Монохроматорите се използват в оптиката за изолиране на определени дължини на вълните от източник на светлина, съставен от много дължини на вълните. [1] Монохроматорите на пазара са между $2000 и $10 000. Нашият монохроматор се произвежда за по-малко от $100.
Съдържание
Цели на проекта
Целта на този проект беше да се създаде лесен за 3D отпечатване и сглобяване монохроматор, който все още е относително точен.
Дизайн
- Части за монохроматор
Инструкции за механично сглобяване
- Purchase mirrors, bolts, nuts, razor blades, stepper motor, and associated electronics
- Print files from NIH site http://3dprint.nih.gov/discover/3dpx-002158
- Epoxy mirrors into printed mirror holders and leave until dry
- Cut 1" by 1" square from edge of DVD-R and epoxy to mirror holder face
- Epoxy 16mm M3 bolt onto end of stepper motor
- Push M3 nuts into pockets on back of front wall
- Bolt razor blades onto wall with sharp edge pointed into center of wall
- Bolt stepper motor to wall using 4 bolts, with 2 washers under each bolt
- Bolt wall to base with 2 M3 bolts
- Push first mirror holder into square slot on base pointed toward front wall and insert bolt from underneath to secure, repeat with second mirror holder
- Push M3 nut into pin for diffraction grating mount
- Place pin into arms on diffraction grating mount
- Place diffraction grating mount into hole on base plate
- Rotate pin so that the nut side is closest to the stepper motor and rotate the motor by hand to start the bolt into the nut
- Place assembly into cardboard box, mark out holes for motor and slots
- Remove assembly, cut out holes, place assembly back in box
- Tape assembly to bottom and front of box being careful to not cover inlet and outlet slots with tape
- Proceed to electrical setup section
Electrical Assembly Instructions / Software
- Program Arduino according to the code below:
#include <Stepper.h>
const int stepsPerRevolution = 200; // change this to fit the number of steps per revolution// for your motor
// initialize the stepper library on pins 8 through 11://Stepper myStepper(stepsPerRevolution, 4, 5);
int stepCount = 0; // number of steps the motor has taken
void setup() {pinMode(6,OUTPUT); // EnablepinMode(5,OUTPUT); // SteppinMode(4,OUTPUT); // Dir
// initialize the serial port:Serial.begin(9600);}
void loop() {// step one step:Serial.println("Please Enter Step Value (-50 to 50): ");while (Serial.available() == 0);int val = Serial.parseInt(); //read int or parseFloat for ..float...if(abs(val) > 50) {Serial.println("ERROR: Too High of Input Value.");goto failed;}if(val < 0) {digitalWrite(4,HIGH); // Set Dir high}else {digitalWrite(4,LOW); // Set Dir low}for(int i = 0; i < abs(val); i++) {digitalWrite(5,HIGH); // Output highdelayMicroseconds(500); // Wait 1/2 a msdigitalWrite(5,LOW); // Output lowdelayMicroseconds(500); // Wait 1/2 a ms}Serial.print("Moved ");Serial.print(val);Serial.println(" Steps.");stepCount++;failed:;//delay(500);}
Calibration
- Due to the many types of mirrors and DVDs available calibration is recommended
- Acquire a white light source and spectrometer
- Move the mirror to the maximum and minimum travel and record the prevalent wavelength
- Take additional points if necessary at known number of stepper motor rotations
- Use either a best fit linear line or polynomial to calculate wavelength output vs stepper motor rotations
Costs
Item | Quantity | Approximate Cost |
---|---|---|
Plastic | 163 g at 25% fill | $3.75 |
50 mm dia, 100 mm focal length Concave Mirrors | 2 | $10 |
Razor Blades | 2 | $1 |
NEMA 17 Stepper Motor | 1 | $20 |
M3x0.5 10 mm bolts | 8 | $4 |
M3x0.5 nuts | 3 | $2 |
Arduino | 1 | $20 |
Stepper Motor Driver | 1 | $20 |
Breadboard | 1 | $8 |
Discussion
Current Issues
- Diffraction mount will not actually rotate in current configuration
- Настройката е твърде тежка от страната на двигателя
- Моторът също е на пътя на светлинните отвори
Възможни решения
- За всички проблеми по-горе преместете двигателя отдолу и насочете монтажа към дифракционния монтаж
Препратки
- ↑ Монохроматор Уикипедия [1]
- ↑ http://fritzing.org/projects/a4988-single-stepper-test/
Данни за контакт