Gold detector koi jaadu ki machine nahi hai — yeh physics ke ek seedhe niyam par kaam karta hai. Jab badalta hua magnetic field kisi metal ke paas aata hai, to us metal mein chhoti electric currents (eddy currents) ban jaati hain. Yeh currents apna khud ka chhota magnetic field banati hain, jise detector ka coil pakad leta hai. Bas, yahi “beep” ka raaz hai.
Metal detector ke mukhya hisse
- Search coil: neeche wala gol ya oval hissa. Isme transmit aur receive coils hote hain.
- Control box: electronics, jo signal banata, padhta aur samajhta hai.
- Shaft: coil aur control box ko jodta hai.
- Speaker / headphones: target milne par awaaz deta hai.
VLF technology kaise kaam karti hai
VLF (Very Low Frequency) detector mein do coil hote hain. Ek coil lagatar ek fixed frequency par magnetic field banata hai. Jab koi metal paas aata hai, to receive coil mein signal aata hai — aur us signal ka “phase” thoda shift hota hai. Har metal ka phase shift alag hota hai. Isi se machine batati hai ki target iron hai, aluminium hai, ya sona-chandi jaisa non-ferrous metal.
Frequency ka role: high frequency (jaise 15 kHz se upar) chhote gold nuggets aur patle gehno par zyada sensitive hoti hai. Low frequency badi chandi aur taambe ki cheezon ke liye aur gehrai ke liye behtar hoti hai. Isliye “gold detector” kehlane wali VLF machines aksar high frequency par chalti hain.
Fayde: achha discrimination (kachra aur iron ignore kar sakte hain), halki, kam battery.
Kami: bahut mineralized zameen mein gehrai kam ho jaati hai aur false signals badh jaate hain.
Pulse Induction (PI) technology kaise kaam karti hai
PI detector coil mein bahut chhote, tez current pulse bhejta hai — ek second mein sainkdon baar. Har pulse ke band hone par metal mein bani currents dheere-dheere khatam hoti hain. Machine is “decay” ko naapti hai. Metal hone par decay lamba hota hai, aur machine signal deti hai.
Zameen ke minerals ka signal bahut jaldi khatam ho jaata hai, isliye PI machine unhe kaafi had tak ignore kar sakti hai. Yahi wajah hai ki Rajasthan, Gujarat, Karnataka jaisi mineralized zameen par PI machines zyada bharosemand rehti hain.
Fayde: mineralized zameen par stable gehrai, bade coil ke saath gehri search.
Kami: discrimination kamzor (iron ke kachre par bhi beep karti hai), zyada battery, aam taur par mehngi.
VLF vs PI — ek nazar mein
| Feature | VLF | Pulse Induction |
|---|---|---|
| Mineralized zameen | Mushkil | Behtar |
| Iron/kachra pehchaan | Achhi | Kamzor |
| Chhote gold nugget | High frequency par achha | Coil aur setting par depend |
| Gehre bade targets | Seemit | Behtar |
| Wazan aur battery | Halki, kam battery | Thodi bhaari, zyada battery |
Gehrai kin cheezon par depend karti hai?
- Target ka size: bada object zyada gehrai par milta hai. Ek chhota sikka aur ek bada bartan alag-alag gehrai par milenge.
- Coil ka size: bada coil gehra jaata hai, lekin chhote targets miss kar sakta hai.
- Metal ka type: chandi aur taamba acche conductor hain; patla sona kam signal deta hai.
- Zameen: namak, iron minerals aur geeli mitti gehrai par asar daalte hain.
- Kitne samay se dabbi hai: kai detectorists maante hain ki lambe samay se dabbi cheez ke aas-paas ki mitti mein corrosion ka “halo” signal ko thoda badha deta hai, khaas kar taambe aur lohe mein.
To aapke liye kaunsa gold detector?
Agar aap gehne, sikke aur saaf zameen par search karte hain to achhi VLF machine kaafi hai. Agar zameen laal, kaali ya retili hai, ya aap gehre objects dhoondhna chahte hain, to Pulse Induction behtar rahega. Price ki poori samajh ke liye padhein: Metal detector price in India.
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