Vehicle Mounted Large Loop Metal Detector | Godrej Security Solutions
VMDLD – Dual Coil Vehicle Mounted Large Loop Metal Detector: A Complete Guide
Introduction: Searching Faster, Searching Safer
The VMDLD turns a high-clearance four-wheel-drive vehicle into an all-terrain search platform for buried metallic threats. It was designed and built for search operations in the volatile areas of India, where security forces must clear roads, tracks and open ground before convoys and patrols move through.
Traditional route clearance relies on personnel walking ahead with hand-held detectors. That approach is slow, and it places searchers within metres of a possible device for hours at a time. Every extra minute spent on foot over a suspect stretch is a minute of direct exposure to the risk of explosion.
The VMDLD addresses both problems at once. By mounting a unique double large loop on a vehicle, it covers a wide swath of ground in a single pass and keeps the search team further removed from the buried object. In short, it makes searches for buried IEDs much faster and much safer.
In this guide we walk through what the VMDLD is, each of its key features, how it works, what it can and cannot detect, and where it delivers the most value.
What Is the VMDLD?
VMDLD stands for Dual Coil Vehicle Mounted Large Loop Metal Detector. It is a large-loop metal detection system fitted to a lightweight frame on the front of a vehicle, so the search loops sit ahead of the driver and sweep the ground as the vehicle advances.
The system is built around the Auror detection tool, which can be used either hand-held or vehicle-mounted. Auror is a support tool that helps operators locate metal objects buried at shallow depth. On the VMDLD, it is paired with two large search loops to cover far more ground per pass than any hand-held unit.
In the field, the VMDLD is shown mounted on a white police SUV: a tubular frame carries the loops across the full width of the vehicle, so the whole assembly travels with the vehicle as a single search unit.
At a glance
Item | Detail |
Full name | Dual Coil Vehicle Mounted Large Loop Metal Detector |
Detection core | Auror large-loop metal detector (hand-held or vehicle-mounted) |
Loop configuration | Unique double (dual-coil) large loop |
Carrier | High-clearance vehicle, preferably four-wheel drive |
Primary targets | Buried metallic IEDs and large buried metal objects |
Depth class | Shallow-buried objects; up to approx. 3 m for very large objects |
Intended users | Police, security forces, clearance and remediation teams |
Key Features Explained
Each feature of the VMDLD exists to solve a specific problem in route and area search. Here is what each one does and why it matters.
1. Unique double large loop (dual coil)
The heart of the system is its two large search loops. Detection capability in a large-loop detector scales with loop size, so bigger loops reach larger and deeper targets than a small hand-held search head.
Using two loops side by side widens the search swath. One pass of the vehicle covers ground that would take a foot team several sweeps, which directly shortens the time needed to clear a route.
2. Vehicle-mounted design
Mounting the loops on a vehicle removes the need for searchers to walk every metre of a suspect route. The vehicle carries the loops at a steady height and speed, giving consistent coverage that is hard to match on foot over long distances.
This design also reduces operator fatigue. Long hand-held search shifts are physically demanding, and fatigue is a known cause of missed targets.
3. High-clearance, four-wheel-drive platform
The VMDLD is intended for a high-clearance vehicle, preferably with four-wheel drive. Ground clearance lets the vehicle move over rough tracks, ruts and kerbs without damaging the loop frame.
Four-wheel drive keeps the vehicle moving on mud, sand, gravel and unmetalled roads, which are common in the areas where buried devices are most often placed.
4. All-terrain search capability
The combination of large loops and a capable 4x4 makes the VMDLD an all-terrain search tool. It can work on tarmac, dirt roads, verges and open ground, instead of being limited to prepared surfaces.
5. Faster search operations
A wide swath, steady vehicle speed and no need to stop for each footstep all add up to much faster searches. Faster clearance means routes reopen sooner and patrols spend less time halted in exposed positions.
6. Reduced personnel exposure
Safety is the most important benefit. Because the vehicle and its loops do the initial search, personnel spend far less time standing directly over ground that may hide a device. The VMDLD reduces the overall direct exposure of the team to the possibility of an explosion from a buried device.
7. Designed for the IED threats found in India
The VMDLD was developed specifically for the improvised containers commonly used in buried IEDs in India. These are typically large, metal-bodied objects such as:
Pressure cookers
Pipe bombs
Steel tiffins
Aluminium containers
Gas cylinders
Milk cans
All of these contain enough metal to fall well within the detection envelope of a large-loop system, which is why this approach is so effective against them.
8. Dual-role detection tool (Auror)
The Auror detector at the core of the VMDLD can be used hand-held or vehicle-mounted. This gives units flexibility: the vehicle covers long routes quickly, while the hand-held configuration can be used where vehicles cannot go or to confirm an indication.
9. Multi-sector applicability
Beyond counter-IED search, the same technology serves environmental remediation, battle area clearance, civil engineering and police work. One investment supports several mission types.
Working Principle: How Large-Loop Detection Works
The VMDLD finds metal objects whose size is roughly 0.5–1% of the search loop size or larger, buried at shallow depth. This simple rule explains why the loop is large and why the system is so well suited to bulky metallic targets.
The loop-size rule
A metal detector's search loop creates a field in the ground below it. Metal objects within that field disturb it, and the detector registers the disturbance as an indication. The larger the loop, the larger and deeper the field, and the bigger the object needed to produce a clear signal.
The catalogue states the practical relationship directly: the system locates objects of about 0.5–1% of the loop size or larger. A large loop therefore ignores much of the small scrap that slows hand-held searches, while responding strongly to substantial metal objects such as containers, cylinders and pipes.
What affects the detection range
The range at which an object is detected is not fixed. According to the catalogue, it depends on three things:
Object size – larger objects can be detected further away.
Object position – the orientation and placement of the object relative to the loop affect the signal.
Local interference – the degree of interference at the site changes how far the detector can reach.
For this reason, the published ranges are given for a non-interfered, favourable environment. Operators should expect shorter ranges where interference is higher.
Detection Performance
In favourable, non-interfered conditions, the VMDLD detects fist-sized metal objects at up to about 0.5 m and very large objects at up to about 3 m.
Target | Example | Approx. detection distance |
Fist-sized object | Mild steel, copper or brass items | Up to 0.5 m |
Very large object | A 250 kg MK82 aircraft bomb | Up to 3 m |
These figures are reference points from the catalogue, measured in a non-interfered, favourable environment. Real-world range will vary with the size and position of the object and the level of local interference.
The typical buried IED containers listed earlier, such as pressure cookers, gas cylinders and milk cans, sit between these two reference sizes. Their large metal bodies make them well suited to detection by a large-loop system.
Applications
The VMDLD serves any mission that needs fast, wide-area detection of large buried metal objects.
Counter-IED route search – clearing roads and tracks in volatile areas ahead of convoys, patrols and VIP movement.
Police work – searching suspected sites, vulnerable points and approach routes during security operations.
Post-conflict battle area clearance – locating large items of unexploded ordnance such as aircraft bombs left in former conflict zones.
Environmental remediation – surveying land for buried metal debris, drums and containers before it is cleaned up or reused.
Civil engineering – checking ground for large buried metal objects before excavation, trenching or construction.
General search – any task where a large area must be screened quickly for substantial metal objects.
Know the Limits: What the VMDLD Is Not Designed For
The VMDLD is not intended or suitable for detecting minimum amounts of metal, even when such items are buried close to the surface. This includes:
Minimum-metal mines
Nails
Short pieces of wire
This is a direct consequence of the loop-size rule. A large loop is tuned to respond to objects of about 0.5–1% of its size or larger, so very small metal items fall below its threshold.
Using the right tool for the right threat is essential. The VMDLD should be deployed as part of a layered search drill, with appropriate hand-held detectors and other search methods used wherever low-metal threats may be present.
Why Choose the VMDLD
Speed – a wide dual-loop swath clears routes far faster than foot search.
Safety – less time for personnel standing directly over potential devices.
Reach – large loops detect large objects at depths hand-held units cannot match, up to about 3 m for very large targets.
Mobility – a high-clearance 4x4 platform takes the search off-road and across rough terrain.
Relevance – designed around the container-type IEDs encountered in India.
Flexibility – the Auror detector works vehicle-mounted or hand-held, and supports police, clearance, remediation and engineering tasks.
Frequently Asked Questions
What does VMDLD stand for? Dual Coil Vehicle Mounted Large Loop Metal Detector.
What kind of vehicle does it need? A high-clearance vehicle, preferably with four-wheel drive, for all-terrain use.
What can it detect? Metal objects of roughly 0.5–1% of the loop size or larger, buried at shallow depth. This includes typical container IEDs such as pressure cookers, steel tiffins, gas cylinders and milk cans.
How deep can it detect? In favourable conditions, fist-sized metal objects at up to about 0.5 m and very large objects, such as a 250 kg MK82 bomb, at up to about 3 m.
Can it detect small items like nails or minimum-metal mines? No. The VMDLD is not designed for minimum amounts of metal, even near the surface. Use suitable hand-held detectors for those threats.
Can the detector be used without a vehicle? Yes. The Auror detection tool can be used hand-held as well as vehicle-mounted.
Conclusion
The VMDLD brings speed, reach and safety to one of the most dangerous tasks in security operations: finding buried IEDs. Its unique double large loop and all-terrain vehicle platform let search teams clear more ground in less time, while keeping personnel further from harm.
Contact us to arrange a demonstration, discuss vehicle integration for your fleet, or request a detailed quotation for the VMDLD.
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