Tonbo Imaging, an Indian defence technology startup, has raised Rs 175 crore in a pre-IPO round.The funding will be used to develop next-generation infrared sensors and scale the deployment of high-power microwave technologies.Tonbo Imaging combines optics, artificial intelligence, and computer vision to create advanced surveillance and targeting systems for the battlefield.The company's systems are currently operational in over 30 countries and are used by various defense entities worldwide.