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Thread: Open Source Laser Power Meter

  1. #11
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    Quote Originally Posted by hakzaw1 View Post
    150w ??
    Yes, he really means 150 watts Len. I guess you missed his other thread where he was talking about re-gassing a bunch of CO2 lasers.

    150 watts might be high for a visible light laser, but it's nothing for a CO2 laser; depending on the model, they go into the KW. (Although for the sealed-tube, electrically-excited glass units he's working with, 150 watts is on the high end.)

    Back on topic: I'm curious about the estimated final cost of one of these meters...

    Adam

  2. #12
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    ... yes, 150 Watts for a CO2 laser is no problem -- I'm using single NIR laserdiodes with CW-powers of 30 Watts or "bundled" with up to 180 Watts (6x30W on a spot of 0.3mm diameter), what's too hard to measure at full powers with my actual power meter.

    Have some "Ulbricht-spheres" with a sensor inside and plans to replace the sensor for CW-powers of up to 1kW, what's the next "power-range" I'm assembling units for.

    Could be, next year I have to get somethig with more precise measuring in the range of 100 Watts to 3kW for welding tests with fiber- and CO2-lasers with 3kW and 5kW, what's not so easy with the commercial power-meters ... so too interested in a DIY-concept

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  3. #13
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    Default estimated cost

    Quote Originally Posted by buffo View Post
    Yes, he really means 150 watts Len. I guess you missed his other thread where he was talking about re-gassing a bunch of CO2 lasers.

    150 watts might be high for a visible light laser, but it's nothing for a CO2 laser; depending on the model, they go into the KW. (Although for the sealed-tube, electrically-excited glass units he's working with, 150 watts is on the high end.)

    Back on topic: I'm curious about the estimated final cost of one of these meters...

    Adam
    materials used
    1x pentiun 4 heatsink $10usd
    1x arduino nano $5usd
    1x arduino termocouple amplifier $5
    1x 2 line txt LCD $5usd

    many hours of investigation on calorimetry, plus many more on arduino programing language $$$$$

    im developing a new vesion using a TEC instead of termocouple to make readings more inmediate

    im intreted in features to code into this as it would be a $25 power meter and the most similar ones are 400 usd from china

    Ed.

  4. #14
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    Hi Ed;

    $25 is a lot less than I was expecting! Great work on your part.

    Adam

  5. #15
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    Sep 2018
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    How much do you expect?

  6. #16
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    Hungary
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    Guys,
    I had a DIY LPM.
    Carbonsoot absorbent on 8x8mm TEC element with a simple cold compensation electrical circuit and a specific calibration process.
    It worked great and accurate .
    Than i've bought a LaserBee AX(a month ago)
    Literally there was only 2-3% of difference when i've measured my lasers.
    Costs? Under 20€ and few hours of work. No arduino,no any hard to get part.
    6W full diode RGB
    2X 4W 462-520-638
    4W 520 nm
    Beyond 2X FB3
    ☼▬▬▬In Lasers We Trust▬▬▬☼

  7. #17
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    Quote Originally Posted by epyn View Post
    Than i've bought a LaserBee AX(a month ago)
    Literally there was only 2-3% of difference when i've measured my lasers.
    Costs? Under 20€ and few hours of work. No arduino,no any hard to get part.
    I agree that the Laserbee line of power meters are great for hobbyists. But they top out at 10 watts for the biggest version, and most of them are only good to 3 or 5 watts. That's normally enough for your average hobbyist, but if you have a CO2 laser or a high-powered YAG, you need something bigger.

    The meter Ed is talking about will go up to 150 watts. And for something that can accurately read power that high, a $25 price point is really impressive. I was expecting 3 figures, minimum.

    Adam

  8. #18
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    Oct 2012
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    Germany
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    Hi Adam,

    you can easily "tweak" a 5W sensor to measure powers up to some Kilowatts with expanded beam and aperture plates or better perforated grid sheets

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  9. #19
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    Jul 2018
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    24

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    Quote Originally Posted by buffo View Post
    I agree that the Laserbee line of power meters are great for hobbyists. But they top out at 10 watts for the biggest version, and most of them are only good to 3 or 5 watts. That's normally enough for your average hobbyist, but if you have a CO2 laser or a high-powered YAG, you need something bigger.

    The meter Ed is talking about will go up to 150 watts. And for something that can accurately read power that high, a $25 price point is really impressive. I was expecting 3 figures, minimum.

    Adam

    Ok, its going open source
    Please contribute back any improvements that you make
    code is fairly simple in this stage but works great


    // Digital Laser Power Meter
    // v 2.1


    #include <max6675.h>
    #include <LiquidCrystal.h>
    #include <Wire.h>


    //Max6675 CK,CS,SO
    MAX6675 thermocouple(4, 3, 2);
    int sense = 0;
    float cal = 0.0000;
    int t = 10;
    int tiempo = t;
    float p = 0.717;
    int m = 87;
    int maxt = 45;
    float temperatura = 0.000;
    float temperaturai = 0.000;
    float temperaturaf = 0.000;
    float temperaturaa = 0.000;
    float w = 0.000;
    //establecer conexiones LCD 16x2
    // RS, E, D4, D5, D6, D7
    LiquidCrystal lcd(8, 9, 10, 11, 12, 13);


    void setup() {
    Serial.begin(9600);
    // use Arduino pins FORMAX6675 VCC AND GND
    pinMode(5, OUTPUT); digitalWrite(5, HIGH);
    pinMode(6, OUTPUT); digitalWrite(6, LOW);
    pinMode(7, OUTPUT); digitalWrite(7, HIGH);
    lcd.begin(16, 2);
    sense = analogRead(A7);
    cal = sense * (2.0 / 1023.0);
    p = cal;
    // wait for MAX chip to stabilize
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print ("Medidor Potencia");
    lcd.setCursor(0, 1);
    lcd.print (" Laser Co2");
    delay(2500);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print (" V 2.0 ");
    lcd.setCursor(0, 1);
    lcd.print ("521 229-419-3262");
    delay(5000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print ("Cal P = ");
    lcd.print (p);
    delay (2500);
    }


    void loop()
    {


    //esperar temperqatura menor a tmax
    temperatura = thermocouple.readCelsius();

    while (thermocouple.readCelsius() > maxt)
    {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print (" Temperatura de ");
    lcd.setCursor(0, 1);
    lcd.print (" sensor alta");
    delay(2000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print ("Porfavor Espere");
    lcd.setCursor(0, 1);
    lcd.print (" T = ");
    lcd.print (thermocouple.readCelsius());
    lcd.print (" C");
    delay(2000);
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(" Medir Potencia ");
    lcd.setCursor(0, 2);
    lcd.print(" Encender Laser ");
    // guardar temperatura inicial
    temperaturai = thermocouple.readCelsius();
    digitalWrite(7, LOW);
    //Serial.print ("Temperatura Inicial ");
    //Serial.println (temperaturai);
    //Serial.println ("Espera de laser");
    delay (180);

    do
    {
    temperatura = thermocouple.readCelsius();
    //Serial.println(temperatura);
    delay (180);
    //esperar a una diferencia de un grado de temperatura

    if (temperatura < temperaturai)
    {
    temperaturai = temperatura;
    }
    } while (temperatura-temperaturai < 1);

    //Serial.println("Lecturas");
    //esperar T segundos para absorber energia
    do
    {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("ESPERE ");
    lcd.print(tiempo);
    lcd.print("Seg");
    tiempo=tiempo - 1;
    //Serial.println(thermocouple.readCelsius());
    delay (1000);
    } while (tiempo > 0);
    //Serial.println("Esperando Maximo");
    digitalWrite(7, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("PROCESANDO");
    temperaturaf = thermocouple.readCelsius();
    delay(180);

    do
    {
    temperatura = thermocouple.readCelsius();

    //Serial.print (temperaturaf);
    //Serial.print (" - ");
    //Serial.println (temperatura);
    delay(200);
    if (temperaturaf < temperatura)
    {
    temperaturaf = temperatura;
    }
    }while ((temperaturaf - temperatura) < 0.75);




    w =((((m*(temperaturaf - temperaturai))*(4.18)*(p))/30));
    //w = (((m*(deltat))/1000)*4180)/(t);
    //Serial.println("calculo");
    //Serial.println(temperaturai);
    //Serial.println(temperaturaf);
    //Serial.print("Watts: ");
    //Serial.println(w);




    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print ("POTENCIA LASER");
    lcd.setCursor (0, 2);
    lcd.print(w);
    lcd.print(" Watts");


    delay(10000);
    tiempo = t;
    digitalWrite(7, HIGH);
    }

  10. #20
    Join Date
    Dec 2008
    Location
    Canada
    Posts
    972

    Default

    Quote Originally Posted by sinfocomp View Post
    so far i was able to measure 10 watt laser acurately +- 5%
    and 15 to 100watt + - 2%
    resolution is .01 watt
    sensing element is anodized aluminum and carbon black coating
    convection cooled, might go higher power with forced air cooling
    but my most powerfull laser is 150 watt
    I see that you are using a Type 'K' Thermocouple for the power
    sensing element.
    For $25.00 I'll take one of your LPMs for testing right now...
    You can PM me and let me know where to send the PP payment.

    What is the 100% response time at 1 Watt ??

    Jerry
    Last edited by lasersbee; 09-29-2018 at 15:19. Reason: Spelling Errors
    See the LaserBee II and all other LaserBee LPM products here....
    All LaserBee Laser Power Meter Products

    New 3.2Watt RS232/USB LaserBee II LPM REVIEW


    Always in stock and ready to ship....
    Subsidary:-Pharma Electronic Solutions

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