I will be interested to hear how well this works in a workshop environment.  From what I have read, most smoke detectors will go off from sawdust in the air so you may find it is too much of a nuisance it if continually gives you false alarms.  A quick search does find some that are supposedly for dusty environments but I have not done any research.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.