... Emerald Group Publishing Limited 2009 Sensors Electromagnetic radiation Lasers Security products Electromagnetic radiation ranging from γ‐rays through to radio waves, is used in a multitude of sensing applications. Likewise, several sectors of the spectrum are used for imaging...

... 2008 X‐rays X‐ray apparatus Security products X‐ray inspection machines are now only too familiar at airport security check‐points, where the radiation penetrates baggage casings and produces shadow images of the contents. The differential absorption of X‐radiation by metals...

... difficult to identify with accuracy. Originality/value Provides the general scientific reader with some insight into the specialised field of biometric recognition. Christine Connolly can be contacted at: ccbrigante@aol.com © Emerald Group Publishing Limited 2006 Security products...

... of objective evaluation results for different types of equipment. © Emerald Group Publishing Limited 2006 Sensors Image processing Security products Identification In 2000, the National Physical Laboratory (NPL) carried out a performance evaluation of various commercial biometric...