake angle. A single sawtooth, or an intermittently triggered sawtooth, is called a ramp waveform. The convention is that a sawtooth wave ramps upward and then sharply drops. In a reverse (or inverse) sawtooth wave, the wave ramps downward and then sharply rises. It can also be considered the extreme case of an asymmetrictriangle wave.
그 주기에 맞춰 레이저의 강도가 달라지는지 PD에 의해 측정된 전압이 입력된 전류와 같이 변조된다.
Channel 2 (blue trace) in Figure 1 shows the photodetector output of a laser being modulated from 100 to 150mA at 1kHz. Channel 1 is the input modulation signal. The LDC-3724B is operating in low bandwidth (CW) mode and 200mA range with a CW setpoint of 100mA.
$ lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M |__ Port 5: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M |__ Port 6: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 6: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 10: Dev 5, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 10: Dev 5, If 1, Class=Wireless, Driver=btusb, 12M
$ lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M |__ Port 3: Dev 8, If 4, Class=Human Interface Device, Driver=usbhid, 480M |__ Port 3: Dev 8, If 2, Class=Audio, Driver=snd-usb-audio, 480M |__ Port 3: Dev 8, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 3: Dev 8, If 3, Class=Audio, Driver=snd-usb-audio, 480M |__ Port 3: Dev 8, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 5: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M |__ Port 6: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 6: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 10: Dev 5, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 10: Dev 5, If 1, Class=Wireless, Driver=btusb, 12M
그냥 UVC 카메라로 인식
$ dmesg [423662.451242] usb 1-3: new high-speed USB device number 8 using xhci_hcd [423662.603464] usb 1-3: New USB device found, idVendor=534d, idProduct=2109, bcdDevice=21.00 [423662.603470] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [423662.603473] usb 1-3: Product: USB Video [423662.603475] usb 1-3: Manufacturer: MACROSILICON [423662.604969] uvcvideo: Found UVC 1.00 device USB Video (534d:2109) [423662.608325] hid-generic 0003:534D:2109.0008: hiddev0,hidraw3: USB HID v1.10 Device [MACROSILICON USB Video] on usb-0000:00:14.0-3/input4 [423684.653377] usb 1-3: USB disconnect, device number 8 [423695.325889] usb 1-3: new high-speed USB device number 9 using xhci_hcd [423695.479263] usb 1-3: New USB device found, idVendor=534d, idProduct=2109, bcdDevice=21.00 [423695.479268] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [423695.479272] usb 1-3: Product: USB Video [423695.479274] usb 1-3: Manufacturer: MACROSILICON [423695.480799] uvcvideo: Found UVC 1.00 device USB Video (534d:2109) [423695.484245] hid-generic 0003:534D:2109.0009: hiddev0,hidraw3: USB HID v1.10 Device [MACROSILICON USB Video] on usb-0000:00:14.0-3/input4