How to detect each Windows OS is used with powershell

I would like to check which version of windows is used in a remote machine, I'm using this command:

$version=[Environment]::OSVersion.Version | % {"{0}.{1}.{2}" -f $_.Major,$_.Minor,$_.Build}

I get the result for example windows 7 : 6.1.7600

but I found a problem :

Windows server 2012 R2 have : 6.1.9600

and windows 8.1 too : 6.1.9600

so I'm wondering if there is an other solution to get the version of windows?