How a Mumbai start-up cracked missile cooling tech
A Mumbai-based deep-tech start-up has developed indigenous cooling technology used in missile systems, built around a lean manufacturing approach
The technology addresses cryogenic cooling requirements for infrared (IR) seeker and sensor components used in guided missile platforms
The development is being positioned as opening a high-value defence export opportunity for the company
It adds to a growing base of Indian private-sector suppliers of critical, high-precision sub-systems for defence platforms rather than only complete weapon systems
Infrared Seeker Cooling — Why Missiles Need Cryogenic Cooling
Infrared-guided (heat-seeking) missiles use a focal plane array detector that senses the infrared radiation emitted by a target. These detectors only achieve the sensitivity needed for precise target discrimination when cooled to cryogenic temperatures, making the cooling sub-system a critical, high-precision component of the missile's guidance package.
Key Details
- The two dominant cooling technologies are Joule-Thomson (JT) cryocoolers, which cool high-pressure gas (typically argon or nitrogen) rapidly through an expansion valve, and Stirling cryocoolers, which use a closed thermodynamic cycle for sustained cooling
- JT cryocoolers are valued for very fast cool-down (seconds), compact size, and mechanical simplicity, making them preferred for missile seekers that must lock onto a target quickly after launch
- The detector must be held within a narrow temperature band (often close to 77 K, the boiling point of liquid nitrogen) for consistent target acquisition
- India's guided-missile programmes — including the Akash, Astra, and various man-portable and shoulder-fired systems — rely on such cooled IR seekers or cooled sensor variants
The start-up's cooling technology addresses this precise sub-system requirement, indicating India is building indigenous capability in a critical-technology component that was historically import-dependent.
Defence Indigenisation Ecosystem — iDEX and Private-Sector Participation
India's defence-innovation ecosystem has increasingly relied on start-ups and MSMEs, not just public-sector defence firms, to develop critical sub-systems — a shift formalised through dedicated government schemes.
Key Details
- Innovations for Defence Excellence (iDEX) was launched in April 2018 under the Department of Defence Production, implemented through the Defence Innovation Organisation (DIO), a Section 8 company backed by Hindustan Aeronautics Limited (HAL) and Bharat Electronics Limited (BEL)
- iDEX runs structured challenges — including the Defence India Start-up Challenge (DISC) — inviting start-ups to solve specific problem statements posed by the armed forces and defence PSUs
- The broader indigenisation push also includes "Positive Indigenisation Lists" issued under the Department of Military Affairs, which bar the import of listed components/platforms beyond a notified timeline, and the Defence Acquisition Procedure (DAP) 2020, which created dedicated "Make" categories for indigenous design and development
- Private industry's share of India's total defence production has been rising, alongside record growth in defence exports over the past decade
A private Mumbai start-up cracking a niche, high-precision defence technology reflects this broader policy shift toward decentralised, private-led innovation in critical defence sub-systems rather than reliance on a small set of public-sector integrators.
India's Defence Exports Trajectory
Defence exports are a specific focus of India's "Atmanirbhar Bharat" (self-reliance) push in defence manufacturing, with sub-systems and components increasingly featuring alongside complete platforms in the export basket.
Key Details
- India's defence exports reached a record high in FY 2025-26, continuing a sustained multi-year rise from a low base in the early 2010s
- The government's stated ambition is to substantially scale annual defence production and exports by the end of the decade, as set out in the Defence Production and Export Promotion Policy (DPEPP) framework
- Exports now span platforms, ammunition, and precision sub-systems/components — the category into which cooling and sensor technologies for guided munitions fall
- Growth has been driven by both public-sector undertakings and a rising share of private industry, including start-ups incubated through iDEX-linked programmes
The start-up's cooling technology is described as opening a "high-value defence export market," consistent with the pattern of Indian private firms increasingly exporting specialised sub-systems rather than only finished defence platforms.
- iDEX launched: April 2018, implemented via the Defence Innovation Organisation (DIO)
- DIO backed by: Hindustan Aeronautics Limited (HAL) and Bharat Electronics Limited (BEL)
- Typical IR detector operating cooling technologies: Joule-Thomson (JT) and Stirling cryocoolers
- Typical cryogenic operating benchmark for IR focal plane arrays: near 77 K (liquid-nitrogen boiling point) [Unverified — exact operating temperature varies by detector type and is not specified in the source article]
- India's defence exports: at a record high in FY 2025-26, continuing sustained year-on-year growth over the past decade